Halibut Fishing:

The oceans around Alaska are a rich and diverse place. The up-welling of nutrients from the ocean floor creates giant blooms of algae. These blooms of algae turn the water a characteristic green color and are food to thousands of smaller animals that drift with the water column like copepods, jellies and many other sorts of plankton. Small fish like the herring feed on these along with larger mammals like the whales. Larger animals feed on these animals and so on up the food chain.

The Halibut that we are fishing for are bottom dwellers and have specially adapted to life in this habitat. They've even gone to the extreme of loosing the pigment on one side of their bodies.