Otolith chemistry delineates the influence of natal origin, dispersal and flow on the population dynamics of golden perch (Macquaria ambigua) in a regulated river
Brenton P Zampatti, Sandra J Leigh, Phillipa J Wilson, David A Crook, Bronwyn M Gillanders, Roland Maas, Jed I Macdonald, Jon Woodhead
MARINE AND FRESHWATER RESEARCH | CSIRO PUBLISHING | Published : 2021
For riverine fishes threatened by fragmentation and flow modification, effective management requires an understanding of when and where key life history processes (spawning, recruitment and movement) take place. The structural and chemical properties of otoliths provide a unique means to recount a fish's life in time and space. We investigated the age structure of the migratory, pelagic-spawning golden perch (Macquaria ambigua) in the Murray River, Australia, and used water and otolith 87Sr/86Sr ratios to delineate the natal origin and movement of fish from discrete cohorts. Water 87Sr/86Sr was distinct among the Darling River (a major tributary) and lower and mid-Murray River. Otolith chemi..View full abstract
This project was funded by the South Australian Department of Environment and Water and the Commonwealth Environmental Water Office.