Reviewing 4.3 - Aquatic Food Production Systems (IB ESS)

Identify one reason for the change in the amount of fish consumed between 1950 and 2005.

• Increase in human population

• Decrease in popularity of fish as a source of protein

• Increase in poverty around the world

• Increases in fish populations in both the Atlantic and Pacifici

Identify TWO environmental impacts of intensive capture fisheries.

• Intensive fishing can result in a reduction of natural capital that lowers the capacity of fish stocks to recover.

• Increase in nutrients from feeding the fish can lead to eutrophication (algal blooms).

• Exotic invasive species may escape farms accidentally.

• Some fishing methods can damage marine habitats.

Identify TWO environmental impacts of intensive aquaculture.

• Some species may be caught as by-catch which can have a negative impact on their population.

• Increase in organic sediments from fish waste which can result in reduction of oxygen levels.

• Invasive (exotic) species can escape and compete with local species.

• Reduction in fish stocks can have a detrimental effect on predators of fish caught.

The system shown in image displays some of the inputs and outputs of -

• Open-ocean aquaculture

• Open-ocean intensive harvesting

• Fish farming

• Drift net fishing

Identify TWO harmful outputs of the aquaculture system shown in the image.

• Deposition of waste material

• Escaped fish

• Fish feed

• Sunlight

Identify the type of fishing strategy.

• Purse seine net

• Drift net

• Trawler net

• Gill nets

In which of the following areas are most capture fisheries located?

• Coastal waters.

• Deep ocean waters.

• Lake ecosystems.

• River ecosystems.

Identify the type of fishing strategy.

• Purse seine net

• Drift net

• Trawler net

• Gill nets

Many fish captured by commercial fishing are not meant for human consumption. Fish that is not used for human consumption is used to produce... (Choose 3)

• Fertilizers

• Pet food

• Feed for livestock/aquaculture farms

• Ice cream

• Rubber

Which Fishing technique is considered the most destructive?

• Drift Nets
• Trawling
• Baiting
• Breeding