Unit 4: Aquaculture - Control of Limiting Factors
- Created by: rosieevie
- Created on: 24-05-15 16:59
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- Control of Limiting Factors
- Temperature - affects productivity and dissolved oxygen levels
- Heating and cooling systems
- Outdoor farms located in warmer or colder areas
- Dissolved oxygen levels - optimised for aerobic respiration
- Water sprays or weirs that agitate the water
- pH - affects solubility of ions
- Lime and pH buffers added
- Ammonia levels - can be toxic and influence pH
- Removal using bacteria
- Water flow rate - high to produce muscular fish and increase stocking densities (swim in same direction)
- Pumps
- Light levels - influences spawning and smoltification (adaption from fresh to seawater)
- Artificial lighting
- Mineral salts or nutrients
- Addition or removal
- Pests, parasites and diseases
- Removing diseased fish
- Antibiotic and pesticide use
- Predation and competition
- Reared in enclosed tanks
- Food availability
- Fed concentrated pellets of specially formulated food
- Temperature - affects productivity and dissolved oxygen levels
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