Salmon

The salmon is a fish you catch where the river meets the sea. Look for a large shadow. In the northern hemisphere look for it in Sep, at any time of day. Nook's Cranny pays 700 Bells, C.J. pays 1,050 Bells.

Appears only at the river mouth, and only for one month a year. It is very common there, so a short session should land one, and the same spot hides the rarer king salmon.