Larval release and attachment modes of the hydroid Ectopleura larynx on aquaculture nets in Norway

Carl, Christina, Guenther, Jana, and Magne Sunde, Leif (2011) Larval release and attachment modes of the hydroid Ectopleura larynx on aquaculture nets in Norway. Aquaculture Research, 42 (7). pp. 1056-1060.

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[Extract] In the finfish industry, clean cage nets are essential for the health of the stock (Braithwaite & McEvoy 2005). The accumulation of biofouling, the unwanted attachment of marine organisms on submerged surfaces, decreases the water flow through nets. Subsequently, the water quality within sea cages is reduced, which may affect fish health negatively (Cronin, Cheshire, Clarke & Melville 1999; de Nys & Guenther 2009). Over the last decade, the hydroid Ectopleura larynx (syn. Tubularia larynx) has become one of the most common fouling organisms in the Norwegian fish farming industry, causing increasing problems for farmers (Guenther, Carl & Sunde 2009). The rapid growth of E. larynx on aquaculture nets requires fish farmers to clean their nets regularly, often on a fortnightly basis during the peak of the biofouling season between July and November (Guenther et al. 2009). To reduce biofouling, the majority of Norwegian salmon farmers use copper-based coatings on nets, combined with regular underwater high-pressure washing (200–300 bar) with rotating discs (Olafsen 2006). Anecdotal observations suggest that hydroids grow back faster once the first washing has taken place (B. Jensen, salmon farm manager, pers. comm.).

Item ID: 21699
Item Type: Article (Research - C1)
ISSN: 1365-2109
Keywords: antifouling technologies, biofouling, fish farming, hydroids
Date Deposited: 26 Apr 2012 23:22
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070401 Aquaculture @ 50%
06 BIOLOGICAL SCIENCES > 0699 Other Biological Sciences > 069999 Biological Sciences not elsewhere classified @ 50%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8301 Fisheries - Aquaculture > 830102 Aquaculture Fin Fish (excl. Tuna) @ 50%
96 ENVIRONMENT > 9604 Control of Pests, Diseases and Exotic Species > 960407 Control of Pests, Diseases and Exotic Species in Marine Environments @ 50%
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