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.
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