I am conducting a study in which I identified the species per catch of two different fishing techniques and now I want to test if there is any significance in the composition of the species between those two techniques and maybe at a later stage incorporate the season. While searching in other studies I identified Bray-Curtis dissimilarity as a common technique but since I am not feeling very comfortable with my statistical skills I would like to know if this is the best way or there are more techniques. 

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