Intensive trapping and increased fish predation cause massive population decline of an invasive crayfish

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The perfect invader: a parthenogenic crayfish poses a new threat to Madagascar’s freshwater biodiversity (2009, background): “Intensive trapping combined with reduced harvesting of fish known to prey on juvenile crayfish has been successfully used to reduce, but not eradicate, invasive crayfish populations in the USA ( Hein et al. 2007 ).”
Biological control of invasive populations of crayfish: the European eel (Anguilla anguilla) as a predator of Procambarus clarkii (2010, background): “A number of interventions that attempted to restore the populations of predatory fish have shown to be effective in reducing the size of the invasive crayfish populations, particularly if accompanied by intensive trapping (e.g. in Sparkling Lake, USA; Hein et al. 2007 ).”
Invasive alien Crustacea: dispersal, establishment, impact and control (2011, background): “As a result, crayfish catch rates declined by 95%, from 11 crayfish per trap per day in 2002 to 0.5% crayfish in 2005, and the native community showed a slow but steady recovery (Hein et al. 2007).”
Managing invasive crayfish: is there a hope? (2011, methodology): “Overall, five summers of intensive trapping and fisheries management practices led to the removal of 88,602 crayfish, corresponding to a biomass of 1,193 kg, and to a steady recovery of the native community (Hein et al. 2006, 2007).”