Philippines : In the forefront of the mud crab industry development : Proceedings of the 1st National Mud Crab Congress
http://hdl.handle.net/20.500.12066/5234
2024-03-29T12:52:43ZPhilippines: In the forefront of the mud crab industry: Proceedings of the 1st National Mud Crab Congress
http://hdl.handle.net/20.500.12066/5279
Philippines: In the forefront of the mud crab industry: Proceedings of the 1st National Mud Crab Congress
Quinitio, Emilia T.; Parado-Estepa, Fe Dolores; Coloso, Relicardo M.
2017-01-01T00:00:00ZBiological evaluation of existing feed formulations for the grow-out culture of the mud crab, Scylla serrata
http://hdl.handle.net/20.500.12066/5273
Biological evaluation of existing feed formulations for the grow-out culture of the mud crab, Scylla serrata
Catacutan, Mae R.
Quinitio, Emilia T.; Parado-Estepa, Fe Dolores; Coloso, Relicardo M.
This study was conducted to identify a formulated pelleted feed for the grow-out culture of the mud crab. A commercial crab feed (CCF) was evaluated together with fish by-catch (FBC) and three test diets (formulated and pelleted) of similar dietary energy (1723 MJ/Kg diet) based on published works. The test diets contained 48% (D-1), 43% (D-2), and 38% (D-3) crude protein (CP), respectively. All the five dietary treatments were fed to crablets (5 to 6 g body weight) that were individually stocked in 60-L tanks. Each dietary treatment was fed to six crabs. Crustaceans grow by molting which is not simultaneous, hence, each crab was monitored daily. After the third molt (M3) survival rates in D-1, D-2 and D-3 ranged from 33%-66% compared with only 16% in FBC, and 0% in CCF where no crab survived to molt for the second time (M2). Nutrients in FBC may not be sufficient to sustain growth and survival, while water stable CCF may lack a feed attractant. Diets D-1, D-2, and D-3 were evaluated in another feeding experiment to identify the basal diet for the crab. All crabs molted until M3 and no significant differences were noted on growth performance between treatments. However, D-1 (48% CP) was identified as the basal diet due to better numerical values observed in terms of feed conversion ratios and specific growth rates.
2017-01-01T00:00:00ZEffect of feed binder on water stability and digestibility of formulated feed for the mud crab Scylla serrata
http://hdl.handle.net/20.500.12066/5272
Effect of feed binder on water stability and digestibility of formulated feed for the mud crab Scylla serrata
Catacutan, Mae R.
Quinitio, Emilia T.; Parado-Estepa, Fe Dolores; Coloso, Relicardo M.
The binding capacity of six natural and eight synthetic feed binders were tested in a basal diet formulated for the mud crab. Incorporation levels of natural binders ranged from 1 to 25% while those of synthetic binders ranged from 0.1 to 5% and these were tested for pellet stability in seawater by a) 10-min immersion, and b) at different time intervals. Pellets with synthetic binders were more water-stable than pellets with natural binders. Three synthetic binders and natural binders (glutinous rice starch and carrageenan + CMC) showed best results. The Apparent Digestibility Coefficients (ADC) of crude protein (ADCCP) and crude fat (ADCCFt) of the basal diet were determined when selected feed binders were included in the formulation. These were determined by using an inert indicator, chromic oxide. Results showed that the ADCCP and ADCCFt of the basal diet were not similar when different binders were used, and these differences ranged from 3 to 7%. Carrageenan combined with a synthetic binder improved ADCCP and CDCCFt values.
2017-01-01T00:00:00ZNursery culture of mud crab Scylla serrata using different feeding rates
http://hdl.handle.net/20.500.12066/5271
Nursery culture of mud crab Scylla serrata using different feeding rates
Alava, Veronica R.; Sumile, Jony D.; Parado-Estepa, Fe D.
Quinitio, Emilia T.; Parado-Estepa, Fe Dolores; Coloso, Relicardo M.
The effect of different feeding rates on the production and profitability of Phases 1 and 2 (3-week each) nursery culture of hatchery-produced crab Scylla serrata was determined. Minced mussel meat and formulated diet (at a ratio of 30:70) were fed to crabs. The crabs were stocked randomly in 12-m<sup>2</sup> net cages installed in the nursery earthen pond at stocking densities of 50 m<sup>-2</sup> for Phase 1 and 10 m<sup>-2</sup> for Phase 2. Crabs were fed three times daily at 0830, 1300 and 1630h h. In Phase 1, feed conversion ratio (FCR) at a feeding rate of 100% of initial crab biomass day-1 for the entire three weeks was the lowest (p<0.05) while survival, body weight (BW), carapace width (CW) and carapace length (CL) were not different (p>0.05) among crabs given different feeding rates. For Phase 2, the feeding rate of 40-30-20% of crab biomass day-1 (week 1-2-3) resulted in lowest (p<0.05) FCR that was not significantly different from FCRs of crabs fed 50-40-30% and 60-50-40% of BW. Crab BW, CW and CL were not different (p>0.05) among feeding rate treatments. Profitability was better when feeding rate used was 100% of initial crab biomass day-1 for the entire Phase 1 or 100-50-40% of crab biomass day-1 (for week 1-2-3). A feeding rate of 50-40-30 % of crab biomass day-1 (week 1-2-3) was more profitable in Phase 2.
2017-01-01T00:00:00Z