515 ILCS 5/15-100
Except as provided in Sections 20-5 through 20-25, any person may use a single seine not exceeding 100 yards in length of 1 1/2 inch bar measurement. In all seines over 100 yards in length it shall be unlawful at any time to use any mesh less than 2 inch bar measurement except that all seines over 100 yards in length may have a section of the seine not more than 300 feet in length of 1 1/2 inch bar measurement. No seine shall be more than 1500 yards in length. If seines are more than 200 yards in length they must be operated with a backstop constructed of vertical slats not less than 1 1/4 inches apart or 3 inch bar measurement netting or of chicken wire or metallic cloths of not less than 1 1/2 inches square and shall not be dragged or otherwise operated in less than 2 feet of water.
515 ILCS 5/15-100