Some custom made seines have a bag built into the center of the seine.

Here are a couple lesser known fish seine net companies to help you do due diligence and cost shopping:
http://www.millernets.com/seines1.html

http://www.douglasnets.com/home.php

Lift nets are available in large sizes.
http://www.memphisnet.net/category/nets_lift_knotless

One of the biggest management tasks will be keeping the weeds and filamentous algae that includes Chara to a minimum so fish harvest is possible.

Last edited by Bill Cody; 07/18/14 07:20 PM.
aka Pond Doctor & Dr. Perca Read Pond Boss Magazine -
America's Journal of Pond Management