Adult bass is an inshore species that can be found in the surf zone, around outcrops of rocks, and in shallow coastal waters. These fresh water visits are not limited to juveniles only. Thus it is no surprise that juvenile sea bass regularly can be found in the fresh water of river mouths. These salt levels are so low, that the water can almost be considered fresh.
Young bass inhabit waters of 0.24-0.37% salinity where they feed mainly on zooplankton.
Especially juvenile bass can cope with low salinity very well. Sea bass has a high tolerance to salinity changes: the species endures salt levels from 0.5 to 40‰. These sheltered habitats where the juveniles mature are nevertheless not purely salt or brackish. Juvenile bass aggregate in brackish estuarine nursery areas where they usually remain until their second summer. This is a result of the fact that bass has a high tolerance to salinity changes.Īfter spawning has taken place at sea, the growing sea bass larvae drift from the open sea inshore towards the coast and eventually into creeks, backwaters, and estuaries.
At some spots anglers regularly catch sea bass and fresh water species like zander in the mix. All rights reserved.Although (sea) bass is predominantly a marine fish, it is also possible to encounter Dicentrarchus labrax in fresh water. Transfer to FW was followed in gills by an increase in alpha 1 and alpha 4 Na+/K+-ATPase levels in FWS and FWU, supporting the current model of ion absorption through the gills. AQP3 transcript levels in gills were higher in FWU than in FWS, suggesting an increase in gill water permeability or other solutes. AQP3 transcript levels in gills were higher in FWS compared to SWS, suggesting a role in FW adaptation. In FWU, AQP1 transcript levels in the digestive tract were higher than in FWS, suggesting higher water absorption. AQP1 was highly expressed in SWS digestive tract and kidney, suggesting its involvement in water absorption. In order to explore this condition, we have studied the changes of aquaporins (AQP1 and AQP3), alpha 1 and alpha 4 Na+/K(+-)ATPase transcript levels in the digestive tract, kidney and gills after a long-term exposure of juvenile sea-bass to sea water (SW) and FW fish able to survive in SW and FW are called SW-adapted fish (SWS), FW successfully-adapted fish (FWS) respectively, while fish that die in FW are called FW unsuccessfully-adapted fish (FWU). Changes in water permeability of different osmoregulatory tissues could be the cause of reduction in blood osmotic pressure and death in some fish in fresh water (FW). Sea-bass (Dicentrarchus labrax) grow under different salinity regimes, from the open sea to lagoons and even rivers, but some mortality has been recorded in juvenile stages when exposed to low salinity water. Salinity adaptation, Juvenile sea bass, Differential mortality, Alpha 4 Na+/K+ ATPase, Alpha l Na+/K+ ATPase, AQP3, AQP1 Giffard Mena I 1, Lorin Nebel C 2, Charmantier G 1, Castille R 1, Boulo Viviane 3ġ : IFREMER, Univ Montpellier 2, UMR5119-UM2-CNRS-IFREMER, Ecolag, RIAE Team, F-34095 Montpellier 05, France.Ģ : Vanderbilt Univ, Med Ctr, Dept Anesthesiol, Nashville, TN 37232 USA.ģ : Univ Montpellier 2, IFREMER, CNRS, UMR UM2 5119,RIAE Team, F-34095 Montpellier 05, France.Ĭomparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology (1095-6433) (Elsevier), 2008-07, Vol. Adaptation of the sea-bass (Dicentrarchus Labrax) to fresh water: Role of aquaporins and Na+/K+-ATPases Type
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