Серебряный карась в отличие от повсеместно распространенного золотого карася отличается серебристой окраской тела и более быстрым ростом. Серебряный карась питается мелкими растительными и животными организмами толщи воды. Эти организмы слабо используются карпом. Поэтому при совместном выращивании с карпом серебряного карася с одного гектара прудов можно получать не 2—3 центнера рыбы, как при выращивании только одного карпа, а 4—5 центнеров.
Половозрелым серебряный карась становится в возрасте 2—3 лет. Количество икры, выметываемое одной самкой, в среднем равно 254 тысячам штук. Икрометание и развитие икры протекает так же, как у карпа.
В большинстве водоемов водятся лишь самки этой рыбы, а самцы или отсутствуют, или встречаются единицами. Поэтому, если в прудах выращивать только одних серебряных карасей, они размножаться не могут. Икра серебряного карася развивается в том случае, если ее оплодотворить молоками другого вида рыбы, например золотого карася, сазана или зеркального карпа.
В Саввинском опытном рыбном хозяйстве под Москвой из дикого серебряного карася, завезенного из озера Петропавловского под Хабаровском, выведена новая порода прудового серебряного карася. Саввинский карась растет в 5 раз быстрее обычного. На первом году жизни он вырастает до 30 граммов, а на втором году — до 250— 300 граммов.
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