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Comparative Ultranstructures of the Fertilized Egg Envelopes from Three-spot gourami, Pearl gourami and Marble gourami, Belontiidae, Teleost

1999; Springer Nature; Volume: 29; Issue: 3 Linguagem: Inglês

2287-5123

Dong-Heui Kim, Young‐Kun Deung, Wan-Jong Kim, Dong-Suck Reu, Song Jian Kang,

Aquaculture Nutrition and Growth

The structures of the fertilized egg envelope from three species, three-spot gourami (Trichogaster trichopterus), pearl gourami (Trichogaster leeri) and marble gourami (Trichogaster trichopterus trichopterus) belong to Belontiidae were observed, utilizing light, scanning and transmission electron microscopes. In all three species, the fertilized eggs were the colorless, transparent, spherical, adhesive and pelagic type. A large oil droplet was located in vitelline membrane of the fertilized egg. The egg envelopes have a single micropyle, which is thought to the pathway of sperm in the area of the animal pole. Specially, the micropyle of three-spot gourami was similar to that of marble gourami which is subspecies of three-spot gourami. An outer surface of the fertilized egg envelope was arranged by grooves in all three species. The fertilized egg envelopes consists of two distinct layers; an adhesive outer layer and an inner layer with high electron density. In conclusion, the morphological similarity of the fertilized egg, micropyle, outer surface and transverse section of the fertilized e9g envelope seems to be an indication of the Belontiidae.