A comparison of larval production of the northern scallop,Argopecten purpuratus,in closed and recirculating culture systems |
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| Authors: | Germán Merino Eduardo Uribe Gaspar Soria Elisabeth von Brand |
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| Institution: | 1. Uppsala University, Materials Physics, Ångström Laboratory, Box 516, S-751 20, Uppsala, Sweden;2. National Technical University of Ukraine ‘Kyiv Polytechnic Institute’, Peremogy av. 37, Kyiv, 03056, Ukraine;3. University of Debrecen, Department of Solid State Physics, P.O. Box 2, H-4010 Debrecen, Hungary;1. Universite de Bretagne Occidentale, CNRS/UBO/IRD/Ifremer UMR 6539 Lemar, IUEM, Rue Dumont d''Urville, 29280 Plouzane, France;2. Facultad de Pesquería, Universidad Nacional Agraria La Molina, Av. La Molina s/n, La Molina, Lima, Peru;1. Laboratory of Marine Mollusks, Department of Aquaculture, Federal University of Santa Catarina, Florianópolis, SC 88061-600, Brazil;2. Department of Fisheries and Wildlife, Coastal Oregon Marine Experiment Station, Hatfield Marine Science Center, Oregon State University, 2030, Newport, OR 97365, USA;1. Institute for Applied Ecology New Zealand, School of Science, Faculty of Health and Environmental Sciences, Auckland University of Technology, Private Bag 92006, Auckland 1142, New Zealand;2. Cawthron Institute, Nelson, New Zealand;3. Research Institute for Aquaculture No. 1, Bac Ninh, Viet Nam;1. Laboratory of Marine Mollusks, Department of Aquaculture, Federal University of Santa Catarina, Florianópolis, SC 88061-600, Brazil;2. Department of Fisheries and Wildlife, Coastal Oregon Marine Experiment Station, Hatfield Marine Science Center, Oregon State University, 2030, Newport, OR 97365, USA |
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| Abstract: | Northern scallop Argopecten purpuratus aquaculture relies on an efficient all year-round larval supply. Larvae are generally produced in closed aquaculture systems (CAS) using the batch techniques with periodical water changes. For instance, survival rates are greatly variable and can range from 0 to 80% making production of scallop larvae uncertain. The main goal of this study was to determine the feasibility of rearing scallop larvae in a recirculating aquacultural system (RAS), and secondarily to compare scallop larval growth rate and time length to reach the settling stage when reared with a traditional Chilean CAS technique and in a novel RAS technique in an industrial-like approach.Several batches of larvae were cultured in CAS and RAS. Larvae were fed on Isochrysis galbana cultured in 35-L tubular photobioreactors. Growth rates were significantly different (F11,2840 = 274.66; p < 0.001). All scallop larvae cultured in CAS showed lower growth rates ranging within 4.49 and 7.30 μm day?1 and protracted period of culture until settlement (at least 10 more culture days) than those reared in RAS (growth rates between 9.56 and 13.15 μm day?1). However, final survival (from D-larvae until settlement) of larvae reared in CAS showed higher values than those values recorded for larvae cultured on RAS. Higher growth rates observed in RAS could be attributed to a reduction in daily manipulation of the animals and/or more feed availability as well as higher temperatures and a steady state conditions in water quality. Even though, the reduction in time for rearing larvae until settlement in RAS was high, the comparison between systems is more significant in view of the reduction in make up seawater from 100% of system volume (CAS) to less than 10% of system volume (RAS). Therefore, RAS was independent from daily water quality variation from natural seawater by increasing water retention time, and with that improve water quality steady state conditions. Results of this research show that a more efficient use of water and heating systems than generally used in the Chilean hatchery industry is achievable. This is an important result since it could lead to significant reductions in the cost of operating a scallop hatchery, however further work is required to accurately compare the two systems (CAS and RAS). The main result from this research is that scallop larvae can be cultivated using recirculating aquaculture systems (RAS) as a method to increase production. The information reported in this paper will be useful for the improvement of scallop larvae culture techniques under controlled conditions. |
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