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生产实践中,鱼苗养殖池中往往自然存在大量的克氏原螯虾(淡水小龙虾),它们源自野外,自然生长,且生长良好,对于多数养殖者来说,总以为螯虾
In practice, large numbers of Procambarus clarkii (freshwater crayfish) are often found naturally in fry ponds and they naturally originate from the wild and grow well. For most farmers, crayfish