(Pb0.001). Re-verification of ploidy done using nuclear major axis of
erythrocytes allowed successful sorting of diploids within the treated
groups. After ploidy re-confirmation, both the treated groups were
stocked with only triploid (100%) individuals.
Survival from the blastula stage until the yolk-sac stage of triploid
fish (heat and cold groups) was less than that of diploid control
(Fig. 1). Survival rate at the blastula stage showed significantly higher
percentage (Pb0.05) for diploid controls as compared to both shocktreated
groups. However, among the treated groups survival rate at
this stage did not vary much. Survival rates in the other two development
stages i.e. hatching and yolk sac absorption stages also showed
significant difference between control and treated groups (Pb0.001).
Survival rate among the heat-shocked and cold-shocked groups at
these stages also showed variation (Pb0.05).
Themean bodyweight, total length, gonadweight, GSI and condition
factor for both the sexes of triploid and diploid fish after 120 days are
given in Table 1. After 120 days of culture, themale fish in all the groups
gainedmore weight than females. But when average weight gained was
statistically analyzed separately for both sexes, there was no significant
difference between the average weights of males belonging to various
groups. Whereas the average weight gained by the females in heatshocked
group showed a significant result with diploid females
(Pb0.05). Although the average weight of female cold-shocked group
was higher as compared to control, it was not statistically significant