Novel fish odinagogue

Abstract

The invention discloses a novel fish odinagogue, which is a polypeptide having an amino acid sequence of Tyr-Asn-Lys-Asn-Ser-Phe-Gly-Lys-Arg-Tyr or a polypeptide having an amino acid sequence which has an over 60-percent homology with the amino acid sequence of Tyr-Asn-Lys-Asn-Ser-Phe-Gly-Lys-Arg-Tyr. When use, the polypeptide is dissolved in normal saline for fish according to a ratio of 1 milligram peptide per milliliter of normal saline; the injection amount is 0.5 to 1mu g per gram of fish; and the solution is injected into the fish at a position near the base part of the pectoral fin or the muscle of the dorsal fin. The novel fish odinagogue can induce the ovulation of goldfish, crucian and loach, and is novel fish odinagogue with an important production prospect.

Description

technical field [0001] The invention relates to a novel fish oxytocic agent for artificially inducing fish ovulation in aquaculture. Background technique [0002] The final maturation and ovulation of fish gonads are controlled by hormones secreted by the hypothalamus-pituitary-gonad axis. In addition, environmental factors also have a great influence on the reproductive activities of fish. The sensory organs transmit the stimuli of the external environment (such as temperature, light, rainfall, etc.) to the brain, causing the hypothalamus to secrete gonadotropin-releasing hormone (GnRH), which stimulates the pituitary gland to secrete gonadotropin (GtH) to act on the gonads and promote gonad secretion Sex steroid hormones to promote the maturation of gonads and release sperm and eggs. [0003] However, when the gonads of many fish are mature, due to unsuitable environmental conditions, the fish cannot ovulate normally, and the eggs remain in the body and slowly degenerate,...

AI Technical Summary

Problems solved by technology

[0003] However, when the gonads of many fish are mature, due to unsuitable environmental conditions, the fish cannot ovulate normally, and the eggs remain in the body and slowly degenerate, which brings a lot of pressure to the seedling demand for fish farming. Therefore, artificial oxytocin for fish is an important way to meet the needs of farmed fish fry, and the use of oxytocic agents is the key to the success of fish artificial reproduction

[0004] Kisspeptin was first discovered in mammals, and the inactivating mutation of the gene encoding kisspeptin or its receptor GPR54 gene can cause puberty initiation failure and reproductive defects in humans and mice

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