|Mud crab fattening in ponds|
Triño, A.T.; Rodriguez, E.M. (2001). Mud crab fattening in ponds. Asian Fish. Sci. 14(2): 211-216
In: De Silva, S.S. Asian Fisheries Science. Asian Fisheries Society: Makati, Metro Manila. ISSN 0116-6514, more
Crab culture; Growing ponds; Growth; Pond culture; Survival; Scylla serrata (Forskål, 1775) [WoRMS]; Marine; Brackish water
|Authors|| || Top |
- Triño, A.T.
- Rodriguez, E.M.
Two independent experiments on mud crab (Scylla serrata, Portunidae) fattening were conducted simultaneously in 150 m2 ponds for 30 days: Expt. I - monosex male (286 plus or minus 1.2 g) vs. monosex female (267 plus or minus 0.9 g) stocked at 0.5 m -2, and Expt. II - monosex male (338 plus or minus 3.1 g) or female (338 plus or minus 2.8 g) vs. mixed sex (338 plus or minus 3.4 g) stocked at 0.25 m r2. The crabs were fed daily a mixed diet of 75% brown mussel flesh and 25% fish bycatch at 10% of the crab biomass. Intermolt full male crabs weighing greater than or equal to 400 g and roed females greater than or equal to 350 g were partially harvested from the ponds after 20 days of culture using lift net and current method. Results of partial harvest from all treatments in both experiments showed a total yield of 51-55% of the total initial number of stocked crabs (450 crabs in Expt. I, and 338 crabs in Expt. II). From this partial harvest, crabs in Expt. I attained a mean final body weight of 496 g, a specific growth rate (SGR) of 2.75 % in males and 432 g, SGR of 2.4% in females. Expt. II gave a mean final body weight of 520 g (males), 484 g (females), and 517 g (mixed sex) and SGR of 1.1, 0.73 and 0.81, respectively. Results of total harvest showed that the overall mean final body weight (372 plus or minus 4.5 g) of monosex male crabs in Expt. I was significantly higher (P < 0.05) than monosex females. However, specific growth rate, carapace length and width, survival, and production were not significantly different (P > 0.05) between monosex males and females. On the other hand, growth and production of monosex crabs in Expt. II was not significantly different (P > 0.05) from mixed sex crabs. However survival of monosex crabs (100%) was significantly higher (P < 0.05) than mixed sex crabs (87 plus or minus 1.88%).