Decreases in sealworm (Pseudoterranova sp. (p)) abundance in short-spined sea scorpion (Myoxocephalus scorpius scorpius) following declines in numbers of seals at Hvalseyjar, western Iceland

Abstract.

Larval sealworm [Pseudoterranova sp. (p)] infections were surveyed in the short-spined sea scorpion (Myoxocephalus scorpius scorpius) in the shallow waters of the Hvalseyjar archipelago, western Iceland, in the summers of 1992, 1996 and 1999. Significant decreases in sealworm abundance in 1996 and 1999 were attributed to declines in local populations of grey (Halichoerus grypus) and common (Phoca vitulina) seals, final hosts for sealworm, between 1992 and 1998. The declines of the local seal populations were caused by over-exploitation, disturbances following hunting operation and accidental catch in fishing gear.