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The Age and Spawning Characteristics of the Korean Endemic Spine Loach, Iksookimia pacifica (Pisces: Cobitidae) in the Bukcheon (stream), Korea  

Ko, Myeong-Hun (Division of EcoScience, Ewha Womans University)
Won, Yong-Jin (Division of EcoScience, Ewha Womans University)
Publication Information
Korean Journal of Ichthyology / v.28, no.2, 2016 , pp. 72-78 More about this Journal
Abstract
The age and spawning characteristics of Iksookimia pacifica were investigated in this study to provide baseline data for its ecological characteristics in the Bukcheon (stream), Goseong-gun, Gangwon-do, Korea from January to December, 2013. Age groups of I. pacifica (female) estimated by the frequency distribution of total length in the spawning season indicated that the 30~49 mm group is 1 year old, the 50~74 mm group is 2 years old, the 75~99 mm group is 3 years old, the 100~124 mm group is 4 years old, and the 130~160 mm group is $5{\leq}$years old. The sex ratio (♂/♀) was 0.63, and females were 30~60 mm larger than males. The lamina circularis at the base of pectoral fins in males as a secondary sexual character was created at the 13th month after hatching. The spawning season according to the gonadosomatic index (GSI) was July to August (main spawning season in July) with water temperatures of $20{\sim}25^{\circ}C$. The average number of eggs was $2,503{\pm}1,337$ with a diameter of $1.11{\pm}0.04mm$ in mature eggs.
Keywords
Spine loach; Iksookimia pacifica; age groups; spawning characteristics;
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