| Figure
3.40. |
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Aquatic bioassay results for 1997. Clean
artificial seawater was used for control samples.
See Appendix A for a description of the methods
used. Toxicity was determined by statistical comparison
to controls. Toxicity in the seven-day Mysidopsis
test was observed in both January and August at
Sunnyvale (C-1-3). However, in the January mysid
test at Sunnyvale (denoted by *), toxicity was likely
caused by hypoxic test conditions. Mysid toxicity
was also observed in January at Napa River (BD50),
Sacramento River (BG20), San Joaquin River (BG30),
and Grizzly Bay (BF20) and in August at Redwood
Creek (BA40), San Jose (C-3-0), and Coyote Creek
(BA10). The 48-hour tests using Mytilus larvae
indicated statistically significant embryo toxicity
in January at Sunnyvale (C-1-3), Redwood Creek (BA40),
Pinole Point (BD30), and Grizzly Bay (BF20). However,
percent normal development at these stations was
relatively high. The statistical test was significant
because of low variability in the control treatment
and probably does not indicate toxicity in the samples.
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