Routine oxygen consumption rates of california halibut (Paralichthys californicus) juveniles under farm-like conditions |
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Authors: | German E. Merino Raul H. Piedrahita Douglas E. Conklin |
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Affiliation: | 1. Nofima, Post box 6122, NO-9291 Tromsø, Norway;2. Faculty of Biosciences, Fisheries and Economy, University of Tromsø, NO-9037 Tromsø, Norway |
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Abstract: | Fish oxygen requirement is a fundamental variable of aquaculture system design and management, as it is the basis for determining water flow rates for sustaining stock. A study on oxygen consumption of California halibut (Paralichthys californicus) between 3.2 and 165.6 g was conducted in small raceways (2.41 m long, 0.28 m wide, and 0.22 m high; operational water depth between 0.05 and 0.10 m with a quiescent zone 19 cm long in the effluent section) working as open respirometers in a recirculating system under farm-like conditions. The fish were fed commercial dry pelleted feeds at a ratio of ~0.70–3.00% of body weight (BW) and stocked at densities between 94% and 316% percent coverage area (PCA). Oxygen consumption rates were determined by mass balance calculations. The mean and maximum oxygen consumption rates (g O2/kg fish/day) for juvenile California halibut under the conditions tested can be expressed by Mday = 15.077W?0.2452 and Mday = 17.266W?0.2033, respectively, where W is fish weight in grams. The determination of oxygen consumption by California halibut in farm-like conditions provides valuable information on the oxygen requirement of these fish in an aquacultural setting. This information can be used for designing and sizing a rearing facility for the intensive culture of California halibut. |
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