I´m just doing lenght-weight relationships, but I need to know the sex of each individual. So I know there is an appendix masculina in males for example, but it would be very helpful if anyone can provide me a link to a photo or someting more graphic than the drawns on the internet. Thank you :)
Hi,
caridean shrimp sex determination is not like penaeid shrimps. For caridean, we have to see the 1st peleopod of endopods structure. its male having 'M' shape or leaf like structure and female having sharp with setae like structure, related images attached here. may be it will helpfull for you.
It is not the same in all caridean shrimps.
I only have experience in sexing Palaemonidae and Crangonoidae. The first are quite easy to identify sex by looking at the second pleopods: males have two appendages (appendix interna and appendix masculina, while females have only one appendage (appendix interna).
In Crangonidae, sex differentiation is a bit more difficult: you should take a look at the first and second pleopod to be sure. In smaller exemplars,the 'biramous' second pleopods in males are difficult to see and the difference in first pleopod does not always fit the descriptions. I don't know if this is caused by morphological sex reversal.
In attachment two links of articles (for Crangon crangon and Litopenaeus vannamei)
I hope this was useful,
Jan
http://www.int-res.com/articles/ab2013/19/b019p167.pdf
Article Environmental sex determination, external sex differentiatio...
Here's what the second pleopod of a male hippolytid shrimp (in this case, Eualus subtilis) looks like. The projection on the right side is the appendix interna, which is present in both sexes. The middle part, tipped with long, stiff setae, is the appendix masculina and is present only in males. In protandrous species this gets smaller over one or two molts before disappearing altogether.
Thanks to all of you , all your answers were very very helpful, I finally determined the sex without any problem, and now I'm also capable for determine de sex of another cariddean shrimps groups. Saludos!
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