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Partner’s activities description

Published by CLR on 2010/2/21 (32357 reads)
1- Partner and lead partner: Bodø University College (BUC)
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Working with reproduction, early development and health issues of Ballan wrasse. Broodstock of Ballan wrasse is established. Photo manipulation of parts of the broodstock for autumn spawning are being established per May 2009. Experimental facilities are established, including live feed department, startfeeding units and tanks for on-growth. Large scale units for startfeeding and weaning of Ballan wrasse are under construction.

2- Partner: Norwegian Institute for Agricultural and Environmental Research –Bioforsk
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In this project, Bioforsk focuses on reviewing the potential of microalgae to reduce the bacterial pressure on Labrus bergylta in captivity. Even though microalgae are widely used in marine fish hatcheries, microalgae have traditionally mainly two applications:
1) feeding and enriching natural zooplankton or cultivated first fodder such as rotifers and Artemia sp., and
2) green water techniques. Algae are often reported as improving larval survival and health. One of the hypotheses is that microalgae lower the number of opportunistic bacteria. In fact, the bacteria / algae interaction is complex. Some types of bacteria and microalgae have symbiotic association and positive effects of microalgae have been identified on the skin and gut microbiota of halibut larvae. Several microalgae species have showed direct anti-bacterial and anti-virus activity. Bioforsk study the interaction between microalgae and bacteria:
1/ to have the possibility to take advantage of the potential antibacterial effect of microalgae on pathogenic bacteria, in order to achieved optimal green water conditions to enhance fish resistance to Aeromonas salmonicida[/a] atypical in [i]Labrus bergylta.
2/ to achieve some understanding of the possible control of bacterial population by using microalgae as green water in production of marine fish larvae.

3- Partner: Viking Fish Farm Ltd
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As an SME with a research capability the organisation will develop hatchery rearing techniques for wrasse (cleaner fish) and then to trial ballan wrasse in salmon cages to determine their lice cleaning ability. The unit is interested in the knowledge generated, and in helping to resolve major ecological and environmental problems within the salmon farming industry in the Northern Periphery region.

4- Partner: Marine Ryan Institute – MRI
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In 2008, work at MRI focussed on WP2 & 3 as per the overall ECOFISH project schedule. In relation to WP2, the acquisition, maintenance and treatment of potential broodstocks is described and the findings of a long-term trial to establish standard and out-of-season spawning groups are reported. While maintaining good condition, these stocks did not spawn and were later destroyed in a catastrophic fire event on site. An allied experiment, examining compensatory feeding behaviour in undernourished adult fish as compared to healthy stocks, similarly, gave positive initial results with significantly higher feeding levels being reported for the undernourished fish. A large number of wild fish of several year classes has been captured in autumn 2008 and a significant experiment to determine feeding behaviour of juvenile fish is being embarked on at present while groups of potential broodstock fish have been established for breeding in the 2009 season. In April and May 2009, wild caught broodfish were successfully spawned and eggs/larvae are being reared at a series of temperatures from 10 to 18oC.

5- Sub-contractor: Daithi O’Murchu Marine Research Station – DOMMRS
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In this project the DOMMRS will carry out ongrowing trials with salmon and wrasse at different densities in sea-based cages. The following parameters will be measured:
Environmental conditions and monitoring: Daily measurements will be taken of the temperature, oxygen and dissolved oxygen.
Welfare monitoring: 1/ Ecto-Parasite load (Number and species of parasites will be counted regularly); 2/ Feed intake measurements/Growth (Feed intake and feeding behaviour is generally considered to be a reliable criteria for evaluation of health and welfare of farmed fish. Fish will be weighed regularly so that the food conversion ratio can be calculated); 3/ Behaviour and fin damage
Aggression is normal fish behaviour, both in nature and aquaculture. Aggression consists of fixed behavioural patterns with threat displays and fights. Chases, nips and attacks will be defined as aggressive acts and the performers and receivers of these acts will be noted. Fin damage or any other lesions will also be noted as either; no damage, mild fin erosion or severe prevalent fin damage; 5/Mucus production (Any excess mucus production on fish will be noted); 6/ Mortality (Mortality of both salmon and wrasse will be noted).
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