Nutrient rich conditions and a temperate climate favour the proliferation of
non-indigenous fish in the Southern Hemisphere. These fish assimilate
nutrients into their flesh and also release nutrients, re-directing the
pathway of energy transfer and use in aquatic systems. We describe an
invasive fish ‘recycling’ programme where selective capture of invasive fish
and their digestion by thermophilic bacteria creates a nutrient rich fish
meal. Developing products from these fish for use in other restoration and
conservation projects is a key objective. We showcase two trials; a dune
planting experiment where pelletized meal is compared against artificial
fertiliser tablets to replace nutrients once provided to dunes by nesting sea
birds. The second trial demonstrates use of the material in trapping
programmes as a lure for controlling other problematic invasive terrestrial
pests. A similar concept could be applied elsewhere where large numbers
of invasive species are amenable to efficient point source control.