Abstract
1. 1. The osmotic adaptations for dehydration of the Chilean clingfish ( Sicyases sanguineus) were examined in emerged fish. 2. 2. Plasma osmolarity, electrolyte levels, body weight changes, hematocrit, muscle water content and urea were measured at various times up to 24 hr of emersion. 3. 3. At 24 hr of emersion, the gut surface of the fish was reddish with engorged capillaries. The concomitant presence of air in the gut suggests a role for the intestine in the air breathing mechanism. 4. 4. S. sanguineus maintained out of water showed a significant loss of body weight and increases in hematocrit values and plasma osmolarity, urea and electrolyte levels.
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