The purpose of this note is to report additional cases of predation by fish on horsehair worms. These provide new insight into the potential importance of predation as a source of mortality in this group.
Evidence for predation on horsehair worms was obtained opportunistically subsequent to fish collections by seining or angling.
Identification of horsehair worms to species can be difficult (Poinar 2001, Smith 2001).
We found horsehair worms in the digestive tracts of two fish species at seven locations in Missouri and Minnesota:
(2) Horsehair worms were found in three of five brown trout (Satmo trutta) collected by angling on 20 June 1999 in Gilmore Creek on the St.
This sample of trout was collected approximately 2 km downstream from a site where a trout that contained horsehair worms was collected in 1995 (Cochran et al.
As in the present account, many previously reported cases of predation on horsehair worms involved fishes of the families Centrarchidae and Salmonidae (Cochran et al.
Our results, along with those of McLennan and MacMillan (1984), suggest that predation on horsehair worms may occur in at least some habitats at frequencies greater than what is implied by the primarily anecdotal reports summarized by Cochran et al.