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Egg Development and Early Life History of the Korean Spine Loach, Cobitis tetralineata (Pisces:Cobitidae)  

Ko, Myeong-Hun (Division of EcoScience and Department of Life Science, Ewha Womans University)
Won, Yong-Jin (Division of EcoScience and Department of Life Science, Ewha Womans University)
Publication Information
Korean Journal of Ichthyology / v.27, no.2, 2015 , pp. 95-103 More about this Journal
Abstract
Egg development and early life history of the Korean spine loach, Cobitis tetralineata, were investigated in the present study. Adult fish were sampled using spoon nets at the Seomjin River in Jeongsan-ri, Bokheong-myeon, Sunchang-gun, Jeollanbuk-do, Korea, July 2013. Eggs were obtained after injecting Ovarprim into females. Eggs were then artificially fertilized using the Dry method in the laboratory. Mature eggs were slightly adhesive and transparent with grey coloring, and measured $1.04{\pm}0.03mm$ ($mean{\pm}SD$) in diameter. Hatching of the embryo occurred approximately 56 hours after fertilization at $25^{\circ}C$ of water temperature, and the average size of newly hatched larvae was about $4.6{\pm}0.11mm$ in total length. At fifth day after hatching, the larval full length reached $6.8{\pm}0.28mm$ on average and their yolk sac had been completely absorbed. At 17th day after hatching, larva entered the juvenile stage and reached $9.8{\pm}0.50mm$ in total length. At 100th day after hatching, the formation of Gambetta's zone of four line was complete and juveniles were similar in general appearance to adults, and they averaged $34.7{\pm}5.77mm$ in total length.
Keywords
Cobitis tetralineata; egg development; early life history;
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