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COLEMAN NFH: No Disease Problems identified in juvenile Longfin smelt and Threadfin shad of the Sacramento - San Joaquin River Delta
California-Nevada Offices , November 30, 2007
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Vacoules (holes)in Longfin smelt liver cells. It is likely that they contained lipids.(USFWS photo) 
Vacoules (holes)in Longfin smelt liver cells. It is likely that they contained lipids.(USFWS photo)  - Photo Credit: n/a
Histological section of Longfin smelt. (USFWS Photo: J.S. Foott)
Histological section of Longfin smelt. (USFWS Photo: J.S. Foott) - Photo Credit: n/a
Microscopic examination of larval fish collected in the Delta. USFWS photo: JS Foott, April 2007)
Microscopic examination of larval fish collected in the Delta. USFWS photo: JS Foott, April 2007) - Photo Credit: n/a

Scott Foott, Coleman NFH
Over the last decade, there have been significant declines in Sacramento - San Joaquin River Delta pelagic fishes such as Delta smelt, Longfin smelt, Striped bass, and Threadfin shad. The California-Nevada Fish Health Center, in cooperation with California Department of Fish and Game and the University of California, Davis, conducted histological and virus surveys of larval and juvenile Longfin smelt (Spirinchus thalleichthys) and Threadfin shad (Dorosoma petenense) in 2006 and 2007. Low level parasite infections were observed but are not considered significant. No virus was isolated from over 800 samples. Vacuolated liver cells were seen in Longfin smelt collected during the fall however it is not clear if this condition is abnormal.


Contact Info: Scott Flaherty, , Scott_Flaherty@fws.gov



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