About Lesson
Semi-intensive fish farming system
- Involves rather small ponds ( 0.2-0.5 hectares) with higher stocking density ( 7000-10000 fish/ha).
- Care is taken to develop natural foods by fertilization and feeds are supplemented.
- Yield is moderate ( 3-6 tons/ha/year) and survival is high.
Intensive fish farming system
- Well-managed form of fish farming.
- Attempts to achieve maximum production with a minimum quantity of water.
- Very high stocking density ( 10-15 fish/m3 of water).
- Fed on completely formulated feed and natural feed is of minor importance.
- Use of aerators and provided highly nutritious feed.
- Yield is 15-100 tons/ha/year or more.
Advantages
- High production per unit area.
- Permits great control over the size of the fish to be produced.
- Less water surface area is required.
- Less FCR.
- Control of weeds and disease is easier.
- Easy to harvest.
Disadvantages
- High investment per unit area.
- Higher level of management cost
- More risk of oxygen depletion
- More chances of epizootic disease and parasites due to overcrowding.
- Large nutrient load in effluents
- High energy cost
- Risky business
- Skilled manpower is required.
