Fish and bivalves at Bolsa Chica Marsh re-establishment project, Report IV

Knaggs, Eric H. and Mall, Rolf E. (1981) Fish and bivalves at Bolsa Chica Marsh re-establishment project, Report IV. Long Beach, CA, California Department of Fish and Game, Marine Resources Region, (Marine Resources Administrative Report, 81-4)

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Abstract

The objectives of this study are: 1. Determine changes in the number of species of fishes and bivalves before Phase I and during Phase I at Bolsa Chica Marsh. 2. Determine if California Department of Fish and Game's predicted benefits in Phase I were achieved by increases in fish species. 3. Determine influences of water management practices upon fish and bivalve composition. This report is divided into two major topics: (1) the fishes and the bivalves collected in July, August, and September 1980 and (2)a discussion of the project objectives after four quarters of sampling. Fifteen species of fishes and eight species of bivalves were collected from inner Bolsa Bay and south Bolsa slough in July, August, and September 1980. Giant kelpfish, Heterostichus rostratus; gray smoothhound, Mustelus californicus; California halibut, Paralichthys californicus; yellowfin croaker, Umbrina roncador; Washington clam, Saxidomus nuttalli; egg cockle, Laevicardium substriatum; and a small burrowing clam, Cooperella subdiaphana, have not been previously reported from inner Bolsa Bay. The number of fish species in outer Bolsa Bay changed from 10 prior to Phase I to 18 during Phase I. The number of fish species in inner Bolsa Bay and south Bolsa slough changed from three prior to Phase I to 24 during Phase I. Eleven species of bivalves were found in outer Bolsa Bay both prior to Phase I and during Phase I. The number of bivalve species in inner Bolsa Bay changes from two prior to Phase I to nine during Phase I. With the water management practices of Phase I in inner Bolsa Bay and south Bolsa slough; the number of resident fish species is 14, while the number of resident bivalves is five. All three study objectives are discussed and recommendations are made on water management practices concerning fishes and bivalves in inner Bolsa Bay and south Bolsa slough. (33pp.)

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