Turbot is a flatfish that can reach up to 1 meter and can get 25-30 kg with an age of 25 years. Turbot is more and more farmed, that is, grown under controlled conditions.
Recirculation systems means that the water used in the farm is pumped around multiple times and is filtered with biofilters. Water usage is minimised in this way and is a more sustainable way of aquaculture. The water is kept at an optimum for good growth by sampling the water regularly and the monitoring of several parameters.
The ecological effects of the farms score well for turbot, but the feed uses much fish oil and fish meal. Next to that they can make a step towards more sustainability by only using sustainable ingredients for the feed. This is not the standard yet.