Conn. Gen. Stat. § 26-177: Mystic River.

No person shall draw any seine in the Mystic River north of a line running due east from the lighthouse in Groton, from April fifteenth to November first. No person shall draw or assist in drawing any seine for the purpose of taking fish in said river north of the upper bridge, known as Mystic Bridge, or in the waters of Stonington above the railroad bridge. No person shall catch smelt in said river or its tributaries except with hook and line.