GEOG 001 Lecture Notes - Lecture 19: Habitat Destruction, Overexploitation, Ecosystem Services
7 Dec 2020
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Document Summary
Marine pollution can make seafood and shellfish unsafe to eat. Many scientists believe that the more worrisome dilemma is overharvesting. Half of the world"s marine fish population are fully exploited meaning they cannot be. People have always harvested fish, and scientist believe that people began depleting some. Today"s technologies allow fishers to catch fish in large volumes. Factory- fishing: vessels that process and freeze catches while still at sea. Driftnets- nets that span large areas and drift with current targets species that travel in. Longlining- longs lines with several thousand baited hooks- used for tuna and swordfish. Trawling- dragging large cone shaped nets through water- bottom traveling fish. Driftnetting especially catches a substaintial number of non-target species. Scientist conclude that marine communities may have been very different prior to. Emptying the ocean harvested more intensely without being depleted. We have long overfished marine species centuries or millennia ago. Some fishing practices kill non target animals damaging ecosystems industrial fishing.
