Fishing is not permitted at the Elkhorn Slough National Estuarine Research Reserve. Along with those restrictions, a large part of the Slough waterway is a State Marine Reserve, making it closed to all fishing and protecting all marine life and plants.
Click here for a map of the slough showing the protected areas. You’ll notice Kirby Park is not included in the State Marine Reserve, so fishing is permitted at Kirby Park, but please take note of the nearby restricted areas. Also note that right now Kirby Park is Closed until further notice.
Below are the regulations from California Fish & Wildlife:
Elkhorn Slough State Marine Reserve.
(A) This area includes the waters below mean high tide within Elkhorn Slough lying east of longitude 121° 46.400’ W. and south of latitude 36° 50.500’ N.
(B) Area restrictions defined in subsection 632(a)(1)(A) apply.
Elkhorn Slough State Marine Conservation Area.
(A) This area includes the waters below mean high tide within Elkhorn Slough east of the Highway 1 Bridge and west of longitude 121° 46.400’ W.
(B) Area restrictions defined in subsection 632(a)(1)(C) apply, with the following specified exceptions:
1. The recreational take of finfish by hook-and-line only and clams is allowed. Clams may only be taken on the north shore of the slough in the area adjacent to the Moss Landing State Wildlife Area [subsection 550(a)].
For more complete up to date information visit the Fish and Wildlife website: https://www.dfg.ca.gov/marine/mpa/ccmpas_list.asp