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Induced-spawning of fish by hormone implantation
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A. Rahdari   , B. Falahatkar * |
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Abstract: (2175 Views) |
Injection of gonadotropin-releasing hormone analogues (GnRHs) produces luteinizing hormone (LH) from pituitary that stimulates gonadal maturation. In female fish, these analogues drive the final oocyte maturation, ovulation and finally spawning. Traditionally, they have been injected either intramuscularly or intraperitoneally. Depending on GnRH type, fish species and water temperature, one-step administration causes the peak of LH within 12-72 hours. In some fishes, this short-time effect of injection is enough for spawning during 2-3 days following the injection. However, asynchronous fishes need more injections but, multiple hormone injections are stressful and harmful and in the long-term, they inhibit reproduction. Therefore, sustained-release delivery systems can be used. A single application of GnRHa-delivery system enters GnRHa into the blood stream continuously, resulting pituitary stimulation for releasing LH that may take several weeks. Therefore, in delivery system, multiple injections can be replaced by single injection. There are different delivery systems includes: cholesterol pellets, ethylene-vinyl acetate implants, and biodegradable microspheres. This paper discusses the methods of hormonal implantation and possibility of its application in some Iranian fishes.
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| Keywords: Implantation, Hormone, Spawning, GnRH |
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Full-Text [PDF 640 kb]
(503 Downloads)
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Type of Study: Applicable |
Subject:
Special
Received: 2020/06/5 | Published: 2020/03/29
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