A measly little crab in a 14.5″ grouper. This was a grouper we caught on a natural patch reef, and this crab prey item is consistent with our anecdotal observations of grouper diets. That is, grouper <18″ in natural hard bottom or reef habitat largely feed on crabs and other invertebrates, whereas on our artificial reefs they almost exclusively feed on small fish (2nd photo in the sequence above). Since fish are a higher quality prey (less shell, more meat), the grouper on our artificial reefs may be able to grow faster and have a higher body condition. That is something we are exploring now.