Biological Control / Natural Grazers
Other than the marketable stock species, an additional species can be cultured alongside the stock that consumes the undesirable fouling on stock or infra-structure. The CRAB project looked into the use of sea urchins as an example and more details can be found on the research pages or in the Best Practice Guidelines, which can be downloaded from the site. Preferably, this second species is also profitable in the form of a polyculture.
- Grazing and omnivorous species that feed on the species which make up the fouling community are included within the aquaculture infrastructure. Through their actions fouling levels are reduced.
Key Factors Positive
- Environmentally friendly, no chemicals released and no large scale removal of fouling material necessary.
Key Factors Negative
- The levels of fouling reduction can be variable depending on the control species available.
- As yet the benefits in fouling reduction do not translate into a saving from reduced cleaning costs associated with other strategies (see Best Practice Guidelines for more details).
- The experiments from the CRAB project suggest there is potential for this strategy in fouling management.
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