Impact of fish feed on airlift pumps in aquaculture systems |
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| Institution: | 1. Department of Mechanical Engineering, LeTourneau University, 2100 Mobberly Ave, Longview, TX 75602, USA;2. Environmental and Fisheries Sciences, Northwest Fisheries Science Center, National Marine Fisheries Service, NOAA, 2725 Montlake Blvd. East, Seattle, WA 98112, USA;1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;2. Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China;3. School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China;1. Fachbereich Technik, Fachhochschule Westküste, 25746 Heide, Germany;2. Gesellschaft für Marine Aquakultur, Hafentörn 3, 25761 Büsum, Germany;3. Institute of Animal Breeding and Husbandry, Christian-Albrechts-Universität zu Kiel, Hermann-Rodewald-Straße 6, 24118 Kiel, Germany;4. Thünen Institut für Fischereiökologie, Wulfsdorfer Weg 204, 22926 Ahrensburg, Germany;1. Department of Biological and Environmental Engineering, Cornell University, Riley-Robb Hall, Ithaca, NY 14853, USA;2. The Conservation Fund, Shepherdstown, WV 25443, USA;1. Division of Marine Bioscience, College of Ocean Science and Technology, Korea Maritime and Ocean University, Busan 606-791, Republic of Korea;2. Inland Research Institue, National Institute of Fisheries Science, Changwon 51688, Republic of Korea |
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| Abstract: | Airlift pumps are commonly used in aquaculture systems to circulate water and maintain critical gas levels. In production marine reuse systems, a significant decrease in airlift pump flowrate was visually observed immediately after feeding. In experimental systems without fish, it was found that feed additions of less than 10 mg/L decreased water flow by as much as 78% for diffuser injectors but only 10% for pumps with direct air injection. For both injector types, feed impact diminished over several hours but persisted longer in seawater than in freshwater. Video footage revealed increasing bubble coalescence with the addition of feed. The decrease in pump flow is likely attributed to water property changes due to compounds leaching out of the feed. This decrease in pumping rate has the potential to negatively impact water quality, system performance, and fish health. |
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| Keywords: | Airlift pump Pumping efficiency Bubble size Impact of feeds |
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