5.9B: Understand the Methods used to Farm Large Numbers of Fish to Provide a Source of Protein, Including Maintaining Water Quality, Controlling Intraspecific and Interspecific Predation, Controlling Disease, Removing Waste Products, Controlling the Quality and Frequency of Feeding, And Selectively Breeding

FISH FARM: Place where large numbers of fish are commercially bred for consumption

Example:

Image showing an example of fish farm

METHODS OF FISH FARMING:

METHOD	EXPLANATION
MAINTENANCE OF WATER QUALITY	Water is filtered to remove waste and harmful Bacteria to prevent diseases, additionally to maintain high Oxygen levels for aerobic respiration
CONTROL OF INTRASPECIFIC PREDATION	Intraspecific Predation: Competition within the same species Fishes are separated by size and age using nets to prevent intraspecific competition
CONTROL OF INTERSPECIFIC PREDATION	Interspecific Predation: Competition between different species Different species of Fish are separated by fences, nets and tanks to prevent interspecific predation
CONTROL OF DISEASE	Fishes are given antibiotics to increase resistance to diseases and minimise spread of diseases, hence increasing chances of survival
REMOVAL OF WASTE PRODUCTS	Waste products can be removed from Water by several methods: Water can be filtered to remove waste products such as faeces and sewage Fences, nets and tanks can be cleaned to minimise exposure to Waste Location of Fish can be changed to ensure clean Water
QUALITY AND FREQUENCY OF FEEDING	Fishes are fed a nutritious diet in small quantities to ensure growth, while preventing overconsumption or predation
USE OF SELECTIVE BREEDING	Farmers may use selective breeding to only allow fast-growing fishes to reproduce, resulting in a large population of fish