What statistical test should I use?

Hello all, I am curently performing a research that seeks to investigate the amounts of bacteria (cells/mm3) in diferent types of sponges. Since I am not an expert on statistics, I was wondering if someone could inform me of what statistical test I could use in order to treat the following data:


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Not a robit
I would if given the sample size an "exact" Wilcoxon test may be prudent. Also of interest may be a permutation test with all permutations explored.