I have made observations on my Cardinal shrimp population in terms of gender. Along with females having deeper carapaces, I also noticed a difference in antennule length. Read the post I have made in the Shrimpnow forum below:
A common problem with the Cardinal shrimp Caridina dennerli is identifying the gender of each individual. Although females that have held eggs before have widened, deepened abdomens with a less obvious caridean bend, there is not yet any distinction between males and ‘virgin’ females.
I have noticed however that in my small population the males have longer antennules* than the females. Is this the case in your populations also?Remember, the male you are inspecting may very well be a virgin female; be certain before making your judgment.
This would be an example of sexual dimorphism (a behavioural or morphological difference between genders of a species). Perhaps the longer antennules in the males assist them in chemoreception of the pheromones the females release to stimulate reproduction.
Your input will be greatly appreciated.
*The antennules are the small antennae in front of the eyes of the shrimp, not the antennae which are far longer and more mobile.
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