Abstract
Juvenile planehead filefish,Monocanthus hispidis, were collected from the Westport River, a southern New England estuary, during September and October of 1971. The critical thermal minimum of filefish acclimated to 15 C was found to be 8.70 C. The mean lower lethal temperature of these fish was 5.63 C. It is suggested that these fish do not escape northern waters before cold temperatures overtake them in the fall.

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