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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Projected changes to freshwater fish habitats and stocks

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Projected changes to freshwater fish habitats and stocks

Projected changes to freshwater fish habitats and stocks


Based on

Based on.......


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


Diversity of freshwater habitats

Diversity of freshwater habitats


Flow the maestro

Flow – the Maestro


Flow responses to rainfall

Flow responses to rainfall

Daily flow, Nabukavesi Creek, Fiji

Episodic flow, Tontouta River, New Caledonia

Seasonal flow, Ba River, Fiji


Range of freshwater habitats

Range of freshwater habitats


Climate change effects

Climate change effects


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


Effects of altered rainfall

Effects of altered rainfall


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


Projected habitat changes

Projected habitat changes


Interactions in disturbed catchments

Interactions in disturbed catchments

Source: Google Earth


Effects on fisheries

Effects on fisheries

Photo: Erin Michelle Smith


Projected fisheries changes

Projected fisheries changes


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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