. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 102 CALIFORNIA FISH AND CAME concerned with temporal distribution of fish eggs and larvae over short time periods. This work is the subject of the present paper. The major part of the ichthyoplankton survey covered the entire Richardson Bay at weekly intervals over a 1-year sampling period. The results of that survey will be reported later. Diurnal and nocturnal rhythmic behavior has been documented in adult es- tuarine fishes (Gibson
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 102 CALIFORNIA FISH AND CAME concerned with temporal distribution of fish eggs and larvae over short time periods. This work is the subject of the present paper. The major part of the ichthyoplankton survey covered the entire Richardson Bay at weekly intervals over a 1-year sampling period. The results of that survey will be reported later. Diurnal and nocturnal rhythmic behavior has been documented in adult es- tuarine fishes (Gibson 1969). Likewise, larvae have exhibited varying diel distri- bution patterns in open-ocean waters (Isaacs 1964; Bridger 1956) and inshore areas (Lewis and Wilkens 1971; Lewis and Mann 1971; Richards and Kendall 1973; Pearcy and Myers 1974). Since day-night differences in distribution can bias survey results, an effort was made to determine factors affecting distribution of Richardson Bay ichthyoplankton. This paper reports the results of eight 24- hour samplings conducted at two locations from March 23, 1972, to February 9, 1973. DESCRIPTION OF THE STUDY AREA Richardson Bay is approximately 11 km ( miles) north of the San Francisco Peninsula (Figure 1). Its total area covers approximately km^ ( miles^). This surface area changes 10-13% during spring tide conditions indicative of the shallow depth of the bay which averages only m ( ft). The only channel of notable depth averages 6m ( ft) and is a minor ship channel adjacent to the city of FIGURE 1. Map of Richardson Bay, California, showing the two sampling stations used in the study of the diel distribution of fish eggs and larvae. Short-dashed lines represent the 10-m contours. Long-dashed lines represent water level at zero feet tide Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance
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