Fish farming

• What fishes are most commonly fished

  The more commercial species such as salmon and cod
• What are some fishes used for

  To make animal feed
• How do Farmers maximise the amount of good quality of fish

  • suppling the best food and conditions for rapid growth
  • prevention of pests and diseases
  • Control of predators
• What does fish farming look like,

  Fish farming

  
• What are the methods used to maximise food production

  1. Feed regularly with small, amounts of high protein food
  2. Keep predators out by use nets and keeping fish in a cage
  3. Oxygenate water and ensure it is clean and unpolluted by moving the cage to a new area away from waste
  4. Addition of pesticides and fungicides
  5. Separate fish into different age groups and selective breeding
  6. Biological control eg wrasses
• Why is feeding regularly with small amounts of high protein food used

  • high protein food pellets promote rapid growth
  • Regular feeding with small amounts ensures eaten and avoid decaying food ( and therefore bacteria is using up oxygen)
  • Food may also contain antibiotics to kill bacteria and therefore control disease
  • Fish do not have to search for food so energy is conserved
• Which is keeping predators out by nets and keeping fish in a cage used

  • Aerial predators are unable to reach the fish
  • Underwater predators
  • Nets also keep out other fish that would eat the food
• Why is oxygenate the water and ensure it is clean and unpolluted by moving cage to a new area away from waste used?

  • good supply of oxygen for respiration of the fish
  • Limits dead organic matter to prevent bacteria using up all the oxygen
  • Move the cage to new area, away from waste avoids decaying with the bacteria using up oxygen
• Why is the addition of pesticides and fungicides used

  These prevent pests getting out of control

  Fungicides prevent fungal growth
• Why is separating fish into different age groups and selectI’ve breeding used

  • this prevents large fish eating smaller ones
  • Selecting fast growing fish with a high protein level
  • This could also selective bread or genetically be modified for rapid growth
• Why is biological control used

  • small fish can eat up parasites of other fish
  • E.g wrasse is a small fish that eats Luce that are parasites of salmon