Tests were conducted to determine the tolerance of mussels of the genus Mytilus to immersion in fresh water at ambient temperatures and in sea water at elevated temperatures. It was found that young bay mussels, which constitute the most serious sedentary fouling organisms in local sea conduits, may be killed in about 50 minutes at 106 F, in an hour at 100 F, in 7 hours at 95 F, and within 14 hours at 90 F. They may survive for as long as four days at 82 F and indefinitely at 77 F.

Tests results indicate that it is impractical in most cases to apply fresh water as a lethal agent for the mussels in sea water conduits. A countermeasure found to be effective was the discharge of warm sea water through conduits. 3.3.2

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