Abstract
Some characteristic properties of vertical fine structure and microstructure in natural waters are surveyed. Ubiquitous thermal microstructure, by its anisotrophy due to shear in the fine-structure gradient layers, is a property that could be used by fishes to orient relative to the local current shear. The geostrophic shear causes a bias in the probability of breaking of internal waves, depending on the direction of wave travel relative to the shear. By this mechanism the direction of major ocean currents may be mirrored in local microstructure. The influence of the fine-structure field on the character of large-scale dispersion of an odorous substance leads to a hypothesized mechanism for olfactory orientation. Some results from ultrasonic tracking of Atlantic salmon and European eels are given to show that fish do perceive and react to vertical fine structure.
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© 1984 Plenum Press, New York
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Westerberg, H. (1984). The Orientation of Fish and the Vertical Stratification at Fine- and Micro-Structure Scales. In: McCleave, J.D., Arnold, G.P., Dodson, J.J., Neill, W.H. (eds) Mechanisms of Migration in Fishes. NATO Conference Series, vol 14. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2763-9_12
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DOI: https://doi.org/10.1007/978-1-4613-2763-9_12
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