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UNIT 1:

UNIT 1:. Threats to sustainable fisheries. Internal threats. Activity 1.1: List three (3) potential threats to fisheries. INTERNAL THREATS Overfishing – Retained species (target & by-product) Bycatch species Growth overfishing Recruitment overfishing

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UNIT 1:

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  1. UNIT 1: Threats to sustainable fisheries

  2. Internal threats • Activity 1.1: List three (3) potential threats to fisheries. • INTERNAL THREATS • Overfishing – • Retained species (target & by-product) • Bycatch species • Growth overfishing • Recruitment overfishing • Activity 1.2: Discuss local examples of fishing impacts using a timeline.

  3. Internal threats • Destructive fishing – explosives, poisons, trawling. • Ecosystem impacts – see ecosystem foodweb (next slide)

  4. Ecosystem impacts Activity 1.2: Discuss local examples of fishing impacts using a timeline.

  5. External threats • EXTERNAL THREATS • Downstream (catchment) impacts – farming, mining, agriculture, coastal development.

  6. External threats cont. • Illegal foreign fishing • Climate change • Direct effects on species • Indirect effects through habitat modification • Changes include temperature, rainfall, ocean pH, currents, sea level • Externally sourced pollutants • Pollution from other catchments/countries • Discarded nets (ghost fishing) • Other marine debris

  7. Local threats • Activity 1.3: Using the examples of local fishery threats identified earlier, rank them from most dangerous to least.

  8. Key threats in PICTs

  9. Threats • Shifting ecological baselines • What is a healthy ecosystem? • Each generation has a different ‘baseline’ • Historical knowledge important • DVD – Plenty more fish in the sea? • Consequences of threats to fisheries • Altered ecosystem structure and functioning • Altered species composition • Social and economic impacts • Must therefore manage ALL parts of the ecosystem

  10. Threats • Activity 1.4: In groups write down some local examples of social, economic and cultural consequences of negative fishery impacts? One person from each group to present back to the class.

  11. Unit review • THREATS TO FISHERIES • Internal threats • External threats • Threats impact on the entire ecosystem • Shifting ecological baselines

  12. Unit review • 15 minute personal review: unit review, students to review main concepts of unit in the course notes, contribute any new words (new to them) to their own personal glossary in the back of their notebook (local language equivalent terms should also be recorded where possible) • Homework • Interview your parents/grandparents/older neighbour about shifting baselines and their past fisheries experience compared with today. (Report back the next class)

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