Spatially explicit population models for fish...
URL: https://www.mdba.gov.au/sites/default/files/publications/spatially-explicit-population-models-for-fish-in-the-barwon-darling-baaka-river.pdf
Authors: L.M. McPhan, M.E. Shackleton and N.R. Bond
This document outlines the methods, results and discussion on population model use and performance, and management implications.
Key findings/ recommendations
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The model results show that Golden perch and Murray cod are at risk of local extinction under multiple future scenarios.
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These model predictions are reinforced by analyses of population age-structure, which shows that average rates of population growth within the system are well below replacement.
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Low abundances of the younger year classes is a notable feature of the Murray cod populations in the Darling (Baaka), particularly upstream of the Main weir at Menindee. This suggests either a decline in reproductive output or disproportionately high mortality among younger age classes.
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The work reinforces the need to continue to seek to prevent local fish kills and shows there will be long-term population consequences unless these events can be avoided.
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