According to Indonesian Standard Quality, the optimal seed production of orange spotted grouper (Epinephelus coioides)
Keywords: rotifers, feeding time, Orange Spotted grouper larvae, Epinephelus coioides
ABSTRAKProduksi benih ikan kerapu lumpur (Epinephelus coioides) dalam jumlah yang optimal dan kualitas yang sesuai Standar Nasional Indonesia (SNI) masih belum dapat dipenuhi, seiring dengan terjadinya berbagai kendala selama periode pemeliharaan larva. Upaya pemeliharaan larva secara masal telah dilakukan dalam penelitian ini dengan mengoptimalkan pemberian pakan alami (rotifer). Tujuan penelitian adalah untuk mendapatkan informasi lama waktu pemberian pakan alami (rotifer) secara tepat sehingga dihasilkan kelangsungan hidup yang tinggi. Perlakuan berupa pemberian rotifer sampai larva berumur (A) 20 hari, (B) 25 hari, (C) 30 hari, dan (D) 35 hari. Rotifer yang diberikan terlebih dulu diperkaya dengan DHA Selco. Penelitian menggunakan wadah fiber kapasitas 1 m 3 yang diulang 3 kali dan dilaksanakan dengan rancangan acak lengkap (RAL). Pemeliharaan larva dilakukan hingga mencapai fase juvenil (D 45 ). Hasil terbaik dari perlakuan tersebut diterapkan untuk pemeliharaan larva secara masal dengan menggunakan wadah bak beton kapasitas 6m 3 dan 10m 3 . Hasil penelitian menunjukkan bahwa pemberian rotifer hingga larva berumur 25 hari pada wadah fiber (1 m 3 ) menghasilkan sintasan tertinggi sebesar 7,63%, sedangkan pada pemeliharaan secara masal (6 m 3 dan 10 m 3 ) dihasilkan sintasan masing-masing sebesar 4,9±3,54% dan 8,8±2,26%. Tingkat keseragaman ukuran benih cukup tinggi (80%) dan persentase abnormalitas benih relatif rendah (0,4%).
Rendahnya sintasan larva dalam usaha pembenihan kepiting bakau dapat disebabkan oleh terjadinya serangan jamur. Infeksi jamur dapat dicegah dengan adanya pH tinggi pada air media. Penelitian ini bertujuan untuk mengetahui pengaruh peningkatan pH air media terhadap sintasan larva kepiting bakau pada masa-stadia zoea.
Penetitian ini bertujuan untuk mengetahui musim pemijahan abalon. Induk abalondiperoleh dari nelayan di pantai Kuta Lombok Tengah. Variabel yang diamati yaitupanjang cangkang, berat tubuh, panjang gonad, panjang hepetopankreas dan diametertelur.
<p>The milkfish (<span style="text-decoration: underline;">Chanos</span> <span style="text-decoration: underline;">chanos</span> Forsskal) seed quality is an important factor for supporting the fisheries industrialization program . The egg fertility and larval rearing management are two main factors to improve the quality of the seed. The aim of this research was to obtain the information about those two indicators on milkfish larvae, reared in different media. About 100,000 eggs were located in 6 units of the outdoor concrete tank with volume of 6 m<sup>3</sup>. Larvae were reared due to the rearing standard procedure while the feeding management was adapted during larvae development. Two different treatments in larval rearing medium were with and without the addition of molasses, subsequently in triple trials. This study started from hatching day (0 DAH) until the end of larval rearing period (16-18 DAH). The growth parameters such as vertebrae analyses and survival were taken in the end of research periods, while protease assessment was analyzed every day using tyrosine and casein standard methods. The results showed that the molasses addition produced a higher growth (TL 12.95±0.87 mm) and survival rate (87.66±1.52%), better vertebral performance (44-45 segments), and higher protease activity (0.1392-0.3863 U/ml/min) than without molasses addition. The results indicated that molasses addition in larvae rearing medium improved the larvae quality.</p> <p>Keywords: Protease enzime activity,milkfish seeds, molasses, vertebrae</p>
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