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An edible fresh-water New Zealand fish (Prototroctes oxyrhynchus) of the family Haplochitonidæ. In general appearance and habits, it resembles the northern lake whitefishes and trout. Called also grayling.

A genus of small spiral fresh-water gastropods having an operculum.

Any fresh-water gastropod of the genus Valvata.

See Embiotocoid. -- Viviparous shell (Zoöl.), any one of numerous species of operculated fresh-water gastropods belonging to Viviparus, Melantho, and allied genera. Their young, when born, have a well-developed spiral shell.

An American fresh-water food fish (Stizostedion vitreum) having large and prominent eyes; -- called also glasseye, pike perch, yellow pike, and wall-eyed perch.

An American fresh-water mussel (Quadrula pustulosa). Its shell is used in making buttons.

A floating mass formed in pools by the entangled filaments of a European fresh-water alga (Cladophora crispata).

swimming. They are often red or red and black in color, and while young are parasites of fresh-water insects and mussels. Called also water tick, and water spider.

harbors, in distinction from a seaman who is engaged on the high seas; a man who manages fresh-water craft; a boatman; a ferryman.

ite partridge (Zoöl.), the white ptarmigan. -- White perch. (Zoöl.) (a) A North American fresh-water bass (Morone Americana) valued as a food fish. (b) The croaker, or fresh- water drum. (c) Any California surf fish. -- White pine. (Bot.) See the Note under Pine. -- White poplar (Bot.), a European tree (Populus alba…

Any one of several species of fresh-water ducks, especially those belonging to the subgenus Mareca, of the genus Anas. The common European widgeon (Anas penelope) and the American widgeon (A. Americana) are the most important species. The latter is called also baldhead, baldpate, baldface, baldcrown, smoking duck, whea…

A suborder of soft-rayed fresh-water fishes of which the blackfish of Alaska (Dallia pectoralis) is the type.

, and jaundice. -- Yellow bark, calisaya bark. -- Yellow bass (Zoöl.), a North American fresh-water bass (Morone interrupta) native of the lower parts of the Mississippi and its tributaries. It is yellow, with several more or less broken black stripes or bars. Called also barfish. -- Yellow berry. (Bot.) Same as Per…

A European fresh-water bream (Abramis ballerus).