Dietary protein requirement of giant mud crabScylla serratajuveniles fed iso-energetic formulated diets having graded protein levels

Abstract

The protein requirement of juvenile mud crab Scylla serrata (body weight 5 0.25 AE 0.051g, carapace width 5 9.3 AE 0.04 mm) fed with di¡erent iso-energetic, iso-lipidic diets with graded protein levels (155 5% crude protein at 5% intervals) was determined. The feeding trial was conducted for a period of 63 days to determine the minimum and optimum protein requirement of juvenile S. serrata. The crabs fed with 15% and 20% dietary protein levels showed 100% and 12.5% of mortalities respectively. The mortalities observed in the above treatments were associated with the prolonged intermoult duration (46 and 32 days respectively). All other treatments recorded 100% survival. The best growth performance as well as the nutrient turn-over was recorded in crabs fed with 45% crude protein in the diet. Second-order polynomial regression of speci¢c growth rate (SGR) as well as body protein gain vs. dietary protein levels suggested that 46.9^47.03% dietary protein is required for the best growth response and protein deposition in juvenile S. serrata. An extrapolation of 'SGR' and 'daily protein gain' upon the 'dietary protein level' axis (Y 5 0) showed that 14.71 6.2% dietary protein is necessary for the minimum maintenance metabolism.

Optimization of stocking density in intensification of mud crab Scylla serrata cultivation in the resirculation system

“…The ammonia concentration in the water is known to infulence the osmoregulation process of crustaceans through the gills and an exposure to high ammonia levels can result in an increment in Na+/K+ -ATPase activity in the gill (Romano & Zeng, 2011). Ammonia accumulation in the hemolymph can affect metabolic processes such as oxygen transport and osmotic pressure balance (Unnikrishnan & Paulraj, 2010). The oxygen availability at an optimum level, in both rearing containers and filter, increased the success rate of nitrifying bacteria in degrading waste (Schreier et al, 2010).…”

PENGARUH KADAR TRIPTOPAN PAKAN TERHADAP PERTUMBUHAN DAN SINTASAN KRABLET KEPITING BAKAU, Scylla serrata SELAMA MASA PENDEDERAN

“…Pakan dalam bentuk pelet tersebut memiliki kandungan iso-protein sekitar 46%, lemak sekitar 8%, dan iso-energi sekitar 18,5 MJ/kg (Catacutan, 2002;Unnikrishnan & Paulraj, 2010). Komposisi bahan dan hasil analisis proksimat pakan uji disajikan pada Tabel 1.…”

“…Tingkat konsumsi pakan harian (KPH) dihitung berdasarkan formula (Ozorio et al, 2009): Rasio konversi pakan (FCR) (Unnikrishnan & Paulraj, 2010):…”

“…Hal ini menunjukkan bahwa kadar asam amino triptopan yang terbaik dalam penelitian ini sudah cukup tinggi yaitu 0,67% bobot kering pakan atau 1,43% terhadap protein pakan. Berdasarkan hasil penelitian Unnikrishnan & Paulraj (2010) yang menyimpulkan bahwa kebutuhan optimum protein dalam pakan untuk pertumbuhan dan retensi protein terbaik untuk juvenil kepiting bakau adalah 47%, dan pakan tersebut mengandung asam amino triptopan sekitar 2,0% kondisi pakan. Pada beberapa ikan budidaya, kebutuhan optimum kandungan asam amino triptopan dalam pakan berkisar antara 0,5%-1,4% terhadap protein (Wilson, 2002;Ahmed, 2012).…”

PERFORMA PERTUMBUHAN KRABLET KEPITING BAKAU (Scylla olivacea) DENGAN FREKUENSI PEMBERIAN PAKAN BERBEDA PADA STADIA PENDEDERAN

“…Beberapa informasi hasil penelitian tentang pakan buatan untuk kepiting bakau, terdata bahwa pada stadia krablet kebutuhan protein dalam pakan adalah 46,9%-47,03% (Unnikrishnan & Paulraj, 2010); lemak 5,3%-13,8% (Sheen & Wu, 1999;Catacutan, 2002); kolesterol 0,51% (Sheen, 2000); dan krablet sudah dapat mencerna beberapa bahan hewani dan nabati (Catacutan et al, 2003;Tuan et al, 2006;Truong et al, 2008). Sementara itu, informasi tentang manajemen (dosis dan frekuensi) pemberian pakan buatan pada stadia krablet masih sangat terbatas.…”