ENVS195 Lecture Notes - Lecture 17: Longline Fishing, Nutrient Pollution, Overfishing
9 Mar 2016
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Document Summary
Oceans and their well-being and intergratable to sustaining life on this planet. They are a key component in global cycles and energy flows. One major difficulty is working against sustainable human use of the oceans is our lack of understanding of oceanic systems (only studied about 10% of the ocean) Set up on continental shelves (coast lines) World"s fishery stock is either at full exploitation, over exploited or has collapsed. Average sizes of fish are also decreasing, because of high mortality rate of fishing that leads to fish reproducing at a younger age and reproducing more off-spring (evolution) Fishing down the food chain (whatever is more profitable) Bycatch: any animals that may be caught and killed accidently when long-line fishing. Oceans are referred to as ultimate pollution sink. Many forms and sources of pollutants and effects. Endocrine disruptors: (soaps, cleaning products) effects reproduction system: nutrient pollution, nutrient enrichment:
