Productivity, diversity and exploitation
9 important questions on Productivity, diversity and exploitation
What are the steps addressing impact of fishing on ecology and stock regeneration?
2. Susceptibility of resource units
3. Selectivity and scale of operation of fishing patterns by resource users
What is the catch-effort curve?
- At any level of fishing effort a yield can be found that is theoretically sustainable and stable with a level where the 'surplus' yield is maximized (MSY)
What are the assumptions of Schaefer model?
- Single species model with man as predator
- Equilibrium between catch and surplus -> Steady state
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In logistic growth, size N depends on
- Intristic grwoth rate (r0) = specific life history character of species = maximum relative growth rate a species can attain at a very low population size
Resource system variation
- long term, inter-annual or seasonal fluctuations (intra-annual variability)
Framework of Regier for classifying dynamics of fish stocks:
- 4 classes
- Fish stocks in stable environment
- One or few fluctuating resources
- Relatively small but numerous resources in stable environments in lakes, reservoirs
- System of small interacting resources that fluctuate erratically in small lakes, pond
What is the fishing down process?
What are the three different classes with different vulnerability?
2. Intermediate susceptible: wide distribution, more resilient, intermediate size, ecologically flexible, unspecialised in food and behaviour pattern and can withstand high natural mortalities. High reproduction rate.
3. Highly resilient species: small pelagic species, high P/B ratio and high natural mortality
What are general the two types of fisheries?
- With multiple types of gears -> Less selective, small-scale fisheries
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