一、头胸甲白化症1、发生时期及症状:本病多发生在从养殖池挑选亲虾入室内池不久大约10d～20d内,起初只是头胸甲部分变白,在水中游动时容易观察到,捞上来观察无明显症状。以后白化部分逐渐扩展到整个头胸甲,头胸甲好像和头部呈脱离状,虾在水中游动时尤为明显。以后颜色逐渐变为 First, the cromophlla albino 1, the occurrence of symptoms and symptoms: the disease occurred in the selection of brood ponds from the pond into the indoor pool about 10d ~ 20d soon, at first only part of the carapace white, swimming in the water easily Observed, fishing up to observe no obvious symptoms. After the albino part of the gradual expansion of the entire head carapace, head and chest seems to be detachment, shrimp swimming in the water is particularly evident. After the color gradually becomes