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http://dx.doi.org/10.13047/KJEE.2019.33.6.677

Ecological Characteristics of Rhynchocypris kumgangensis (Cyprinidae) at the Spring Water in Eocheon Stream, Korea  

Byeon, Hwa-Keun (Dept. of Biology Education, Seowon Univ.)
Publication Information
Korean Journal of Environment and Ecology / v.33, no.6, 2019 , pp. 677-685 More about this Journal
Abstract
We investigated the ecological characteristics of kumgang fat minnow (Rhynchocypris kumgangensis) in the Eocheon stream from October 2017 to September 2018. The water temperature was 10.2- 14.3℃ and remained below 15℃ during the year. The fishes in cohabitation with kumgang fat minnow were Cottus koreanus (16.62%), Phoxinus phoxinus (10.74%), Rhynchocypris oxycephalus (1.55%), Oncorhynchus mykiss (0.56%), Zacco koreanus (0.28%), and Iksookimia koreensis (0.14%%). The ratio of females to males was 1:0.91 and did not vary widely. The frequency analysis of total length indicated that the fishes with less than 40 mm in total length were one year old, those with 40 - 69 mm were two years old, those with 70 - 84 mm were three years old, and those with 85 mm or more were four years old for individuals collected in May through June. The sexually mature fishes were over two years old. The spawning season was from late May to late August, and the water temperature was 12.5~14.5℃ during the period. The prosperous spawning season was from June to July, and the water temperature was 13.6 - 14.5℃ during the spawning period. The average number of eggs in the ovaries was 1,006 (664 - 1,666) per matured female, and the matured eggs were yellowish and spherical with a mean diameter of 1.34±0.17 mm. The length-weight correlation of R. kumgangensis was BW = 0.00003TL2.77 with the constant a as 0.00003, b as 2.77, the average condition factor (K) as 1.04(0.65~1.48), and the slope as -0.0012. The kumgang fat minnows inhabiting in the spring water had a longer spawning period, a fewer number of eggs in ovaries, and the lower condition factor (K) than those inhabiting other areas.
Keywords
WATER TEMPERATURE; SPAWING SEASON; SEX RATIO; NUMBER OF EGGS IN THE OVARY; LENGTH-WEIGHT RELATION; CONDITION FACTOR (K);
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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