Wild-caught Atlantic cod have a variable microbial intestinal community. (a) Rarefaction curve analysis showing the number of detected OTUs per sample based on read number for 11 specimens. Sequences are clustered using a pairwise similarity cut-off of 97%. (b) A limited number of highly abundant OTUs (based on read number) are identified in all specimens by comparing rank abundance plots of all OTUs (97% similarity, black) to OTUs that are shared (red). Individual rank abundances (grey) show variation among specimens. (c) The total number of detected OTUs (black) and the number of OTUs shared (red) depends on sequencing similarity cut-off values.