. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. PACIFIC HERRING STUDIES 171 on California grounds, and usually they have been only of very light and light intensity. The eggs are deposited at various levels of the intertidal zone, and also below this zone, where they are never exposed to air. In situations such as these many fluctuations in temperature, salinity, etc, occur and the hatching time may extend well over a week because of differential development of the eggs. In Califor
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. PACIFIC HERRING STUDIES 171 on California grounds, and usually they have been only of very light and light intensity. The eggs are deposited at various levels of the intertidal zone, and also below this zone, where they are never exposed to air. In situations such as these many fluctuations in temperature, salinity, etc, occur and the hatching time may extend well over a week because of differential development of the eggs. In California in 1955, eggs hatched from 6 to 11 days after spawning, with the water temperatures ranjriiijr between 8 and 10 decrees C. ( and degrees F.). Stevenson (1950) found in Canada that eggs deposited on March 15 reached a peak of hatching in 11 to 13 days, whereas e<--<.-s deposited in the same area on .March 25 reached a peak of hatching in 8 to 9 days after spawning. Pre-spawning Behavior Prior to spawning, fish in Tomales Bay remain near the center of the bay, often schooling well below the surface in the deepest areas. Not until one or two days before and during actual spawning can the beach seine iishermen catch fish along the shore line. During 1952, lampara fishermen in Tomales Bay were able to catch schools of pre-spawning adults in the deeper holes before spawning took place. In San Francisco Bay, herring concentrate in large pre-spawning schools in the Raccoon Strait area and in the area between Sausalito, Angel Island, and Aleatraz Island. The daily tidal fluctuation is greater in San Francisco Bay than in Tomales Bay and, during periods when the tide is running strong, the herring remain well below the surface in deep areas and behind submerged reefs and banks. Echo-sounding tracings (Figure 6) demonstrate this Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colora
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