EPA created maps for six fish species that show changes in abundance and distribution as they relate to seasonal changes in the salinity gradient over a 33-year time period. The maps visualize established salinity-abundance relationships and show how distribution has changed over time in the San Francisco Bay Delta Estuary.
The seasonal salinity gradient was simulated by the coarse-grid version of the UnTRIM San Francisco Bay-Delta Model and fish monitoring data are from the San Francisco Bay Study.
The maps show that the abundance of a number of fish species is higher when the low salinity zone is within or westward of Suisun Bay consistent with established science.
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Delta Smelt.pdf (PDF)(33 pp, 5 MB,
July 2015)
Seasonal salinity gradient and Delta smelt abundance and distribution from 1980-2012
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Longfin Smelt juvenile.pdf (PDF)(33 pp, 5 MB,
July 2015)
Seasonal salinity gradient and juvenile Longfin smelt abundance and distribution from 1980-2012
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Longfin Smelt.pdf (PDF)(33 pp, 5 MB,
July 2015)
Seasonal salinity gradient and longfin smelt abundance and distribution from 1980-2012
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Pacific Herring.pdf (PDF)(33 pp, 5 MB,
July 2015)
Seasonal salinity gradient and Pacific herring abundance and distribution from 1980-2012
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Sacramento Splittail.pdf (PDF)(33 pp, 5 MB,
July 2015)
Seasonal salinity gradient and Sacramento splittail abundance and distribution from 1980-2012
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Starry Flounder.pdf (PDF)(33 pp, 5 MB,
July 2015)
Seasonal salinity gradient and starry flounder abundance and distribution from 1980-2012
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Striped Bass.pdf (PDF)(33 pp, 5 MB,
July 2015)
Seasonal salinity gradient and striped bass abundance and distribution from 1980-2012