Rearing of berried female mud crab, Scylla serrata (Forskal) in concrete ponds with different substrates: Technical paper no. 19/2000
2000
Akapong Nakapong | Surachart ChaweepackDepartment of Fisheries, Bangkok (Thailand). Aquafeed Quality Control and Development Div. Chanthaburi Coastal Aquaculture Development Center)
Female mud crabs of stage 3 with ovarian size less than 40 percent of body cavity were reared in 2.4*2.9 square m plastic net cages fenced in 2.4*10 square m concrete ponds until reached berried stage. Each pond contained 45 individuals at 3 different treatments, Pond No. 1 was with sand substrate, Pond No. 2 was with sand in plastic basins, and Pond No. 3 without sand substrate. At the end of experiment, the average number of berried female mud crabs survived in pond no. 1-3 were 17, 16, and 4 individuals or 37.78, 35.56, and 8.89 percent respectively. The average number of zoea of berried female mud crabs that attained hatching out in pond no. 1-3 were 2,817,888, 2,992,481, and 166,400 individuals respectively. The difference was highly significant (P LT 0.01). Three female mud crabs from pond no. 1 and no. 2 developed to berried stage again in average 36.67+-7.23 and 33.33+-0.58 days respectively after first spawning. It took about 7-14 days average 9.12+-1.43 days to reached zoea stage 1 at temperature 25-31 deg C.
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