Adult turbot:
Turbot rearing follows a clearly defined sequence:

Hatchery

  • The eggs are fertilized and moved to conical incubation tanks. After 5 days of incubation a larvae about 2.5 mm long hatches.
  • These larvae are seeded in larval tanks where the temperature is controlled. On day 3 artificial feeding with rotifers and artemia begins.
  • Feeding with rotifers and artemia continues until day 30, although by day 25 inert food (micropellets) starts to be added.
  • On day 20 metamorphosis begins. This process involves the migration of the fish’s right eye to the vicinity of the left eye, which will cause the definitive flattening of the juvenile and the movement of the fish to the bottom of the tank, behavior that will continue for the rest of its life.
  • From days 31 to 60 the fish are called juveniles. They are fed with micropellets and weigh around 2 gr.
  • From days 60 to 90 the fish are fed with 1 mm to 2.4 mm pellets and they end up weighing 5 to 7 gr.

Grow-out Process

  • The fish are received in pre-grow out when they weigh 7 gr. The water is kept at room temperature, and they are fed with 2.4mm to 9 mm pellets. When the fish weigh 100 to 150 gr., they are moved to the Grow-out 1 Phase.
  • In Grow-out 1 the fish are seeded in 7.4 m tanks. Feeding is to satiation and consists of 9 mm to 13 mm extruded feed. The fish are held in these tanks until they reach 800 gr.
  • Finally and after continual grading and separation the fish are transferred to 9 m diameter tanks, to a stage called Grow-out 2, where they remain until they reach the commercial size of 1500 gr to 1600 gr. Feeding continues to satiation with 13 mm to 16 mm extruded feed.