"macrobrachium rosenbergii" (giant freshwater prawns or giant river prawns) males have three distinctive body types (morphotypes) upon reaching sexual maturity - small males, orange claw and blue claw. although all three have different appearances; physical size, claw length, behaviour and anatomy; they are all still able to fertilize females. this leads to male competition over female mates and thus the use of alternative mating tactics. the dominant males tend to be blue claw over orange claw, then orange claw over small males. dominance is dependent upon their fighting abilities for food supplies, shelter and therefore female mates.