Captura, aclimatação e manejo de reprodutores de lutjanídeos, lutjanus sp., e a indução à reprodução em cativeiro do ariacó l. synagris

Abstract

This paper presents a study on capture, transport and breeding management of four species of red snappers from the genus Lutjanus sp., and about the induction to the reproduction of the lane snapper, L. synagris. This study was motivated due to lack of information about the cultivation of red snappers in Brazil, mostly in the northeastern region, in addition to the absence of maintenance protocols of commercial marine species, for the purpose of training routines of breeders, and consequently provide the market with quality fingerlings, encouraging this activity in a manner unprecedented in the country. They were initially approached aspects of capture, transport and acclimatization of four species of lutjanideos, often found on the coast in the Northeast region of Brazil. They were: L. synagris, L. analis, L. jocu and L. apodus. The main techniques used were analyzed from the displacement of the vessel to the sea to capture, assembly of the life support system on the high seas for accommodation of captured specimens, main prophylactic measures on board, as well as his return to the fishing pier of Mucuripe, where animals were landed, packed in transfishes, and sent to quarantine on Marine Fish Research unit at the Centre for Studies in Coastal Environments (CEAC/LABOMAR). From all the species we study, inducing maturation and spawning were conducted only with the species L. synagris, since only this his captive during this work. We used 80 males and 40 females of L. synagris. For hormonal induction, the application of the HCG hormone in females was divided into two portions: the first containing 30% of the total amount of the hormone dose and after 24 hours was applied to second with the remaining 70%, while the males received single dose in all treatments, which was applied along with the second dose in females. Females of all treatments began to spawn after a latency period ranging between 10:15 hours after the second dose. In all the spawns, noted the presence of eggs that had more of a drop of oil. The average values of the diameters of the eggs and oil drops, showed the following values: for the Feed type 1 treatments, 1,1±0,06 and 0,197±0,0049 (1000 UI); 1,0±0,04 and 0,197±0,0049 (1500 UI); and 1,0±0,04 and 0,196±0,0051 (2000 UI; for the Feed type 2 treatments, 1,1±0,07 e 0,20±00 (1000 UI), 1,1±0,06 e 0,199±0,0029 (1500 UI) e 1,1±0,08 e 0,197±0,0049. Regarding the number of eggs released by the female during the spawnings, the hormonal dosage that presented the highest average amount of eggs released, was 2000 IU/kg of HCG. In this, the average number of eggs released during the clutches was 119,229 ± 23,191 eggs. Hormonal dosages showed some significant differences regarding the amount of spawning, fertilization and hatching rate respectively.