Human Ecology

, Volume 47, Issue 3, pp 397–408 | Cite as

Local Fishers’ Knowledge of Target and Incidental Seahorse Catch in Southern Vietnam

  • A. P. StocksEmail author
  • S. J. Foster
  • N. K. Bat
  • N. M. Ha
  • A. C. J. Vincent


Many vulnerable marine species are caught in small-scale fisheries that lack long-term records, thereby limiting the development of effective evidence-based management measures. To uncover recent trends in fish landings and value in the absence of historical data, we interviewed 77 fishers and five buyers on Phu Quoc Island in Southern Vietnam regarding their current and past fishing practices, with a focus on seahorse catches. Seahorses (Hippocampus spp.) are caught using multiple gear types (including trawls, crab nets, and compressor diving) and have both cultural and financial value. Most fishers catch seahorses incidentally, though 14 targeted them and made the majority of their income from their sale. Fishers reported that seahorse catch rates decreased by 86–95% from 2004 to 2014, while landed value simultaneously increased by 534%. If these reports are accurate, seahorse fishing on Phu Quoc is unsustainable and requires immediate management controls.


Seahorses Fisher interviews Trawling Diving Catch decline Target Bycatch Fisheries management Phu Quoc island South Vietnam 



This is a contribution from Project Seahorse. This study was made possible through collaborations with the Research Institute of Marine Fisheries, Viet Nam National University, the Viet Nam CITES Management Authority, and the Phu Quoc MPA staff. Many thanks to Do Thanh An and Nguyen Nhut Thanh, who provided assistance with data collection, translations, and logistics. Thank you to C. Kinzett, K. Gillespie, and others for their support and reviews. We greatly appreciate the support for this research provided by Mitacs and The Explorers Club, and the additional support provided by Guylian Chocolates Belgium, and an anonymous donor.


This study was funded in part through a Mitacs Globalink Research Award and an Explorers Club grant.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

Supplementary material

10745_2019_73_MOESM1_ESM.docx (16 kb)
ESM 1 (DOCX 15 kb)


  1. Alfaro-Shigueto, J., Mangel, J. C. J., Pajuelo, M., Dutton, P. H., Seminoff, J. a., and Godley, B. J. (2010). Where small can have a large impact: Structure and characterization of small-scale fisheries in Peru. Fisheries Research 106: 8–17. Scholar
  2. Aylesworth, L., Phoonsawat, R., Vincent, A.C.J. (2017). Effects of indiscriminate fisheries on a group of small data-poor species in Thailand. ICES Journal Marine Science.Google Scholar
  3. Béné, C., Macfadyen, G., Allison, E. (2007). Increasing the contribution of small-scale fisheries to poverty alleviation and food security. Food and Agriculture Organization United Nations No. 481.Google Scholar
  4. Berkes, F. (2003). Alternatives to conventional management: Lessons from small-scale fisheries. Environments 31: 5–20.Google Scholar
  5. Berkes, F., Colding, J., and Folke, C. (2000). Rediscovery of traditional ecological knowledge as adaptive management. Ecological Applications 10: 1251–1262.CrossRefGoogle Scholar
  6. Berkes, F., Mahon, R., McConney, P., Pollnac, R., and Pomeroy, R. (2001). Managing small-scale fisheries: Alternative directions and methods, International Development Research Centre, Ottawa.Google Scholar
  7. Botsford, L., and Brumbaugh, D. (2009). Connectivity, sustainability, and yield: Bridging the gap between conventional fisheries management and marine protected areas. Reviews in Fish Biology and Fisheries 19: 69–95.CrossRefGoogle Scholar
  8. Bryman, A., 2012. Social research methods. Oxford University Press.Google Scholar
  9. Caddy, J. (1999). Fisheries management in the twenty-first century: Will new paradigms apply? Reviews in Fish Biology and Fisheries 9: 1–43.CrossRefGoogle Scholar
  10. Chen, F., Chen, T., and Kung, Y. (2007). Use frequency of traditional Chinese medicine in Taiwan. BMC Health Services Research 7: 26.CrossRefGoogle Scholar
  11. Christensen, V., Coll, M., Piroddi, C., Steenbeek, J., Buszowski, J., and Pauly, D. (2014). A century of fish biomass decline in the ocean. Marine Ecology Progress Series 512: 155–166. Scholar
  12. Chuenpagdee, R., Liguori, L., Palomares, M., and Pauly, D. (2006). Bottom-up, global estimates of small-scale marine fisheries catches. Fish. Cent. Res. Reports 14: 105.Google Scholar
  13. CITES, 2004. Trade in seahorses – Implementation of decision 12.54, notification to the parties no. 2004/033.Google Scholar
  14. CITES, 2013a. Implementation of resolution Conf. 12.8 (rev. CoP13), review of significant trade in specimens of appendix-II species, notification to the parties no. 2013/013.Google Scholar
  15. CITES, 2013b. Building in-country capacity to undertake Non-Detriment Findings with regard to Hippocampus species in Indonesia , Thailand and Viet Nam. Geneva, Switzerland.Google Scholar
  16. CITES, 2016. How CITES works [WWW document]. URL (accessed 4.21.16).
  17. CITES, 2018. Review of recommendations to suspend trade made more than two years ago, in: Review of significant trade in specimens of appendix-II species: SC70. p. 11.Google Scholar
  18. FAO, 2004. The state of world fisheries and aquaculture, in: Food and agriculture Organization of the United Nations. Rome.Google Scholar
  19. Foster, S. J., and Vincent, A. C. J. (2004). Life history and ecology of seahorses: Implications for conservation and management. Journal of Fish Biology 65: 1–61. Scholar
  20. Foster, S.J., Vincent, A.C.J. (2016). Making non-detriment findings for seahorses - a framework, version 4. Vancouver, Canada.Google Scholar
  21. Foster, S. J., Aylesworth, L., Do, H. H., Bat, N. K., and Vincent, A. C. J. (2017). Seahorse exploitation and trade in Viet Nam. Fish. Cent. Res. Reports 25: 50.Google Scholar
  22. Foster, S., Kuo, T., Wan, A., Vincent, A. (2018). Global seahorse trade defies export bans under CITES action and national legislation.Google Scholar
  23. Giles, B. G., Ky, T. S., Hoang, D. H., and Vincent, A. C. J. (2006). The catch and trade of seahorses in Vietnam. Biodiversity and Conservation 15: 2497–2513. Scholar
  24. Harley, S., Myers, R., and Dunn, A. (2001). Is catch-per-unit-effort proportional to abundance? Canadian Journal of Fisheries and Aquatic Sciences 58: 1760–1772.CrossRefGoogle Scholar
  25. Hilborn, R., Stokes, K., and Maguire, J. (2004). When can marine reserves improve fisheries management? Ocean and Coastal Management 47: 197–205.CrossRefGoogle Scholar
  26. Huntington, H. (2000). Using traditional ecological knowledge in science: Methods and applications. Ecological Applications 10: 1270–1274.CrossRefGoogle Scholar
  27. Hutchings, J. a., and Reynolds, J. D. (2004). Marine fish population collapses: Consequences for recovery and extinction risk. Bioscience 54: 297.[0297:MFPCCF]2.0.CO;2.Google Scholar
  28. Jacquet, J., Fox, H., Motta, H., Ngusaru, A., and Zeller, D. (2010). Few data but many fish: Marine small-scale fisheries catches for Mozambique and Tanzania. African Journal of Marine Science 32: 197–206. Scholar
  29. Kuo, T.-C., Laksanawimol, P., Aylesworth, L., Foster, S. J., and Vincent, A. C. J. (2018). Changes in the trade of bycatch species corresponding to CITES regulations: The case of dried seahorse trade in Thailand. Biodiversity and Conservation 27: 3447–3468. Scholar
  30. Lawson, J. M., Foster, S. J., Lim, A. C. O., Chong, V. C., and Vincent, A. C. J. (2014). Novel life-history data for threatened seahorses provide insight into fishery effects. Journal of Fish Biology 86: 1–15. Scholar
  31. Lawson, J. M., Foster, S. J., and Vincent, A. C. J. (2017). Low bycatch rates add up to big numbers for a genus of small fishes. Fisheries 42: 19–33. Scholar
  32. Lin, A. X., Chan, G., Hu, Y., Ouyang, D., Ung, C. O. L., Shi, L., and Hu, H. (2018). Internationalization of traditional Chinese medicine: Current international market, internationalization challenges and prospective suggestions. Chinese Medicine 13: 9. Scholar
  33. Mackinson, S., (2001). Integrating local and scientific knowledge: An example in fisheries science. Environmental Management.Google Scholar
  34. McClanahan, T., Castilla, J., White, A., and Defeo, O. (2009). Healing small-scale fisheries by facilitating complex socio-ecological systems. Reviews in Fish Biology and Fisheries 19: 33–47.CrossRefGoogle Scholar
  35. Meeuwig, J. J., Hoang, D. H., Ky, T. S., Job, S. D., and Vincent, A. C. J. (2006). Quantifying non-target seahorse fisheries in Central Vietnam. Fisheries Research 81: 149–157. Scholar
  36. Menzies, C. (2006). Traditional ecological knowledge and natural resource management. University of Nebraska Press.Google Scholar
  37. Mills, D.J., Westlund, L., Graaf, G. de, Kura, Y., Willman, R., Kelleher, K. (2011). Under-reported and undervalued: Small-scale fisheries in the developing world. In: Small-scale fisheries management: Frameworks and approaches for the developing world. Pp. 1–15.
  38. Moreno-Baez, M., Orr, B. J., Cudney-Bueno, R., and Shaw, W. W. (2010). Using fishers’ local knowledge to aid management at regional scales: Spatial distribution of small-scale fisheries in the northern gulf of California. Bulletin of Marine Science 86: 339–353.Google Scholar
  39. Musick, J., Burgess, G., Cailliet, G., Camhi, M., and Fordham, S. (2000). Management of sharks and their relatives (Elasmobranchii). Fisheries 25: 9–13.CrossRefGoogle Scholar
  40. O’Donnell, K.P., Pajaro, M.G., Vincent, A.C.J. (2010). How does the accuracy of fisher knowledge affect seahorse conservation status? 1–8.
  41. O’Donnell, K. P., Molloy, P. P., and Vincent, A. C. J. (2012). Comparing fisher interviews, logbooks, and catch landings estimates of extraction rates in a small-scale fishery. Coastal Management 40: 594–611. Scholar
  42. Pajaro, M., Vincent, A., Buhat, D., Perante, N. (1997). The role of seahorse fishers in conservation and management, In: Proceedings of the 1st international symposium in marine conservation. p 118–126.Google Scholar
  43. Pauly, D., Christensen, V., Guénette, S., Pitcher, T. J., Sumaila, U. R., Walters, C. J., Watson, R., and Zeller, D. (2002). Towards sustainability in world fisheries. Nature 418: 689–695. Scholar
  44. Pauly, D., Alder, J., Bennett, E., Christensen, V., Tyedmers, P., and Watson, R. (2003). The future for fisheries. Science 302: 1359–1361. Scholar
  45. Pauly, D., Watson, R., and Alder, J. (2005). Global trends in world fisheries: Impacts on marine ecosystems and food security. Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences 360: 5–12.CrossRefGoogle Scholar
  46. Perry, A. L., Lunn, K. E., and Vincent, A. C. J. (2010). Fisheries, large-scale trade, and conservation of seahorses in Malaysia and Thailand. Aquatic Conservation: Marine and Freshwater Ecosystems 20: 464–475. Scholar
  47. Pomeroy, R., and Berkes, F. (1997). Two to tango: The role of government in fisheries co-management. Marine Policy 21: 465–480.CrossRefGoogle Scholar
  48. Pomeroy, R., Parks, J., Pollnac, R., Campson, T., Genio, E., Marlessy, C., Holle, E., Pido, M., Nissapa, A., Boromthanarat, S., and Thu Hue, N. (2007). Fish wars: Conflict and collaboration in fisheries management in Southeast Asia. Marine Policy 31: 645–656. Scholar
  49. Pomeroy, R., Thi Nguyen, K. A., and Thong, H. X. (2009). Small-scale marine fisheries policy in Vietnam. Marine Policy 33: 419–428. Scholar
  50. Richards, L., and Maguire, J. (1998). Recent international agreements and the precautionary approach: New directions for fisheries management science. Canadian Journal of Fisheries and Aquatic Sciences 55: 1545–1552.CrossRefGoogle Scholar
  51. Salas, S., Chuenpagdee, R., Seijo, J. C., and Charles, A. (2007). Challenges in the assessment and management of small-scale fisheries in Latin America and the Caribbean. Fisheries Research 87: 5–16. Scholar
  52. Salin, K. R., and Yohannan, T. M. (2005). Fisheries and trade of seahorses, Hippocampus spp., in southern India. Fisheries Management and Ecology 12: 269–273.CrossRefGoogle Scholar
  53. Silvano, R., and Valbo-Jørgensen, J. (2008). Beyond fishermen’s tales: Contributions of fishers’ local ecological knowledge to fish ecology and fisheries management. Environment, Development and Sustainability 10: 657–675.CrossRefGoogle Scholar
  54. Still, J. (2003). Use of animal products in traditional Chinese medicine: Environmental impact and health hazards. Complementary Therapies in Medicine 11: 118–122.CrossRefGoogle Scholar
  55. Stocks, A. P. A. P., Foster, S. J. S. J., Bat, N. K. N. K., and Vincent, A. C. J. A. C. J. (2017). Catch as catch can: Targeted and indiscriminate small-scale fishing of seahorses in Vietnam. Fisheries Research 196: 27–33. Scholar
  56. Tesfamichael, D., Pitcher, T., and Pauly, D. (2014). Assessing changes in fisheries using fishers’ knowledge to generate long time series of catch rates: A case study from the Red Sea. Ecology and Society 19: 18.CrossRefGoogle Scholar
  57. Ut, V.N., Tam, T.C. (2012). Species composition and fishing status of seahorses (Hippocampus spp.) in Phu Quoc Island, Vietnam. In: Proceedings of international conference on Bien dong. p 1–7.Google Scholar
  58. Van Long, N., and Hoang, D. H. (1998). Biological parameters of two exploited seahorse species in a Vietnamese fishery. Mar. Biol. South China Sea 3: 449.Google Scholar
  59. Vincent, A. C. J., Meeuwig, J. J., Pajaro, M. G., and Perante, N. C. (2007). Characterizing a small-scale, data-poor, artisanal fishery: Seahorses in the Central Philippines. Fisheries Research 86: 207–215. Scholar
  60. Vincent, A. C. J., Foster, S. J., and Koldewey, H. J. (2011). Conservation and management of seahorses and other Syngnathidae. Journal of Fish Biology 78: 1681–1724. Scholar
  61. Vincent, A. C. J., Sadovy de Mitcheson, Y. J., Fowler, S. L., and Lieberman, S. (2013). The role of CITES in the conservation of marine fishes subject to international trade. Fish and Fisheries 15: 563–592. Scholar
  62. Zeller, D., Booth, S., and Pauly, D. (2006). Fisheries contributions to the gross domestic product: Underestimating small-scale fisheries in the Pacific. Marine Resource Economics 21: 355–374.CrossRefGoogle Scholar
  63. Zeller, D., Booth, S., Davis, G., and Pauly, D. (2007). Re-estimation of small-scale fishery catches for US flag-associated island areas in the western Pacific: The last 50 years. Fishery Bulletin 105: 266–277.Google Scholar

Electronic References

  1. IMF (2015). IMF eLibrary Data. <>. Downloaded on 25 August 2015.
  2. UNEP-WCMC (2014). Checklist of CITES species. CITES Secretariat, Geneva, Switzerland and UNEP-WCMC, Cambridge, United Kingdom. Accessed on 15 August 2015.Google Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • A. P. Stocks
    • 1
    Email author
  • S. J. Foster
    • 1
  • N. K. Bat
    • 2
  • N. M. Ha
    • 3
  • A. C. J. Vincent
    • 1
  1. 1.Project Seahorse, Institute for the Oceans and FisheriesThe University of British ColumbiaVancouverCanada
  2. 2.Research Institute for Marine FisheriesHaiphongVietnam
  3. 3.Centre for Natural Resources and Environmental StudiesViet Nam National UniversityHanoiVietnam

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