Conn. Gen. Stat. § 26-119
Fish shall not be taken by means of any explosive. Except for mining or mechanical purposes, no dynamite or any other explosive shall be used in any of the waters of the state or possessed upon any shore or island of any inland water thereof, and possession thereof by any person on any shore or island of any inland water shall be prima facie evidence that the same is possessed for use in violation of the provisions of this section. No person shall place in any lake, pond or stream any lime, creosote or cocculus indicus or any other drug or poison injurious to fish; provided the persons or corporations supplying water to the inhabitants of any town, city or borough may apply copper sulphate to the waters of any lake, pond or reservoir under their control within such limits as may be established by the Department of Public Health. The provisions of this section shall not affect the authority of the Commissioner of Energy and Environmental Protection to issue permits for the addition of chemicals to any inland water for the control of vegetation, fish populations or other aquatic organisms. Any person who violates any provision of this section shall be fined not more than one hundred dollars. Each fish taken or possessed in violation of any provision of this part shall constitute a separate offense.
Conn. Gen. Stat. § 26-119
(1949 Rev., S. 4938; February, 1965, P.A. 271, S. 3; P.A. 77-614, S. 323, 610; P.A. 93-381, S. 9, 39; P.A. 95-119, S. 7; 95-257, S. 12, 21, 58; P.A. 11-80, S. 1.)
See Sec. 22a-66z re permits for use of pesticides in state waters. See Sec. 26-22 re measures to control aquatic plants and animals.