Information about Miller’s Thumb? What does mean Miller’s-Thumb
MILLER’S-THUMB, a common English and American name for several species of small, fresh-water fish of the genus Cottus. They are smooth skinned, and are remarkable for their disproportionateİy large heads, flattened like the proverbial miller’s thumb. They feed on insects, small crustaceans, algae, and the eggs of other fishes.
C. gobio, common in streams in England, northern Europe, and northern Asia, seldom grows more than 4 or 5 inches long; it is brown-ish above and whitish beneath. C. bairdii and C. cognatus, common in clear, rocky streams in North America east of Missouri, grow up to 5 or 6 inches long. Olive green, or brownish mottled with darker brown, they readily blend with the appearance of stream bottoms or tangles of pondweed. The spawning season of these small fishes is from April to July. The eggs, which are about an eighth of an inch in diameter, are laid in pinkish clusters, each cluster contain-ing from one hundred to two hundred eggs.
Miller’s-thumbs have also been given the name of bullheads. They differ from the bullheads of the common American catfish family.