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Production of Juvenile Alewives, Alosa pseudoharengus, at Love, Lake, Washington County, Maine
Author(s) -
Havey Keith A.
Publication year - 1973
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1973)102<434:pojaap>2.0.co;2
Subject(s) - alewife , juvenile , alosa , fishery , geography , biology , fish <actinopterygii> , ecology , fish migration
From 1960–71, 4,601 adult anadromous alewives were counted as they entered Love Lake to spawn. At the 0.05 probability level the observed numbers of males and females did not differ from a 1:1 ratio. Males averaged 295 ± 1.2 mm and females 305 ± 1.3 mm in total length. The length difference between sexes was significant at the 95% confidence level. Average in‐lake mortality of adults was 90.7% (range 66.6% to 100%). Between 1960–71, 1,026,386 juveniles emigrated from Love Lake. Emigrations varied from 220 in 1962 to 439,062 in 1967. Mathematically weighted mean weight of emigrants for the years 1961, 1963–69, and 1971 was 3.5 g. Weight of emigrants (kg/ha) varied from 0.018 to 4.794 per year. Number of emigrants per ha per year varied from 0.81 to 1614.19. Emigrants per female per year ranged from 12 to 3,209. Weight of emigrants per female per year ranged from 0.09 kg to 21.50 kg. There is a significant linear relationship between number of juvenile emigrants and number of adult immigrants 4 years later. There is also a significant linear relationship between log of magnitude of female escapement and log of numbers of juvenile emigrants produced.