EAS 1540 Lecture Notes - Lecture 26: Bottom Trawling, Shrimp Boats, Trawling

• School: Cornell University
• Department: Earth & Atmospheric Sciences
• Course: EAS 1540
• Professor: Bruce Monger

Document Summary

We have the technology: we can now sh anywhere, at any depth, for any species. 90% decline in the top predator sh in the world oceans number of sh caught per 100 hooks set: a proxy indicator for sh abundance. Drift net shing ground line = 2-3 miles. Global fish catch: global fish production 1950-2010, global fisheries subsidies. Bottom trawling: shing method used to collect organisms on or near the sea oor, bottom net dragged: mid water trawling: large net pulled through water column. Shing method used to catch pelagic predators, such as tuna and sword sh uses more than 100km of shing line and thousands baited hooks. 75% of all the ocean sheries are either at their limits or are over shed rise of aquaculture, which provides 25% of global sh production. Sheries subsidies amount to about billion per year. There is also a moral element to over shing: required watching http://ngm. nationalgeographic. com/2007/04/ global- sheries-crisis/ sheries-crisis-interactive.