from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A freshwater trout (Salvelinus oquassa) found in the Rangeley Lakes in western Maine.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A small, handsome trout, Salvelinus oquassa, found in some of the lakes in Maine.
from the GNU version of the Collaborative International Dictionary of English
- n. A small, handsome trout (Salvelinus oquassa), found in some of the lakes in Maine; -- called also blueback trout.
from The Century Dictionary and Cyclopedia
- n. The bluebacked trout, Salmo oquassa.
The most abundant populations of the Maine blueback form of S. a. oquassa occurred in the Rangeley Lakes.
Evidently, at least some populations of oquassa have retained the ability to utilize salt water.
The virtual identity of all populations of oquassa in their taxonomic and genetic characteristics confirms that they have not been isolated for a long time in evolutionary terms and that, most logically, all should be classified as a single subspecies.
According to the hypothesis guiding the classification used in this book, the ancestor of the subspecies S. a. oquassa was the first form of Arctic char to become established in North America.
Yellow and orange colors on the sides and ventral region are common, but in many lakes red is more characteristic of the oquassa group known as Quebec red trout.
In North America, the characteristics of this subspecies are highly stable, except for areas of Labrador where their distribution overlapped with the oquassa evolutionary line and hybridization occurred.
S. a. oquassa, contains the relict char of northern New England and southeastern Quebec—Sunapee trout, blueback trout, and Quebec red trout.
It was via this Atlantic Ocean route that, in preglacial times, the ancestor of the subspecies oquassa probably reached North America.
The ancestor was undoubtedly anadromous, dispersing from river to river via the sea, but all historical populations of oquassa have, until recently, been thought to be resident lake populations.
Southward in Labrador, the Arctic char populations show intergrading characters between erythrinus and oquassa.