Because the fish are now able to swim in deep water, their in shallower water will have less food. Likewise, competition for food among deep-water fish that eat the same types of food will .

Predators, increase

Explanation:

Because the fish are now able to swim in deep water, their Predators in shallower water will have less food. Likewise, competition for food among deep-water fish that eat the same types of food will increase.

Predation is the biological term used to describe the interaction between organisms whereby one  organism which is a Predator kills and devour another organism which is its prey.

In shallow waters, Fishes are more susceptible to predators like man, eagle etc who catch and kill them and  because of that many of these fishes have acquired anti--predator adaptations to prevent being caught and killed and so are now able to swim in deep waters leading to the predators having less food. The fishes who can now swim deep into waters  will increase the already populated deepwater and will cause an increase in competition for the fishes that eat same type of food with the new fishes

the answer will be a) proteins i believe