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Notes: Accuracy and Precision of Daily Age Estimates for Walleyes from Ohio Hatcheries and Lake Erie
Author(s) -
Parrish Donna L.,
Vondracek Bruce,
Eckmayer William J.
Publication year - 1994
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1994)123<0601:naapod>2.3.co;2
Subject(s) - stizostedion , otolith , fishery , hatchery , fish <actinopterygii> , biology , environmental science , geography
In this paper we document the accuracy and precision of estimating daily ages of age‐0 walleyes Stizostedion vitreum from their sagittal otoliths. For hatchery‐cultured walleyes of known age, the relation between estimated and actual age was 1:1 for fish 14–42 d old, but was less than 1:1 for fish 49–63 d old. Also, large variations in estimated age occurred between otolith readers and between sequential readings by the same person for both hatchery fish and wild Lake Erie juveniles. Although our results are specific for walleye, we urge managers and researchers to address a priori the levels of accuracy and precision of daily ages required in any study.