Strategies

Manual Cleaning

Manual cleaning can include brushing or scrubbing. This a simple way to remove fouling and is used on both shellfish and culture trays.

Applicable to:

Shellfish
- Stock and infrastructure.

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Methodology

- Scrubbing and/or brushing.

Key Factors Positive

- Effective against fouling.
- Cheap.
- Needs to be repeated for certain species throughout being reared (e.g. oysters).

Key Factors Negative

- Labour costs are generally high (can be up to 30% of total costs).
- The shell can get damaged during the process, leading to reduced value.
- Mortality of stock may occur during cleaning (anywhere up to 30% of total stock but generally lower than mechanical cleaning).

Cost Benefit

- Contributes to approx. 9% of total person hours.
- Contributes up to 30% of total costs.
- Up to 10% of stock can be lost through the use of the technique.

Conclusions/ Discussion

- The use of manual labour probably represents the strategy resulting in the lowest mortality on stock. However, it is time consuming and with high labour rates can contribute substantially to production costs.

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