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Macrobrachium Rosenbergii

Macrobrachium Rosenbergii - Blue claw

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 dependant upon their fighting abilities for food supplies, shelter and therefore female mates.

Small males, being significantly smaller in size than the other two types and are unable to fight off other males, and instead apply the alternative mating tactic of sneaking. The small male attempts to fertilize a female while she is being guarded by a blue claw mate. This is a high risk tactic, as they have a chance of being killed or injured by the larger blue claw males with a limited success rate of achieving fertilization.

The orange claw males are unable to perform sneak tactics due to their larger size compared to small males; or successfully fight competitively against larger blue claws. This means they are a small population percentage in nature due to their low fertilization rates.

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