Unit 4: Aquaculture - Fish Population Dynamics
- Created by: rosieevie
- Created on: 21-05-15 14:34
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- Fish Population Dynamics - fish is a renewable resource
- Natural breeding rate higher than necessary
- Maximum sustainable yield - greatest amount that can be sustainably harvested
- Requires difficult information to be collected
- Current total biomass
- Annual biomass growth
- Breeding rate
- Survival rates of each age group
- Requires difficult information to be collected
- Over-exploitation of adult fish mean that population may decline as fewer young are produced = complete population collapse
- Doesn't always reduce catch size - lots of juvenile fish caught
- Fish reach catchable size after breeding = no population collapse
- Fish reach catchable size before breeding = population destruction
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