Dale, if they are shad they probably are Gizzard Shad. Threadfins won't live thru a winter there. They are susceptible to a light dose of Rotenone, light enough that it won't affect other fish in the pond. Gizzards grow quickly to a size that Northern Strain LMB just cannot eat.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).