. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. MARINE MACROPHYTES AND SPAWNING OF PACIFIC HERRING 237 Zostera morinq fc! 1. FIGURE 2. Distribution of Zostera marina in Moss Landing Harbor and Elkhorn Slough. Gracilaria collected from Elkhorn Slough was predominately non-reproduc- tive; rarely were tetrasporangial plants found. However, cystocarpic plants were common in the adjacent Gracilaria populations of Moss Landing Harbor. Herring Spawn Assessments and Estimates of Spawning B
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. MARINE MACROPHYTES AND SPAWNING OF PACIFIC HERRING 237 Zostera morinq fc! 1. FIGURE 2. Distribution of Zostera marina in Moss Landing Harbor and Elkhorn Slough. Gracilaria collected from Elkhorn Slough was predominately non-reproduc- tive; rarely were tetrasporangial plants found. However, cystocarpic plants were common in the adjacent Gracilaria populations of Moss Landing Harbor. Herring Spawn Assessments and Estimates of Spawning Biomass The areas where herring spawns were found during the three-year study period are illustrated in Figure 5. Three discrete herring spawning runs were observed during the 1979-80 season (Table 1). On the basis of vegetated area, the spawns were primarily on Gracilaria. Herring spawns were found only in the Harbor, the Yacht Club, and the mouth of Elkhorn Slough (Stations 1,2A,2B and 3; Figure 1). Egg deposits were very light and the total spawning area was estimated at 3,730 m2. Based on our estimates of Gracilaria standing crops, approximately 41 million eggs were spawned on Gracilaria by short ton of herring. We were informed that a fourth herring spawn occurred during the 1979-80 season at the head of Elkhorn Slough near Hudson's Landing. We attempted to document this report and found no evidence of herring spawning activity. However, herring eggs hatch in 6-11 days (Hardwick 1973), and we may have been too Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original California. Dept. of Fish and Game; California. Fish and Game Commission; California. Division of Fish and Game. [San Francisco, etc. ] State of California, Resources Agency, Dept. of Fish and Game
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