Effect of diet (fatty acid and protein) content during spawning season on fertility, eggs and larvae quality of common porgy (Pagrus pagrus, Linnaeus 1758)

摘要

Spawning in captivity of two red porgy’s broodstock groups (Pagrus pagrus) of the same age wasstudied during one season. These two broodstock groups, designed A and B, were fed withdifferent regimes during the spawning period. A group was fed on moist pellet while (A dietcontent 45% proteins, 10% lipids) B group was fed on fresh fish (A diet content 48 % protein,8.7% lipids). The total eggs collected number for A group was 22 million eggs of which 18 millionwere viable, fertility was 474,966 eggs kg-1 female. For B group, eggs collected number was 36million eggs of which 31 million were viable fertility was 769,186 eggs kg-1 female. Statistically,there was a significant difference between the two groups in terms of quantity and quality ofspawning and larval survivals recorded on second day after hatching and on fifth day afterhatching.