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http://dx.doi.org/10.13047/KJEE.2020.34.3.216

Ecological Characteristics of Korean Aucha Perch, Coreoperca herzi in Jaho Stream, Korea  

Byeon, Hwa-Keun (Dept. of Biology Education, Seowon Univ.)
Publication Information
Korean Journal of Environment and Ecology / v.34, no.3, 2020 , pp. 216-223 More about this Journal
Abstract
This study investigated the ecological characteristics of Coreoperca herzi at Jaho stream from September 2018 to August 2019. This species inhabited riffle and midstream of the stream, where the riverbed structure was mostly covered with cobble and pebble. The depth of the habitat was 32-157 cm, and the velocity of stream fast at 0.64±0.28 (0.32-1.28) m/sec. The gender ratio of females to males was 1:0.95. The age according to the frequency analysis of total length indicated that the group with 42-80 mm in total length was one year old, the group with 80-130 mm was two years old, the group with130-200 mm was three years old, and the group over 200 mm was four years old. The total length of sexually mature fishes was 65 mm for females and 70 mm for males. The sexually mature individuals grown in nature had a smaller total length than those reared in a laboratory. The spawning season was from May to late July, and the water temperature was 18.4-26.4℃ during the period. The prosperous spawning season was from May to June, and the water temperature was 18.4-21.8℃ during the period. The average number of eggs in the ovaries was 462 (151-919) per mature female, and the matured eggs were yellowish and spherical with a mean diameter of 2.31±0.33 (1.93-3.10) mm. Calculation length-weight relation of Korean aucha perch showed the constant a as 0.00002 and b as 3.01, condition factor (K) as 1.76 (1.01-2.63) on average, and the slope was a positive value of 0.0005.
Keywords
SPAWING SEASON; SEX RATIO; NUMBER OF EGGS IN THE OVARY; LENGTH-WEIGH RELATION; CONDITION FACTOR (K);
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Times Cited By KSCI : 5  (Citation Analysis)
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