5 Fish Farming PAPER 2

Question 1

What do farmers feed the fish to promote rapid growth?

Answer 1

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

Question 2

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

Answer 2

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

Predation: Carnivorous species will prey on other fish

Question 3

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

Answer 3

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

Question 4

How can predation from birds be reduced?

Answer 4

Placing a cover over the ponds

Question 5

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

Answer 5

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

Question 6

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

Answer 6

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

Question 7

How do fish farms affect the environment?

Answer 7

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)