11/10/2022 0 Comments Circuli vs annuli![]() ![]() The scales are ctenoid, with radial groves extending from the focus to the forward margin of the scale. Impressions of the dried scales are made in laminated plastic using a roller press and viewed on a microprojector at a magnification of 40x. Scales are taken from the lateral line area a few centimeters anterior to the caudal peduncle for dry storage. At the Woods Hole Laboratory, scales are used as the primary structure, although otoliths are used quite frequently for a corroboration of age determination. ![]() Winter flounder spawn from January through May with spawning beginning earlier in southern portions of its range.Įarly investigators (Lobell 1939, Perlmutter 1940) chose scales as the preferred structure later investigators based age determinations on otoliths (Berry et al. Both males and females mature sexually at age 2, although males mature at a smaller size than females. The growth rate up to age 2 is the same for both sexes, but thereafter females grow faster and live longer than males (Lux 1973). Winter flounder are relatively long-lived, reaching a maximum age of about 15 years and a length of 58 cm. Lux (1973) observed that winter flounder on Georges Bank grow faster than fish from inshore areas. Little mixing occurs between Georges Bank and inshore areas (Howe and Coates 1975). Movements north of Cape Cod are relatively localized and confined to inshore waters, whereas south of Cape Cod, flounder disperse seasonally in relation to water temperature. The fish appear to be broken up into local subpopulations that are relatively stationary. Migrations of winter flounder are not extensive. For descriptive purposes, the winter flounder resource and fishery have been divided into four major geographic groups: Gulf of Maine, Georges Bank, Southern New England, and Mid-Atlantic. Winter flounder is distributed in the Northwest Atlantic from lower Labrador southward to Georgia, and is most important from the Gulf of St. Species Information: Winter flounder Species Information: Winter Flounder Winter Flounder, Pseudopleuronectes americanusB. ![]()
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