What Divers Should Know About Crawfish

While the name "crawfish" often brings to mind freshwater environments, the term is also locally applied to certain saltwater crustacean species in various parts of the world. These intriguing animals are expert benthic dwellers, meaning they spend their lives foraging along the bottom. You might spot these opportunistic omnivores methodically exploring the sediment-water interface, using their small claws to sift through detritus and organic matter for food.

Structurally, crawfish, like many decapod crustaceans, possess a body organized into twenty segments, grouped into a distinct cephalothorax and abdomen. They breathe through delicate, feather-like gills and generally reach an average length of around 17.5 cm (6.9 inches). Their diet is incredibly varied; they are scavengers, consuming anything from living or decomposing plant and animal material to fine particulate organic matter. Their methodical search for food is a key part of their ecological role on the seafloor.