1 Commercial fishing has had a big impact on the populations of large fish. The numbers of certain fish are declining as a result ef this over fishing. 2. A(n) who eats seafood needs to know which fish are disappearing in order to make responsible eating choices. 3.You should avoid doing things that are harmful to the environment. 4. People who catch just enough fish for their own families have only a effect on the ocean's ecosystem. populations of predator fish. s. Overfishing has led to for Protection of declining fish populations is the health of the oceans. If certain species die out, the ocean's ecosystem will be unbalanced. smaller fish to survive They nee Larger fish the smaller fish for food