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Presented by Peter Gehrke

Projected changes to freshwater fish stocks. Presented by Peter Gehrke. Key messages. Freshwater fisheries are important in Fiji!!! Increased rainfall will increase freshwater habitats in tropical regions, less in subtropics Freshwater fish production increase by 5 – 20%

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Presented by Peter Gehrke

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  1. Projected changes to freshwater fish stocks Presented by Peter Gehrke

  2. Key messages • Freshwater fisheries are important in Fiji!!! • Increased rainfall will increase freshwater habitats in tropical regions, less in subtropics • Freshwater fish production increase by 5 – 20% • Disturbed catchments restrict production • Five adaptations to maximise positive outcomes and minimise negative effects

  3. Freshwater fisheries in Fiji • Fijian catch > 4,000 t/y, total 24,000 t/y • 3% of wild catch value • Dominated by invertebrates • Subsistence and commercial value • Part of culture and language

  4. Climate change effects

  5. Flow – the Maestro

  6. Effects of altered rainfall Freshwater fish catches typically correlated to river flows

  7. Temperature • Sex ratios • Growth rates • Larvae feed earlier (starvation?) • Muscle development • Pollutants increase sensitivity (lower temp tolerance)

  8. Sea level Barriers (waterfalls, weirs, culverts) may block retreat of freshwater fish and clams

  9. Projected habitat changes

  10. Effects on fisheries

  11. Projected fisheries changes

  12. Adaptation recommendations • Improve habitat management to reduce exposure and sensitivity to climate change

  13. Adaptation recommendations • Build capacity of local communities to manage habitats and fisheries resources

  14. Adaptation recommendations • Adopt more efficient fishing methods and limit fishing effort

  15. Adaptation recommendations • Manage threats from invasive species

  16. Adaptation recommendations • Monitor catches and measure the success of management interventions

  17. In summary … The outcomes of climate change for Fiji’s freshwater fisheries will be determined by the effectiveness of strategies to minimise human impacts at the catchment scale.

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