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1977. Seasonal migration of North Pacific albacore, Thun- 

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Laurs, R. M., and J. A. Wetherall. 



1981. Growth rates of North Pacific albacore, Thunnus 

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1960. Phytohaemagglutinin: an initiator of mitosis in culture 

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1963. Model of the migration of albacore in the North Pacific 

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1970. Chromosome localization of mouse satellite DNA. 

 Science 168:1356-1358. 

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1981 . Distribution of C-band heterochromatin in the ZW sex 

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1978. Giesma-banding in fish chromosomes. Current 

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Thorgaard, G. H. 



1976. Robertsonian polymorphism and constitutive hetero- 

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San Diego State University 

 San Diego, CA 92182 



San Diego State University 



San Diego, CA 92182 



Present address: 



Wuhan University 



Wuhan, Peoples Republic of China 



Southwest Fisheries Center 



National Marine Fisheries Service, NOAA 



P.O. Box 271, 



La Jolla, CA 92038 



F. J. Ratty 



Y. C. Song 



R. M. Laurs 



ABUNDANCE, SIZE, AND SEX RATIO OF 



ADULT SEA-RUN SEA LAMPREYS, 



PETROMYZON MARMUS, 



IN THE CONNECTICUT RIVER 1 



Populations of sea-run sea lampreys, Petromyzon 

 marinus, occur in many rivers on the east coast of 

 North America from Labrador to Florida (Bigelow 

 and Schroeder 1953). The Connecticut River in the 

 northeastern United States is believed to have the 

 largest population (Beamish 1980). Although the 

 historical, upstream range of the sea lamprey in the 

 Connecticut River is not known, it probably was 

 similar to American shad, Alosa sapidissima, which 

 migrated 280 km upstream to Bellows Falls, VT 

 (Moffitt et al. 1982). 



Upstream migration of anadromous fish species 

 in the Connecticut River main stem was first re- 

 stricted in 1798 by the construction of Turners Falls 

 Dam at km 197, and further in 1849 by the construc- 

 tion of Holyoke Dam at km 140. The first upstream 

 fish passage facility for anadromous fish was a fish 

 lift at Holyoke Dam that began operating in 1955. 

 Until 1969 the sea lampreys using the fish lift were 

 counted and either killed or thrown back. From 1969 

 to 1984, they have been passed upstream each year. 

 Sea lampreys have also used the fish ladders that 

 were completed in 1980 and 1981 at Turners Falls 

 and Vernon Dams, respectively. With the comple- 

 tion of the fish ladder at Bellows Falls Dam in 1984, 

 migrants now have access to 350 km of main-stem 

 river and many additional tributaries (Fig. 1). 



The present report summarizes the annual counts 

 of sea lampreys from 1958 to 1984 at the two Holy- 

 oke fish lifts (a second fish lift was added in 1976). 

 We also examined the sex ratio, total length, and 

 weight of adults in 1981-82 and compared these 

 characteristics with those of the population in the 

 St. John River, New Brunswick. Beamish et al. 

 (1979) sampled the St. John River population at km 

 140, at a fish lift located at Mactaquac Dam. 



Methods 



Sea lampreys that were lifted above the dam were 

 counted each year from 1958 to 1984, except for the 

 period from 1969 to 1974. From 1958 to 1968, sea 

 lampreys were counted by personnel of the Holyoke 

 Water Power Company (the owner of the dam), and 



Contribution No. 95 of the Massachusetts Cooperative Fishery 

 Research Unit, which is supported by the U.S. Fish and Wildlife 

 Service, Massachusetts Division of Fisheries and Wildlife, Mass- 

 achusetts Division of Marine Fisheries, and the University of 

 Massachusetts. 



476 



FISHERY BULLETIN: VOL. 84, NO. 2, 1986. 



