Raceway culture

• Defined as raising of fish in running water.
• High production system in which fish are grown in higher stocking density.
• An abundant flow of good quality, well-oxygenated water is essential to provide the respiratory requirements of high-density fish to flush out the metabolic wastes from fish and feed.
• There are two types: a linear type with ponds arranged in sequence and a lateral type with ponds laid out in parallel.
• The most preferred species is rainbow trout.

Raising rainbow trout in raceway culture

• Clean and cold water is essential for trout culture.
• Water temperature must be 10-20⁰C but the optimum for best growth is 15-18⁰
• Has dissolved oxygen level ≥8 mg/L.
• The appropriate water depth is 60-90 cm.
• Stocking density varies from 50-100 fry/m².
• Generally, 35-40% CP is necessary for trout fish.
• Young trout (<30 g) needs to feed 3-10 % of body weight per day where 1-2% is sufficient for bigger ones.
• Thin out and grading the stock is done to reduce cannibalism.
• Reach marketable size (200-300 g) within 12-14 months from free-swimming larvae.
• Production varies from 100-200 metric tons per hectare per year.