YOLK CONSUMPTION DURING EMBRYONARY DEVELOPMENT OF SALMON-RED RAINBOWFISH, Glossolepis incisus. WEBER 1907 (Melanotaeniidae)

• Main Author: Ferreria, André Veloso
• Publication Date: 2009
• Other Authors: Vidal Jr., Manuel Vazquez, Andrade, Dalcio Ricardo, Mendonça, Pedro Pierro, Yasui, George Shigueki, Mattos, Douglas Cruz
• Format: Article
• Language: por
• Source: Ciência animal brasileira (Online)
• Download full: https://revistas.ufg.br/vet/article/view/1666
• topic: Ornamental Fish; Peixe ornamental; ontogenia; Desenvolvimento inicial.

The consumption of yolk on development of embryos of the salmon-red rainbowfish (Glossolepis incisus) was examined under controlled hatchery conditions. Naturally-fertilized eggs, obtained by natural spawning of cultured adults, were stocked into floating sieves in 40L flow-through aquaria at temperature of 28°C. A photoperiod of 16L: 8D was maintained. The embryos have a long period of hatching about 7 days at 28ºC, consuming almost all yolk during the early stages into the eggs. At hatching the newly-hatched larvae yolk-sac is reduced, but still present and the larvae are strongly swimmers and have a functional mouth, enteric peristaltic movement and anus opened suggesting an initial exogenous feeding stage. Differently to others species of tropical fishes that have a long time for the weaning, larvae of salmon-red rainbowfish are already for becoming first-feeding larvae in few hours after eclosion.KEY WORDS: Early development, ontogeny, ornamental fish.