You can buy a siene net at any sporting goods store pretty much or a bait and tackle store. The only problem is you will need two people to work the net. I would suggest atleast a 20' net.
We used to use towels, did catch much though.
Local catch update:
Last week mid week all the fish I caught broke out with a severe case of ick! The Lookdown were completely white. However the little grey snapper didn't seem to have much on him. Thursday hooked up a UV sterilizer (Thanks Greg and Frank) went away to PA for the weekend. Came home figuring most of the fish would be dead. To my surprise everyone was still alive and looked great! The Lookdown were the only ones you could see just a few white spots. The Lookdowns are also eating frozen mysis!
Not out of the wood yet but things are looking better
What I did when I saw the ick was the following (this always worked for me when I had fish only, the exception is with new fish)
1. Hook up a UV sterilizer 24/7
2. Keep the tank dark only 4 hours of light per day
3. Plenty of places for fish to hide ( I see alot of QT tanks empty)
4. Temp high first day then lower it 5 to 7 deg for 6 more days.
5. I didn't do this but I used to years ago - Setup a QT tank with an under gravel filter. Use very little gravel. Hook up a pwoer head for the suction. Tee the effluent line from the powerhead to a UV sterilizer then return to tank. This will kill any parasite droping off to reproduce in the gravel when it becomes free swimming or at least thats the plan.
Anyway this is my experience, not fact
-Walter