5 Fish Farming PAPER 2 Flashcards

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1
Q

What do farmers feed the fish to promote rapid growth?

A

high lipid and protein food, as well as regular feeding with small amounts so most gets eaten

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2
Q

What are the problems with putting several species in one pond?

A

Interspecific competition: different species will compete for food and some species may be wiped out

Predation: Carnivorous species will prey on other fish

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3
Q

What is the solution to the problems of placing several species in one pond?

A

Place different species in different ponds, tanks, etc.
Use nets to separate species and wild / farmed populations

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4
Q

How can predation from birds be reduced?

A

Placing a cover over the ponds

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5
Q

What are the problems if you put too many individuals in one pond?

A

Intraspecific competition: Larger individuals will out-compete smaller individuals for food or larger individuals may prey on smaller individuals

Infectious disease: Parasites and pathogens spread quick if fish are too close together

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6
Q

What is the solution to the problem of having too many individuals in one pond?

A

Separate fish by age and size
Remove dead or infected fish quickly and add antibiotics to the water to kill bacteria
Add antifungals or chemicals to kill parasites

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7
Q

How do fish farms affect the environment?

A

fish may escape and out-compete or interbreed with local species reducing biodiversity and/or upsetting local ecosystem

Excess feed and waste from fish can cause eutrophication and a reduction in oxygen concentrations in the water (reduced by limiting feed, clearing (vacuuming out) waster and bubbling oxygen through water)

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