Evaluation of Growth and Immunological Indices of Allfemale Caspian salmon Salmo trutta caspius Induced by Gamma Irradiation

HIGHLIGHTS

Gynogenesis didn’t have significant effect on Caspian salmon immunological indices.

Gynogenesis weren’t have any effect on Caspian salmon blood chemical indices.

Hematological indices didn’t show any changes by Caspian salmon gynogenesis.

Growth characteristics were improved by gynogenesis in Caspian salmon fish.

Abstract

20 pieces of all-female (produces by using Gynogenesis process via gamma irradiation) Caspian salmon (Salmo trutta caspius) with dosage of 450, 600, 750, 900 and 1050 Gy by gamma irradiation (Co60) with average weight of 2.31 ± 0.22 in a randomized design was transferred to 300 liters tanks (n =3). For 6 months, growth indices including weight gain, feed conversion ratio, specific growth rate were examined. At the end of the period, 3 pieces from each experimental unit were caught and after anesthesia were used using clove oil (100 ppm) and blood sampling and sera isolation, immunological indices (lysozyme activity, complement activity and total immunoglobulin) were measured in fish of different groups. The results showed that the growth rate in the gynogen groups were higher than the control group (p<0.05). The feed conversion ratio in the control treatment was significantly increased compared to experimental groups. The specific growth indices including of final weight 47.2%, FCR 13.46% and SGR 10.9% were improved significantly in the experimental groups in comparison with the control group (p<0.05). Immunological indices (lysozyme, complement activity and, immunoglobulin) in different groups weren’t show significant changes (p>0.05). Therefore, the use of gynogenesis by using gamma irradiation concluded in Caspian Sea salmon, due to the lack of immunological indices and growth improvement.

Keywords:
Caspian salmon (Salmo trutta caspius); gynogenesis; gamma irradiation; growth; innate immunity