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Evaluation of growth rate, survival and deformity due to triploid induction in Rainbow trout by heat shock
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Davood Zargham    1, Komeil Razmi2 , Tayyebeh Bashti1 |
1- Iranian Fisheries Science Research Institute
2- 2- Institute of Marine and Antractic Studies, University of Tasmania, Australia |
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Abstract: (1721 Views) |
| The occurrence of puberty usually slows down the body's growth rate because the energy from the food is diverted to gonadal development instead of muscle production. By producing sterile fish, these problems can be solved. One method of sterilization is through ploidy induction (especially triploid). Given that these triploid fish are stressed in the early stages of life, it is important to be aware of their ability to withstand the rearing environment's stressful conditions and assess the rate of growth, survival and deformity caused by shock. 3 treatments were considered for the triploidy inducing in this study. In treatment A, the eggs were placed in water at 27° C for 15 minutes after fertilization for 30 minutes. In treatment B, shock was performed 20 minutes after fertilization for 20 minutes at 26° C and in treatment C, shock 40 minutes after fertilization was performed for 10 minutes at 28° C. A treatment with 13,200 eggs was considered as Control Group (D). The efficiency of triploid induction was 84% in treatment A, 76% in treatment B and 98% in treatment C. The results of 10 stages of juvenile growth study did not show a significant difference until 208 days after hatching (p≥0.05). The fish survival of the treatments was examined in 7 separate stages. In total, the survival of treatment A was 66%, the survival of treatment B was 81%, the survival of treatment C was 72% and the survival of Control group was 86%. Also, the number of larvae with deformity and appearance defects from the hatching stage to the beginning of active swimming and reaching a weight of 200 mg were examined quantitatively and qualitatively. In total, the malformation rate in treatment A was equal to 6.51%, in treatment B was equal to 7.65%, in treatment C was 10.75% and in Control group was 0.6% (p<0.05). |
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| Keywords: Triploid, Rainbow trout, Deformity, Survival, Growth, Oncorhynchus mykiss |
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Full-Text [PDF 709 kb]
(465 Downloads)
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Type of Study: Research |
Subject:
بيوتكنولوژي و فرآوري هاي شيلاتي
Received: 2021/08/10 | Accepted: 2021/12/31 | Published: 2021/12/31
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