One problem could be the net getting snagged on something on the bottom.
I've seen guys use a siene net - I'm guessing about 25 feet - to get Spot for bait. They waded out about chest deep and then brought the net up on a small beach.
They got a lot but most were little. Not many of the 4-6 inchers that seem to work best.
Be careful in shallows - getting a Cownose Ray in your cast net would suck.
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