Nursery culture of mud crab Scylla serrata using different feeding rates
วันที่
2017Page views
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นามธรรม
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-m2 net cages installed in the nursery earthen pond at stocking densities of 50 m-2 for Phase 1 and 10 m-2 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.
การอ้างอิง
Alava, V. R., Sumile, J. D., & Parado-Estepa, F. D. (2017). Nursery culture of mud crab Scylla serrata using different feeding rates. In E. T. Quinitio, F. D. Parado-Estepa, & R. M. Coloso (Eds.), Philippines : In the forefront of the mud crab industry development : proceedings of the 1st National Mud Crab Congress, 16-18 November 2015, Iloilo City, Philippines (pp. 46-51). Tigbauan, Iloilo, Philippines: Aquaculture Department, Southeast Asian Fisheries Development Center.
Type
Conference paperISBN
9789719931072Related items
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Management of feeding aquaculture species
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Updates on the seed production of mud crab
Quinitio, Emilia T.
; ; ; (Aquaculture Department, Southeast Asian Fisheries Development Center, 2015)
Widespread interest in mud crab species is increasing because these are highly prized both in domestic and export markets. Among the three mud crab species commonly found in the Philippines, Scylla serrata, S. olivacea, and S. tranquebarica, S. serrata is preferred by farmers because it is larger and less aggressive than the other species. Likewise, S. serrata is the most widely distributed species in the Indo-west Pacific region. Hatchery-produced seedstock are presently used by some crab farmers in their grow-out operations. In the hatchery phase, feeding mud crab larvae with shrimp formulated diets and natural food was found to reduce the occurrence of molt death syndrome, one of the major problems in seed production. Larvae given 25% formulated diet (FD) + 75% natural food (NF; rotifers and Artemia) and 50% FD + 50% NF showed better performance than those larvae fed 100% FD, 100% NF and 75% FD + 25% NF indicating that usage of natural food, especially the expensive Artemia, can be reduced. Since the early crab instar (C) produced in the hatchery need to be grown further before stocking in grow-out ponds, two phases of nursery culture have been developed. C1-2 are grown to 1.5-2.0 cm carapace width (CW) size in the first phase and further grown to 3.0-4.0 cm CW in the second phase. Nursery rearing is done in net cages installed in ponds for easy retrieval. A combination of mussel or trash fish and formulated diet is used as feed. Domestication of the mud crab S. serrata as a prerequisite to selective breeding has been done at SEAFDEC/AQD. Likewise, defining criteria for the determination of quality of newly hatched zoeae for stocking in the hatchery was initiated. Newly hatched zoeae were subjected to starvation and stress test using formalin. Starvation failed to elicit responses that were significantly different between the good and poor quality larvae hence it is not suitable for larval quality evaluation. Based on three-year data, the formalin stress test gave mean cumulative mortalities of 2.38±0.32, 8.24±0.88, 20±1.58 in good quality larvae, and 43.74±2.39 while 22.93±4.19, 63.68±7.17, 84.29±3.88 and 97.65±1.06 for poor quality larvae at 0 (control), 20, 30 and 40 ppm formalin, respectively. As formalin level increased, cumulative larval mortality also increased regardless of the quality of the larvae. Formalin stress test proved to be a reliable method to determine whether a batch of newly hatched zoeae was of good or poor quality.
