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(一)美国青蛙。(1)蝌蚪:美国青蛙8—9月产卵孵化的蝌蚪,当年大多不能变为幼蛙,则以科蚪越冬。蝌蚪的耐寒能力较强,在冰层下只要有水就能存活,当气温降到10℃以下时,先将越冬池进行清塘消毒后,灌水1米深以上,将水培肥,适当投些饵料,将蝌蚪放入就能安全越冬,一般成活率可达90％。(2)带尾幼蛙前后肢都已发生,但尾部尚未消失,变态未完成的幼蛙对寒冷和不良环境抵抗力弱。越冬期或开春后死亡率常高达50％以上,需要特别保护。①开春按蝌蚪越冬保护法,在池上覆盖稻草,塑料薄膜等御寒
(A) American frogs. (1) tadpoles: US frog August-September tadpole spawning hatchlings, most of the year can not become a frog, the coleopod wintering. Tadpoles strong ability to withstand cold, as long as there is water in the ice can survive, when the temperature dropped below 10 ℃, the first pond after Qingtang disinfection, irrigation more than 1 m deep, water and fertilizer, the appropriate investment Some bait, the tadpoles will be able to put safe winter, the general survival rate of up to 90%. (2) Both frog and hind limbs have occurred, but the tail has not disappeared, and the perverted frogs have weak resistance to cold and adverse environment. Overwintering or early spring mortality rate of up to 50% or more, the need for special protection.开 spring tadpoles wintering protection law, in the pool covered straw, plastic film and other warm