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Hypomesus transpacificus McAllister, 1963 Delta smelt |
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photo by
The Native Fish Conservancy |
| Family: | Osmeridae (Smelts) | |||
| Max. size: | 12 cm TL (male/unsexed); max. reported age: 1 years | |||
| Environment: | pelagic; freshwater; brackish, anadromous | |||
| Distribution: | North America: Sacramento-San Joaquin Delta region in central California, USA. | |||
| Diagnosis: | Dorsal spines (total): 0-0; Dorsal soft rays (total): 9-11; Anal spines: 0-0; Anal soft rays: 16-20; Vertebrae: 52-57. Vomer without posterior process; periphery of glossohyal bone with single row of conical teeth, central part toothless; pyloric caeca 4(2-5); base of adipose fin more than 20% of head length; eye large; adipose eyelid poorly developed. | |||
| Biology: | Adults occur in open brackish and freshwater of large channels. Diet consists of zooplankton (Ref. 33312). | |||
| IUCN Red List Status: | Critically Endangered (CR); Date assessed: 17 February 2012 (A2bce) Ref. (130435) | |||
| Threat to humans: | harmless | |||