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Techniques for in vivo extraction of gonads of male European catfish (Silurus glanis) for the artificial reproduction
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Techniques for in vivo extraction of gonads of male European catfish (Silurus glanis) for the artificial reproduction
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Techniques for in vivo extraction of gonads of male European catfish (Silurus glanis) for the artificial reproduction
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Journal Article
Techniques for in vivo extraction of gonads of male European catfish (Silurus glanis) for the artificial reproduction
2019
Overview
Artificial reproduction of European catfish Silurus glanis was embarrassed by problems with stripping high-quality milt without contamination by urine. Analogical difficulties were noticed during milt stripping in male African catfish Clarias gariepinus. So fish-farmers sacrificed male catfishes for artificial propagation. Alternative method is non-lethal laparotomy for sperm collection. In this work we used surgical techniques for partial resection of testicular tissue in male catfish in vivo and a new method of urine descent before sperm selection. General anaesthesia was performed by immersion of fishes in tank with 25 L water with clove oil at the dose of 0.04 mL L-1. Only a small incision (5-8 cm) was sufficient for ablation of part of testis. For the first time, separate sutures were applied to the peritoneum and skin for creating additional anastomoses which hold and fix internal organs. The regeneration of testis was noted. As alternative to surgical method we used catheterization of urine bladder before sperm collection. These methods are designed to keep alive male catfishes and to obtain high-quality milt without contamination by urine. The techniques of partial gonadectomy and urinary bladder catheterization could be used in farming and conservation aquaculture of European catfish and other silurids.
