A Trial of Evaluation of Activity in Striped Jack, Pseudocaranx dentex Larvae.

概要

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Starvation tests were carried out mainly at 22°C in order to evaluate the activity of striped jack larvae. Resistance to the starvation was expressed as Survival Activity Index (SAI) .<BR>The larvae showing higher SAI values (>6) in the starvation test also showed higher survival rates in actual seed production process. SAI values of the larvae which were produced by keeping the spawners constantly at 22°C, gradually decreased as spawnings were repeated from March to May, while the value of the larvae from spawners kept intermittently at 22°C did not decrease even at the late spawning season. The larvae floating on the surface of the hatching tank when water turbulence was stopped, showed higher SAI than non-floating larvae. These results suggest that the SAI value is considered to reflect the activity of striped jack larvae, and can be used as a practical indicator of the larval activity in the seed production. In addition, from the result of experiments on temperature effect, there was a correlation between water tempeature (x) and SAI (y) as the following equation at the temperatures from 19 to 24°C; y=-1.16 x+48.81 (r=-0.9982) . However, there were no relationships between SAI and properties of eggs, i.e., floating rate, fertilization rate, hatching rate, egg diameter, or diameter of oil droplet.
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