Lupin the 3rd

At an auction held by Whitney, owner of a diamond mine, the items scheduled for bidding are stolen by mice and king salmon! Lupin, sensing that there is more to this than meets the eye, follows the salmon, who are migrating via their homing instinct, and ends up in Canada. Whitney, a connoisseur of food, has been using a clever method of circulating his diamonds so that his mine never runs dry.