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Turkish Journal of Fisheries and Aquatic Sciences 2008, Vol 8, Num, 2     (Pages: 219-223)

Influence of Eyestalk Ablation and Temperature on Molting and Mortality of Narrow-clawed Crayfish (Astacus leptodactylus)

Majid Askari Hesni 1 ,Nader Shabanipour 1 ,Azadeh Atabati 1 ,Ahmad Bitaraf 2

1 University of Guilan, Faculty of Science, Department of Biology (Marine Science), Rasht, Iran
2 Iranian Fisheries Research Organization, Brackish water Fisheries Research Station. 89715/1123, Yazd, Iran
Viewed : 2042 - Downloaded : 2061 In this study, two experiments were conducted to investigate the effects of eyestalk ablation and temperature on molting and mortality of narrow-clawed crayfish (Astacus leptodactylus) in three replicates. In experiment 1, the percentage of molting in ablated crayfish was significantly higher than the percentage of non-ablated crayfish in control group (P<0.05). In experiment 2, the highest molting and mortality rate was found at 32°C in ablated crayfish treated with four different levels of temperature (20, 24, 28 and 32°C). At temperature of 20°C, the animals had low mortality as well as reduced molting rate (P<0.05). Mortality was mostly occurred within the first days of the trial. Proficient and proper nourishment was found to be very important in all treatments in this study. Keywords : Astacus leptodactylus, Crayfish, Molting, Mortality, Temperature, Eyestalk ablation