Jojo Subagja
Balai Penelitian dan Pengembangan Budidaya Air Tawar

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HUBUNGAN PANJANG DAN BERAT, FAKTOR KONDISI , FEKUNDITAS, DAN PERKEMBANGAN TELUR IKAN TENGADAK (Barbonymus schwanenfeldii) DARI SAROLANGUN, JAMBI DAN ANJONGAN, KALIMANTAN BARAT, INDONESIA Irin Iriana Kusmini; Jojo Subagja; Fera Permata Putri
BERITA BIOLOGI Vol 17, No 2 (2018)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/beritabiologi.v17i2.3017

Abstract

Tinfoil barb (Barbonymus schwanenfeldii) is one of the potential local fish to be cultivated as a food or pet fish. The data and information of the growth pattern of species are essential for fish farming success. The observation on the length and weight relationship is an usefull indicator to determine the pattern of growth fish observed. This study aims to determine the growth patterns of tinfoil barb fish based on length and weight relationship, condition factor and fish fecundity of tinfoil barb from Sarolangun, Jambi and Anjongan, West Kalimantan. The 30 samples were taken randomly from each group. Data were analyzed using analysis regression Microsoft Excel. The result showed that the regression coefficient of length and weight relationship was 2.811 for Sarolangun and 2.686 for Anjongan. The regression value indicates that the the growth of tinfoil barb was allometric negative, with an average factor condition ranged from 0.99 to 1.002. Length and weight relationship had determinant value (R2) ranged from 0.79 to 0.96, with the fecundity ranged from 20168 to 232.040 eggs from 9–45.5g of gonad weight. 
Biometric characterization three population of semah mahseer Tor douronensis (Valenciennes, 1842) in support to conservation of genetic resources Otong Zenal Arifin; Jojo Subagja; Wartono Hadie
Jurnal Iktiologi Indonesia Vol 15 No 2 (2015): June 2015
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v15i2.68

Abstract

Semah mahseer populations are threatened due to the massive exploitation by fishermen, and disrupt the genetic diversity, thus resulting in the disruption of the natural population sustainability. The purpose of this study was to evaluate the genetic diversity semah mahseer from the Alas River, Mount Leuser, South East Aceh. This is the first step to maintaining a source of genetic diversity semah mahseer. Truss morphometric used to analyze the shape of the body that divides the body of the fish into the truss cell and the truss line. The results showed that the character of the three semah mahseer populations has an increasing internal diversity in the population - 1 to population-3 i.e. 62.5 %, 81.0 % and 85.7 % respectively. Population - 1 is a common form of all populations that showed the relationship between populations. Population - 2 received the sharing allele 25.0 % of the population - 1, and retained in the internal population of 81.0 % and 19.0 %, which is a common form of the population 1 and population- 2. Population-3 received the sharing allele 12.5% of the population - 1, and retained in the internal population of 85.7 % and 14.3%, which is a common form of the population-2 and population - 3. In general, genetic diversity increased from population-1 to population-3. Therefore population-3 is a potential candidate to be developed in the cultivation and conservation. Abstrak Ekploitasi berlebih ikan semah oleh para nelayan, merupakan ancaman terhadap populasi dan mengganggu keragaman genetik yang berakibat pada terganggunya kelestarian populasi ikan ini di alam. Penelitian ini bertujuan untuk mengevaluasi keragaman genetik populasi ikan semah yang berasal dari Sungai Alas, Gunung Leuser Aceh Tenggara sebagai upaya awal langkah yang dapat ditempuh untuk mempertahankan sumber keragaman genetik. Metode yang digunakan adalah analisis bentuk tubuh dengan truss morphometric, yang membagi tubuh ikan kedalam truss cell dan truss line. Hasil yang diperoleh menunjukkan bahwa karakter tiga populasi ikan semah dari Sungai Alas memiliki keragaman internal yang semakin meningkat dari populasi-1 hingga populasi-3 secara berturut-turut 62,5%; 81,0%; dan 85,7%. Ke-eratan hubungan antarpopulasi ditunjukkan oleh populasi-1 yang menjadi bentuk umum dari semua populasi. Populasi-2 menerima sharing allele sebesar 25% dari populasi-1 dan dipertahankan dalam populasi internalnya sebesar 81,0% dan 19,0% menjadi bentuk umum (common allele) dari populasi-1 dan populasi-2. Populasi-3 menerima sharing allele dari populasi-1 sebesar 12,5% dan dipertahankan dalam populasi internalnya sebesar 85,7% dan 14,3% menjadi bentuk umum dari populasi-2 dan populasi-3. Secara umum keragaman genetik semakin meningkat dari populasi-1 hingga po-pulasi-3. Dengan demikian populasi-3 dapat digunakan sebagai populasi kandidat untuk dikembangkan dalam budidaya dan konservasi.
PERTUMBUHAN BENIH IKAN BAUNG (Hemibagrus nemurus) HASIL DOMESTIKASI PADA LOKASI DENGAN KETINGGIAN BERBEDA Jojo Subagja; Vitas Atmadi Prakoso; Otong Zenal Arifin; Yanto Suparyanto; Endang Haris Suhud
Media Akuakultur Vol 13, No 2 (2018): (December, 2018)
Publisher : Pusat Riset Perikanan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (444.74 KB) | DOI: 10.15578/ma.13.2.2018.59-65

Abstract

Ikan baung (Hemibagrus nemurus) merupakan salah satu ikan asli yang terdapat di Indonesia. Ikan ini memiliki harga lebih tinggi dibandingkan beberapa jenis ikan lainnya yang telah populer di kalangan konsumen. Saat ini, ikan ini sedang pada program domestikasi dimana informasi mengenai lokasi yang sesuai untuk pemeliharaan ikan baung belum banyak dipelajari. Penelitian ini bertujuan untuk mengevaluasi pertumbuhan benih ikan baung pada dua lokasi pemeliharaan dengan ketinggian yang berbeda. Penelitian dilakukan pada lokasi dengan ketinggian rendah (< 200 m dpl) di daerah Cijengkol dan lokasi dengan ketinggian sedang (200-400 m dpl) di daerah Maleber, Jawa Barat. Benih ikan baung hasil domestikasi (bobot: 21,62 ± 0,57 g) ditebar pada tiga buah jaring masing-masing berukuran 2 m x 2 m x 1 m dengan padat tebar 15 ekor/m3 di kolam berukuran 40 m x 20 m yang terletak pada masing-masing lokasi pengujian. Ikan diberi makan dengan pakan komersial (30% protein) sebanyak 5% biomassa per hari dengan frekuensi pemberian pakan dua kali sehari selama 180 hari masa pemeliharaan. Kualitas air yang diamati meliputi suhu, oksigen terlarut, dan pH. Parameter yang diukur yaitu pertambahan panjang, pertambahan bobot, laju pertumbuhan spesifik, rata-rata pertumbuhan harian, pertambahan biomassa, rasio konversi pakan, dan sintasan. Hasil penelitian menunjukkan bahwa benih ikan baung yang dipelihara pada ketinggian < 200 m dpl menunjukkan pertambahan bobot dan biomassa yang lebih baik (30,93 ± 2,29 g dan 7,44 ± 0,79 kg) dibandingkan jika dipelihara pada ketinggian 200-400 m dpl (22,32 ± 1,26 g dan 5,97 ± 0,65 kg) (P<0,05). Rasio konversi pakan pada ikan baung yang dipelihara pada dataran rendah lebih rendah (2,37) dibandingkan jika dipelihara pada dataran sedang (2,68). Suhu air pada ketinggian < 200 m dpl lebih tinggi dibandingkan pada ketinggian 200-400 m dpl (P<0,05). Benih ikan baung tumbuh lebih optimal jika dipelihara di daerah dataran rendah, karena pada daerah tersebut memiliki suhu lebih tinggi yang dapat memengaruhi laju pertumbuhan.Asian redtail catfish (Hemibagrus nemurus) is one of Indonesia’s native fish species. This species has a higher commercial value compared to some other fish species already popular among consumers. The fish is currently under a domestication program which information regarding the suitable rearing location has yet to be established. This research was aimed to study the growth of Asian redtail catfish fingerlings reared in two different-altitude locations. The evaluate was conducted at low-altitude location (< 200 m above sea level) in Cijengkol area and mid-altitude location (200-400 m above sea level) in Maleber area, West Java. In each location, the fingerlings of domesticated Asian redtail catfish (weight: 21.62 ± 0.57 g) were stocked in three net cages sized 2 m x 2 m x 1 m in a pond (40 m x 20 m) with a stocking density of 15 fish/m3 per net cage. The fingerlings were fed with commercial feed (30% protein) of 5% fish biomass per day with feeding frequency twice a day for the period of 180 days. The water quality parameters observed were temperature, dissolved oxygen, and pH. The measured experimental parameters were length gain, weight gain, specific growth rate, average daily growth, biomass gain, feed conversion ratio, and survival rate. The results showed that the fish reared at <200 m above sea level had better weight and biomass gains (30.93 ± 2.29 g and 7.44 ± 0.79 kg) than that of the fish reared at 200-400 m above sea level (22.32 ± 1.26 g and 5.97 ± 0.65 kg) (P<0.05). The feed conversion ratio of fingerlings reared at the low-altitude location was lower (2.37) than those of the mid-altitude location (2.68).The water temperature at < 200 m above sea level was significantly higher than that of 200-400 m above sea level (P<0.05). The growth of Asian redtail catfish fingerlings is more optimal in lowland areas due to higher water temperature accelerating the fish growth rate.