Emanuele Biggi / Great Fen / Raft spider (Dolomedes plantarius), adult female eating an invasive species of fish, Western mosquitofish, (Gambusia affinis), Alessandria, Italy, August.

Jean E. Roche / Mosquitofish (Gambusia affinis) female, introduced species to control mosquitos, Camargue, France, June. Biological pest control.

Alex Mustard / Female Mosquito fish (Gambusia affinis) swimming above weeds, below the surface of Lago Baratz, Sardinia, Italy. This species is originally from the Americas, but has been introduced into many countri...

MYN / Paul Marcellini / Golden Topminnow (Fundulus chrysotus) Big Cypress National Preserve, FLorida, USA, February. meetyourneighbours.net project

Barry Mansell / Black striped topminnow {Fundulus notatus} Florida, USA