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The effect of arsenic on the thermal tolerance of newly hatched muskellunge fry ( Esox masquinongy)
Journal article   Peer reviewed

The effect of arsenic on the thermal tolerance of newly hatched muskellunge fry ( Esox masquinongy)

Frank V. Paladino and James R. Spotila
Journal of thermal biology, v 3(4)
01 Jan 1978
DOI: https://doi.org/10.1016/0306-4565(78)90024-4

Abstract

arsenic Critical Thermal Maxima Esox masquinongy fry sodium arsenite swim-up Thermal tolerance toxicity
1. 1.The temperature tolerance, Critical Thermal Maxima (CTM), was significantly reduced when newly hatched muskellunge fry were reared in tanks containing 0.05, 1.0 and 5.0 ppm arsenic as sodium arsenite (NaAsO 2). 2. 2.During swim-up (days 8–14 post hatch), CTM decreased from 32.5°C, 30.5°C for fry exposed to 0.05 ppm As. from 32.2°C to 30.°C for fry in 1.0 ppm As and from 31.3°C to 29.3°C for fry in 5.0 ppm. The CTM for the fry exposed to As remained depressed from the onset of swim-up until the experiment was terminated. 3. 3.The control group also displayed a drop in CTM during swim-up from 32.4°C to 30.3°C but the CTM then slowly recovered and increased to 31.8°C on day 15. 4. 4.Swim-up began in all tanks on day 8 and was accompanied by a rapid increase in mortality in those fry exposed to As. 50% mortality was reached 2 days after swim-up began at 5.0 ppm As, 4 days after swim-up began at 1.0 ppm and 5 days after the onset of swim-up for 0.05 ppm. All fish exposed to As died within 7 days after the onset of swim-up. 5. 5.Control fish completed swim-up in 3 days (11 days after hatching), began to feed and appeared normal.

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