Fish Farming

Question 1

Method: Biological control organisms

Answer 1

Kills pest species

Question 2

Using nets to cover tanks

Answer 2

Interspecific Predation -> prevents competition

Question 3

Removal of waste products

Answer 3

avoids decomposition by bacteria which use up oxygen

Question 4

Fish bred in small groups

Answer 4

avoids overcrowding for best traits

decreases spread of disease

Question 5

Methods to farm large numbers of fish

Answer 5

• Maintaining water quality
• Controlling intraspecific predation
• Controlling interspecific predation
• Controlling disease
• Removing waste products
• Controlling quality and frequency of feeding
• Selective breeding

Question 6

Method: Maintenance of water quality

Answer 6

• Filtering water - to prevent disease and maintain high O2 concentrations for aerobic respiration

Removing waste products + harmful bacteria - to prevent diseases

Question 7

Method: Controlling Intraspecific Predation

Answer 7

Separating fish by size and age

Question 8

Intraspecific Predation

Answer 8

Predation within the same species

Question 9

Interspecific Predation

Answer 9

Predation between different species

Question 10

Method: Controlling Interspecific Predation

Answer 10

Separating different species using fences/nets/tanks

Question 11

Method: Controlling disease

Answer 11

• Adding antibiotics - to prevent disease (disease can spread quickly due to close confinement)
• Keeping fish in small numbers - to minimise the spread of diseases

Question 12

Method: Removal of waste products

Answer 12

• Filter water to remove waste products (e.g. faeces and sewage)
• Fences/nets/tanks are cleaned
• Location of fish can be changed

Question 13

Method: Quality and frequency of feeding

Answer 13

• Feed fish high nutrient food - for fast growth
• Feed fish frequently + in small amounts - to avoid overeating or start eating eachother

Question 14

Method: Selective Breeding

Answer 14

• Separate fish by gender - so farmers can allow only fish with selective characteristics to reproduce. Ensures fish are fast growing