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The Effects of Aquaculture Production Noise on the Growth, Hearing, Disease Resistance, and Survival of Rainbow Trout (Oncorhynchus mykiss) and Methods for Minimizing Noise in Fiberglass Aquaculture Tanks John W. Davidson III Intensive aquaculture systems, particularly recirculating systems, often require noise producing equipment such as pumps, blowers, and filters that inadvertently increase sound levels within the culture environment. These systems are often very effective at culturing healthy, fast growing fish; however, the potential impacts of underwater noise on fish within intensive aquaculture systems have not been evaluated. Limited research suggests that subjecting fish to noise could result in impairment of the auditory system, reduced growth rates, and increased stress. The studies presented within this manuscript were conducted to gain a better understanding of aquaculture production noise and its potential impacts on rainbow trout growth, survival, and physiology. Chapter 1. The objective of this study was to evaluate practical structural changes (retrofits) to reduce underwater noise within fiberglass fish culture tanks. Retrofits eliminated contact between PVC piping and tank surfaces and buffered sound transmission into tanks using insulated materials. Each retrofit contributed to a reduction of underwater sound. As retrofits were combined, a cumulative four-fold reduction in sound level was observed. Sound frequency spectra also indicated that nearby pumps and blowers created tonal frequencies that were transmitted into the tanks. The tank modifications used during this study were simple and inexpensive and could be applied to existing systems and designs. Optimal retrofits were applied to tanks used in subsequent studies to create “quiet” control tanks.

The effects of aquaculture production noise on the growth, hearing, disease resistance, and survival of rainbow trout (Oncorhynchus mykiss) and methods for minimizing noise in fiberglass aquaculture tanks