Fish farming IGCSE

Fish is a source of which part of the diet?

• carbohydrate

• protein

• lipid

• minerals

What problems have been caused by ocean fishing?

• Overfishing of wild stocks

• Danger to fishers

• bioaccumulation

• death of predators of smaller fish

what percentage of farmed fish is used to make animal feed?

• 10%

• 25%

• 50%

• 75%

Which of the following is a feature of water quality that might be controlled in a fish farm?

• oxygen concentration

• pH

• temperature

• amount of chlorophyll (indicates algal blooms)

How are fish protected from disease in a fish farm?

• antibiotics added to water

• biological control such as sea wrasse to control sea lice

• mercury added to the water

• all of the above

Which factor promotes competition between organisms in an ecosystem?

• cycling of minerals

• limited resources

• decomposition of organic matter

• presence of saprophytes

Competition among members of the same species.

• intraspecific competition

• interspecific competition

Competition between members of different species.

• intraspecific competition

• interspecific competition

Why are fish of different ages placed in separate cages?

• To prevent intraspecific competiton

• To prevent interspecific competition

• To prevent predators reaching them

• To facilitate growth

Why are fish in fish farms places in cages with a cover?

• To prevent intraspecific competiton

• To prevent interspecific competition

• To prevent predators reaching them

• To facilitate growth