Cod and related species are plagued by parasites. One of the most interesting is a grotesque and massively modified crustacean, known as the
cod worm (Lernaeocera branchialis). This animal starts life as a small free swimming
larva that is undoubtedly a crustacean. Its first host is the
lumpsucker which it captures with grasping hooks at the front
(
Read more... )