Abstract
The gills of fresh water teleosts function as the primary site for the active absorption of ions from the external media and for the respiratory exchange of gases. Because of the low solubility of oxygen in water large amounts of water must be passed over the gills to meet the oxygen demands of the fish (RAHN 1966) consequently when fish are in contaminated waters their gills can be exposed to large amounts of water soluble pollutants (e.g. methyl mercury). HANNERZ (1968) and RUCKER and AMEND (1969) have shown that mercury is concentrated in gill tissue up to several thousand times the level found in the media. It was therefore the intent of the present investigation to determine if methyl mercury has any effect on the metabolism or physiological function (plasma electrolyte regulation) of the gill.
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