Individual study: Can resident carnivorous fishes slow down introduced alien crayfish spread? Efficacy of 3 fishes versus 2 crayfish species in experimental design.
Neveu A (2001) Can resident carnivorous fishes slow down introduced alien crayfish spread? Efficacy of 3 fishes versus 2 crayfish species in experimental design. Bulletin Francais De La Peche Pisciculture, 361, 683-704
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Procambarus crayfish control: Encouraging predators
One replicated, controlled study in France (Neveu 2001) in 2001 found that pike Esox lucius predated red swamp crayfish. Pike of 40-50 cm could eat crayfish above 8 cm in length, although smaller pike tended to eat smaller crayfish. Predation remained equally high when fish prey (rudd) were available as an alternative source. Experiments were conducted in experimental water enclosures measuring 3 x 5m placed within small ponds. Crayfish refuges were created from tree branches and pike refuges from floating sheets of polystyrene. Six water enclosures contained pike of 16-46 mm length. Four of these had small rudd as alternative food for the pike. Red swamp crayfish of wide size range were added ad libitum to each pond and predation allowed for 15 days. Two additional control enclosures included crayfish added in the absence of any pike. No mortality was observed. Crayfish mortality was measured by draining ponds and collecting the remaining crayfishes.