Hard to believe it isn't worse than that. I would do a quick repair to seal it up, then do a proper repair at the end of the season.
Buy some fiberglass resin & hardener and some white color, mask it off, mix it up and paint on a couple coats.
Get your supplies here. They are less than half the price than getting this from a marine dealer.
ONE TIME TANDEM AXLE PACKAGE DEAL
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5 14X5.5 T06 WHEELS W/GUNMETAL INLAY
5 ST215/75R14 KENDA LOADSTAR KR03 RADIALS
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CARBURETOR REBUILDING - $125 + PARTS
LED lights, Chrome & Powder Coated Lugs