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In this study, the embryonic development of the eggs in the Mastacembelus mastacembelus (Bank & Solender, 1794) was examined. At the same time, possibilities of arti¢cial breeding through arti¢cial insemination were investigated. Arti¢cial insemination was achieved by mixing the eggs of the mature female and sperm of the mature male samples caught with gill nets (22 Â 22) in Ataturk Dam Lake in Turkey. To this end, ¢rst in a Petri dish (100 Â 20), the testes were cut into small pieces with a lancet and the mixture of sperm^testes-tissue was obtained. The fertilization rate of the eggs was found to be 80%. The diameter of the eggs ranged from 2.015to 1.147 mm. The perivitelline space formed 0.5 h after insemination. The ¢rst cleavage occurred at the animal pool 4 h after insemination. The oil droplets had fused to a single droplet 19 h after insemination. The blastoderm became an embryonic shield 30 h after insemination. The blastoderm covered almost half the egg 40 h after insemination and embryonic body was formed. The blastoderm covered almost the whole egg 50 h after insemination. Some somites were discernible 59 h after insemination. The embryonic body reached two-third of the circumference of the egg 70 h after insemination. The tail bud began to separate from the yolk 77 h after insemination. A newly hatched larva was observed at 85 h after insemination.

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