Oxygen consumption of the dogfish gill tissue following zinc treatment.

1. Oxygen consumption of the dogfish gill tissue has been determined by manometric techniques following different treatments with zinc sulphate. 2. Exposure of the animals to subacute and acute zinc concentrations affects gill tissue respiration. 3. No significant differences in oxygen consumption were found between subacutely treated fish (10 ppm for 4 and 21 days) ad 80 ppm (LC50 48hr) for 24hr exposed animals. 4. Fish treated with 175 ppm (LC50 24hr) for 14 hr greater inhibition of gill tissue respiration than subacutely treated animals. 5. Results are discussed in relation to Zn accumulation in the gill system following the same treatment with zinc sulphate.