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he xie tui ke bu sui de fang zhi ji qiao
Author(s): 
Pages: 34
Year: Issue:  2
Journal: Veterinary Pharmaceuticals & Feed Additives

Abstract: 选好蟹种长江水系中的河蟹品种有优劣之分.既要拣去非长江品种的,又要去除已经性成熟的.凡第一侧齿超出眼眶的为长江品种,低于眼眶的均为非长江品种:凡脐部(雌性)已覆盖整个腹甲,且边缘长出绒毛的,是已经性成熟的,必要时,可揭开腹甲观察,成熟雌性的卵巢呈紫色,甚至可见卵粒.成熟雄性有白色精液.不慎混入的性成熟蟹种大都会因蜕不出壳而死亡.混入数量越多,死亡率越高.……
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