Weirich et al. (1992) reported no osmoregulatory
dysfunction in hybrid white bass x striped bass M. chrysops x M.
saxatilis transported in 8.0 g.l-1 salt added water, contrarily to
what was observed in 1.0, 16.0 and 24 g.l-1. These authors
suggested that 8 g.l-1 is similar to the internal osmotic pressure of
that species, diminishing the ionic gradient between external
and internal environments. This fact allows the fish to save energy
that is used for ion balance during stressful situations. However,
every fish species present a different preference in terms of salinity
and Hattingh et al. (1975) suggested that salt concentrations
between 3 and 7 g.l-1 improve health conditions of several fish
species during transport. The present study showed that 6.0 g.l-
1 of salt can help matrinxã to maintain homeostasis after transport
stress, avoiding energetic spending as observed by the blood
glucose and liver glycogen profiles..