Abstract
Results of an earlier study [Clark et al., J. Acoust. Soc. Am. 100, 2709(A) (1996)] suggested that low-frequency vibrations could have a positive effect on the growth rate of fingerlings grown in tanks. This talk describes a more extensive study with a larger sample of fish (640 Tlapia Nilotica grown in four control tanks and four treated tanks) for a longer period of time than the previous six week period. The control tanks were mildly acoustically quieted with foam rubber tank coatings that are normally applied to reduce heat conduction into the tanks. The treated tanks were excited continuously with shakers in the frequency range of 30–60 Hz for the duration of the test. Average weight and length versus time for fish in treated and control tanks were measured at 3 week intervals. Differences in the two groups and their possible causes are discussed.
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