Abstract
Abstract Pennsylvania hatcheries annually produce nearly 100 million walleyes Stizostedion vitreum for the stocking of inland lakes and reservoirs. Because fry can be produced in greater numbers and at less expense than fingerlings, the vast majority of walleyes reared in Pennsylvania are stocked as fry. Despite extensive stocking efforts, survival of hatchery-reared walleye fry has been poor in most impoundments. The objective of this study was to evaluate several prestocking variables that may affect short-term survival of walleye fry. In a 24-h simulated stocking bioassay, we evaluated survival of hatchery-reared walleye fry subjected to several different production variables including tetracycline marking, hauling time, and hauling density. Mean fry survival ranged from 87.0% to 97.3% among all treatment groups, indicating that high poststocking mortality is not a result of these production variables within the ranges tested.
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