I am developing a stable isotope analysis project at southern coast of Portugal and I need to collect muscle sample from small deep sea sharks such as Etmopterus spinax, Etmopterus pusillus, Scyliorhinus canicula and Galeus Melastomus.

I need to get muscle samples from these sharks but they will be alive and will be released afterwards. How can I do this without harming too much the shark?

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