The bacterial load on surfaces of wooden fish pens was uniformly in excess of 108 per square inch prior to cleaning. Conventional hand scrubbing and rinsing with harbor water failed to reduce the count, whereas the application of a hot jet of detergent followed by rinsing with potable water effected over a 100-fold reduction over most of the hold surfaces. The effect of harbor water versus tap water for rinsing was not studied.

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