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MADE Mitigating adverse ecological impacts of open ocean fisheries

MADE Mitigating adverse ecological impacts of open ocean fisheries. Primary objective: to propose measures to mitigate adverse impacts of fisheries targeting large pelagic fish in the open ocean through appropriate knowledge on the biology and ecology of species, and of the fisheries.

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MADE Mitigating adverse ecological impacts of open ocean fisheries

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  1. MADEMitigating adverse ecological impacts of open ocean fisheries

  2. Primary objective: to propose measures to mitigate adverse impacts of fisheries targeting large pelagic fish in the open ocean through appropriate knowledge on the biology and ecology of species, and of the fisheries Tuna purse seiners using Fish Aggregating Devices (FADs) Pelagic longliners (tuna & swordfish)

  3. Specific objectives of MADETo propose methods: • To reduce by-catch of sharks and juvenile swordfish by pelagic longliners • To reduce by-catch of sharks, turtles and small tuna by tuna purse seiners • To assess the effects of FADs on fish ecology (ecological trap) Silky shark

  4. Geography of MADE Mediterranean Sea PIRACY Longliners Atlantic Ocean Indian Ocean Purse seiners

  5. Longliners • Development of an Ecological Based Artificial Bait ongoing • 60 experimental longline sets (strategies to reduce catches of sharks) in La Réunion • Observers data (DRC) • Economic data (for study on economic efficiency)

  6. Ecological FADs

  7. Ecological FADs 23 skippers were interviewed Deliverable D6.1 Design of ecological FADs (IOTC-2009-WPEB-16) Bamboo, sisal net tied in sausage, palm leaves, etc.

  8. Next steps onEcological FADs • Testing those FADs in fishing conditions • With the help of tuna purse seiners, with 2 independent initiatives from France and Spain (with complementary funds)

  9. Sharks (Technical measures) Releasing sharks from the deck Belt to release bycatch Estimate survival: tagging (pop-up tags)Help of French fishermen (complementary funding) Produce a guide of best practices of sharks onboard PS  Atlantic Ocean

  10. Sharks Improve knowledge on Behaviour (acoustic and pop-up tags, juveniles and adults), Biology (diet, stable isotopes), and Genetics Behaviour: 4 silky sharks (adults) tagged in March 09 (Seychelles): 7 days and 3 months at liberty, 1 dead, 1 non reporting (Workshop in Seychelles) Biology and Genetics: Data from La Réunion (longliners) and soon from tuna purse seiners (French & Spanish, piracy issue)

  11. Get information on species composition from echosounder buoys • Get information before arriving to the FAD • Information on: • Bycatch (triggerfish, rainobow runner, sharks, etc.) • Small tuna • Promising preliminary data (AZTI project)

  12. Spatio-temporal characteristics of bycatch (PS) • Common database IRD-IEO-AZTI (from DRC programme) Analyses start • Economic data collected • Fishers Economic Knowledge (paper to be submitted)

  13. Habitat changes due to release of FADs(IOTC-2009-WPTT-19) • No new « floating object » area • No major change of densities of floating objects South of 7°S • Major changes of densities of floating objects North of 7°S (x20 or x40 in Somalia area)

  14. Maps of spatial distribution of floating objects • (from Observers data) • Would be improved with the help of fishermen: • As observers (objects not fished), see GAP initiative • By providing old data on all tracked FADs (6-12 months delay)

  15. Tuna tagging in MaldivesAnchored FADs • 23 SKJ in Jan 2009 Average Residence Time = 3.3 daysNo movement between FADs independence (confirmed by conventional tagging) • 20 SKJ + 20 YFT (1 archival tag) + 6 Triggerfish + 2 Rainbow runner in Nov 2009

  16. Plans for tagging (Piracy issue) + ISSF Initiative + SWIOFP Somalia Seychelles Maldives Mozambique Channel

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