Ichthyoplankton and Station Data For Oblique (Bongo Net) Plankton Tows Taken During a Survey of Shallow Coastal Waters of the Southern California Bight in 2004 and 2005; Tech. memo

摘要

NOAA Southwest Fisheries Science Center, working with the City of Los Angeles Department of Public Works, conducted a survey of fish eggs and larvae in the nearshore zone of the Southern California Bight during 2004-2005. Oblique bongo net tows through the water column were made at each of five depth intervals between the 8- and 75-m isobaths at each of four sites between Ormond Beach and San Onofre, California, during six quarterly surveys from January 2004 to July 2005. The 120 samples yielded 41 categories of fish eggs and 72 categories of fish larvae; the five most abundant taxa accounted for about 94 percent of the total standardized fish egg abundance and about 88 percent of the total standardized larval fish abundance. Northern anchovy, 'Engraulis mordax', was the overwhelmingly dominant species, accounting for 76.1 percent of the total fish eggs and 70.9 percent of the total fish larvae. This report provides ichthyoplankton data and associated station and tow data from the 2004-2005 nearshore survey. The data are listed in a series of nine tables; the background, methodology, and information necessary for interpretation of the data are presented in an accompanying text. All pertinent station and tow data, including volumes of water strained and standard haul factors, are listed in the first table. Other tables list, by station and month, standardized counts (number under 10 square meters of sea surface) of each of the fish egg and larva categories identified in the plankton net tows. This report makes the ichthyoplankton and station data available to all investigators and serves as a guide to the electronic data base.