The impact of thyroxin hormone on the survival, growth and developments of Iranian sturgeon Acipenser persicus eggs and larvae  

In this study, the effect of thyroxin hormone bath on the survival, growth and development of Persian sturgeon (Acipenser persicus) eggs and larvae was examined. Field activities carried out at Shahid Marjani sturgeon hatchery and culture center located at the southeast region of the Caspian Sea coast in the Golestan province. Fertilized eggs (150 g per tub) from one mature wild female Persian sturgeon broodstocks prepared and then in following experiment,  fish larvae after hatching, placed in plastic tubs (60-litres) for six hours bath with different concentrations of thyroxin (0 ppm as a control , 0.1, 0.5 and 1 ppm as treatments) in triplications. Variables such as the onset of eggs hatching, hatching rate, survival rate and also the mean weight and length of larvae till the start of first exogenous feeding were evaluated in a completely randomized design. For statistical analysis (ρ<0.05), the one-way ANOVA were used which followed by Duncan's test using the SPSS software. All the curves and tables were processed using Microsoft Excel software. The results indicated that there were no significant differences in mean hatching rate, survival percentage and also mean weight and length of fish larvae between treatments and control group.