FIELD: aquiculture. SUBSTANCE: method involves rearing aquatic organisms in closed water ecosystem with the usage of fertilizer, such as composition with controlled release in water ecosystem. Composition contains pellets with particles making core and releasable material reacted with or covering core material. Core material is selected from the group containing phosphorus, nitrogenous and potash sources and mixture of them. EFFECT: reduced consumption of fertilizer by introducing them once a season. 14 cl, 6 tbl, 2 ex
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