Temperature and velocity microstructure caused by swimming fish1

Abstract

Simultaneous acoustic and microstructure measurements obtained from a submarine showed a rapid increase in turbulent dissipation coincident with its passage through water vacated by a school of fish. The effect is attributed to the wake left by part of the school as it moved out of the submarine’s path. Avoidance behavior of this type also occurs in the vicinity of free‐fall microstructure probes; it is suggested that microstructure profiles may include such biological sources of turbulence when taken in waters having substantial aggregations of fish.