Nursing experiment on tiger prawn, Penaeus monodon Fabricius with various density rates
การทดลองอนุบาลลูกกุ้งกุลาดำด้วยอัตราความหนาแน่นต่างระดับ

Chokchai Luangthuvapranit, D. of Tech. and Industries, F. of Sci. and Tech., PSU.
Pun Yeesin, D. of Tech. and Industries, F. of Sci. and Tech., PSU.
Somjai Pachmano, D. of Tech. and Industries, F. of Sci. and Tech., PSU.
Corresponding e-mail : chokchai@bunga.pn.psu.ac.th

Grant : Government Budget
Published : Research Report
Key words : tiger prawn, Penaeus monodon Fabricius, various density rates

Three density rates of nursing experiment on tiger prawn, Penaeus monodon Fabricius were set up at 70, 140 and 210 nauplii/litre. Larvae were reared from the nauplii stage to the 16th post larval stage within 24 days. Four parameters, varing with these density range, were carried out; average length of larval growth, average growth rate, average % survival rate, and return over cash cost. The average length of larval growth showed no significant (P>0.05) relationship with the variation of den-sity rate. The average length of the 16th post larvae, varing with three density rates, were 12.65, 12.41 and 12.22 mm., while the average growth rates were 0.497, 0.457 and 0.489 mm./day, respectively. The average % survival rate were 66.55, 53.83 and 43.19% corresponding to those three density rates, respectively. The highest average % survival rate indicated at 70 nauplii/litre with a significant (P< 0.05) different from 170 and 210 nauplii/litre. The return over cash costs of production were 48,460 bahts, 104,960 bahts and 121,760 bahts, varing with those density rates. There was clearly significant (P<0.05) higher return over cash costs of the density of 140 and 210 nauplii/litre than that of 70 nauplii/litre.

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