Jessica M. Schulte
Pamela J. Schofield
Viviane Prodocimo
Silvia M. M. Gutierre
2017
<p><span>Specimens of Oscar </span><i>Astronotus ocellatus</i><span><span> </span>from a fish farm were abruptly submitted to salt stress of 14 ppt and 20 ppt, for 3 and 8 h to determine their plasma osmolality. Muscle wet body mass change<span> </span></span><i>in vitro</i><span><span> </span>was analyzed from control freshwater animals. Fish in 14 ppt presented no osmolality distress even after 8 h. In 20 ppt, a slight increase (10%) in plasma osmolality was observed for both times of exposure when compared to control fish. Muscle slices submitted<span> </span></span><i>in vitro</i><span><span> </span>to hyper-osmotic saline displayed decreased body mass after 75 min, and slices submitted to hypo-osmotic saline displayed increased body mass after 45 min when compared to control (isosmotic saline). These results reinforce<span> </span></span><i>A. ocellatus</i><span>’s euryhalinity. The fish were able to regulate its internal medium and tolerate 14 ppt, but presented an intense osmotic challenge and low muscle hydration control when facing salinities of 20 ppt.</span></p>
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10.1080/10236244.2017.1387480
en
Taylor & Francis
Osmoregulation and muscle water control in vitro facing salinity stress of the Amazon fish Oscar Astronotus ocellatus (Cichlidae)
article