Physical relationship on fecundity and hatching rate of blue swimming crab (Portunus pelagicus Linnaeus,1758) from broodstocks's earthen ponds
2010
Vutthichai Oniam(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Aquaculture) E-mail:[email protected] | Wara Taparhudee(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Aquaculture)
Blue swimming crab, Portunus pelagicus, broodstocks were raised in two earthen ponds for 150 days, then fifty berried female crabs were randomly selected for study physical relationship on fecundity and hatching rate. The results showed that average carapace width, average carapace length and average body weight of mother crabs were 10.57 +- 1.21 cubic cm, 5.00 +- 0.62 cubic cm and 94.56 +- 39.54 g, respectively. The average fecundity was 521,229.8 +- 195,204.6 eggs and average hatching rate was 55.83 +- 24.89 percent. Analysis of regression showed that carapace width (CW), carapace length (CL) and body weight (BW) were related with fecundity (F) but were not for hatching rate (HR). The egg colours, yellow, brown and dark grey, of berried female crabs showed average hatching rate of 56.90 +- 22.60 percent, 74.14 +- 17.90 percent and 64.45 +- 14.05 percent, respectively, which was not significantly different (P GT 0.05).
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