Projected changes to freshwater fish habitats and stocks
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Projected changes to freshwater fish habitats and stocks. Based on. Outline. Importance of flow Connectivity of freshwater habitats Effects of climate change Habitats Fisheries production Importance of catchment management. Freshwater fisheries in the region. Catch 24,000 tonnes per year

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Outline
Outline

  • Importance of flow

  • Connectivity of freshwater habitats

  • Effects of climate change

  • Habitats

  • Fisheries production

  • Importance of catchment management


Freshwater fisheries in the region
Freshwater fisheries in the region

  • Catch 24,000 tonnes per year

  • 4% of GDP derived from fisheries

  • Consumption up to 100 kg per year

Photo Jacob Wani




Flow responses to rainfall
Flow responses to rainfall

Daily flow, Nabukavesi Creek, Fiji

Episodic flow, Tontouta River, New Caledonia

Seasonal flow, Ba River, Fiji




Effects on freshwater are different
Effects on freshwater are different!

  • Climate change will affect the quantity of freshwater habitat available to fisheries

  • Changes in water quality and habitat quality will be secondary to changes in flow



Temperature and co 2
Temperature and CO2

Photo: David Boseto

  • Increasing CO2 will promote growth of aquatic and riparian vegetation


Sea level
Sea level

  • Barriers (waterfalls, weirs, culverts) may block retreat of freshwater habitats




Effects on fisheries
Effects on fisheries

Photo: Erin Michelle Smith



Adaptation recommendations
Adaptation recommendations

  • Maintain vegetation in catchments to avoid sediments and nutrients entering waterways

Photo: Joanna Ellison


Adaptation recommendations1
Adaptation recommendations

  • Build capacity of local communities to manage habitats and fisheries resources

Photo: Joanna Ellison


Adaptation recommendations2
Adaptation recommendations

  • Adopt more efficient fishing methods and limit fishing effort

Photo: Boga Figa

Photo: Boga Figa


Adaptation recommendations3
Adaptation recommendations

  • Manage threats from invasive species

Photo: Boga Figa


Adaptation recommendations4
Adaptation recommendations

  • Monitor catches and measure the success of management interventions

Photo: Jacob Wani


Putting climate change in perspective
Putting climate change in perspective

‘In tropical systems it is possible that the effects of global climate change will be overshadowed by other, larger disturbances such as deforestation and land-use changes.’ (Ficke et al. 2007)

Photo: Jacob Wani


Summary
Summary

  • Increased rainfall will increase freshwater habitats in tropical regions, less in subtropics

  • Freshwater fish production may increase by 5-10%

  • Disturbed catchments restrict production

  • Ridge to reef management is needed to maximise positive outcomes and minimise negative effects


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