THE BIOLOGY OF CALANUS FINMARCHICUS IN THE GULF OF MAINE AND BAY OF FUNDY

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Abstract
Between July 28, 1931, and Sept. 29, 1932, 838 zooplankton samples were taken with nets and pump in the Gulf of Maine and Bay of Fundy. Quantitative analyses of adults and developmental stages of C. finmarchicus indicate that this sp. averaged 39.9% of the total summer zooplankton population in the Gulf in 1932 and 35.5% in the Bay for the year 1931-32. An average difference of approximately 1 month in the spawning periods in the eastern and western parts of the region is reflected in succeeding generations and permits a distinguishing of 2 breeding stocks. There are apparently 3 breeding periods in the western stock and 2 in the eastern, with a developmental period of approximately 21/2 months. Mortality is highest in maturing adults. The total length of life of the summer stock does not exceed 4 months, and the winter stock 10-11 months. The western gulf forms the principal source of supply of Calanus for the entire region; east of Mt. Desert propagation is largely if not entirely unsuccessful.

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