Deepwater cisco: Difference between revisions
m Robot - Moving category Recent extinctions to Extinctions since 1500 per CFD at Wikipedia:Categories for discussion/Log/2011 January 3. |
Luckas-bot (talk | contribs) m r2.7.1) (robot Adding: zh:深水白鮭 |
||
| Line 32: | Line 32: | ||
[[nl:Coregonus johannae]] |
[[nl:Coregonus johannae]] |
||
[[sr:Coregonus johannae]] |
[[sr:Coregonus johannae]] |
||
[[zh:深水白鮭]] |
|||
Revision as of 14:55, 7 July 2011
| Deepwater cisco | |
|---|---|
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Class: | |
| Order: | |
| Family: | |
| Subfamily: | |
| Genus: | |
| Species: | C. johannae
|
| Binomial name | |
| Coregonus johannae Wagner, 1910
| |
The deepwater cisco (Coregonus johannae) was one of the largest ciscoes in the Great Lakes. Its average length was 30cm (12 inches) and it was about 1.0 kilogram (2.2 pounds) in weight. Occurring only in Lakes Huron and Michigan, and inhabited waters between 50 and 150 metres deep, it was difficult to distinguish from other ciscoes and was possibly the same species as the shortjaw cisco (Coregonus zenithicus). The deepwater cisco was distinguished by usually having fewer than 33 gill rakers, relatively long pectoral fins, and unpigmented jaws. It was a silvery colour with a pink or purple lustre and a green or blue back. It spawned in August and September, earlier than most other ciscoes and, because of its large size, the deepwater Cisco was heavily fished commercially.
The last specimens of deepwater ciscoes were recorded in Lake Huron in 1952 and Lake Michigan in 1951. The main reasons for its extinction were competition from the invasive alewife and predation by the introduced sea lamprey.
References
- Template:IUCN2006
- Froese, Rainer; Pauly, Daniel (eds.). "Coregonus johannae". FishBase. February 2008 version.