Fisheries (Exotic Fish, Fish Farming and Fish Diseases) - South
Biology 1229 Fisheries… or… Should fish be on the menu?
-
Upload
victor-farmer -
Category
Documents
-
view
228 -
download
0
description
Transcript of Biology 1229 Fisheries… or… Should fish be on the menu?
![Page 1: Biology 1229 Fisheries… or… Should fish be on the menu?](https://reader035.fdocuments.net/reader035/viewer/2022081507/5a4d1acb7f8b9ab05996fa26/html5/thumbnails/1.jpg)
Biology 1229Fisheries…
or… Should fish be on the menu?
![Page 2: Biology 1229 Fisheries… or… Should fish be on the menu?](https://reader035.fdocuments.net/reader035/viewer/2022081507/5a4d1acb7f8b9ab05996fa26/html5/thumbnails/2.jpg)
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
![Page 3: Biology 1229 Fisheries… or… Should fish be on the menu?](https://reader035.fdocuments.net/reader035/viewer/2022081507/5a4d1acb7f8b9ab05996fa26/html5/thumbnails/3.jpg)
Why might fish be on the list?Mercury
![Page 4: Biology 1229 Fisheries… or… Should fish be on the menu?](https://reader035.fdocuments.net/reader035/viewer/2022081507/5a4d1acb7f8b9ab05996fa26/html5/thumbnails/4.jpg)
Why might fish be on the list?Farming practices unsustainable
Shrimp farming in Mexico destroys mangrove forests
Salmon farming Escapes Parasites Eutrophication
![Page 5: Biology 1229 Fisheries… or… Should fish be on the menu?](https://reader035.fdocuments.net/reader035/viewer/2022081507/5a4d1acb7f8b9ab05996fa26/html5/thumbnails/5.jpg)
Why might fish be on the list?Fishery unsustainable or
environmentally damaging
Bottom trawling
Bycatch from a shrimp net!
![Page 6: Biology 1229 Fisheries… or… Should fish be on the menu?](https://reader035.fdocuments.net/reader035/viewer/2022081507/5a4d1acb7f8b9ab05996fa26/html5/thumbnails/6.jpg)
Unsustainable fisheries
![Page 7: Biology 1229 Fisheries… or… Should fish be on the menu?](https://reader035.fdocuments.net/reader035/viewer/2022081507/5a4d1acb7f8b9ab05996fa26/html5/thumbnails/7.jpg)
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
![Page 8: Biology 1229 Fisheries… or… Should fish be on the menu?](https://reader035.fdocuments.net/reader035/viewer/2022081507/5a4d1acb7f8b9ab05996fa26/html5/thumbnails/8.jpg)
Orange RoughyHoplostethus atlanticus Slow, ugly, demersal fish
(“Slimehead”)Mature at 20-30Live up to 156 years (depending
on who you listen to…)Harvested by bottom trawling
around sea mountsFishing, or mining?
![Page 9: Biology 1229 Fisheries… or… Should fish be on the menu?](https://reader035.fdocuments.net/reader035/viewer/2022081507/5a4d1acb7f8b9ab05996fa26/html5/thumbnails/9.jpg)
How much of the ocean is harvested?
![Page 10: Biology 1229 Fisheries… or… Should fish be on the menu?](https://reader035.fdocuments.net/reader035/viewer/2022081507/5a4d1acb7f8b9ab05996fa26/html5/thumbnails/10.jpg)
Fishing down the food web
![Page 11: Biology 1229 Fisheries… or… Should fish be on the menu?](https://reader035.fdocuments.net/reader035/viewer/2022081507/5a4d1acb7f8b9ab05996fa26/html5/thumbnails/11.jpg)
How many fisheries are sustainable?
![Page 12: Biology 1229 Fisheries… or… Should fish be on the menu?](https://reader035.fdocuments.net/reader035/viewer/2022081507/5a4d1acb7f8b9ab05996fa26/html5/thumbnails/12.jpg)
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
![Page 13: Biology 1229 Fisheries… or… Should fish be on the menu?](https://reader035.fdocuments.net/reader035/viewer/2022081507/5a4d1acb7f8b9ab05996fa26/html5/thumbnails/13.jpg)
We are catching too many fish!!
![Page 14: Biology 1229 Fisheries… or… Should fish be on the menu?](https://reader035.fdocuments.net/reader035/viewer/2022081507/5a4d1acb7f8b9ab05996fa26/html5/thumbnails/14.jpg)
Not just fish suffer…Effects on seabirds & other top
predatorsEffects on erosion and flood
control (e.g. New Orleans)Economic effects of fishery
collapse (Newfoundland)
![Page 15: Biology 1229 Fisheries… or… Should fish be on the menu?](https://reader035.fdocuments.net/reader035/viewer/2022081507/5a4d1acb7f8b9ab05996fa26/html5/thumbnails/15.jpg)
Top 20 countries for unsustainable fishing…1. China2. Peru3. Japan4. Chile5. USA
18. Canada
![Page 16: Biology 1229 Fisheries… or… Should fish be on the menu?](https://reader035.fdocuments.net/reader035/viewer/2022081507/5a4d1acb7f8b9ab05996fa26/html5/thumbnails/16.jpg)
What future?Some authors predict the
collapse of ALL fisheries by 2048Sustainable management is
possible… requires Reliable data Reliable fisherman A pretty decent navy
End of oil may result in reduced fishery pressure
![Page 17: Biology 1229 Fisheries… or… Should fish be on the menu?](https://reader035.fdocuments.net/reader035/viewer/2022081507/5a4d1acb7f8b9ab05996fa26/html5/thumbnails/17.jpg)
Ownership of fisheries prevents collapse
Number of Individual transferable quota (ITQ) fisheries
With ITQ
Without ITQ
![Page 18: Biology 1229 Fisheries… or… Should fish be on the menu?](https://reader035.fdocuments.net/reader035/viewer/2022081507/5a4d1acb7f8b9ab05996fa26/html5/thumbnails/18.jpg)
See also
http://www.mbayaq.org/cr/seafoodwatch.asp