ENVIRON 201 Lecture 19: 19 Oceans and Fisheries
23 Apr 2018
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Outline: oceans basics, geology, chemistry, hydrology, biology, challenges facing our oceans, acidification, coral bleaching, debris, and overfishing. Fisheries and aquaculture: great lakes, case study by april. This 4 c water has the highest density and sinks to the bottom of the lake. As the water becomes colder (<4 c), it becomes less dense and rises to form ice on the surface of the lake. As a result, liquid water always exists in lakes and rivers during the winter months. Longline fishing: focus on maximum sustainable yield, size bias- artificially select for smaller fish by removing large individuals, fishing down the food chain. Marine reserves are a special type of marine protected area (mpa). Size of reserve crucial for conservation efforts: too little and sea life gain little protection, too la(cid:396)ge a(cid:374)d (cid:862)spillo(cid:448)e(cid:396)(cid:863) fo(cid:396) fishi(cid:374)g lost. Results from one to two-year reserves: average densities increased by 91, average biomass increased by.
