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Quantification and Evaluation of Factors Influencing Largemouth Bass Predation of Stocked Advanced Fingerling Yellow Perch
By Seth A. Lundgren , Casey W. Schoenebeck ,Keith D. Koupal ,Jared A. Lorensen and Caleb G. Huber in North American Journal of Fisheries Management 34:595–601, 2014
Thist study involved small (2 to 25 acre) waters with largemouth bass – bluegill base populations like those of many Pond Boss members. The stocker Yellow Perch were 3 inches and they were stocked in late Aug - Sept at 500 fish per acre into lakes with existing populations (all sizes of bass and bluegill and some other species). An obvious point to keep in mind - if larger Yellow Perch fingerlings (say 6 inch) were used predation mortality would be lower, possibly much lower

The survival of stocked fish was estimated with respect to both stocking (handling) mortality and predation by Largemouth Bass. Stocking mortality was found to be zero, while Largemouth Bass consumption of stocked Yellow Perch averaged 26.4%. Consumption was highest on the day of stocking (0.35 perch/bass stomach), with only minimal consumption (0.01 perch/stomach) occurring beyond day 4. Largemouth Bass populations with small size structure (lots of small bass) were predictive of greater Yellow Perch mortality, suggesting that there is greater perch survival in lakes with bass populations of larger (more balanced) size structure. However remember the stocker fish were 3 inch. If larger stocker fish were used then bass size structure would not necessarily have the same effect.

This study again strongly tells us the importance of habituation of newly stocked fingerling fish when potential predators are present. Most predation of newly stocked fingerling fish occurs in the first few days and quickly reduces to minimal amounts. Protect those babies for a few days and you will have a much greater chance of success. It is an easy job using nets or rigid plastic fencing. Prior Cutting Edge articles and threads on the Pond Boss Forum go to great lengths to give the reasons and specifics of habituation (giving them a chance to acclimate to their surroundings) using protective measures like nets or fencing to keep the predators off of the new stockers during the first critical time period.