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DOI:
https://doi.org/10.5007/%25xAbstract
Hypophysation to induce the final maturation and ovulation/ spermiation of fishes is very well- known and has been used by Brazilian fish breeders, although there might be other hormonal inductors with physiological and economic advantages.This paper looks for the ideal dosage of LHRH-a to induce the final maturation and spawning in males and females of “pacu-caranha” (Piaractus mesopotamicus) comparing to traditional technique of induction. The quality and of sperm and eggs are evaluated, as well as production costs. The best results were achieved with the use of 16.5 ? g of LHRH-a/ kg for females (two dose), and 7.0 ? g of LHRH-a/ kg for males, the effects being qualitatively and quantitatively similar to those odserved in the traditional treatment with EPC. The use of LHRH-a yields a cost 4.5 times lower.
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