Topic24-humanimpactfisherie_Revised

Topic24-humanimpactfisherie_Revised - Food from the Sea...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Food from the Sea Chapter 11
Background image of page 1

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

View Full DocumentRight Arrow Icon
Human Impacts on Fisheries Substantial human impacts due to overfishing, eutrophication and pollution on ocean biota Food from the sea worth $55 B in 1995 1% of human food consumption but 10% of the protein Used for human, pet and animal food, fertilizer and industry
Background image of page 2
Fishing Techniques
Background image of page 3

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

View Full DocumentRight Arrow Icon
Fisheries include: Clupeids anchovies, herring, menhaden #1 in tons Shallow continental shelf fishery Phytoplankton feeders Large purse seines used Fish meal and fertilizers
Background image of page 4
Gadoids: cod, pollock, hake #2 in tons Bottom-dwelling predators Continental shelf and shallow coastal waters Bottom trawls Used in fish burgers and artificial crabmeat
Background image of page 5

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

View Full DocumentRight Arrow Icon
Tuna and mackerels: # 3 or #4 in tons Top carnivores in oceanic food webs with 7-8 trophic levels below them Active, cruising fishes that prey on clupeids Purse-seine and long-line fishery Human consumption
Background image of page 6
Salmonids Facts # 3 or # 4 in tons Top carnivores in oceanic food webs with 5-6 trophic levels below them Anadromous – fish spawn in fresh water
Background image of page 7

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

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 41

Topic24-humanimpactfisherie_Revised - Food from the Sea...

This preview shows document pages 1 - 8. Sign up to view the full document.

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