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Monday, January 28 • 11:50am - 12:00pm
(FISHERIES: LIGHTNING TALK) Assessment of a Post Fish Renovation Stocking Strategy of Adult Pre-Spawn Largemouth Bass in Two Southern Iowa Impoundments

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AUTHORS: Andy Jansen, Iowa DNR's Mount Ayr Fish Management and Cold Springs Fish Management Stations

ABSTRACT: Largemouth bass (Micropterus salmoides) abundance post-renovation and time for bluegills (Lepomis macrochirus) to grow to 8 inches have varied in impoundments following complete fish renovations. This study evaluated a post-renovation stocking strategy to increase young of year (YOY) largemouth bass (LMB) abundance that utilized pre-spawn adult (> 12 inches) LMB at the rate of 1.0/acre, in addition to the traditional stocking strategy that uses 2-inch LMB fingerlings stocked in June, and time for bluegills (BLG) to reach 8 inches at Little River Watershed Lake and Prairie Rose Lake. First year post-renovation LMB fall electrofishing catch-per-unit-effort (CPUE) for the two impoundments were 1084/hour and 430/hour, respectively. It was determined that a vast majority of the fall YOY LMB were from natural reproduction. Maximum lengths of BLG sampled in Little River Watershed Lake and Prairie Rose Lake in fall fyke nets exceeded 8 inches two years post fish renovation. It was determined that BLG did grow to 8 inches in two years with the development of a high LMB abundance the first year post-renovation. This evaluation has shown pre-spawn adult LMB stocking strategy in two renovated impoundments produced a high LMB abundance the first year post-renovation and 8-inch BLG in two years.

Monday January 28, 2019 11:50am - 12:00pm EST

Attendees (4)