Evaluation of Off-Season Spawning Techniques and Larval Diet Supplementation of Yellow Perch (Perca flavescens)
抄録
400 yellow perch (Perca flavescens) were divided into four groups,
each targeted to spawn in a different season. The photo-thermal conditions of
each group were manipulated to mimic seasonal changes that initiate
reproductive activity. Spawning occurred in all groups. Using photo-thermal
manipulation it is possible to spawn yellow perch at different times of year
providing multiple crops of fingerlings.
Eggs and larvae of yellow perch were analyzed for fatty acid content. A
feeding trial was conducted comparing experimental diets high in
eicosapentaenoic (EPA) and docosahexaenoic acid (DHA) to the traditional
larval diet used by perch producers. Enriching live foods with EPA and DHA
improved survival. Although it was high in both EPA and DHA, the emulsified
diet used resulted in lower survival than the control diet because the larvae
did not accept it. However, yellow perch larvae may be able to be weaned
onto manufactured diets, further improving survival.