Fisheries Examples

Question 1

Witch Flounder

Answer 1

Changes in exploitation rate over time
Age Structure – 34% more were 11 or older, down to 1% 11 or older
Total allowable catch is lowered over time as catches decrease

Question 2

Summer Flounder

Answer 2

Long term potential catch (MSY) = 20 897 mt
Biomass corresponding to MSY = BMSY = 106 444 mt
Minimum biomass threshold = 1/2BSY = 53 222 mt
Actual stock biomass 1999 = 41 400 mt
Fmax = 0.26
F1999 = 0.32
Qutota = 10 000 mt

Question 3

Managing Thresher Shark

Answer 3

Found that less was taken than necesary and thought to be stable
This is a sustainable fishery
There is no population estimate
Calls into question what science there is

Question 4

Global Extraction

Answer 4

~ 20kg/person/year
5.5% of global protein consumption
90% protein in developing countries
1 billion people this is main protein

Question 5

Largest fish group harvest

Answer 5

Clupeiformes (Anchovies), Gadiformes and Scombridae
Most caught

Question 6

Invertebrate Trap Harvest

Answer 6

Lobster and crab harvest is fairly sustainable
Excludes larger size crabs/lobster

Question 7

Artisanal Fisheries

Answer 7

Small-scale commercial extraction
Exploitation rate: 1-5%
Target reproductive capital

Question 8

Canadian Skeena

Answer 8

Overall 3 million loss in dollars every year
These are subsidized by the government
42% sockeye commercially, 7% by First Nations