Distribution, development, and production ofCalanus finmarchicus(gunnerus) in Lindåspollene, western Norway, 1979

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Abstract
The Calanus finmarchicus population in Spjeldnesosen, a ‘poll’ in the landlocked fjord system, Lindåspollene, in western Norway was investigated during 1979 and early 1980. The bottom water was renewed during the winter 1978–1979. This led to a well aerated water column in 1979 compared to earlier years. Differences were observed between the horizontal distributions of the various copepodid stages. This is thought to be due to migration away from the shore as the individuals grew older. One yearly generation with one spring spawning was observed. Residence times were estimated as 2, 4, 6, 13, and 250 days for copepodid stages I to V respectively. The estimated mortality was greater than 10 % per day when the younger stages were represented in the samples, and less than 1 % per day when stage V was dominant. Of about 72 000 ind./m2 recruited to copepodid stage I, about 800 ind./m2 of the total population survived until the end of 1979. Estimated production was 1 g dry weight/m2 per year on the average for Spjeldnesosen, and 3.6 g dry weight/m2 per year in the deep central area of Spjeldnesosen.