Ecological study of the mudskippers in the Mekong Delta, Vietnam

2014 Fiscal Year Final Research Report

• Project/Area Number: 23405033
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 海外学術
• Research Field: Aquatic bioproduction science
• Research Institution: Nagasaki University
• Principal Investigator: ISHIMATSU Atsushi 長崎大学, 水産・環境科学総合研究科(環シナ), 教授 (00184565)
• Co-Investigator(Kenkyū-buntansha): WADA Minoru 長崎大学, 水産・環境科学総合研究科(水産), 教授 (70292860) ; IWATAKI Mitsunori 東京大学, アジア生物資源環境研究センター, 准教授 (50423645)
• Co-Investigator(Renkei-kenkyūsha): TAKITA Toru 長崎大学, 水産学部, 名誉教授 (30039721)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: 国際研究者交流 / ベトナム / メコンデルタ / 生態 / Mudskipper / 養殖 / 微生物 / 植物プランクトン

Outline of Final Research Achievements

We conducted the following studies in the Mekong Delta, in collaboration with Can Tho University. The first year survey revealed that the natural resource of the mudskipper, Pseudapocryptes elongatus, is at a risk for a drastic decrease due to overfishing of its larvae as aquaculture seeds. We demonstrated that spawning occurs in the saline environment, and that the juveniles we collected in the Bac Lieu Province were 38 days old after hatching. (2) We found one or two orders of magnitude higher numbers of algae and bacteria in the mudskipper aquaculture pond water than in the shrimp aquaculture ponds. Oxygen concentration in the subsurface water of mudskipper ponds was nearly zero during nighttime. (3) A new marine dinoflagellate collected from Vietnamese coast was described on the basis of morphology, and molecular phylogeny inferred on small and large subunit ribosomal DNA sequences.

Free Research Field

環境生理学