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鱼蟹不宜混养:水产部门利用两组养殖模式,即在面积相等的600m~2池塘内,一组投放成蟹4.5kg,10月份产蟹16kg,纯收入3600元;另一组投蟹4.1kg、鲢鳙鱼种4kg,10月收成蟹8.3kg,成鱼16kg,收入2050元。从两组模式看出,鱼蟹混养效益不如单一养蟹。原因是河蟹需安静的环境,特别在脱壳期间,受不得半点惊扰,尽管鲢鳙鱼不致残食幼体河蟹,但影响其脱壳过程。调查发现,鱼蟹混养池中水草上附有许多死亡脱壳蟹可说明此问题。
Fish and crabs should not be polyculture: aquaculture departments use two groups of breeding mode, that is, in an area equal to 600m ~ 2 ponds, a group of crab 4.5kg, crab production in 16kg in October, the net income of 3600 yuan; kg, silver carp and bighead carp 4kg, October crab 8.3kg, adult fish 16kg, income 2050 yuan. Seen from the two groups of patterns, the benefits of fish farming mixed as a single crab. The reason is that crabs need a quiet environment, especially during shelling, which can not withstand the slightest disturbance. Although silver carp and bighead carp do not eat crabs, they affect the shelling process. The survey found that fish and cows polyculture ponds in the water with many dead crab shells to illustrate this problem.