Fish movement vectors and the temperature gradient: A geometric analysis method for the depth–temperature time series from data storage tags

Author： Stensholt E. Stensholt B.K.

Publisher： Academic Press

ISSN： 1054-3139

Source： ICES Journal of Marine Science, Vol.56, Iss.4, 1999-08, pp. : 537-544

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Abstract

Stensholt, E. and Stensholt, B. K. 1999. Fish movement vectors and the temperature gradient: A geometric analysis method for the depth–temperature time series from data storage tags. – ICES Journal of Marine Science, 56: 537–544.The problem of how to extract information about the horizontal movement and estimate the possible location of a fish from a bivariate time series [d(t), c(t)] of depths and temperatures is considered. The ratio r(t)=[c(t)-c(t-1)] · [d(t)-d(t-1)]^-1is determined by the movement of the fish in the time interval [t-1,t] and the temperature distribution. Geometric considerations lead to formulae that connect r(t), the average temperature gradient▿Tand the unknown horizontal component of the fish moving in the direction of the horizontal component of▿T. The formulae are tools to study the tag record and CTD data in order to describe the relationship between fish movements and temperature distribution.