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The Growth of Seriatopora hystrix (Dana, 1846) Transplant with Differences of Fragments Size and Planting Position Carissa Paresky Arisagy; Ratih Ida Adharini; Eko Setyobudi
Journal Omni-Akuatika Vol 17, No 1 (2021): Omni-Akuatika May
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2021.17.1.815

Transplantation of coral reefs requires sufficient fragments but must still ensure the sustainability of coral donors. This research aimed to know the survival rate and growth rate of transplant corals with different fragment sizes and planting positions and to determine the most effective and efficient transplantation methods of the Seriatopora hystrix. The research was conducted from January to April 2016 in Serangan Island waters Denpasar Bali (1-2 m depth). The method used was a field experiment with variations of planting position (vertical, horizontal) and fragment sizes (3, 5, 7 cm). The results showed a high survival rate (98.3%) of the transplanted S. hystrix with planting position and fragment sizes variation. The variation of planting position and fragment sizes were significantly affected the length growth rate of the S. hystrix (p <0.05). The vertical planting position showed better growth compared to the horizontal planting position. The transplantation of coral with initial fragment sizes of 5 and 7 cm showed a higher growth rate than the fragment size of 3 cm. However, statistical analysis revealed no significant difference between initial fragment sizes of 5 and 7 cm. Therefore, this study demonstrated the most effective and efficient for S. hystrix transplantation showed in the vertical position with the initial fragment size of 5 cm.Key words: coral bleaching, initial fragment, tropical, zooxanthellae

Assessing the Reliability of Planktic Foraminifera Ba/Ca as a Proxy for Salinity off the Sunda Strait Riza Yuliratno Setiawan; Anindya Wirasatriya; Hasrizal Bin Shaari; Eko Setyobudi; Faizal Rachman
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 22, No 4 (2017): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

The Ba/Ca ratio of planktic foraminifera carbonate serves as a new geochemical proxy for seawater Ba/Ca and thus providing information on modern and past salinity and freshwater discharge. In this study the applicability of Ba/Ca ratio of core-top Globigerinoides sacculifer collected off the eastern tropical Indian Ocean (ETIO) for paleoceanographic reconstructions was investigated. In doing so, we conducted a series of cleaning experiments for Ba/Ca extraction by using different reductive solutions. Our new results suggest that the Ba/Ca ratio of G. sacculifer cannot be utilized as a tracer for modern and past salinity changes in the ETIO region off the Sunda Strait. We suggest that the existence of seasonal upwelling adds an additional signal to the seawater Ba/Ca in the ETIO, and thus complicates the interpretation of G. sacculifer Ba/Ca as a freshwater tracer. Moreover, our cleaning experiment results show that the cleaning protocol of Mg/Ca, DTPA, and hydroxylamine can be used to extract valuable Ba/Ca ratios from planktic foraminifera tests. Keywords: G. sacculifer Ba/Ca, foraminifera cleaning experiments, the Sunda Strait.

Food Preference of Shortfin Scad (Decapterus macrosoma) at the Southern Waters of Gunungkidul Yogyakarta, Indonesia [Preferensi pakan ikan layang deles (Decapterus macrosoma) di Pantai Selatan Gunungkidul Yogyakarta] Friyuanita Lubis; Ratih Ida Adharini; Eko Setyobudi
Jurnal Ilmiah Perikanan dan Kelautan Vol. 11 No. 2 (2019): JURNAL ILMIAH PERIKANAN DAN KELAUTAN
Publisher : Faculty of Fisheries and Marine Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jipk.v11i2.13927

AbstractThe food habit is one of the important information used in the fisheries resource management. This study aimed to determine food preferences, index of preponderance, and trophic level of shortfin scad (D. macrosoma) captured from the southern waters of Gunungkidul Yogyakarta, Indonesia. A total of 325 fish samples were collected from March to September 2018. Each fish sample was measured in total length, body weight, determined its sex, and then dissected. The digestive tract was measured in total length then the gut contents were preserved in 5% formaldehyde to observe the type of food composition. The results showed that shortfin scad was carnivorous fish (relative gut length = 0.47) with the diet composing of fish (84.15%), phytoplankton (8.91%), zooplankton (4.47%), and snipping shrimp (3.19%). The molecular identification showed that the main fish species eaten by shortfin scad was Cololabis saira (Scomberesocoidae).AbstrakKebiasaan pakan ikan merupakan salah satu informasi penting yang digunakan dalam manajemen sumberdaya perikanan. Penelitian ini bertujuan untuk mengetahui preferensi pakan, indeks bagian terbesar dan tingkat trofik ikan layang deles (D. macrosoma) yang ditangkap dari Perairan Gunungkidul. Total 325 sampel ikan layang deles dikumpulkan selama bulan Maret sampai dengan September 2018. Setiap sampel ikan diukur panjang total, berat tubuh, ditentukan jenis kelaminnya kemudian dilakukan pembedahan. Saluran pencernaan diukur panjangnya, kemudian isi lambung ikan diawetkan dalam formalin 5% untuk diamati komposisi jenis makanannya. Analisis data meliputi panjang usus relatif, frekuensi kejadian, indeks bagian terbesar, dan tingkat trofik ikan layang deles. Hasil penelitian menunjukkan bahwa ikan layang deles bersifat karnivora (panjang usus relatif = 0,47) dengan komposisi jenis makanan utama adalah ikan (84,15%). Makanan pelengkap layang deles adalah fitoplankton (8,91%), sedangkan zooplankton (4,47%) dan potongan udang (3,19%) merupakan makanan tambahan. Berdasarkan identifikasi molekuler, spesies ikan yang menjadi makanan utama ikan layang deles adalah Cololabis saira (Scomberesocoidae).

Morphometric and Meristic Characterization of Hairtails Trichiurus lepturus Linnaeus, 1758 (Scombriformes: Trichiuridae) from the Northern Coast of Java, Indonesia Adhimas Febri Aryantojati; Murwatoko Murwantoko; Eko Setyobudi
Jurnal Ilmiah Perikanan dan Kelautan Vol. 14 No. 1 (2022): JURNAL ILMIAH PERIKANAN DAN KELAUTAN
Publisher : Faculty of Fisheries and Marine Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jipk.v14i1.31443

Highlight ResearchThe most significant morphological variation was the snout length and caudal peduncleT. lepturus from the coast of Pati and Cirebon have a high morphometric character resemblance and possibly are members of the same populationT. lepturus in Demak waters formed a separate population group from T. lepturus from the coast of Pati and Cirebon, however still in the same species AbstractHairtails (Trichiurus spp.) are economically important fisheries resources and have become an export commodity. In Indonesia, there are several hairtail species; however, each species distribution is not yet certainly known. This study aimed to identify and determine the morphometric and meristic character of the hairtail from the northern coast of Java, Indonesia. Fish specimens were obtained from fishermen catches in the north coast of Pati and Demak (Central Java) and the northern coast Cirebon (West Java), which captures the fish in less than one-week fishing operation. Fish samples were grouped based on morphological similarities identified in previously published works. After that, 22 morphometric and four meristic characters were measured and counted. Principal Component Analysis and Discriminant Analysis were used to analyze morphometric data, while the meristic data were compared to the available published works. The hairtail caught at the northern coast of Java was long, flat, silvery in color, and had a sagittal crest, with the fin formula being D.III.125-134, P.I.10, and A.I.98-104. According to the morphological and meristic characters, the hairtail caught at Java’s northern coast was identified as Trichiurus lepturus. The most significant morphological variation was the snout length and caudal peduncle. The PCA and scattergram analyses showed that T. lepturus from the coast of Pati and Cirebon have a high morphometric character resemblance and possibly are members of the same population. T. lepturus in Demak waters formed a separate population group from T. lepturus from the coast of Pati and Cirebon, however still in the same species.

HUBUNGAN PANJANG-BERAT DAN NISBAH KELAMIN LOBSTER BATU (Panulirus penicillatus) DI PANTAI SELATAN YOGYAKARTA Rakhma Fitria Larasati; Eko Setyobudi; Suadi Suadi
PELAGICUS Volume 2 Nomor 2 Tahun 2021
Publisher : Politeknik Kelautan dan Perikanan Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/plgc.v2i2.9809

ABSTRAK Lobster (Panulirus spp.) adalah komoditas perikanan penting dan ekonomis tinggi. Spesies yang paling sering dan dominan tertangkap adalah lobster batu. Meningkatnya permintaan lobster menjadikan nelayan melakukan kegiatan penangkapan secara terus menerus. Penelitian ini bertujuan untuk menganalisis hubungan panjang-berat dan rasio jenis kelamin (sex ratio) lobster batu (Panulirus penicillatus). Penelitian dilakukan pada Februari 2017 sampai dengan Agustus 2017 di pantai selatan Yogyakarta. Kajian stok lobster dilakukan melalui survei yang meliputi metode deskriptif, observasi dan wawancara. Pemilihan lokasi pengambilan sampel dilakukan secara terpilih (purposive) yaitu pantai Ngrenehan, Baron, Drini dan Tepus. Total sampel lobster batu yang diperoleh sepanjang penelitian sejumlah 546 ekor, yang terdiri dari lobster jantan 289 ekor (53%) dan lobster betina 257 ekor (47%). Hasil penelitian menyatakan bahwa pola hubungan panjang dan berat lobster batu memiliki sifat allometrik negative dengan persamaan W= 0,004 L 2,577 pada lobster jantan dan W = 0,007 CL 2,481 pada lobster betina. Perbandingan nisbah kelamin lobster batu jantan dan betina adalah 1,12 : 1. ABSTRACTLobster (Panulirus spp.) is an important and economically high fishery commodity. The most frequent and dominant species caught is rock lobster. The increasing demand for lobsters makes fishermen conduct continuous catching activities. The study aims to analyze the relationship of length-weight and sex ratio of rock lobster (Panulirus penicillatus). The research was conducted from February 2017 to August 2017 in southern coast of Yogyakarta. The study of lobster stocks was conducted through surveys that included descriptive methods, observations and interviews. The sampling location was chosen purposively, namely Ngrenehan, Baron, Drini and Tepus. Total samples obtained throughout the study amounted to 546 double-spined rock lobster, consisting of 289 males (53%) and 257 females (47%). The results stated that the length and weight relationship pattern of rock lobsters is negative allometric, with the equation W= 0,004 L 2,577in males lobster and W = 0,007 CL 2,481 in females lobster. The sex ratio double-spined rock lobster between males and females lobster is 1,12 : 1.

Dinamika populasi ikan belanak, Chelon subviridis (Valenciennes, 1836) di muara Sungai Opak - Yogyakarta Djumanto Djumanto; Mike Gustiana; Eko Setyobudi
Jurnal Iktiologi Indonesia Vol 15 No 1 (2015): Februari 2015
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v15i1.72

reenback mullet (Chelon subviridis) is the main species of fish catches in the estuary of Opak River Yogyakarta. The study of the population dynamics becomes important as a basis for fisheries management tools, so that mullet fish stocks can be utilized in a sustainable manner. The purpose of this study was to assess the population parameter of mullet in the area. Fish sampling was done biweekly from the middle of July 2012 to May 2013. Fish catching was done using gillnets wi-th various mesh size. All samples of mullet were collected and sexed, total length was measured using a metal ruler and weighted using digital scales. Length frequency data were analyzed using the software of FiSAT II to estimate the parameters of growth, mortality and recruitment. The results showed that, for the male mullet, VBGF growth parameters, namely L®, K, and to was 29.93 cm, 0.23 and -0.22, respectively. The total mortality, natural mortality and fishing mortality was 1.21, 0.69, and 0.52 per year, respectively, and the exploitation rate was 0.42. In the female, the VBGF growth parameters L ®, K, and to was 37.28 cm, 0.34 and -0.35, respectively. The total mortality, natural mortality and fishing mortality was 1.56, 0.84 and 0.72 per year, respectively, while the exploitation rate was 0.46. Recruitment patterns occur each year with peak spawning was estimated at the beginning and ending of the dry season. Abstrak Ikan belanak (Chelon subviridis) merupakan salah satu jenis ikan tangkapan utama di muara Sungai Opak, Yogyakarta. Kajian dinamika populasi menjadi penting sebagai dasar pengelolaan perikanan agar stok ikan belanak dapat dimanfaatkan secara berkelanjutan. Penelitian ini bertujuan untuk mengkaji parameter populasi ikan belanak di muara sungai tersebut. Pengambilan contoh ikan dilakukan setiap pertengahan bulan dari Juli 2012 hingga Mei 2013. Penangkapan ikan menggunakan jaring insang berbagai bukaan mata jaring. Semua contoh ikan belanak yang tertangkap diidentifikasi jenis kelaminnya melalui pembedahan, diukur panjang total menggunakan mistar logam dan berat individu menggu-nakan timbangan digital. Data frekuensi panjang dianalisis menggunakan perangkat lunak FiSAT II untuk menduga parameter pertumbuhan, mortalitas dan rekrutmen. Hasil penelitian pada belanak jantan menunjukkan parameter pertum-buhan VBGF L®, K, dan to adalah 29,93 cm, 0,23 dan -0,22; mortalitas total 1,21 per tahun, mortalitas alami 0,69 dan mortalitas penangkapan 0,52 per tahun serta tingkat eksploitasi sebesar 0,42. Pada belanak betina diperoleh parameter pertumbuhan VBGF L®, K, dan to adalah 37,28 cm, 0,34 dan -0,35; mortalitas total 1,56 per tahun, mortalitas alami 0,84 dan mortalitas penangkapan 0,72 per tahun serta tingkat eksploitasi sebesar 0,46. Pola rekrutmen terjadi setiap tahun dengan puncak pemijahan diperkirakan pada awal dan akhir musim kemarau.

Kajian dinamika populasi ikan kepek, Mystacoleucus obtusirostris (Valenciennes, in Cuvier & Valenciennes 1842) di Sungai Opak Yogyakarta Djumanto Djumanto; Maria Intan Permata Devi; Ilma Fatimah Yusuf; Eko Setyobudi
Jurnal Iktiologi Indonesia Vol 14 No 2 (2014): Juni 2014
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v14i2.90

The Mystacoleucus obtusirostris is one of the main species of fish caught in Opak River. The study of population dynamics is important as the basis tools for fisheries management in order the stocks of kepek fish can be exploited in a sustainable manner. The purpose of the study was to examine the population parameters of M. obtusirostris inhabitat in the Opak River of Yogyakarta, namely growth and mortality rate, and recrutment pattern. Fish sampling was done by sampling once a week in May-July 2012 and every two weeks in February-April 2013, respectively. Fish sampling was conducted using electrofishing operated by local fishermen. All samples of kepek fish were collected and measured the total length using a metal ruler, and weighted individually using digital scales. Length frequency data were analyzed using the software FiSAT II to estimate parameters of growth, mortality, and recruitment. The results showed the growth parameters of VBGF, namely L<», K, and to was 18.9 cm, 0.75 per year and -0.21, respectively, while the growth performance (0 ') was 2.43. The total mortality was 2.19 per year, natural mortality and fishing mortality was 1.71 and 0.48 per year, respectively, as well as the exploitation rate was 0.21. The spawning was estimated occured in October coincided with the starting of the rainy season, meanwhile the recruitment into fishing ground was occurred monthy starting from Januari with peaking in June year. Abstrak Ikan kepek (Mystacoleucus obtusirostris) merupakan salah satu jenis ikan tangkapan utama di Sungai Opak. Kajian dinamika populasi menjadi sangat penting sebagai dasar pengelolaan perikanan agar stok ikan kepek dapat dimanfaatkan secara berkelanjutan. Penelitian ini bertujuan untuk mengkaji laju pertumbuhan, mortalitas, dan pola rekrutmen ikan ke-pek di Sungai Opak Yogyakarta. Pengambilan contoh ikan dilakukan pada bulan Mei-Juli 2012 dan Februari-April 2013, dengan menggunakan alat kejut yang dioperasikan oleh nelayan setempat. Semua contoh ikan kepek yang ter-tangkap diukur panjang total menggunakan mistar logam dan berat individu menggunakan timbangan digital. Data fre-kuensi panjang dianalisis menggunakan perangkat lunak FiSAT II untuk menduga parameter pertumbuhan dan mortalitas. Hasil penelitian menunjukkan parameter pertumbuhan VBGF L„ (18,9 cm), K (0,75), dan to (-0,21 tahun), sedangkan performa pertumbuhan (0’) adalah 2,43. Mortalitas total 2,19 per tahun, mortalitas alami 1,71 per tahun, mortalitas penangkapan 0,48 per tahun, dan tingkat eksploitasi sebesar 0,21. Pemijahan diperkirakan terjadi pada bulan Ok-tober bertepatan awal musim penghujan, sedangkan rekrutmen ke daerah tangkapan terjadi setiap bulan mulai Januari dengan puncaknya pada Juni saat musim kemarau.

Ichthyofauna distribution in downstream region of Opak River, Yogyakarta [Persebaran iktiofauna di bagian hilir Sungai Opak, Yogyakarta] Djumanto Djumanto; Maria Intan P. Devi; Eko Setyobudi
Jurnal Iktiologi Indonesia Vol 13 No 2 (2013): Desember 2013
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v13i2.97

Opak River, a river upstream on the slopes of Merapi Mount and empties into Indian Ocean, has a diverse aquatic biotic such as fishes. The aim of this study was to determine the species, abundance, and distribution of fishes in the downstream region of Opak River in Yogyakarta. The length of Opak River was approximately 60 km, the length in upper and downstream region around 30 km each. There were five sampling stations, and the station 1 was located in 5 km away from the river mouth, then followed by station 2 until 5, with the distance between stations around of 4-6 km. Fish sampling was conducted every week from May to June 2012 with six replicates, using electrofishing operated by local fishermen. The result showed that there were 2295 individuals of fishes comprising of 7 orders, 23 families, 30 genera, and 35 species. Of them, there were 26 freshwater species, 5 estuarine species, 3 marine species, and 1 catadromous species. Estuarine and marine species could penetrate into freshwater as far as about 10 km and 5 km from the river mouth, respectively. The most abundant family was Cyprinidae, and the highest individual abundance was Barbonymus sp., followed by Puntius binotatus and Rasbora argyrotaenia. The length distribution among fishes ranged between 2.2 and 36.0 cm, with an average of 9.12 cm. The shortest fish was Sicyopterus longifilis, while the longest was Anguilla marmorata. The weight distribution among fishes ranged from 0.07 to 505.0 g, with an average of 14.9 g. Abstrak Sungai Opak yang berhulu di lereng Gunung Merapi dan bermuara di Samudera Hindia, memiliki biota air yang bera-gam jenis, misalnya ikan. Tujuan penelitian ini adalah untuk menyajikan informasi spesies, kelimpahan, dan distribusi ikan di wilayah hilir Sungai Opak di Yogyakarta. Panjang Sungai Opak sekitar 60 km, panjang di wilayah hulu dan hilir masing-masing sekitar 30 km. Pengambilan contoh ditetapkan sebanyak lima stasiun yang dimulai dari muara, yaitu stasiun 1 terletak 5 km dari muara sungai, kemudian diikuti oleh stasiun 2 sampai 5, dengan jarak antar stasiun sekitar 4-6 km . Pengambilan contoh ikan dilakukan setiap minggu dari Mei hingga Juni 2012 dengan enam ulangan, menggu-nakan alat kejut yang dioperasikan oleh nelayan setempat. Hasil penelitian menunjukkan bahwa jumlah ikan hasil tangkapan diperoleh sebanyak 2295 individu yang berasal dari 7 ordo, 23 famili, 30 genera, dan 35 spesies. Berdasar-kan habitatnya, ada sebanyak 26 spesies air tawar, 5 spesies air payau, 3 spesies air asin , dan 1 spesies katadromus. Spesies ikan air payau mampu bergerak masuk ke sungai yang tawar sejauh 10 km dari muara, sedangkan spesies ikan air asin bergerak sejauh 5 km dari muara. Famili yang memiliki kelimpahan spesies paling banyak adalah Cyprinidae dan kelimpahan individu tertinggi adalah Barbonymus sp. kemudian diikuti oleh Puntius binotatus dan Rasbora argyrotaenia. Distribusi panjang ikan berkisar antara 2,2 dan 36,0 cm, dengan rata-rata 9,12 cm. Ikan terpendek adalah Sicyopterus longifilis, sedangkan terpanjang adalah Anguilla marmorata. Distribusi bobot individu ikan berkisar 0,7505,0 g , dengan rata-rata 14,9 g.

Fekunditas ikan gelodok, Boleophthalmus boddarti (Pallas 1770) di Pantai Brebes [Fecundity of Boddart's goggle-eyed goby, Boleophthalmus boddarti (Pallas 1770) in Brebes Coast] Djumanto Djumanto; Eko Setyobudi; Rudiansyah Rudiansyah
Jurnal Iktiologi Indonesia Vol 12 No 1 (2012): Juni 2012
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v12i1.130

Boddart's goggle-eyed goby (Boleopthalmus boddarti) is often found in mudflats of estuary and coastal areas, has ability to walk on land and spawn inside the mud pits of hiding hole. The aim of this research was to study the fecundity and reproductive potential of mudskipper. Sampling was conducted in Losari, Tanjung and Bulakamba sub districts of Brebes regency from February to March 2012. Fish were caught using trap nets of 100 units for each station, then was repeated three times every two weeks. All fish samples were collected and preserved in 10% formaldehyde, then transported to the laboratory for measurement of length, weight, gonad weight, and counting the number and diameter of eggs. The results showed that the smallest size of brood stock was 15.0 cm in length and 30 g in weight. The ratio of male and female showed a balance of 1:1. Fish condition factor tended to decrease when the levels of gonadal maturity increase. The gonad maturity index of the spawned brood stock ranged from 0.8 to 7.9%. The fecundity for each female brood stock ranged from 4,874 to 28,028 eggs with a mean of 14,520 eggs. Relative fecundity ranged from 108 to 577 with a mean of 303 eggs/g body weight. Gonad of mature female consisted of one size group, and egg diameter ranged from 0.38 to 0.55 mm with a mean of 0.47 mm. AbstrakIkan gelodok (Boleopthalmus boddarti) merupakan jenis ikan yang banyak dijumpai di daerah muara dan pantai berlumpur, ikan yang mampu berjalan di darat dan memijah di dalam lubang lumpur tempat persembunyian. Tujuan pe-nelitian adalah untuk menentukan fekunditas ikan gelodok dan mengkaji potensi reproduksinya. Penangkapan ikan di-lakukan di Kecamatan Losari, Tanjung dan Bulakamba, Kabupaten Brebes di antara bulan Februari dan Maret 2012. Penangkapan ikan menggunakan jaring perangkap sebanyak 100 unit tiap stasiun, kemudian diulang sebanyak tiga kali dengan jarak antarwaktu sampling dua minggu. Semua ikan yang terperangkap dikumpulkan kemudian diawetkan dalam formalin 10% dan dibawa ke laboratorium untuk dilakukan pengukuran panjang total dan bobot tubuh, bobot gonad, penghitungan jumlah serta diameter telur. Hasil pengamatan menunjukkan ukuran ikan gelodok matang gonad ter-kecil adalah 15,0 cm dan bobot 30 g. Nisbah kelamin jantan dan betina menunjukkan jumlah yang seimbang 1:1. Faktor kondisi ikan cenderung menurun seiring meningkatnya tingkat kematangan gonad. Indek kematangan gonad pada induk siap pijah berkisar 0,8-7,9%. Fekunditas telur dalam gonad berkisar 4.874-28.028 dengan rerata 14.520 butir. Fekunditas relatif berkisar 108-577 dengan rerata 303 butir butir/g berat induk. Pada induk matang gonad terdapat satu kelom-pok ukuran, dan diameter telur berkisar 0,38-0,55 mm dengan rerata 0,47 mm.

Food and the growth of introduced milkfish, Chanos chanos (Forsskal, 1775) in Sermo Reservoir, Kulon Progo Djumanto Djumanto; Bayu Eko Pranoto; Vinta Seta Diani; Eko Setyobudi
Jurnal Iktiologi Indonesia Vol 17 No 1 (2017): February 2017
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v17i1.306

The purpose of the research was to study feeding preferences and the growth of milkfish introduction into Sermo reservoir Kulon Progo regency. Research was carried out by introduction of milkfish juvenile which body length was ranges of 5-7 cm and weight of 0.6-1.0 g at a number of 10,000 individual fish. Fish sampling using gill nets was conducted monthly from May to October 2015. The captured milkfish brought to the laboratory for some measurements i.e length and weight of an individual fish, intestine length, and gut content investigation. The surface water plankton sample collected by a plankton net, then preserved in formaldehyde, identified and counted the number each plankton species. Data were analyzed to determine relative gut length, food type and feeding preferences, growth rate and length weight relationships. The results showed that relative intestinal length was 5.4 to 6.4, so milkfish categorized as herbivores. Phytoplankton was the only food found in the intestine fish size <14 cm, while zooplankton was found in fish size >15 cm. Zooplankton proportion in digestive tract increased as well as the size of milkfish. The dominant species of phytoplankton found in the digestive tract was Nitzschia sp., whereas zooplankton was Cyclop sp. and Diaptomus sp. The juvenile milkfish growth well in Sermo reservoir. The growth rate of daily length was ranged from 0.0084 to 0.2056 cm, while the growth rate of daily weight ranged from 0.0630 to 1.1182 g. The length weight relationship of milkfish formed an equation W = 0.0069 L 3 0186 with the regression index R2 = 0.98, so the growth of milkfish showed an isometric growth pattern. Further research is needed to determine the impact of the introduction of milkfish to the fish communities in the Sermo reservoir area. Abstrak Tujuan penelitian adalah untuk mengkaji makanan dan pertumbuhan ikan bandeng tebaran di waduk Sermo Kabupaten Kulon Progo. Penelitian dilakukan dengan menebar yuwana ikan bandeng yang panjang tubuh berkisar 5-7 cm dan bo-bot 0,6-1,0 g ke perairan Waduk Sermo sebanyak 10.000 ekor. Sampling ikan bandeng menggunakan jaring insang dilakukan tiap bulan sekali dari Mei sampai Oktober 2015. Ikan bandeng yang terjerat jaring dibawa ke laboratorium untuk diukur panjang, ditimbang bobot individu, dan dilakukan pembedahan untuk diambil saluran pencernaannya. Sampling plankton dilakukan dengan mengambil air permukaan menggunakan ember dan menyaring dengan plankton net, kemudian diawetkan dalam larutan formalin hingga identifikasi dan penghitungan jenisnya. Data dianalisis untuk me-nentukan jenis makanan dan pemilihan makanan, laju pertumbuhan, panjang usus relatif, dan hubungan panjang bobot. Hasil penelitian menunjukkan panjang usus relatif ikan bandeng sebesar 5,4-6,4 yang dikategorikan sebagai ikan herbi-vora. Jenis makanan yang ditemukan pada ikan berukuran <14 cm hanya fitoplankton, sedangkan zooplankton ditemu-kan pada ikan yang berukuran >15 cm. Proporsi zooplankton pada usus ikan semakin banyak seiring ukuran ikan bandeng. Jenis fitoplankton yang ditemukan dominan pada saluran pencernaan adalah Nitzschia sp., sedangkan zooplankton adalah Cyclop sp. dan Diaptomus sp. Yuwana ikan bandeng dapat tumbuh baik di kawasan Waduk Sermo. Laju pertumbuhan panjang harian berkisar 0,0084 - 0,2056 cm, sedangkan laju pertumbuhan bobot harian berkisar 0,06301,1182 g. Hubungan panjang bobot ikan bandeng membentuk persamaan W=0,0069 L 3,0186 dengan indeks regresi R2=0,98, sehingga ikan bandeng cenderung memiliki pola pertumbuhan isometrik. Penelitian lebih lanjut diperlukan untuk mengetahui dampak introduksi ikan bandeng pada komunitas ikan di Waduk Sermo.

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