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We used a long-term monitoring data set at station L4 (1988–2004), Western English Channel, to assess the predation pressure by the chaetognath  Sagitta setosa  on the copepod  Calanus helgolandicus . Maximum abundances of  Calanus helgolandicus  are correlated with years when  Sagitta setosa  and the Siphonophore,  Muggiae atlantica , abundances are low, between February and June. As a significant correlation does not necessarily imply a prey–predator interaction, we analysed the gut content of  S. setosa  to investigate the presence or absence of  Calanus helgolandicus  in the chaetognath diet. Molecular analysis of the gut content of three  Sagitta  each month during a year shows that  C. helgolandicus  is present in the diet of  S. setosa  throughout the year. Estimates of  S. setosa  minimal predation pressure suggest that up to 19% of the  C. helgolandicus  population can be removed. Peaks of  S. setosa  follow peaks of  Calanus helgolandicus  total egg production. We suggest that  S. setosa  is an important predator of  C. helgolandicus  at station L4 and might be an important influence on its population dynamics.

Sagitta setosa predation on Calanus helgolandicus in the English Channel