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Breeding danio. Aquarium danio fish become sexually mature at the age of five to eight months. By this time, females reach a length of 2.4-2.5 cm, and males - about 2.3 cm. Pairs are inseparable during the mating period and practically do not break away from the fertilization process. The abdomen of females becomes noticeably more rounded. The season is not so important in the matter of reproduction. Danios show themselves to be fruitful at any time of the year. Much more important is abundant and high-quality nutrition.