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Jurnal Iktiologi Indonesia (Indonesian Journal of Ichthyology)
Published by Masyarakat Iktiologi Indonesia
ISSN : 16930339     EISSN : 25798634     DOI : https://doi.org/10.32491
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology
Aims and Scope Aims: Jurnal Iktiologi Indonesia (Indonesian Journal of Ichthyology) aims to publish original research results on fishes (pisces) in fresh, brackish and sea waters including biology, physiology, and ecology, and their application in the fields of fishing, aquaculture, fisheries management, and conservation. Scope: This journal publishes high-quality articles dedicated to all aspects Aquaculture, Fish biodiversity, Fisheries management, Fish diseases, Fishery biotecnology, Moleculer genetics, Fish health management, Fish biodiversity.
Arjuna Subject : Biokimia, Genetika dan Biologi Molekuler - Biokimia, Genetika dan Biologi Molekuler (Lain-Lain)
Articles 11 Documents
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Search results for , issue "Vol 19 No 2 (2019): June 2019" : 11 Documents clear
Trussmorphometric and meristic characters of kelabau fish (Osteochilus melanopleurus Bleeker, 1852) from three populations in Kampar, Siak, and Rokan Rivers, Riau Province Nur Asiah; Sukendi Sukendi; Junianto Junianto; Ayi Yustiati; Windarti Windarti
Jurnal Iktiologi Indonesia Vol 19 No 2 (2019): June 2019
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v19i2.462

Abstract

The purpose of this study was to understand the morphometric and the meristic characters of the kelabau fish from the Siak, Kampar, and Rokan river populations that could be used as an initial step forconservation. A total of 113 kelabau from Kampar River, 58 fish from the Siak River and84 fishfrom the Rokan River was used in this study. Measurement of 21 morphological characters was conducted using a morphometric truss method. The analysis was carried out using a one-way ANOVA and Discriminant Function Analysis ( SPSS software). Meristiccharacteristics were analyzed descriptively for 30 fish per population. Results indicates that among 21 morphometrical characteristics, 19 characters shown a significant different (P <0.05) and 2 characters were not significantly different (P> 0.05). This result indicates that fish population from all sampling areas shown similar characteristics. The discriminant analysis results show that the specific characters of the O. melanopleurus were A5, A2, A6, B1and D4. Scatterplot results indicate that the Rokan River population was separate from the Siak and Kampar River populations, and the morphology of the fish from the Rokan River population was slightly different from those of the Siak and Kampar River population. The meristic characteristics of fish obtained from all sampling areas were relatively similar. Abstrak Penelitian ini bertujuan untuk memperoleh informasi karakter morfometrik dan meristik ikan kelabau dari Sungai Kampar (Desa Pelalawan), Sungai Siak (Desa Kota Garo Kecematan Tapung Hilir), dan Sungai Rokan (Desa Sekapas Dusun Kualu Angau) yang dapat digunakan sebagai langkah awal konservasi. Sebanyak 113 sampel ikan kelabau dari Sungai Kampar, 58 ikan dari Sungai Siak, dan 84 ikan dari Sungai Rokan digunakan dalam penelitian ini. Pengukuran 21 karakter morfologi dengan metode truss morfometrik. Analisis dilakukan dengan Analisis Varian Satu Arah (ANOVA) dan Analisis Fungsi Diskriminan (DFA) dengan perangkat lunak SPSS.. Karakter meristik dianalisis secara deskriptif pada 30 sampel setiap populasi. Hasil uji signifikansi terhadap 21 karakter yang diuji, 19 karakter berbeda nyata (P<0,05) dan 2 karakter yang tidak berbeda nyata (P>0,05), mengindikasikan semua populasi memiliki karakter yang sama. Hasil analisis diskriminan menunjukkan karakter yang menjadi pembeda A5, A2, A6, B1, dan D4. Berdasarkan fungsi persebaran yang mengelompokkan populasi Rokan terpisah dari Siak dan Kampar, dapat disimpulkan bahwa karakter morfometrik populasi ikan kelabau di Sungai Rokan berbeda. Sebaliknya populasi ikan kelabau di Sungai Siak dan Kampar memiliki karakter yang sama. Karakter meristik tiga populasi Sungai Siak, Kampar dan Rokan relatif sama.
Performance of three generations of Asian redtail catfish Hemibagrus nemurus (Valenciennes, 1840) domestication result of nursery phase one Irin Iriana Kusmini; Deni Radona
Jurnal Iktiologi Indonesia Vol 19 No 2 (2019): June 2019
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v19i2.476

Abstract

In order to the success of domestication programs of Asian redtail catfish is necessary to evaluate the level of change in each generation produced. This study aimed to evaluate the performance of growth and survival rate on three populations from each generation spawned of Asian redtail catfish (G-1, G-2 and G-3). The study was conducted experimentally used completely randomized design (CRD) with 3 treatments and 3 replications from May to July 2017. The origin of the post larvae of Asian redtail catfish was the modified seeds from mass spawning of Asian redtail catfish of Cirata population. G-1 was the population resulted from the spawning of the oldest broodstock, G-2 was a population resulted from spawning of the first generation broodstock and G-3 was the resulted from spawning of the second generation broodstock. Spawning process was conducted in the same time. The age of the seeds was one week old after hatching with total length of 0.8-1.0 cm and body weight of 0.0082 ± 0.0001 g. The Asian redtail catfish seeds were reared in the aquarium with dimension of 70 cm 50 cm x 40 cm and equipped with recirculation system. Each aquarium was stocked seed with a density of 2,000 individual 100 L-1 of water. During rearing process (15 days), fish were fed at satiation with frequency of three times per day. Feed was adjusted to mouth opening of larvae. Initially, larvae on 1 to 7 days of rearing process were fed with artemia and after that fed with tubifex. The result showed that the highest growth and survival rate performance (P<0.05) were obtained in Asian redtail catfish seed (G-3) with a value of 1.64 ± 0.02 cm and 53.42 ± 8.86%, respectively. Postlarvae of Asian redtail catfish from third generaton of domesticated (G-3) can increase fish productivity. Abstrak Dalam mendukung keberhasilan program domestikasi ikan baung perlu dilakukan evaluasi tingkat perubahan setiap generasi yang dihasilkan. Penelitian ini bertujuan untuk mengevaluasi performa pertumbuhan dan sintasan tiga populasi hasil pemijahan setiap generasi (G-1, G-2 dan G-3) ikan baung. Penelitian dilakukan pada bulan Mei-Juli 2017. Penelitian dilakukan secara eksperimental dengan menggunakan rancangan acak lengkap tiga perlakuan dan tiga kali ulangan. Pascalarva ikan baung berasal dari hasil pemijahan tiga generasi (G-1, G-2 dan G-3) ikan baung populasi Cirata. G-1 merupakan populasi hasil pemijahan induk tertua (induk pembentuk), G-2 merupakan populasi hasil pemijahan dari induk generasi pertama dan G-3 merupakan populasi hasil pemijahan dari induk generasi kedua. Proses pemijahan dilakukan dalam waktu yang sama. Pascalarva ikan baung yang digunakan berumur satu minggu setelah penetasan, berukuran panjang 0,8-1,0 cm dan bobot rata-rata 0,0082 ± 0,0001 g. Pascalarva ikan baung dipelihara pada akuarium berukuran 70 cm x 50 cm x 40 cm dan dilengkapi sistem resirkulasi. Setiap akuarium ditebar pascalarva dengan kepadatan 2000 ekor/100 L air. Selama 15 hari pemeliharaan, pascalarva ikan baung diberi pakan sekenyang-kenyangnya dengan frekuensi tiga kali sehari. Pakan yang diberikan disesuaikan dengan bukaan mulut pascalarva ikan baung, pada 1-7 hari pemeliharaan diberi pakan berupa artemia dan selanjutnya diberi pakan berupa cacing tubifex. Hasil penelitian menunjukkan bahwa performa pertumbuhan panjang dan sintasan tertinggi (P<0,05) diperoleh pada pascalarva ikan baung G-3 dengan nilai 1,64 ± 0,02 cm dan 53,42 ± 8,86%. Pascalarva ikan baung G-3 hasil domestikasi mampu meningkatkan nilai produktivitas.
Maintenance of local snakehead postlarva Channa sp. on different containers in domestication framework Fazril Saputra; Mahendra Mahendra
Jurnal Iktiologi Indonesia Vol 19 No 2 (2019): June 2019
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v19i2.477

Abstract

Provision of local snakehead fish supply (Channa sp.) is come from nature. If demand for local snakehead fish increases then the exploitation rate of this fish in nature will be excessive. It will cause the fish population in nature to decline. Domestication is an effort to prevent the delining of fish population. The aim of this study was to ensure that snakehead from the Arongan Lambalek Area, West Aceh Regency can survive, grow and develop in various cultivation containers, therefore can be cultivated by local communities. This study used an experimental method with a completely randomized design with three treatments of cultivation containers and three replications. The treatment was an aquarium container (P1), fiber container (P2), and tarpaulin container (P3). The size of snakehead fish used in this study had an average length of 2.72 cm and weight of 0.17 g. The results showed that the survival rate and the highest weighting value were found in the aquarium container treatment (P1), while the growth of fish length was found in the fiber (P2) . This study showed that domestication of the local snakehead fish in Arongan Lambalek, West Aceh was successfully carried out and the aquarium is the best container for rearing the domesticated local snakehead fish larvae. Abstrak Penyediaan pasokan ikan gabus lokal (Channa sp.) selama ini berasal dari alam. Jika pemintaan ikan gabus lokal me-ningkat maka laju eksploitasi ikan gabus lokal di alam akan berlebih yang pada akhirnya dapat menyebabkan popula-sinya semakin berkurang. Domestikasi merupakan upaya untuk mencegah terjadinya hal tersebut. Penelitian ini bertu-juan agar pascalarva ikan gabus lokal dari daerah Arongan Lambalek, Kabupaten Aceh Barat dapat tetap hidup, dapat tumbuh dan berkembang dalam berbagai wadah budi daya sehingga dapat dibudidayakan oleh masyarakat sekitar. Penelitian ini menggunakan metode eksperimental. Rancangan percobaan yang digunakan adalah rancangan acak lengkap dengan tiga perlakuan wadah budi daya dan masing-masing diulang sebanyak tiga ulangan. Perlakuan tersebut adalah wadah akuarium (P1), wadah fiber (P2), dan wadah terpal (P3). Ukuran ikan gabus yang digu-nakan pada penelitian memiliki rata-rata panjang 2,72 cm dan bobot 0,17 gram. Hasil penelitian menunjukkan bahwa nilai sintasan dan nilai pertambahan bobot tertinggi terdapat pada perlakuan wadah akuarium, sementara pertambahan panjang tertinggi terdapat pada wadah fiber. Hasil penelitian menampilkan bahwa bahwa domestikasi pascalarva ikan gabus lokal Arongan Lambalek, Aceh Barat berhasil dilakukan dan wadah akuarium merupakan wadah terbaik untuk memelihara pascalarva ikan gabus hasil domestikasi.
Effectivity of Streptococcus agalactiae bacterial vaccine with different coatings for increasing the immunity system on nile tilapia Oreochromis niloticus (Linnaeus, 1758) Ricko Reynalta; Munti Yuhana; Angela Mariana Lusiastuti
Jurnal Iktiologi Indonesia Vol 19 No 2 (2019): June 2019
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v19i2.478

Abstract

Vaccination is one of the most effective control measure in preventing Streptococcus agalactiae infection. In this study, vaccine coatings were prepared with certain biomaterials such as chitosan, skim milk, and maltodextrin at concentration 1 % or 10 %, and further freeze-dried. Vaccine selected (in vitro) by tests: viability cell, solubility, protein concentration and protein molecular weight. The result of in vitro test showed that chitosan coating at doses 1 % and 10 % were the best in solubility and protein concentration test. Vaccine coated with chitosan was administrated again by injection (in vivo) in nile tilapia (Oreochromis niloticus) before challenged by S. agalactiae. This test consists of six treatments and three replications, i.e. the fish were injected with liquid vaccine (A), Phospat Buffered Saline (PBS) (B), vaccine with chitosan coating 1 % (C), vaccine with chitosan coating 10 % (D), chitosan 1 % (E), and chitosan 10 % (F). Parameters were observed including survival rate, relative percent survival (RPS), antibody titre, and total leucocyte. The results showed that treatment C showed a significant difference (P < 0,05) in survival rate 92.22 ± 3.85 %, RPS 85.21 ± 7.20 %, and antibody titre highest result, but not significant (P > 0,05) to increase total leukocyte in experimental fish against S. agalactiae infection. In conclusion, vaccine freeze dry with chitosan coated 1 % is effective to improve immunity system of nile tilapia. Abstrak Vaksinasi merupakan salah satu tindakan paling efektif dalam pencegahan infeksi Streptococcus agalactiae. Pada penelitian ini, vaksin disalut dengan bahan biomaterial (kitosan, susu skim, dan maltodekstrin) dengan dosis 1% atau 10%, dan dikeringbekukan. Seleksi vaksin dilakukan secara in vitro dengan melihat uji viabilitas sel, kelarutan, kon-sentrasi protein, dan berat molekul protein. Hasil seleksi menunjukkan bahwa vaksin dengan penyalut kitosan 1% dan 10% berada pada urutan kedua terbaik pada uji kelarutan dan konsentrasi protein. Vaksin yang disalut kitosan diuji-kan kembali secara in vivo melalui injeksi pada ikan nila (Oreochromis niloticus) sebelum diuji tantang dengan bakte-ri S. agalactiae. Uji (in vivo) terdiri atas enam perlakuan dan tiga ulangan yakni perlakuan ikan diinjeksi dengan vaksin cair (A), Phosphat Buffered Saline (PBS) (B), vaksin yang disalut kitosan 1% (C), vaksin yang disalut kitosan 10% (D), kitosan 1% (E), dan kitosan 10% (F). Parameter yang diamati meliputi nilai sintasan, relative percent survival (RPS), titer antibodi, dan total leukosit. Hasil penelitian perlakuan C menunjukkan hasil berbeda nyata (P < 0,05) dengan nilai sintasan 92,22 ± 3,85%, RPS 85,21 ± 7,20%, dan titer antibodi C juga menunjukkan hasil paling tinggi, tetapi tidak berbeda nyata (P > 0,05) untuk meningkatkan jumlah leukosit dalam percobaan melawan infeksi bakteri S. agalactiae. Dengan demikian, vaksin kering beku yang disalut kitosan 1% efektif untuk meningkatkan kinerja imunitas ikan nila.
Supplementation of corn oil Ω-6 fatty acids in feed for reproduction performance of threadfin rainbowfish Iriatherina werneri Meinken, 1974 Rahmadani Rahmadani; Mia Setiawati; Dinar Tri Soelistyowati
Jurnal Iktiologi Indonesia Vol 19 No 2 (2019): June 2019
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v19i2.479

Abstract

Rainbow fish (Iriatherina werneri) is a type of partial spawner fish with the little number of eggs production. The high contain of essential fatty acid (Linoleic acid 18:2 Ω-6) in corn oil was widely used as a source of fatty acid in the broodstock feed. The aim of this study was to evaluate the additional of LA fatty acid in feed for reproduction performance of rainbow fish. This study used a complete random design consists of three treatments and six replicates with different doses of corn oil LA in feed, Ω-6 0%, Ω-6 1%, and Ω-6 2%. Rainbow fish broodstock as sampel test with body weight 0.10-0.18g for females 0.21 ± 0.001 g, were kept separately in each tanks (size 30 cm x 30 cm x 30 cm) with density 15 fish per tanks. Broodstock were given diet three times daily at 08:00 am, 12:00 am and 17:00 pm by at satiation. The trial feed was administrated for 30 days before conducted the mass spawning for seven days with ratio of the male and female broodstock was 1:3. The results showed that treatment without supplementation of Ω-6 corn oil performed highest number of eggs 290 ± 125, hatching rate 55,99 ± 14,80%, survival rate 8,43% and the proportion of vitellogenic cell was more dominant, but the best of larval performance was observed in tretament of Ω-6 1% of highest larval length 3.00 mm and 100% percentage of normal larvae. It can be concluded that the supplementation of 1 % the Ω-6 fatty acid corn oil in the feed to produce reproductive performance was supported by the results of the histology of the eggs and larvae of the best performance in rainbowfish. Abstrak Ikan pelangi (Iriatherina werneri) tergolong jenis ikan pemijah bertahap dengan jumlah telur yang dihasilkan relatif sedikit. Kandungan asam lemak esensial linoleat (18:2Ω-6) yang tinggi dalam minyak jagung banyak digunakan sebagai sumber asam lemak pada pakan induk. Penelitian ini bertujuan untuk mengevaluasi penambahan asam lemak linoleat Ω-6 minyak jagung dalam pakan terhadap kinerja reproduksi ikan pelangi. Penelitian menggunakan rancang-an acak lengkap yang terdiri atas tiga perlakuan dan tiga ulangan yaitu dosis penambahan asam lemak Ω-6 minyak jagung dalam pakan n-6 0%, n-6 1% dan n-6 2%. Ikan uji yang digunakan adalah induk ikan pelangi betina dengan kisaran bobot 0,10-0,18 g dan induk jantan 0,21±0,001g, dipelihara secara terpisah di akuarium berukuran 30 cm x 30 cm x 30 cm dengan padat tebar 15 ekor per akuarium. Ikan diberi pakan uji dengan frekuensi tiga kali dalam sehari yaitu pada pukul 08.00, 12.00 dan 17.00 secara at satiation. Pakan perlakuan diberikan selama 30 hari kemudian dilakukan pemijahan secara massal selama tujuh hari dengan perbandingan induk jantan dan betina 1:3. Hasil pene-litian menunjukkan bahwa perlakuan tanpa penambahan Ω-6 minyak jagung menghasilkan jumlah telur 290±125 butir, derajat penetasan telur 55,99±14,80%, sintasan 8,43% tertinggi serta proporsi vitellogenic cell yang lebih dominan, namun performa larva terbaik diperoleh pada perlakuan Ω-6 1% dari panjang larva tertinggi 3,00 mm dan persentasi larva normal 100%. Disimpulkan bahwa penambahan 1% asam lemak Ω-6 minyak jagung dalam pakan menghasilkan performa reproduksi yang didukung oleh hasil histologi telur serta performa larva yang terbaik pada ikan pelangi.
Length weight relationship, growth parameter, and condition factor of caroun croaker Johnius carouna (Cuvier, 1830) in the Southern waters of Java Ria Faizah; Regi Fiji Anggawangsa
Jurnal Iktiologi Indonesia Vol 19 No 2 (2019): June 2019
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v19i2.480

Abstract

Caroun croaker (Johnius carouna) is one of demersal fishes which are commonly caught in the south of Java waters. This fish captured by trammel net, gillnet, danish seine and mini trawl. This study aims to determine length and weight relationship, growth parameter, length frequency distribution and condition factors of croaker fish caught in the south of Java waters. This study was conducted from January-December 2015 at the Cilacap Ocean Fisheries Port, Central Java. Data collected was total length (TL in mm) and weight (W in g) of caroun croacker fish. A total of 2141 of Caroun croaker was caught by mini trawl during the sampling periods. The result showed that the size of croaker fish caught by mini trawl ranged between 85-225 mm with an average was 143.7 mm. Length and weight relationship expressed by equation of W = 0.0062 TL3.2889 ( R2 = 0.9443). The growth pattern of croaker fish was allometric positive. The Von Bertalanffy growth equation of caroun croacker fish in south of Java waters was Lt =155 (1 - e -0.9(t+0.2127)) with the asymptotic length (L∞) =155 mm, growth coefficient (K) = 0.9 per year and the theoretical age croaker fish that was equal to (t0) = - 0,2127. Abstrak Ikan gulamah (Johnius carouna.) merupakan ikan demersal yang banyak tertangkap di Perairan Selatan Jawa. Ikan ini tertangkap oleh jaring trammel net, payang, gillnet, dan arad. Penelitian ini bertujuan untuk menentukan hubungan panjang bobot, parameter pertumbuhan, faktor kondisi, dan sebaran ukuran panjang ikan gulamah yang tertangkap di Perairan Selatan Jawa. Penelitian ini dilakukan di Pelabuhan Perikanan Samudera Cilacap, Jawa Tengah pada bulan Januari-Desember 2015. Data yang dikumpulkan adalah data panjang dan bobot ikan gulamah. Sejumlah 2141 ekor ikan gulamah yang tertangkap jaring arad telah diamati selama periode sampling. Hasil penelitian menunjukkan bah-wa ukuran panjang total (TL) ikan gulamah yang tertangkap jaring arad berkisar 85-225 mm dengan panjang rata-rata 143,7 mm. Hubungan panjang dan bobot mengikuti persamaan W=0,0062 TL 3,2889 (R2= 0,9443). Ikan gulamah memiliki pola pertumbuhan allometrik positif. Persamaan kurva pertumbuhan Von Bertalanffy ikan gulamah di per-airan selatan Jawa yaitu Lt =155 (1 - e -0,9(t+0,2127)) dengan panjang asimtotik (L∞) =155 mm, koefisien pertumbuhan (K) = 0,9 per tahun dengan umur teoritis (t0) = - 0,2127.
Growth of stunted elver of the Indonesian shortfin eel Anguilla bicolor McClelland, 1844 rearing in semi-natural media Latifa Fekri; Ridwan Affandi; M. F. Rahardjo; Tatag Budiardi; Charles P. H. Simanjuntak
Jurnal Iktiologi Indonesia Vol 19 No 2 (2019): June 2019
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v19i2.481

Abstract

This study aimed to evaluate the growth of stunted elver Anguilla bicolor from three different periods of stunting process. Prior to experiment, the stunting process of elver was carried out by limiting the feeding rate at 2% of the fish biomass and temperature media with 24 oC for 2, 4, and 6 months period. The study used a completely randomized design with three different sources of stunted elvers (i.e., A = 2 months; B = 4 months; C = 6 months) as treatments with three replications. Measurement of RNA:DNA ratio, protein content, profile blood description and elver otolith growth was carried out at the beginning and end of rearing process. Post-stunting elvers were reared on artificial media designed according to elver habitat and controlled. Elver was stocked with 15 individuals in the artificial semi-natural media with a temperature of 28 oC and fed with 1 kg media-1 day-1 tubifex worm for three months. The results showed that the compensatory growth of stunted elvers increased two to three times with 100% of survival rate after three months of rearing process. Stunting has a significant effect on treatment B, indicated by the value of weight specific growth rates, RNA : DNA ratio, protein content, blood glucose levels and otolith growth of elvers. This study revealed that the growth performance of stunted elver reared in semi-natural media for four months is better than other treatments. Abstrak Penelitian ini bertujuan untuk mengevaluasi pertumbuhan elver Anguilla bicolor pascapembantutan dari tiga periode pembantutan yang berbeda. Proses pembantutan yang dilakukan sebelumnya dengan membatasi jumlah pemberian pakan sebanyak 2% dari biomassa dan pengaturan suhu media pemeliharaan 24 oC selama 2, 4, dan 6 bulan. Peneli-tian ini menggunakan rancangan acak lengkap dengan tiga perlakuan masa pembantutan yang berbeda (yaitu A = 2 bulan; B = 4 bulan; C = 6 bulan) dan masing-masing tiga ulangan. Pengukuran nisbah RNA:DNA, kandungan protein, gambaran profil darah dan pertumbuhan otolit elver dilakukan pada awal dan akhir pemeliharaan. Elver pascapembantutan dipelihara pada media buatan yang dirancang sesuai dengan habitat alami elver dan terkontrol. Elver ditebar 15 ekor per sekat pada media buatan semi alami dengan suhu 28 oC dan diberi pakan sebanyak 1 kg cacing sutera per media per hari selama tiga bulan pemeliharaan. Hasil penelitian menunjukkan bahwa pertumbuhan kompensasi elver pascapembantutan meningkat dua hingga tiga kali dengan sintasan 100% setelah pemeliharaan tiga bulan. Pembantutan memberikan pengaruh yang signifikan pada perlakuan B, ditunjukkan oleh nilai laju pertumbuh-an spesifik bobot, nisbah RNA:DNA, kandungan protein, kadar glukosa darah dan pertumbuhan otolit. Penelitian ini menunjukkan bahwa keragaan pertumbuhan elver pascapembantutan empat bulan yang dipelihara di media semi alami lebih baik daripada perlakuan lainnya.
Masculinization of featherfin squeaker Synodontis eupterus Boulenger, 1901 larvae using javanese long pepper extract Piper retrofractum and increased rearing temperature Euis Rakhmawati; Muhammad Zairin Jr; Dinar Tri Soelistyowati
Jurnal Iktiologi Indonesia Vol 19 No 2 (2019): June 2019
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v19i2.482

Abstract

Javanese long pepper (Piper retrofractum) is known to have androgenic effect, could act as phytosteroid and alternative to masculinization. This research aimed to evaluate the optimum dose of the Javanese long pepper extracts combined with increased rearing temperature on featherfin squeaker masculinization through larva immersion. This research was designed using a completely randomized design with 8 treatments consisted of Javanese long pepper extract doses of 0.0625 mg L-1and 0.125 mg L-1, negative control (without both extract and 17α-metiltestosterone) and positive control (2 mg L-117α-metiltestosterone). Each of them consisted of two different temperature treatments, namely, normal (26-27ᴼC) and 32ᴼC. After five hours treatment, larvae were reared until five months age. The fish age four and then five months were dissected and their gonads were taken for acetocarmine and histology preparation. Beside that the percentage of fish survival, body length, weight gain, and specific growth rate were also recorded in certain period. The result showed that the Javanese long pepper extract dose at 0.125 mg L-1 with normal temperature treatment produced the highest male ratio and significantly different compare with control. Giving this dose to larvae did not affect fish survival and growth, meanwhile increased temperature treatment could not increase the effectivity of Javanese long pepper extract. Abstrak Cabe Jawa dikenal memiliki efek androgenik, yang dapat berperan sebagai fitosteroid dan menjadi alternatif untuk penjantanan. Penelitian ini bertujuan mengevaluasi dosis optimum ekstrak Piper retrofractum yang dikombinasikan dengan peningkatan suhu terhadap penjantanan sinodontis melalui perendaman larva. Peningkatan suhu pemeliharaan dilakukan guna meningkatkan efektivitas dari perlakuan. Penelitian didesain menggunakan rancangan acak lengkap dengan 8 perlakuan terdiri atas perlakuan ekstrak cabe Jawa dosis 0,0625 mg L-1 dan 0,125 mg L-1, kontrol negatif (tanpa ekstrak dan 17α-metiltestosteron) serta kontrol positif (2 mg L-117α-metiltestosteron). Tiap perlakuan terdiri atas dua perlakuan suhu normal (26-27⁰C) dan suhu yang ditingkatkan (32ᴼC). Setelah perendaman lima jam, larva dipelihara sampai berumur lima bulan. Ikan umur empat dan lima bulan dibedah lalu gonadnya diambil untuk pem-buatan preparat histologis dan asetokarmin. Selain itu persentase sintasan, panjang, bobot, dan laju pertumbuhan harian juga dicatat pada periode tertentu. Hasil penelitian menunjukkan bahwa pemberian ekstrak cabe Jawa dosis 0,125 mg L-1 dalam suhu normal menghasilkan nisbah jantan tertinggi dan berbeda signifikan dengan kontrol. Pem-berian dosis ini tidak memberikan efek negatif terhadap sintasan kan dan pertumbuhan, sedangkan peningkatan suhu tidak dapat meningkatkan efektivitas ekstrak cabe Jawa.
The effect of supplementation of Lumbricus sp. extract in fermented foods for growth performance, body chemical composition, and hepatosomatic index of milkfish, Chanos chanos Forsskal, 1775 Siti Aslamyah; Zainuddin Zainuddin; Badraeni Badraeni
Jurnal Iktiologi Indonesia Vol 19 No 2 (2019): June 2019
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v19i2.483

Abstract

The quality of feed can be improved by fermenting feedstuffs and supplementing with feed additives. This study aims to determine the effect of supplementation of Lumbricus sp. extract in fermented feed on growth performance, body chemical composition, and milkfish hepatosomatic index. Milkfish with an initial weight of 17.80 ± 0.20 g head-1, rearing with a density of 20 fish per hapa net measuring 1 m3 by 24 pieces. Hapa net is installed in a pond with a water level of ± 60 cm. Research was design in completely randomized design with two factors. The first-factor was supplementation method, namely Lumbricus sp. which sprayed on feed and mixed with feed ingredients. The second factor was the dose of Lumbricus sp. extract, namely 0, 100, 200 and 300 mL kg-1 of feedstuffs. The fish was reared for 50 days and fed with 5% of fish biomass per day with feeding frequency of 3 times i.e., morning, afternoon and evening. The results showed that the supplementation Lumbricus sp. extract has no significant effect on all parameters (P>0,05). However, the level dose of Lumbricus sp. extract supplementation in feed has a significantly effect (P<0.05) on absolute growth, relative growth, feed efficiency, and hepatosomatic index, but no significant effect (P>0,05) on survival and chemical composition of milkfish body. The best best of absolute growth (16.94±4.0 g), relative growth (48.71±5.77%), feed efficiency (40.74±10.3 %), and hepatosomatic index (1.5 ± 0.17) were found in the experiment of supplementation Lumbricus sp. extract mixed with feedstuffs at a dose of 300 mL kg1. The survival rate of milkfish was ranging from 68.33±29.3 to 91.,33±7.64%, while the body's chemical composition including protein levels, fat, ash, crude fiber, NFE / Nitrogen Free Extract, liver glycogen and muscle glycogen were 69.45±1.23 – 71.45±0.97%, 14.86±0.46 – 17.24±0.76%, 9.28±0.12 – 11.12±0.46%, 1.54±0.09 – 1.66 ± 0.13%, 1.33± 0.42 – 2.71±0.21%, 7,11±0,08 – 7,40±0,17mg g-1 and 6,13±0,44 – 6,45±0,40 mg g-1, respectively. Abstrak Kualitas pakan dapat ditingkatkan dengan memfermentasi bahan baku pakan dan suplementasi dengan aditif pakan. Penelitian ini bertujuan untuk mengkaji pengaruh suplementasi ekstrak Lumbricus sp. dalam pakan fermentasi terhadap kinerja pertumbuhan, komposisi kimiawi tubuh, dan indeks hepatosomatik ikan bandeng. Ikan bandeng dengan bobot awal 17,80±0,20 g ekor-1, dipelihara dengan kepadatan 20 ekor per hapa berukuran 1 m3 sebanyak 24 buah. Hapa dipasang di tambak dengan ketinggian air ± 60 cm. Penelitian didesain dengan rancangan acak lengkap dua faktorial. Faktor pertama adalah metode suplementasi, yaitu ekstrak Lumbricus sp. disemprot pada pakan dan dicampur dengan bahan baku pakan; sementarara faktor kedua adalah dosis ekstrak Lumbricus sp., yaitu 0, 100, 200, dan 300 mL kg-1 bahan baku pakan. Selama 50 hari pemeliharaan diberi pakan 5% bobot badan per hari dengan frekuensi tiga kali sehari yakni pagi, siang, dan sore. Hasil penelitian menunjukkan bahwa suplementasi tidak berpengaruh nyata (P>0,05) pada semua parameter. Namun, dosis suplementasi ekstrak Lumbricus sp. dalam pakan berpengaruh nyata (P<0,05) terhadap pertumbuhan mutlak, pertumbuhan relatif, efisiensi pakan, indeks hepatosomatik, tetapi tidak berpengaruh nyata (P>0,05) terhadap sintasan dan komposisi kimiawi tubuh ikan bandeng. Pertumbuhan mutlak (16,94±4,0 g), pertumbuhan relatif (48,71±5,77%), efisiensi pakan (40,74±10,37%), dan indeks hepatosomatik (1,50±0,17) terbaik ditemukan pada metode suplementasi ekstrak Lumbricus sp. yang dicampur dengan bahan baku pakan dengan dosis 300 mL/kg. Sintasan berkisar antara 68,33±29,3 - 91,33±7,64%, sedangkan kisaran komposisi kimiawi tubuh meliputi kadar protein (69,45±1,23 - 71,45±0,97%), lemak (14,86±0,46 - 17,24±0,76%), abu 9,28±0,12 - 11,12±0,46%), serat kasar (1,54±0,09 - 1,66±0,13%), BETN/Ba-han Ekstrak Tanpa Nitrogen (1,33±0,42 - 2,71±0,21%), glikogen hati (7,11±0,08 - 7,40±0,17 mg g-1) dan glikogen otot (6,13±0,44 - 6,45±0,40 mg g-1).
Morphologies description of Halmahera epaulette shark endemic species (Hemiscyllium halmahera, Allen & Erdmann, 2013) in North Maluku Sea Nebuchadnezzar Akbar; Irmalita Tahir; Abdurrachman Baksir; Rustam E Paembonan; Firdaut Ismail
Jurnal Iktiologi Indonesia Vol 19 No 2 (2019): June 2019
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v19i2.494

Abstract

Halmahera Epaulette Shark (Hemiscyllium halmahera) is an endemic fish in the North Maluku sea. This species was first discovered in two spots of Halmahera waters namely Ternate and Bacan in 2013. Halmahera Epaulette Shark research was continue in Weda and Kao Bay in 2016, 2017 and 2018. Those previous studies, however, did not reveal the morphological description of this species in the other part of the Halmahera Islands. This research was made to enhance the information about this species from the other part of Halmahera waters with a purpose to describe the morphology of Halmahera epaulette shark. The study was carried out in remote areas of Loleo, Tidore, Maitara, Mare, and Lelei Island in 2018. Photos of fish were documented, some meristic and morphometric characters and body weigt were measured. Halmahera epaulette shark has many local names. Observation results showed that many dark brown spots with different patterns and shapes were present with 0.5-1.2 cm in diameter. The total and standard lengths were 40-63 cm and 35-55 cm, respectively. Head length and head width ranged from 7-12 cm and 3-6 cm, respectively. The head height ranged from 9-10 cm. The body circumference of fish ranged between 11-24 cm. Pectoral fins length ranged from 4-6 cm. The dorsal fin length ranged from 5-6 cm. The lower tail length ranged from 4-6 cm. The upper tail length ranged from 4-6 cm. Fish mouth type is subterminal with pointed teeth. Abstrak Hiu berjalan Halmahera (Hemiscyllium halmahera) merupakan biota laut endemik yang terdapat di perairan laut Maluku Utara. Spesies ini pertama kali ditemukan pada tahun 2013 di dua titik di perairan Halmahera yakni Ternate dan Bacan. Penelitian dilanjutkan pada tahun 2016, 2017 dan 2018 di perairan Halmahera yakni Weda dan Teluk Kao. Penelitian tersebut belum mengungkapkan secara lengkap deskripsi morfologis ikan tersebut pada wilayah perairan di Pulau Halmahera lainnya. Tujuan penelitian ini untuk memperoleh data deskripsi morfologis hiu berjalan halmahera. Penelitian ini, dijadikan sebagai data tambahan dari hasil penelitian sebelumnya. Upaya koleksi hiu berjalan dilakukan pada bulan Januari-November tahun 2018 di wilayah perairan Loleo, Tidore, Maitara, Mare dan Lelei. Sampel yang diperoleh difoto, beberapa karakter meristrik, morfometrik, dan bobot tubuh ikan diukur. Ikan ini memiliki banyak nama lokal yang berbeda. Hasil pengamatan menunjukkan bahwa spesies ini memiliki banyak bintik berwarna coklat tua dengan pola ukuran dan bentuk yang berbeda-beda dengan ukuran diameter antara 0,5-1,2 cm. Panjang total tubuh dan panjang standar berkisar antara 40-63 cm dan 35-55 cm. Panjang kepala 7-12 cm; lebar kepala 3-6 cm; tinggi kepala 9-10 cm; lingkar tubuh 11-24 cm. Panjang sirip pektoral 4-6 cm; Panjang sirip dorsal 5-6 cm; panjang ekor bagian bawah 4-6 cm. Panjang ekor bagian atas antara 4-6 cm. Tipe mulut subterminal dengan gigi yang runcing.

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