Narrowing the Range of Environmental Salinities Where Juvenile Meagre (Argyrosomus regius) Can Be Cultured Based on an Osmoregulatory Pilot Study
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ID: 110671
2018
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Abstract
Aquaculture in Europe aims to diversify and optimize fish farming. The meagre (Argyrosomus regius) arose as a promising species due to its fast growth rates and flesh quality. Thus, it is currently being produced in several Mediterranean countries, mainly in sea-cages and salt-marshes. However, although meagre naturally spend the first years of life in brackish waters, to date it is cultured in seawater. Here, we show that juveniles may not successfully face either freshwater or hyper-osmotic environments as high as 55 ppt salinity. We found that 55 ppt induced catabolism and mobilization of energy metabolites stored in the liver, probably to maintain its osmotic balance. Furthermore, we found that osmoregulatory tissues such as gills managed to maintain plasma osmolality levels without differences in meagre acclimated at 5, 12 and 39 ppt salinity. Our results demonstrate the euryhaline capacity of this species, highlighting that juveniles may be cultured in a wider range of salinities rather than just at seawater. Future studies should focus on optimal environmental salinities for the growth of A. regius juveniles, including long-term experiments limited to the range of 5 ppt to full-strength seawater. Minimizing fish energy consumption in osmoregulation could be economically beneficial for the aquaculture industry in Europe.
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ruiz-jarabo2018fishesnarrowing
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| Authors | Ignacio Ruiz-Jarabo;Pura Márquez;Luis Vargas-Chacoff;Juan Antonio Martos-Sitcha;Salvador Cárdenas;Juan Miguel Mancera;Ruiz-Jarabo, Ignacio;Márquez, Pura;Vargas-Chacoff, Luis;Martos-Sitcha, Juan Antonio;Cárdenas, Salvador;Mancera, Juan Miguel; |
| Journal | fishes |
| Year | 2018 |
| DOI |
10.3390/fishes3040048
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| URL | |
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