Use of Gonadorelin [6-D-Phe] in the Induction of captive spawning in chame Dormitator latifrons (Richardson, 1844)

Abstract

The Pacific fat sleeper Dormitator latifrons is a species of commercial interest with great potential for aquaculture; however, its culture depends mainly on the capture of fry from the wild. Its reproduction in captivity is not fully controlled, but there is experience with analog inducers that have demonstrated viability in releasing gametes. This work evaluated the use of Gonavet Veyx, Gonadorelin [6-D-Phe], a synthetic analog of the gonadotropin-releasing hormone (GnRH), as an inducer of spawning in D. latifrons. Captive wild specimens were induced with Gonadorelin[6-D-Phe], and once spawning was produced, the eggs were maintained in tanks at salinities of 5, 10, and 15 ‰. The number of eggs produced, total and relative fecundity, hatching percentage, and larval monitoring were assessed. Ninety percent of the pairs of broodstock that were induced spawned at 48 h, particularly during the night. Eggs had an average diameter of 293.3 ± 3.3 µm and hatched at approximately 17 h of incubation. The best hatching was achieved at a salinity of 15‰ (95%), followed by 10‰ (80%), and finally at 5‰ (50%). Gonavet Veyx proved to be an effective compound for induced spawning in D. latifrons, obtaining viable eggs and larvae.