Either there is not enough caviar for everyone, or fishing is more fun that digging for the bears too, but most bears are on the river for salmon, not for its eggs.
That late, the salmon run is almost over, and the fish is very slow and sleepy. No need to catch it anymore - just walk up and hook with the claws.
Page 8: Gone Fishing
Стр. 8: Медведь-рыболов