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Early life history of oxudercine goby Pseudapocryptes elongatus in the Mekong Delta, Vietnam

Published online by Cambridge University Press:  12 December 2016

Kazuki Yokouchi*
Affiliation:
Center for International Collaborative Research, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 851-2213, Japan National Research Institute of Fisheries Science, Japan Fisheries Research and Education Agency, 6-31-1 Nagai, Yokosuka 238-0316, Japan
Hieu Van Mai
Affiliation:
College of Aquaculture and Fisheries, Can Tho University, 3/2 Street, Can Tho, Vietnam Graduate School of Fisheries and Environmental Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan Institute for East China Sea Research, Nagasaki University, 1551-7 Taira-machi, Nagasaki 851-2213, Japan
Toan Thanh Vo
Affiliation:
College of Aquaculture and Fisheries, Can Tho University, 3/2 Street, Can Tho, Vietnam
Ryoshiro Wakiya
Affiliation:
Graduate School of Bioresource and Environmental Sciences, Kyushu University, 6-10-1 Hakozaki, Higashi Ward, Fukuoka 812-8725, Japan
Tatsuya Kawakami
Affiliation:
Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo Ward, Tokyo 113-8657, Japan
Chikaya Tanaka
Affiliation:
School of Marine Biosciences, Department of Marine Biosciences, Kitasato University, 1-15-1 Kitasato, Minami Ward, Sagamihara 252-0373, Japan
Tatsuki Yoshinaga
Affiliation:
School of Marine Biosciences, Department of Marine Biosciences, Kitasato University, 1-15-1 Kitasato, Minami Ward, Sagamihara 252-0373, Japan
Minoru Wada
Affiliation:
Graduate School of Fisheries and Environmental Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
Dinh Dac Tran
Affiliation:
College of Aquaculture and Fisheries, Can Tho University, 3/2 Street, Can Tho, Vietnam
Hung Phuoc Ha
Affiliation:
College of Aquaculture and Fisheries, Can Tho University, 3/2 Street, Can Tho, Vietnam
Atsushi Ishimatsu
Affiliation:
Institute for East China Sea Research, Nagasaki University, 1551-7 Taira-machi, Nagasaki 851-2213, Japan
*
Correspondence should be addressed to: K. Yokouchi, Center for International Collaborative Research, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 851-2213, Japan Email: kazukiy30@gmail.com

Abstract

Pseudapocryptes elongatus is one of the oxudercine gobies, which show varying degrees of amphibious behaviour and capacities to breathe air. There is little information on the early life history of P. elongatus, particularly of their morphology and larval habitat and duration. This study focused on the life history of larval and juvenile stages of P. elongatus investigated by genetic species identification, morphological observation and otolith analyses using specimens collected in June and October 2012 from estuaries in Bac Liêu Province, southern Vietnam (09°14′N 105°43′E). Genetically identified juvenile P. elongatus were characterized by (1) a slender body form, (2) the anterior edges of both the anal and second dorsal fins located at the midpoint along the body axis, (3) scarce chromatophores over the body surface, (4) melanophores in the parietal region between the eyes, and (5) a single row of melanophores along the base of the anal fin. Mean age at recruitment to estuaries was 38.0 ± 4.1 days, and otolith Sr/Ca ratios ranged from 8.9 to 9.9 mmol mol−1, suggesting that larval migration from their spawning sites requires more than 1 month in saline environments.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2016 

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Footnotes

*

Present Address: National Research Institute of Fisheries Science, Yokosuka, 238-0316, Japan (kazuki.yokouchi@affrc.go.jp).

Deceased.

References

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