Induced spawning in perch, Perca fluviatilis L., using FSH + LH with pimozide or metoclopramide

Abstract

Induced spawning in perch, Perca fluviatilis L., was studied using follicle stimulating hormone and lutenizing hormone (FSH + LH) with the addition of pimozide or metoclopramide. The doses administered to fish were: 75 IU kg−1 of FSH + LH with 5 or 10mgkg−1 of pimozide (P) or metoclopramide (M) in females, and 25 IU kg−1 of FSH + LH with 2.5 or 5 mg kg−1 of P or M in males. Hormonal injections in males (except the injection of FSH + LH with 10 mg kg−1 of M) did not influence the quantity of milt obtained. All females treated in this experiment had oocytes at the same stage of nucleus migration, so the time of ovulation was very synchronous, i.e. 16-24 h after injection. The relationship between the quality of the eggs, expressed as a survival to eyed-egg stage, and latency was inverse. Spawning success, expressed as a spawning effectiveness coefficient (Se), was highest in the fish that had been treated with FSH + LH with a higher dose of M.