SIO 132 Lecture Notes - Lecture 17: Patagonian Toothfish, Atlantic Cod, Maximum Sustainable Yield
31 Aug 2018
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Document Summary
Brief overview of world fisheries - once thought to be essentially inexhaustible, modern technology and markets have pushed many fisheries into serious decline: a. Most productive areas are the continental shelves of the north atlantic and north. Pacific, the upwelling coast of western south america, and off japan: 2. Deep water is less productive and harder to fish: 3. Major offshore fisheries are tuna (and historically, whales: b. Fish: herrings sardines and anchovies - small pelagics feeding at low trophic levels. Greatest biomass, low value as human food: b. cod and relatives - bottom dwelling, feed high in the food chain. cold water, mackerels and tuna - temperate and tropical. Tunas- among the largest fish involved in commercial fisheries and some can bring >,000/fish: d. flatfish - halibut, flounder - premier food fish. Invertebrates: crustaceans - crab shrimp and lobster, b. Mollusks - snails, abalone, clams, mussels, squid, octopus: c. fishing methods, 1.
