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Spawning efficiency and estimate of year-class strength of Atlantic-Scandinavian herring in 1961


, : Spawning efficiency and estimate of year-class strength of Atlantic-Scandinavian herring in 1961. Vopr Ikhtiol 3(3): 497-505

In April of 1961, sampling operations were conducted for herring larvae with fish-plankton nets along the herring breeding grounds on the West Scandinavian shelf and in the shallows surrounding the Faeroe Islands. Nets were conical, of No. 140 silk mesh, with entrance diameters of 80 cm; three to four were attached at one time at 50 m intervals to a Hercules trawl line for vari-depth sampling. In the falls of 1959-1962, samples (from 0.150 m) were taken with 25-meter commercial trawls, 8-10 mm mesh size to sample the numbers of herring young outside the breeding grounds in the Barents Sea. Most of the larvae were taken at a depth of 100-150 m. The number of herring larvae on the breeding grounds in 1961 (240 per trawl) was not less than average, and was more than in 1959 (139 per trawl) but less than in 1960 (512 per trawl). In view of the heavy numbers of 2nd and 3rd year herring young taken in the fall of the 1959 and 1960 spawnings, it is believed that the relatively large numbers of the 1961 generation will significantly enhance future herring supplies. Furthermore, the herring supply should be increased considerably from 1964 onward, when the 1959 generation matures. The presence of three rather large year-classes of herring young should bring about the expansion of herring distribution in the northern part of the Norwegian Sea during the summer feeding period, the region from the threshold of Mon to West Spitzbirgen becoming important.

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