what physical factors affect the supply and use of fish stocks?

Question 1

fishing defintion

Answer 1

collection of a wide range of species of fish and shellfish

-last large scale human activity

Question 2

fish stocks definition

Answer 2

biomass (weight) of a fish species

Question 3

how are fish stocks added to?

Answer 3

-growth of adult or by young fish joining the population. depleted by deaths or capture

Question 4

when is the stock in equilibrium?

Answer 4

when the end stock has the same biomass as the beginning stock

Question 5

aim of fishing

Answer 5

achieve the highest catch year after year without destroying the equilibrium situation (maximum sustainable yield)

Question 6

Chilean Jack Mackerel-why is the cold ocean current important for accounting concentration of fish stocks in the region?

Answer 6

it uplifts nutrients to the surface, and mackerel wouldn’t swim down as its too dark

Question 7

fish stock biomass defintion

Answer 7

weight of fish species. it differs from spawning biomass as these fish are old enough to reproduce, whereas total includes both juveniles and adults

Question 8

decline in fish stocks in 1990’s

Answer 8

drop in spawning biomass so fish aren’t reproducing leading to a decline in total stocks
-could be due to overfishing