Metazoan parasites and commensals of freshwater crayfish

 
A number of renowned parasitologists are, or have been, interested in freshwater crayfish and so there are a large number of parasites reported from freshwater crayfish. Metazoan parasites of freshwater crayfish include digeneans (flukes), cestodes (tapeworms), nematodes (roundworms) and acanthocephalans (spiny headed worms). Most often metazoan parasitism is of little consequence to the health of the crayfish unless the parasite is present in such high numbers that they block the functioning of organs. However, some parasites which are common in freshwater crayfish in some areas are important from a human health perspective, eg. the digenean Paragonimus causes serious lung infections in human and is very common in some crayfish populations in Asia where crayfish are sometimes eaten raw. Cooking quickly kills the parasites, so crayfish should be cooked prior to consumption. Click here or here to find out more about Paragonimus.
 
The turbellarian temnocephalids, annelid branchiobdellids and several arthropods are well known commensals of freshwater crayfish and rarely cause disease. However, their numbers will increase on crayfish if water quality deteriorates and/or if the crayfish are affected by other disease conditions. Temnocephalid eggs attach steadfastly to the exoskeleton, as do the cocoons of branchiobdellids, and heavy infestations are problematic to crayfish farmers preparing product for marketing. The corixids (water boatmen) are also well known for laying their eggs on freshwater crayfish. Recently, concerns have been raised at potential ecological repercussions of introducing temnocephalid species into regions (including continents) new to the species with live crayfish movements.

 

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