Developmental stages of turbot larvae (day 1-45), cultured in the Experimental hatchery of Blue Linked (photo: T. Wijgerde).
After a period of 35 days the turbot larvae in the Experimental hatchery of Blue Linked have reached the juvenile stage (fish fry). The fry is now fed exclusively with dry pellets. Also, there are non-controlled, low densities of live zooplankton in the culture system. The usual step in the feeding regime (150-300 micron food pellets) is skipped (see last news item) without noticeable negative effects.
As a result of individual differences in growth rate during the larval stage, cannibalism has been observed. A more precise balance in administring dry food pellets and adjustment of the day- and night cycle can prevent this cannibalism to a large exent in perspective situations.
Soon the fish fry will be transported to another culture system in the hatchery. The next step is to closely monitor the system in which the fry was hatched. It will be obtained whether zooplankton densities will return to the level prior to fish larvae were introduced. We expect to demonstrate the ecological flexibility of the system.
The video(left) shows a fouraging turbot fry (Scophthalmus maximus) in the culture system of Blue Linked.