From southbound cane toads to invasive weeds and fluctuating fish stocks, a novel technique called eDNA has revealed what's in NSW waterways—and how it's influenced by natural disasters.

You need to be where the food is with ideally fast moving water that tosses bait around making them easy pickings for larger fish.

arranged in 84 host fish species. This work carried out in the floodplain of the upper Paraná River contributes to the listing of parasite species and host interactions of the local ichthyofauna.