Projected changes to coastal fisheries
This presentation is the property of its rightful owner.
Sponsored Links
1 / 27

Projected changes to coastal fisheries PowerPoint PPT Presentation


  • 84 Views
  • Uploaded on
  • Presentation posted in: General

Projected changes to coastal fisheries. Based on. What we will discuss. Projected changes to atmospheric and oceanic conditions. Ecosystems supporting fish. Fish stocks/aquaculture species. Implications for economic development, food security and livelihoods.

Download Presentation

Projected changes to coastal fisheries

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Projected changes to coastal fisheries

Projected changes to coastal fisheries


Based on

Based on......


Projected changes to coastal fisheries

What we will discuss

Projected changes to atmospheric and oceanic conditions

Ecosystems supporting fish

Fish stocks/aquaculture species

Implications for economic development, food security and livelihoods

Adaptations and policies to reduce threats and capitalise on opportunities


Importance of coastal fisheries samoa

Importance of coastal fisheriesSamoa

8600

Production (tonnes)

2540

?

10

Aquaculture Freshwater Coastal Offshore


Importance of coastal fisheries is typical of region

Importance of coastal fisheriesis typical of region


What are coastal fisheries

What are coastal fisheries?

  • Demersal fish

  • Nearshorepelagics

  • Invertebrates

Species not considered

  • Deepwater snapper

  • Sharks


Demersal fish

Demersal fish


Nearshore pelagic fish

Nearshore pelagic fish


Invertebrates

Invertebrates


Coastal fisheries samoa

Coastal fisheries - Samoa

1665 t/yr

4420 t/yr

2550 t/yr


Indirect effects of climate change

Indirect effects of climate change

Coral cover


Projected changes to coastal fisheries

65% decline in abundance and diversity of fishes


Projected changes to coastal fisheries

Effects of habitat degradation

0.5

0

-0.5

-1

Macroalgae

Proportional change

Habitat

complexity

Coral cover

0 1 2 3 4 5 6 7 8 9 10

Time after extensive coral loss (years)


Projected changes to coastal fisheries

Effects of habitat degradation

0.5

0

-0.5

-1

Macroalgae

Proportional change

Habitat

complexity

Coral reef fishes

Coral cover

0 1 2 3 4 5 6 7 8 9 10

Time after extensive coral loss (years)


Projected changes to coastal fisheries

Catch composition

GeneralistsNot vulnerable

Reef associatedVulnerable

Coral associatedHighly vulnerable


Projected changes to coastal fisheries

Catch composition - Samoa

Catch

Species composition

Percentage

Source: Pratchett et al. 2011


Direct effects of climate change

Direct effects of climate change

pH

Temperature


Projected changes to coastal fisheries

Effects of temperature

Growth (mg/week)

Acanthochromis polyacanthus

Maximum growth

28-30oC

Projected increase

3oC by 2100

Temperature (oC)

Zarco Perello and Pratchett 2012


Projected changes to coastal fisheries

Effects of temperature

Declines in:

growth

lifespan

reproduction

Fewer &

smaller

fishes

Growth (mg/week)

Maximum growth

28-30oC

Projected increase

3oC by 2100

Temperature (oC)

Zarco Perello and Pratchett 2012


Projected changes to coastal fisheries

Effects of temperature

Normal spawning temperature


Projected changes to coastal fisheries

Effects of ocean acidification

Abalone

Byrne 2012


Projected changes to coastal fisheries

Effects of ocean acidification

Munday et al 2012


Projected coastal fisheries production samoa

Projected coastal fisheries productionSamoa


Priority adaptations

Priority adaptations

  • Protect the structural complexity and biological diversity of coral reefs, mangroves and sea grasses to sustain fisheries and maximize adaptation potential

  • Recognise ecological importance of herbivorous fishes and ensure their stocks of are sufficient to maintain ecosystem functions


Priority adaptations1

Priority adaptations

3. Diversify coastal fisheries to target species and habitats that will be least affected (or favoured) by climate change

4. Maintain adequate spawning stocks to overcome the shocks of greater climate extremes


Conclusions

Conclusions

  • Coastal fisheries are critically important for both food security and livelihoods

  • Effects of climate change will add to existing pressures (e.g., overfishing)

  • Improved catch data is needed for monitoring effects of climate change on coastal fisheries

    • subsistence fisheries catches

    • separate data for each category of coastal fisheries and species wherever possible


  • Login