15-OcFA11-BioRes_Web

15-OcFA11-BioRes_Web - Biological Resources Biological...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Biological Resources Biological Resources = all the animals and plants harvested from sea, primarily for food. significant proportion of the human population’s protein intake. Fishery = fish caught from the ocean by commercial fishers Commercial fishing is a multi-billion dollar industry the most dangerous job in the U.S. (highest death rate) highly technological equipment employed in ever-increasing effort to catch ever-dwindling resource. Tragedy of the commons”: Free access and unrestricted demand for a finite resource ultimately reduces the resource through over-exploitation, temporarily or permanently -ecologist Garrett Hardin in 1968 -concept for understanding how we have come to be at the brink of -numerous environmental catastrophes -caused by apparently appropriate and innocent behaviors of many individuals acting alone -Ocean is the ultimate ‘common’ property Key Terms: Target Catch - The species of fish or catch that is primarily sought in a fishery (ex. tuna, shrimp, flounders) Bycatch – Caught along with target catch (discarded catch plus incidental catch) Incidental Catch - catch of non-targeted species that is kept Discarded Catch - portion of the catch returned to the sea (economic, legal, or personal considerations). Bycatch mitigation - efforts to make bycatch less severe
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Equipment Driftnets are notorious for their bykill of turtles, seals, dolphin and everything else Trawling : Conical nets Can trawl at surface, mid-depth, bottom (highly disruptive of benthic environment) Shrimp trawlers are wasteful produce 2 % of the world’s seafood responsible for 33% of the bycatch and bykill. 14 pounds of fish and other marine life destroyed for 1 pound of shrimp harvested. Shrimp trawlers kill more turtles than all other human means combined in US waters Long-lining - Up to 10’s of km with thousands of baited hooks (targets swordfish, tuna) - Also catches sharks, marine birds and mammals - In Gulf of Mexico more that half of catch is thrown back, 65% of these die.(this includes 50% of swards that are returned because too small, 77% die) Purse Seine : net is released behind a boat, usually in a circle several hundred meters across. Two net ends are brought together onto the boat., Catches everything
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 7

15-OcFA11-BioRes_Web - Biological Resources Biological...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online