If the fish have more cover, then any of the predators David listed above are going to have a harder time snagging them. Do you have any vegetation planted around the banks that provides hiding spots, like cattails or mangroves? Is the bottom flat and sandy, or is it a jumble of rocks with small caves and tunnels? Maybe you can find some broken pottery or sewer pipe that you can add to provide more cover.
Drop some old tree branches into the pond as cover and habitat.
"You must be the change you want to see in the world." "First they ignore you, then they laugh at you, then they fight you, then you win." --Mahatma Gandhi
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"Family farms work when the whole family works the farm." -- Adam Klaus