See if it tastes of salmon Ditch , it could be a grey seal. We had one near us, it used to come up the river every day attacking salmon and seatrout shoals. I remember someone saying while watching it, " I hope that bast*rds next shite is a hedgehog" Up until then, I never knew that they ate hedgehogs , but you live and learn. It lived quite happily for a few months ravaging the local fish stocks, and I assume, hedgehog population, until someone "put it out of it's misery" That'll be the culprit yes indeedy