none of the above are the impact of fishing on fisheries.
- Fishing gear that is heavy or large can harm the environment while catching fish. Some fishing methods, such as dredging and bottom trawling, impact the sea-floor habitat. In areas with sensitive, bottom-living species, such as deep-sea corals, fishing gear can cause long-term damage.
- Many marine animals that are caught unintentionally by fisheries lack economic value‚ they may be too small to sell legally or are unpopular commercial species. These animals are sorted from the profitable catch and discarded back into the water, often dead or injured. While the populations of these bycatch species may not be threatened, the number of individual animals unintentionally killed can be large in some fisheries, and this impacts the marine food web. Discarding can also occur when fishermen have filled their catch allowance (quota) for a particular species.
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