Title: California fish and game
Identifier: californiafishga63_2cali (find matches)
Year: [1] (s)
Authors: California. Dept. of Fish and Game; California. Fish and Game Commission; California. Division of Fish and Game
Subjects: Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons
Publisher: (San Francisco, etc. ) State of California, Resources Agency, Dept. of Fish and Game
Contributing Library: California Department of Fish and Game
Digitizing Sponsor: Internet Archive

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106 CALIFORNIA FISH AND CAME Frolander (1964) considered an estuary to be two-layered or stratified when conductivity, as a measure of salinity, changed by four or more units within a 1-m (3.3-ft) depth. By that definition Richardson Bay would be considered a vertically well-mixed estuary. Only during periods of high winter rainfall, near the entrance to the bay, did any evidence of stratification occur. Freshwater inflow into the bay comes mainly from two small creeks which drain a water- shed area of approximately 45.7 km^ (17.6 miies^). Also two sewage treatment plants discharge 11.67 X 10^ gallons of primary treated effluent per year into the bay. Temperature, salinity, and dissolved oxygen levels were monitored through- out the sampling period (Figures 2, 3, and 4). The overall physico-chemical conditions were a function of the tide, season, and freshwater runoff. In winter the marine water entering the bay tended to moderate the colder, turbid up- stream water. Conversely, in summer upstream water temperatures were gener- ally warmer, and salinities were at their annual highs. At times the bay became a "hypersaline" or "negative" type estuary as described by Frolander (1964).
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FICURE 5. Anchored channel net used in the study of fish eggs and larvae. Flow meter (not shown) was nnounted eccentrically in round 0.5 m net opening.

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