Abstract
ABSTRACT Males of the giant Malaysian prawn Macrobrachium rosenbergii appear in a hierarchically arranged series of three morphs referred to as blue claw, orange claw, and clear claw males. Since transformation from the subdominant clear and orange claw morphs to the dominant blue claw morph entails changes in the size and color of claws, we examined the fiber composition of the claw muscles using histochemical techniques for detecting myofibrillar ATPase and NADH-diaphorase. The claw opener and closer muscles remain uniform in all three morphs. The small opener muscle has exclusively slow, high-oxidative fibers, while the large closer muscle has a central band of fast, low-oxidative fibers sandwiched on either side by slow, high-oxidative fibers.
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