Zebrafish is popular aquarium fish and laboratory model species but some aspects of advanced spawning technologies,especially of reproduction and rearing in low temperatures (>25°C), which involve the production of high quality and viablegametes, should be studied. In the present study fish before spawning were reared at cold thermal regime: 19-20°C. Fromthree tested temperatures for fish spawning, the highest spawning effectiveness was noted at 23°C. The highest rate of embryosurvival was noted when the temperature in which the spawners were kept before spawning was the lowest (19°C). In thespawning of small breeders groups, the number of males should be higher than the number of females. If the sex rate was 1:1,the lowest embryo survival was noted. From the breeding perspective fish of this species should be reproduced again shortlyafter the completed spawning a time between spawns should be 20 to 60 days if the spawners were kept at 19°C. Keeping thefish between spawning periods more than 40 days results in a significant deterioration of quality of gametes, expressed asembryo survival. It was observed that spawners of this species produce viable gametes and spawn successfully every 20 days,during a few following spawning periods without changes of embryo survival.
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