Strategies

Spiky Coatings

A spiky coating with protruding "needles" (0.2 - 2mm) deters certain types of fouling. Special application methods are a prerequisite: apply a glue to the substrate, then apply electrostatically charged fibres.

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Methodology

Coating application is critical and not straight-forward. The substrate is coated with glue, after which the needles are electrostatically charged and fired to the substrate, using a spray gun. The coating makes the net slightly stiff but this can possibly be solved by using a different glue. The fibre coated netting shows highly increased breakage loads (145%) and very similar elongation properties to silicone coated netting.

Key Factors Positive

- Increases strength of netting.
- Effective against some species.

Key Factors Negative

- Currently not in commercial use. It is currently under further research and development.

Cost Benefit

Nets treated with spiky coatings are likely to be higher in cost than copper treated netting, although the system is potentially effective for more than 1 season.

Conclusions/ Discussion

Initial experiments with the first generation of spiky coatings has not shown good results and further testing in CRAB was terminated. However with further work this coating type may show promise. (htm/aquaculture-benefits.htm).

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