雄性日本沼虾个体发育的研究

ONTOGENY OF THE MALE PRAWN MACROBRACHIUM NIPPONENS (CRUSTACEA:DECAPODA)

对未经室内和经室内养殖的雄性日本沼虾进行了研究。发现随虾体长的增长,其相对螯足长不断增大,螯足的颜色由清亮变为土黄色,更大的个体螯足可变为墨绿色或蓝色,性腺体重指数也发生变化。结果表明,日本沼虾雄虾在其个体发育中形成三个不同的形态型:小螯足型、中螯足型和大螯足型。

Studies were conducted with wild and laboratory cultured Macrobrachium nipponense. As the prawns grew, their relative claw length(RCL) incresed and the prawns in different body length range had differet RCL. The claw color changed transparent without color yellow, along with the increasing of body length, especially RCL, some wild larger prawns with RCL more than 1 3 and laboratory cultured prawns with RCL more than 0 81 developed dark green claw.the gonad somatic index of the prawns with dark green claw was significantly different from those with clear and yellow claw.The results suggested that Macrobrachium nipponens develops three morphotype:small claw male, medium claw male and large claw male during ontogeny