Here's some more input and junk to keep in the boat. We used a styrofoam swim ring like the kids play with, then sewed a piece of fiberglass screen around it with a bit of a sag to the middle creating a fine mesh strainer. Pick up a cluster of hyacinth and drop it quickly into the screen and shake it a few times. The grass shrimp will be in the screen when you lift the hyacinth to return it to the water. The fine mesh hand net thing worked for us too, but there was so much hyacinth in the St.Johns it was easier if mot as productive. Bull gills love the things.