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EcoFish : Embryonic development of Ballan wrasse Labrus bergylta
Posted by CLR on 2011/2/10 5:19:42 (5909 reads) News by the same author

Poster presented at Aquaculture Europe 2010, Porto Portugal.

Authors: D’Arcy, J., Dunaevskaya, E., Treasurer, J., Ottesen, O., Maguire, J., Zhuravleva, N., Karlsen, Å., Rebours, C. & FitzGerald, R.

Full view poster can also be found in the download of www.eco-fish-org and at www.bioforsk.no

The use of wrasse (F. Labridae) as biological cleaner-fish in the control of salmon lice has been demonstrated in a number of studies and they are successfully used on a large scale, with over two million wrasse being caught and stocked annually, in commercial salmon farms in Norway. 

Increasingly, efforts are being made to produce commercial stocks of wrasse for use on farms and an EU Northern Periphery Project entitled "Ecofish" has been established to develop the technologies for spawning and rearing the most promising cleaner fish, ballan wrasse, in captivity with dedicated production hatcheries will be established in Ireland, Norway and Scotland.  This project will also look into the management of ballan wrasse in salmon cages in order to achieve the effective removal of lice. 

As part of the Ecofish work programme, this study examined the embryonic development of Ballan wrasse using material from a series of spawnings in Ireland and Norway. The overall development from fertilization to hatch was monitored and recorded and a standardized series of developmental stages are assigned, from zygote through cleavage, blastulation, gastrulation, segmentation to hatching: each with specific morphological landmarks. This standardization and the synchronization of the developmental stages will facilitate future studies with the species as we may be better able to compare the development rate of different geographic stocks and under different environmental conditions.  The developing embryo was also staged at three different incubation temperatures; 10.5oC, 12.9 oC, and 16.5 oC with 50% hatched occurring at 171, 121 ands 96 hours post fertilisation respectively.

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2011/8/22 3:11:13 - Brochure for AquaNOR 2011
2011/2/10 5:19:42 - Embryonic development of Ballan wrasse Labrus bergylta
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