Monday, September 12, 2011

Deepwater Cisco

The Deepwater Cisco (Coregonus johannae) was one of the largest ciscoes in the Great Lakes. It averaged 30 cm long and about 1.0 kilogram in weight. 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 less 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.

Source: Wikipedia

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