Deepwater cisco (Coregonus johannae)

Scientific name: Coregonus johannae Wagner, 1910

Deepwater cisco (Coregonus johannae)

The Deepwater cisco (Coregonus johannae) is a freshwater fish of the family Salmonidae. Native range: North America, this species was indigenous to the Great Lakes basin, occurred in the deeper portions of lakes Huron and Michigan.

Biology

Dorsal spines (total): 0; Dorsal soft rays (total): 9-11; Anal spines: 0; Anal soft rays: 10 - 16. Body elongate, moderately compressed laterally. Head relatively long, snout narrow, elongate; mouth terminal, lower jaw usually equal to upper jaw but may be longer or shorter. Overall coloration silvery with pink iridescence. Pale blue or green on back, becoming blue-green on the sides. Ventral surface silvery white. Pigmentation on premaxillae and on top of the head. Fins mainly clear or white, translucent, with lightly scattered pigmentation, pelvic fins immaculate.

Source: FishBase, licensed CC BY-NC 4.0.

Species facts

Scientific name
Coregonus johannae
Family
Salmonidae (Salmonids)
Order
Salmoniformes (Salmons)
Class
Actinopterygii (Ray-finned fishes)
Maximum length
26.5
Common length
27.5
Environment
Freshwater; demersal
Climate
Temperate
Distribution
North America: this species was indigenous to the Great Lakes basin, occurred in the deeper portions of lakes Huron and Michigan.
Conservation status (IUCN)
Extinct (EX)
Threat to humans
Harmless
Resilience
Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.)

Sources

Taxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.

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