Freshwater Trust Allocation

2008/09 - $133,600

Aim

To restore the viability of freshwater catfish populations in the Murray-Darling Basin by identifying the population structure of catfish and suitable re-introduction sites.

Background

Freshwater catfish (Tandanus tandanus) were formerly very abundant across most of the Murray-Darling Basin in inland New South Wales. Prior to the 1980s, they provided recreational fishing opportunities and they are still considered one of the premier table fish by many country people. However, catfish numbers declined substantially following the invasion of carp during the 1970s and 80s. In addition to carp, thermal pollution and season flow reversal also have major impacts in affected reaches. Catfish have virtually disappeared from the Murray, Murrumbidgee and Lachlan catchments are now one of the rarest species of native fish in many waterways across their natural range. The only inland waterways that still support catfish fisheries are those upstream of dams or waterfalls that carp have not invaded. Catfish are still relatively common in coastal catchments North of Newcastle.

This study will investigate the natural population genetic structure of freshwater catfish across their range, including their habitat requirements. Collaborations will be formed with recreational fishing clubs to assist with the collection of samples in these catchments. Following the genetics work, suitable re-introduction sites will be identified, prioritised, and any necessary rehabilitation activities undertaken, as a precursor to development and implementation of a catfish stocking program.