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Fishing the marine food web along the Indian coast

Fishing the marine food web along the Indian coast. 印度沿岸水域因 漁業捕撈影響食物網變動情形. Fisheries Research 74 (2005) 223–231. E. Vivekanandan*, M. Srinath, Somy Kuriakose. 報告者 : 何珈欣. Outline. Introduction Objectives Material & Method Result Discussion and conclusions. Introduction. NW COAST.

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Fishing the marine food web along the Indian coast

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  1. Fishing the marine food web along the Indian coast 印度沿岸水域因漁業捕撈影響食物網變動情形 Fisheries Research 74 (2005) 223–231 E. Vivekanandan*, M. Srinath, Somy Kuriakose 報告者:何珈欣

  2. Outline Introduction Objectives Material & Method Result Discussion and conclusions

  3. Introduction

  4. NW COAST Indian NE COAST INDIA SE COAST SW COAST BAY OF BENGAL ARABIAN SEA

  5. Objectives

  6. Pauly et al. (1998) called “fishing down marine food webs”. • Along the Indian coast, there has been an unprecedented expansion of fishing fleets in the last half century in the present paper, the trend in fishing the marine food web along the Indian coast during 1950–2002 has been analysed.

  7. Statistics of Indian coast catch Material & Method Trophic category Mean trophic level(MTL) Fishing-in-balance index(FIB)

  8. Material & Method-1 Mean trophic level(MTL) MTL:The mean trophic level of landing in year j Yij :The landing of species i in year j TLi:the trophic level of species i

  9. Material & Method-1 Top predator Mid-level carnivores Herbivores Omnivores Trophic levels

  10. Material & Method-2 Fishing-in-balance index(FIB) Yi :Landing at year i TE:trophic efficiency (here set at0.10) Y0 and TL0are the landing and mean TL of the first year of the series

  11. Material & Method-2 FiB=0 Trophic levels

  12. Material & Method-2 FiB=(+) Trophic levels

  13. Material & Method-2 FiB=(-) Trophic levels

  14. Material & Method-3 Trophic category • Trophic category 1 (TrC1) • herbivores, detritivores and omnivores (TL:2.00–3.00) • Trophic category 2 (TrC2) • mid-level carnivores (TL: 3.01–3.50) • Trophic category 3 (TrC3) • high-level carnivores and top predators (TL: >3.51)

  15. Material & Method-3 Trophic category 1 (TrC1) Vivekanandan et al., in press

  16. Material & Method-3 Trophic category 2 (TrC2) Mid-level carnivores (TL: 3.01–3.50)

  17. Material & Method-3 Trophic category 3 (TrC3) Mid-level carnivores (TL: 3.01–3.50)

  18. Result

  19. NE NW SE SW Result Table 1 Decadal changes in mean TrL and FIB and TrC values TrC2 TrC2

  20. Result Southwest coast (SW) Trends in parameters related to fishing the food web along the southwest coast

  21. Result 1980 Southeast coast (SE) Trends in parameters related to fishing the food web along the southeast coast

  22. Indian coast Trends in parameters related to fishing the food web along the Indian coast

  23. Discussion 1.The Environment condition 2.Advancement of fishing technologies

  24. Corrleation analysis of TrL and FIB with total catch and catch of each TrC Table2.Corrleation analysis of TrL and FIB with total catch and catch of each TrC

  25. Discussion-1 The Environment condition • The surface chlorophyll and the biomass of benthic organisms • in the Arabian Sea is very high compared to the Bay of Bengal in • the east coast . • Whereas upwelling enhances the productivity and abundance of • planktivores along the SW and abundance of demersals along the • NW coast. Along the SW the fishery is driven by upwelling and • other environmental variabilities, and rarely shows stability.

  26. Discussion-2 Advancement of fishing technologies Table1.Fisheries profile of four coastal zones in the Indian mainland

  27. Advancement of fishing technologies Discussion-2 The trawlers progresses continuously during the 1960~2000. • Fishing the food web could be influenced by the impacts of • advancement of fishing technologies.

  28. Thank You

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