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Embryonic Development and Early Life History of the Endangered Species Microphysogobio koreensis (Pisces: Cyprinidae)  

Kim, Chi-Hong (Central Inland Fisheries Research Institute)
Yoon, Seung-Woon (Department of Biological Science and Institute for Biodiversity Research, College of Natural Sci-ences, Chonbuk National University)
Kim, Jae-Goo (Department of Biological Science and Institute for Biodiversity Research, College of Natural Sci-ences, Chonbuk National University)
Kim, Hyun-Tae (Department of Biological Science and Institute for Biodiversity Research, College of Natural Sci-ences, Chonbuk National University)
Park, Jong-Sung (Department of Biological Science and Institute for Biodiversity Research, College of Natural Sci-ences, Chonbuk National University)
Park, Jong-Young (Department of Biological Science and Institute for Biodiversity Research, College of Natural Sci-ences, Chonbuk National University)
Publication Information
Korean Journal of Ichthyology / v.24, no.3, 2012 , pp. 160-166 More about this Journal
Abstract
Egg development and early life history of the endangered Korean freshwater fish, Microphysogobio koreensis, was investigated to get a basic information for establishing its conservation strategy. The matured adult fishes were sampled at Imsil-gun, Jeollabuk-do, Korea in May 1 2012 and artificially fertilized. The fertilized eggs were spherical, separated demersal and $1.8{\pm}0.14mm$ in diameter. The hatching of the embryo began at about 29 hours after fertilization under water temperature of $23^{\circ}C$. The newly hatched pre-larvae were average $2.2{\pm}0.48mm$ in total length. At 4 days after hatching, the post-larvae were $3.6{\pm}0.55mm$ in total length and york sac was completely absorbed. At 20 days after hatching, their fin rays were formed and finally the larvae entered juvenile stage and grew up to $6.5{\pm}0.77mm$ in total length. At 60 days after hatching, the total length reached $24.4{\pm}1.71mm$, and the band patterns of he head and lateral side were similar to adult fish. Based on this study, the fertilized eggs of M. koreensis hatched more quickly and the pre-larvae length was also smaller, compared with related species.
Keywords
Endangered fish; Microphysogobio koreensis; egg development; early life history;
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Times Cited By KSCI : 4  (Citation Analysis)
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