5.9 explain the methods which are used to farm large numbers of fish to provide a source of protein, including maintenance of water quality, control of intraspecific and interspecific predation, control of disease, removal of waste products, quality and frequency of feeding and the use of selective breeding.

On shore & offshore fish tanks

 

Maintenance of water quality –

On land fish farm – maintain O2 levels though pumps,

At sea – doesn’t need pumps to maintain levels (Oxygen maintained by tides)

Both: maintain water, pH, sodium levels

 

Intraspecific predation- (specific to region, closed from the world {eg. school}) within species (cannibalism) / compete for food fish feeds on algae, human fed so it is more controlled – stopped predation by separation by age/size (this way the big fish won’t eat the little fish) – Competition for mates (separation by gender)

 

Interspecific predation- (world wide) Eating other species – easy to stop (by separation)\

 

Control of disease –

  • Antibiotics (too many in one tank = sick anyways)
  • Not overcrowding the tanks

Removal of waste products –

  • Remove CO2
  • Remove excretion  
  • Faeces (It will cause disease)

PREVENTION – on land – pump/filter

   Offshore –  tides remove waste

 

Quality and frequency of feeding:

On shore – fish from the ocean / alt protein source

  • Feed often  (pollutes water) – this increases the nitrogen (killing fish around them)

Offshore –

 

Selective breeding:

  • Selecting characteristics we want from fish eg. breeding of large fish only.
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