Anjova
A predatory fish that grows to about 1 meter long and weighs around 8 kilos, featuring a greenish gray back and silver body. Younger fish usually live in groups, while larger ones are typically solitary (known in English as bluefish, it is common in coastal areas and river mouths in Spain).
He is afraid of the river because he was told there are anjovas.
Automatically translated from Spanish
España