Budget expenditure: $411,817.00
Project Status:
Current
Principal Investigator: Eva Plaganyi-Lloyd
Organisation: CSIRO Geelong Waurn Ponds
Project start/end date: 6 Jan 2019 - 28 Jan 2021
Contact:
FRDC
TAGS
Resource Access And Allocation
Modelling
Habitat
Fishing Effort
Fisheries Management
SPECIES
Barramundi
Mud Crabs
Banana Prawns
Tiger Prawns

Need

River flow is crucial in the life cycle of prawns that support the Northern Prawn Fishery (NPF), as well as iconic tropical species (e.g. mud crab, barramundi, grunter, and threadfin salmon) of importance to commercial, recreational and Indigenous fisheries, and species with high conservation (e.g. sawfish) and cultural value. Substantial interest in developing irrigated agriculture across northern Australia is reviewed in a recent FRDC report (Kenyon et al. 2018). Water extraction to support agriculture will modify natural flow regimes that support estuarine and coastal fisheries. The trade-offs associated with proposed water resource allocation are currently unknown and research is needed to support decision making related to alternative strategies for managing water resources effectively for both agriculture and marine production and biodiversity conservation. Quantifying these trade-offs entails evaluating how altered river flows might affect the fishery and ecological values. Most work to date has focused on the hydrological rather than ecological aspects (and particularly how to quantify aspects such as the minimum water requirements for ecological components) as managers otherwise need to make decisions without sufficient research and given limited timeframes. Although previous and recent projects such as NAWRA have evaluated the qualitative impacts of changes in river flows on ecological assets, there is a need to quantify impacts both for consideration by affected commercial, recreational, indigenous and other sectors, as well as to provide water resource managers with quantitative estimates such as the minimum water requirements to maintain ecosystem structure and functioning. Such analyses are also complicated by the fact that each catchment is different, and hence models and the associated recommendations need to be tailored to be specific to each catchment area, and there is currently no suitable ecosystem model at the appropriate scale and incorporating key relationships.

Objectives

1. Develop a MICE model that integrates existing data and understanding, and in consultation with stakeholders, to quantify the impacts on key marine species of alternative water extraction scenarios
2. Produce quantitative estimates of the impact of alternative flow regimes on the relative abundance of key fishery and other marine species in the Gulf of Carpentaria, as well as impacts on total fishery catches and value
3. Summarise findings in a technical report and non-technical reports to support sharing findings and engaging in other relevant broader management fora

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