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Progressive epide rmal p igmentation of Anguilla rostrata elver s in a coastal Rhode Island stream was essentially identical to that de scr ibe d for ~ anguilla, and proceeded rapidly in fr eshwater. Earlier arriving elvers averaged larger than those arriving later in the season, paralleling studies of European elvers. Mea n tot al lengths of elver s collected in 1984 wer e significantly greater than those for 1983 and ar e the lar ge s t re corded for t he Western North Atlantic. Thes e differ ences may be due to sampling technique. Migration of e lv ers into freshwater may be i nduc ed by decreasing flow rates and /or increasing stream temperature s . The relatively slow upstream migratio n of elvers in the lower sect io n of the stream (a pproximately 200 m per month) is attributed to high stre am gradient and t he presence of obstructions. By late summer and early fall, elvers (age I+) had acquired t he coloration typical of yellow eels and had grow n 20 t o 30 mm larger than elvers arriving in freshwater in late winter and spring . The frequency of II+ and older eel s increased with incr e asing d i s ta nce from the tidal zone. Th is indi ca tes that the upstream mi grati on of e lvers is limited, and that the colonization o f inland wate r s is accomplishe d mainly by yellow eels in their second and later years of continental life.

Size, Development of Pigment, Upstream Migration, and Relative Abundance of Young American Eels, Anguilla rostrata in a Coastal Rhode Island Stream