Destructive Fishing Practices:
Sometimes fishing boats use equipment that does a lot of damage to the environment. Some gear, for example, drags along the bottom and breaks up the entire bottom ecosystem at the bottom of the sea. Even fish that are not caught in the net often loose their places to live or their feeding ground.
During the 45 years this study has been done, several areas have been closed to fishing of any kind. What happens? All kinds of creatures return to the area and are there in high numbers. That means large scale commercial fishing can effect the entire ecosystem. Not just the fish that you catch.