<b>Induced spawning of fat snook <em>Centropomus parallelus</em> Poey 1860, with different doses of LHRHa</b> - DOI: 10.4025/actascianimsci.v25i1.2117

Abstract

The fat snook, Centropomus parallelus, is found almost in the entire Brazilian coast and has a great potential for marine aquaculture. The aim of this study was to evaluate different doses of the luteinizing hormone-releasing hormone analogue (LHRHa) on the fat snook spawning induction. Reproducers (weighing from 515g to 1553g) were kept into four tanks (4.8 x 1.8 x 1.2m). They were submitted to three dosages of LHRHa: 30, 50 and 70µg per kg, injected intramuscularly. Spawning rates obtained were 33%, 50% and 56%, and fertilized spawning rates were 26.6%, 37.5% and 50%, respectively, without significant differences among treatments (p>0.05). The mean number (± sd) of eggs released, of fertilized eggs, and of larvae (per kg of female in each spawning) was 193,000 (± 122,000), 199,300 (± 115,000) and 137,800 (± 78,000), respectively, with no significant differences among treatments. There were also no significant differences among treatments in relation to the other traits analyzed: oocyte diameter (435µm ± 26), egg diameter (693µm ± 68), fertilization rate (90.5% ±12) and hatching rate (71.2% ± 19). The results indicated that fat snook could be spawned with 30 to 70µg of LHRHa per kg of fish.