By Javier Lobon-Cervia, Carmen G. Utrilla
Fisheries Research, Volume 15, Issue 4, January 1993, Pages 369-378, ISSN 0165-7836, DOI: 10.1016/0165-7836(93)90087-N.

We have investigated the relationships between three successive removals with electrofishing and the subsequent estimated numbers for two and three catches (Zippin method) in four contrasting trout streams (166 samples). Significant correlations were found for all these parameters. For three size-age groups (O+, > O+ and total population), prediction of fish numbers from the first capture (C1) can be obtained from linear regressions. For any of these groups, catchability (p) is rather unpredictable.

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