Local fishermen were concerned after 'thousands and thousands' of small fish were washed up dead on Benar Beach near Barmouth, Gwynedd.
A father of seven died 'rescuing three of his children' when they got into difficulty in the sea. Jonathan Stevens was with his family at Barmouth beach when they began to struggle in the water at lunchtime on Sunday.
An officer from Barmouth is commemorated among the heroes of the Titanic, which sank 100 years ago today.