speckle-belly

from The Century Dictionary.

• noun The North American white-fronted goose, Anser albifrons gambeli: so called in California because the under parts are whitish, blotched and patched with black. Also called harlequin brant, speckled brant. See cut under laughing-goose.
• noun The gadwall, or gray duck, Chaulelasmus streperus. See cut under Chaulelasmus.
• noun A trout or char, as the common brook-trout of the United States, Salvelinus fontinalis. See cut under char.