(a) The Department of Agriculture may prohibit the taking or harvesting of shellfish from designated areas in tidal flats, shores and coastal waters whenever it finds by examinations or surveys that such flats, shores or coastal waters are contaminated or polluted to the extent that the waters do not meet standards of purity established by said department, in conjunction with the Department of Public Health, or that shellfish obtained therefrom may be unfit for food or dangerous to the public health. The Department of Agriculture shall classify the coastal waters, shores and tidal flats for the taking of shellfish. The classifications shall be: Approved, conditional, restricted, conditionally restricted, and prohibited. The conditional classification shall include conditional-open and conditional-closed. Any person aggrieved by a classification decision pursuant to this section may appeal such decision in accordance with the provisions of chapter 54. An area may be classified as prohibited for the taking or harvesting of shellfish unless it conforms to the standards established by the department for classifications other than prohibited. The department may specify the activities which may occur within each classified area. Such activities shall be listed on a shellfish license issued by the department. Waters and areas classified as approved or conditional-open shall conform to standards of purity, shall be free from discharge of sewage or other deleterious substances, and the shellfish obtained therefrom shall not be so polluted or contaminated as to be dangerous to the public health. The Department of Agriculture may delegate its authority for the classification of tidal flats, shores and coastal waters for the taking of shellfish pursuant to this section to other state agencies and local agencies.

(b) The department shall, by written order, promulgate definite bounds of the area or areas closed to shellfishing when classified as conditional-closed, conditionally restricted, restricted or prohibited. Such order shall become effective when (1) the closure classification is published in a newspaper having circulation in towns, cities and boroughs in which or adjacent to which any such area is situated; (2) the classification is filed in the offices of the clerk and the director of health in each such town, city or borough, and (3) signs are posted at points on or near every such classified area.

(c) Notwithstanding the provisions of subsection (b) of this section, when the Commissioner of Agriculture, after consultation with the Commissioner of Public Health, finds that tidal flats, shores or coastal waters which may contain shellfish are so contaminated or polluted that a health emergency exists, he may close such area for the duration of such emergency by giving notice of such emergency closure (1) in writing to the municipal or district health authority, and (2) to the general public by publication in a newspaper having general circulation in the town, city or borough within which such area lies. Such notice shall state when the closing shall take effect.

(d) No person shall take or harvest shellfish from areas classified as conditional-closed, restricted, conditionally restricted or prohibited pursuant to subsections (a) and (b) of this section or closed because of a health emergency pursuant to subsection (c) of this section or from areas or parts of areas where shellfish have been transplanted or relayed except in accordance with the terms and conditions of a license issued pursuant to § 26-192c or § 26-192h. The Department of Agriculture may delegate its authority for the classification of coastal waters, shores, and tidal flats for the taking of shellfish pursuant to this section to other state agencies and local agencies.