Biology 1229 Fisheries… or… Should fish be on the menu?

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Presentation transcript:

Biology 1229 Fisheries… or… Should fish be on the menu?

Fish on the menu…  At least 2.5 Billion people depend on fish for more than 20% of the protein in their diet  97 % of fishers are in developing countries

Why might fish be on the list?  Mercury

Why might fish be on the list?  Farming practices unsustainable Shrimp farming in Mexico destroys mangrove forests Salmon farming  Escapes  Parasites  Eutrophication

Why might fish be on the list?  Fishery unsustainable or environmentally damaging Bottom trawling Bycatch from a shrimp net!

Unsustainable fisheries

How does a harvested population work?  Note: “sustainable” is economic, not based on the population!!!  It is possible to derive a MSY from population data using growth rate and harvest rate

Orange Roughy Hoplostethus atlanticus  Slow, ugly, demersal fish (“Slimehead”)  Mature at  Live up to 156 years (depending on who you listen to…)  Harvested by bottom trawling around sea mounts  Fishing, or mining?

How much of the ocean is harvested?

Fishing down the food web

How many fisheries are sustainable?

What about recreational fishing? Commercial Fishery Recreational fishery as a %age of commercial Including menhaden and pollock But the vast majority of several high-value, threatened species (e.g. Red Snapper) are caught recreationally

We are catching too many fish!!

Not just fish suffer…  Effects on seabirds & other top predators  Effects on erosion and flood control (e.g. New Orleans)  Economic effects of fishery collapse (Newfoundland)

Top 20 countries for unsustainable fishing… 1. China 2. Peru 3. Japan 4. Chile 5. USA 18. Canada

What future?  Some authors predict the collapse of ALL fisheries by 2048  Sustainable management is possible… requires Reliable data Reliable fisherman A pretty decent navy  End of oil may result in reduced fishery pressure

Ownership of fisheries prevents collapse Number of Individual transferable quota (ITQ) fisheries With ITQ Without ITQ

See also