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Brazilian Journal of Biology

versión impresa ISSN 1519-6984

Resumen

CARVALHO, YBM.; ROMANO, LA.  y  POERSCH, LHS.. Effect of low salinity on the yellow clam Mesodesma mactroides. Braz. J. Biol. [online]. 2015, vol.75, n.1, pp.8-12. ISSN 1519-6984.  http://dx.doi.org/10.1590/1519-6984.03213.

The aim of this study was to determine the lethal salinity (LC50) for the yellow clam Mesodesma mactroides (Bivalvia: Mesodesmatidae) and identify histopathological alterations that could be used to diagnose structural changes in clam tissue. Clams in two size classes (adults and juveniles) were placed in 10 L chambers and exposed to salinities of 35, 30, 25, 20, 15, 10, and 5 g/L. There were triplicate chambers with seven clams each for each salinity. The LC50 values for a 48 h exposure were 6.5 g/L and 5.7 g/L for adults and juveniles, respectively. For a 96 h exposure, the LC50 values were 10.5 g/L for adults and 8.8 g/L for juveniles. The histological examination of yellow clams exposed to 10 g/L for 96 h showed intercellular oedema and necrotic foci in the epithelium of the digestive gland and occlusion of the lumen of the digestive gland. In conclusion, M. mactroides can be characterised as a moderately euryhaline species, tolerating salinities from 35 to 15 g/L.

Palabras clave : yellow clam; lethal salinity; LC50; histology; extreme southern Brazil.

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