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Oblique plankton hauls were taken 1 to 3 times a month during 1982 and 1983 off Plymouth, England. Sagitta setosa occurred in low numbers during spring and early summer but increased in late summer and autumn. This seasonal increase can be attributed to reproduction and in part to immigration from outside the sampling area as a result of advection. S. setosa in the western Channel was much larger during winter and spring compared to S. setosa in the northern Kattegat, an area with much lower temperature. This indicates that temperature may be an important growthregulating factor (direct and/or indirect) for this species. S, setosa had a 1 yr life cycle. Breeding occurred over a long period, from June to December, with a peak from July to early October. In the 1930's F. S. Russell proposed 6 generations a year for S. setosa off Plymouth. Considering the large mesh size of the plankton net, and the occurrence of different populations due to advection, his results can be reinterpreted as agreeing with the new data.

Temporal distribution of size and maturity stages of the chaetognath Sagitta setosa in the western English Channel