괴산호 어류상 및 군집구조 Ichthyofauna and Structure of the Fish Community in Lake Goesan, Korea
pp.552-563
괴산호에 서식하는 어류상 및 군집구조를 알아보기 위하여, 2010년 4월부터 2012년 10월까지 조사하였다. 본 조사에서 확인된 종은 모두 11과 36종이었으며, 개체수의 우점종은 Hemibarbus labeo (29.9%)와 Zacco platypus (20.0%)이었고, 생체량의 우점종은 H. labeo (37.2%)와 Carassius auratus (17.9%) 순이었다. 한국고유종은 14종(38.9%), 법적보호종인 Acheilognathus signifer 1종, 방류된 강하성 어류인 Anguilla japonica, 회유종이지만 육봉화된 Hypomesus nipponensis, Plecoglossus altivelis 2종이 분포하였고, 외래도입종인 Cyprinus carpio (Israeli type), C. cuvieri, Micropterus salmoides 3종이 출현하였다. 괴산호의 주요 분포종인 C. auratus, M. salmoides 개체군의 전장-체중 관계식에 의한 매개변수 b값은 3.13∼2.99, 3.11∼2.99로 해마다 감소하였으나, H. labeo, Z. platypus 개체군은 2.98∼3.07, 3.06∼3.23으로 증가하는 경향을 보였다. C. auratus, M. salmoides 개체군의 비만도 지수 기울기도 해마다 감소한 반면, H. labeo와 Z. platypus 개체군은 증가하는 경향을 보였다.
The characteristics of ichthyofauna and fish community in Lake Goesan were examined from April 2010 to October 2012. During the survey period thirty six species belonging to 11 families were collected. Dominant species by number were Hemibarbus labeo (29.9%) and Zacco platypus (20.0%). In biomass, the dominant species were H. labeo (37.2%) and Carassius auratus (17.9%). Also, fourteen Korean endemic fish species (38.9%) and one endangered species (Acheilognathus signifer) were collected. Further, one catadromous species was observed for stock enhancement (Anguilla japonica), in addition to two land-locked anadromous species (Hypomesus nipponensis, Plecoglossus altivelis) and three exotic species (Cyprinus carpio (Israeli type), C. cuvieri, Micropterus salmoides). According to the length-weight relation of C. auratus and M. salmoides, the b values were 3.13∼2.99, 3.11∼2.99, showing a declining tendency annually. However, for H. labeo and Z. platypus, the b values were 2.98∼3.07, 3.06∼3.23 respectively, showing an increasing trend. The slope values for C. auratus and M. salmoides population conditions were controlled by K factor showing a tendency to decrease, but H. labeo and Z. platypus were showing a tendency to gradually increase.