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Temperate Marine Flatfish - Turbot


The production of Turbot, Scophthalmus maximus, in RAS is fully commercial, with a growing EU industry and demand for this highly prised fish.

At the Llyn Aqua pilot plant in N Wales we have held a breeding stock of selected fish since 2002 and rear about 5 tonnes per annum as a test species to further develop our closed systems. 
Fish of up to 100g are kept in stacked shallow raceway nursery systems (< 10 cm depth) and thrive at up to 25 Kg / m2 and larger fish show optimum growth in shallow (0.3 - 0.7m) round or raceway tanks at densities up to 40 Kg / m2.  Although the fish will tolerate densities of even 60 Kg/m2 we prefer to maintain optimum growth at a lower stocking density.  Shelves within deeper tanks as a means of increasing production have proved NOT to be successful.
In smaller fish FCRs of 0.7 are common, while overall FCR to market size of 1 - 1.5 Kg is around 1.00.  Unstressed, larger fish will remain motionless for 23 hrs and 55 mins per day, only moving once per day to feed!



Large female at spawning time


Juveniles in Shallow Raceway

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