Larval rearing and recirculating systems (RAS)

This is the second phase in hatchery husbandry and its initial success (number of well developed D larvae) is closely related to the preceding step. But, at this stage, larvae are sensitive to bacterial and viral infections if they don't meet the optimal requirements to grow up. Implementation of new methods of rearing can therefore directly contribute to reduce disease related risks. In order to stabilize and increase larval survival, the development of new technologies and its integration into commercial hatcheries must progress. In general, the technology used in bivalve hatcheries has not changed very much since the birth of this industry and still essentially relies on static water methods developed in the 1960s.

 

REPROSEED will develop recirculating systems for oyster, mussel, clam and scallop larvae. For oyster and scallop flow-through techniques are already established. This new system should bring continuously seawater and food and optimize biotic and abiotic environmental components. This should consequently reduce stress and health of larvae. Currently, there are no recirculation systems for bivalve larvae in commercial use. Unfortunately, the amount of water and energy needed is a high drawback to work on.

 

 

Next you are invited to watch algae production in OSTREIRA S.L. hatchery. He is talking about the use of different algae species and their insertion in continuous system for feeding larvae.