State: Oklahoma Grant Number: F-50-R
Grant Title: Fish Research for Oklahoma Waters
Project Number: 9
Project Title: Optimizing saugeye sampling protocol.
Contract Period: From: March 1. 1996 To: February 28. 1997
Monthly electrofishing samples for saugeye (walleye x sauger hybrids; Stizostedion vitreum vitreum x S.
canadense) were collected on three lakes during spring and fall, 1996. Sampling was stratified by day and night and
habitat type. Catch per hour (CPUE) was calculated for four size classes and compared for each sampling strata.
Precision of the estimates was calculated and sampling recommendations made.
Differences in seasonal catch rates were inconsistent between lakes and among size classes. CPUE's of night
samples were higher for all lakes for the "small" and "intermediate" size classes. However, no clear diel pattern in
catch rates of "large" saugeye were observed. Habitat type had little effect on sampling efficiency. Precision of most
samples was poor. Ten hours of electrofishing would be needed to obtain estimates ±75% of the mean.
Sampling recommendations included collecting data on the "small" and "intermediate" size classes using fall
night electrofishing. Data on "large" saugeye could be collected during the fall night samples and also during spring,
day time electrofishing sampling targeting largemouth bass. In order to collect statistically reliable data, sampling effort
needs to be increased 7-fold over existing sampling protocols.
I. Problem or Need:
With increasing demands placed on the time of fisheries management staff and ever shrinking budgets,
increased sampling efficiency is imperative to effective management programs. Further complicating the balance
between available time and funds and collecting quality information, is the increased awareness that collecting
statistically reliable data is often dependent on designing species-specific sampling programs (Parrish et al. 1995).
The Oklahoma Department of Wildlife Conservation (ODWC) has been stocking saugeye (walleye-sauger
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