Quiz 5: Overfishing and Aquaculture

What makes trawling, longlines, and purse seine fishing techniques that are unsustainable? Pick all correct answers.

- They can take too many fish
- Some of these techniques damage the seafloor
- These techniques are too expensive
- Bycatch is a problem

- They can take too many fish
- Some of these techniques damage the seafloor
- Bycatch is a problem

How does Fishing Down the food web affect fish ecosystems? Pick all correct answers

- It makes sharks overpopulated
- It results in a shorter food chain
- It causes fish to migrate to cooler waters
- It results in the food web being out of balance

- It results in a shorter food chain
- It results in the food web being out of balance

Why is using fish for fish meal for aquaculture a problem?

- Because it shortens the food chain
- Because it still takes fish from the oceans and is inefficient
- Because salmon do not like to eat fish meal
- Because fish meal is too expensive

Because it still takes fish from the oceans and is inefficient

Which on the following list are things that we can do to change the future of fishing, to prevent overfishing? Pick all correct answers

- Farm herbivorous fish
- End government subsidies
- Establish Marine Reserves
- Eliminate/reduce bycatch

- Farm herbivorous fish
- End government subsidies
- Establish Marine Reserves
- Eliminate/reduce bycatch

What happened to the Cod fishing industry in the US and Canada (on the Grand Banks and off Newfoundland)? Pick all correct answers

- Total collapse of fishery because of overfishing
- Escape of cod from fish farms destroyed the native cod population
- Government subsidies helped stock more cod
- Moratorium on cod fishing starting in 1992

- Total collapse of fishery because of overfishing
- Moratorium on cod fishing starting in 1992

What what market developments and what fishing techniques or equipment contributed to overfishing of cod? Pick all correct answers

- Factory ships
- Sonar
- bycatch
- Frozen food industry

- Factory ships
- Sonar
- Frozen food industry

What is the status of the Bluefin tuna population and why?

- At about 50% of original population because of demand for sushi in japan
- Overfished to supply canned tuna
- Down to about 15-20% of original population because of demand for sushi in japan
- The population is so low from overfishing that Bluefin tuna is on the endangered species list

Down to about 15-20% of original population because of demand for sushi in japan

How much of the fish eaten in the US comes from aquaculture?

- One tenth
- About one-quarter
- About one-half
- 90%^

About one-half

What are the roles of wild fish in fish farming? Pick all correct answers

- wild fish provide trophies while farmed are food
- provide pens for fish farms
- To make fish meal to feed fish on farms
- To provide eggs or young to grow on farms

- To make fish meal to feed fish on farms
- To provide eggs or young to grow on farms

How can escaped fish from fish farms be a problem? Pick all correct answers

- They interbreed with wild population
- They compete with wild population for food and habitat
- They spread disease to wild population
- They can feed the wild population

- They interbreed with wild population
- They compete with wild population for food and habitat
- They spread disease to wild population

How can aquaculture negatively affect coastal areas? Pick all correct answers

- Loss of income for coastal dwellers
- building fish farms can lead to loss of coastal wetlands like mangroves
- Can cause pollution of coastal waters
- Catching wild fish for farming depletes the coastal fish population

- building fish farms can lead to loss of coastal wetlands like mangroves
- Can cause pollution of coastal waters

What can we do to make sure aquaculture is done sustainably? Pick all correct answers

- Use sustainable feed
- Reduce Pollution
- Protect habitat
- Use Fishmeal feed

- Use sustainable feed
- Reduce Pollution
- Protect habitat