The effects of colour and copper on the settlement of the hydroid Ectopleura larynx on aquaculture nets in Norway

Guenther, Jana, Carl, Christina, and Sunde, Leif Magne (2009) The effects of colour and copper on the settlement of the hydroid Ectopleura larynx on aquaculture nets in Norway. Aquaculture, 292 (3-4). pp. 252-255.

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Abstract

In an attempt to find more effective and applied solutions to reduce the settlement of the hydroid Ectopleura larynx on aquaculture nets in Norway, this study determined the settlement preferences of E. larynx with regards to colour and the presence of copper in antifouling coatings. Settlement assays showed that actinulae settled significantly less on white (67.0 ± 5.4%) than on black surfaces (87.0 ± 2.6%), whereas there were no significant differences between the remaining colours yellow, red and blue. However, when given a choice between (1) white and black, (2) red and black, and (3) red and white surfaces, actinulae did not preferentially settle on any colour. A field experiment at a salmon farm in Mid-Norway tested the effects of colour (red and white) and the presence of copper (with and without cuprous oxide) in the coating of net panels on the accumulation of fouling. After 10 weeks of immersion, the only macro-fouling species on the nets was E. larynx. The presence of cuprous oxide significantly reduced the wet weight of fouling, while colour did not have a significant effect. The mean wet weights of fouling on net panels with cuprous oxide coatings (347 ± 25 g m− 2 and 330 ± 19 g m− 2 for red and white nets, respectively) were approximately half of the mean wet weights of fouling on the net panels without cuprous oxide (695 ± 43 g m− 2 and 695 ± 45 g m− 2 for red and white nets, respectively). There were no macro-fouling species present on nets with cuprous oxide coatings, and the wet weights of these nets were only due to absorbed water and sediment.

Item ID: 27211
Item Type: Article (Research - C1)
ISSN: 1873-5622
Keywords: biofouling, fish farming, hydroids, copper, colour, Ectopleura larynx
Date Deposited: 03 Jun 2013 05:57
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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