In the ocean this whale population survives for a long period of time
In this environment whales fins are particullary hunted for to make whale fin soup
The blue whales color allows the whales to blend in with the sea easier than the brown whales, causing the brown whales to have their fins cut off more than the blue whale
This causes many brown fish to not get food as well since they can not swim as well
The blue whale mates better with partners who have tailes, thus making blue whales produce more offspring.
This causes the blue whales and their offspring to move to a safer enviornment while the brown whales eventually die off.
