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我国北方寒冷地区,一般10月下旬结冰,翌年4月上旬解冻,冬季封冰期长达5～6个月,如何确保鱼种安全越冬?
Cold areas in northern China, generally frozen in late October, thawed in early April the following year, the winter seal-up period of up to 5 to 6 months, how to ensure the safety of species of winter?