Well, I just think that if we allowed a reasonable harvest, we could keep things in balance.
Also, look at what the sea lions did to the clam population on the Central Coast of California.
Burgeoning sea otter populations are what had a devastating effect on both the abalone fisheries and the Pismo clam populations on the Central Coast. Not sea lions, but sea otters -- sea otters have little paws; they're like hands that give the otters the ability to crack the shells (the use rocks as tools to do it) and dig baby clams out of the sand. Sea lions only have flippers; they eat fish.
Just FYI. :^)