In reading this, it just occured to me "what about a snow roof rake"? It's light weight, and has a long handle that comes in sections. I suppose it could be made to float by using some of those pool "noodles",

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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).