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Toward the Sustainability of Oyster Aquaculture in Kinmen Island, Taiwan

Toward the Sustainability of Oyster Aquaculture in Kinmen Island, Taiwan. 黃守忠、謝蕙蓮、陳章波 Shou-Chung Huang a , Hwey-Lian Hsieh a , Chang-Po Chen a,b a Research Center for Biodiversity, Academia Sinica, Taipei, Taiwan b Institute of Fisheries Sciences, National Taiwan University, Taipei, Taiwan.

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Toward the Sustainability of Oyster Aquaculture in Kinmen Island, Taiwan

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  1. Toward the Sustainability of Oyster Aquaculture in Kinmen Island, Taiwan 黃守忠、謝蕙蓮、陳章波 Shou-Chung Huanga, Hwey-Lian Hsieha, Chang-Po Chena,b a Research Center for Biodiversity, Academia Sinica, Taipei, Taiwan b Institute of Fisheries Sciences, National Taiwan University, Taipei, Taiwan

  2. Outlines • Oyster cultures in Kinmen: “Rock oysters” vs. “Hanging oysters” • A research project in 2003 -Background -methods -results -conclusions • Suggestions for sustainable oyster aquaculture in Kinmen

  3. “Rock oysters”

  4. “Hanging oysters”

  5. Rock oysters Hanging oysters

  6. Background • Production declines in the past two decades. • 1982: 1255 tons • 1992: 521 tons • 2002: 227 tons • Fishermen reported mass mortality in summer and fall in recent years.

  7. Questions • Did mass mortality really occur? • What factors affect oyster’s growth & mortality? Food seston, phytoplankton Parasites flat warms, oyster drills Water T, S, DO Oysters Sediment silt, organic % Disease

  8. Study sites 北山 湖下 水頭

  9. Temperature Salinity DO Seston (~= SS) Chlorophyll a Particulate organic carbon Particulate organic nitrogen Shell length Mortality ratio Condition index (CI) Respiration rate Excretion rate Approaches Environmental parameters Oyster parameters Study period: late July to early December 2003 Sampling frequency: every 2 to 4 weeks

  10. Winter Monsoon started

  11. Monthly mortality rate

  12. Monthly growth rate

  13. Conclusions • Winter monsoon started in late September and resulted in poor growing environments for oysters in Kinmen. • Mass mortality did not occur, but conditions of hanging oysters began to deteriorate in October, right after winter Monsoon started. • Rock oysters performed better than hanging oysters with lower mortality and higher growth rates during winter Monsoon season. • The poor adaptation of hanging oysters was resulted ,we hypothesized, from importing their spats from southwest coasts of Taiwan.

  14. Suggestions • Active management • Adjusting rearing and harvest time • Rotation of culture locations

  15. Suggestions • Active management • Adjusting rearing and harvest time • Rotation of culture locations • Environmental monitoring • Pollution watch on Jiulong river

  16. Jiulong River Xiamen Kinmen

  17. Suggestions • Active management • Adjusting rearing and harvest time • Rotation of culture locations • Environmental monitoring • Pollution watch on Jiulong river • Improve marketing, esp. the rock oysters • Open oyster farms for tours • Need more studies!!!

  18. Thank you & a major help from our research assistant Ms. Yeh Hsin-Yi

  19. October 22, 2003

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