YOLK CONSUMPTION DURING EMBRYONARY DEVELOPMENT OF SALMON-RED RAINBOWFISH, Glossolepis incisus. WEBER 1907 (Melanotaeniidae)
DOI:
https://doi.org/10.5216/cab.v10i3.1666Keywords:
Ornamental FishAbstract
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.
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