. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. STURGEON SPAWNING 37 for temperatures observed during spawning and assumed linear growth between these ages (Figure 6). Since larval lengths at capture and approximate water temperature during development were known, the age of each larva (from spawning) could then be interpolated from Figure 6. These ages ranged from 5 to 25 days and averaged days. They were subtracted from capture dates to calculate spawning dates. y = l6,6-0,6
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. STURGEON SPAWNING 37 for temperatures observed during spawning and assumed linear growth between these ages (Figure 6). Since larval lengths at capture and approximate water temperature during development were known, the age of each larva (from spawning) could then be interpolated from Figure 6. These ages ranged from 5 to 25 days and averaged days. They were subtracted from capture dates to calculate spawning dates. y = l6,6-0,62X r-0 97. 16 17 TEMPERATURE CO FIGURE 5. Relationship between water temperature and sturgeon larval development, derived from the following sources and species: Geibel 1966 1. Huso huso 2. Acipenser guldenstadti 3. A. stellatus Cherfos 1956 4. A. guldenstadfi 5. H. huso Nikolskii 1961 6. H. huso 7. A. nud/Venfris 8. A. stellatus Line (A) was assumed to represent larvae 8 mm long and line (B) was assumed to represent larvae 18 mm long. Estimated spawning occurred from mid-February to late-May, with 93% between March 3 and May 5 (Figure 7). During this two-month period, water temperature was C (46-64 F). Maximum spawn- ing (April 8-17) occurred at approximately C (58 F). Maximum temperature during the spawning period was C (72 F). There was no relationship between changing water temperature and spawning intensity. Kiver flows had no effect on sturgeon spawning intensity. While most spawning occurred during periods of decreasing flows, this is the domi- nant flow regime during the spring. There was no obvious flow threshold at which spawning was 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. D
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