The cormorants fly as soon as they see a human. I don't know if cover will do much good, there is Sago in the pond, enough to clog an electric trolling motor and visibility typically runs 12" during the summer to around 24" during the winter. Right now it's hovering around 18"

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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).