한국환경생태학회지 (Korean Journal of Environment and Ecology)

  • 제25권3호
  • /
  • Pages.318-326
  • /
  • 2011
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  • 1229-3857(pISSN)
  • /
  • 2288-131X(eISSN)
한국환경생태학회 (Korean Society of Environment and Ecology)
권호 표지

섬진강 중.상류 수계에서 붕어 개체군의 생태학적 특성치 추정

Estimation on Population Ecological Characteristics of Crucian Carp, Carassius auratus in the Mid-Upper System of the Seomjin River

  • 장성현 (대구대학교 생물교육과) ;
  • 류희성 (대구대학교 생물교육과) ;
  • 이정호 (대구대학교 생물교육과)
  • 투고 : 2010.10.20
  • 심사 : 2011.06.25
  • 발행 : 2011.06.30
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초록

섬진강 중 상류 수계에서 붕어의 자원량 및 자원관리의 기초로 사용되는 붕어의 개체군 생태학적 특성치를 추정하고자 하였다. 채집된 붕어의 전장은 95-288mm의 범위를 보였으며, 연령은 비늘의 윤문을 통해 결정하였다. 연령형질로서 비늘은 윤문이 뚜렷하게 구분되었으며, 이를 통해 확인된 최고 연령어는 5세로 나타났다. 전체 표본에서 2세 연령어가 가장 많은 양을 차지하였으며(n=38), 다음으로는 3세 연령어가 풍부하였다(n=22). 연변수지수 분석을 통해 매년 단일 윤문이 형성됨이 확인되었다. 체장과 체중 간의 관계식은 BW = $0.0038BL^{3.73}$($R^2$=0.96) (p<0.01)로 추정되었고, 인경과 체장 간의 관계식은 BL = 2.362R+2.76($R^2$=0.89)로 나타났다. 비선형 회귀분석을 통해 추정된 von Bertalanffy 성장 파라미터들은 이론적 최대체장 33.2cm이었으며, 이론적 최대체중 1,798.4g, 성장계수 0.20년$^{-1}$, 체장이 0일 때의 연령 -0.51년 등으로 추정되었다. von Bertalanffy에 의한 붕어의 성장식은 $L_t$ = 33.23($1-e-^{0.20(t+0.51)}$)($R^2$=0.98)로 확인되었다. 연간 생존율은 0.427년$^{-1}$로, 순간자연사망계수는 0.784년$^{-1}$로 추정되었으며, 순간어획사망계수는 0.067년$^{-1}$로 산출되었다. 생존율로부터 추정된 순간전사망계수는 0.851년$^{-1}$로 추정되었다.

The population ecological characteristics of the Crucian carp, Carassius auratus, were determined in order to estimate stock of the mid-upper system of the Seomjin River. The fish ranged in size from 95 to 288mm total length. The age was determined by counting the scale annulus. The scales displayed clear annulus that were used to estimate the age. The oldest fish observed in this study was 5 years old. Age-2 fishes were the most numerous in the sample(n=38), followed in frequency be age-3(n=22). Marginal index analysis validated the formation of a single annulus per year. The relationship between body length and body weight was BW = $0.0038BL^{3.73}$($R^2$=0.96) (p<0.01). The relationship between the scale radius and body length was BL = 2.362R+2.76($R^2$=0.89). The von Bertalanffy growth parameters estimated from a non-linear regression method were $L_{\infty}$=33.2 cm, $W_{\infty}$=1,798.4 g, $K=0.20year^{-1}$ and $t_0$=-0.51year. Therefore, Growth in length of the fish was expressed by the von Bertalanffy's growth equation as $L_t=33.23$($1-e^{-0.20(t+0.51)}$)($R^2$=0.98). The annual survival rate was estimated to be 0.427year$^{-1}$. The instantaneous coefficient of natural mortality of estimated from the Zhang and Megrey method was $0.784year^{-1}$, and instantaneous coefficient of fishing mortality was calculated $0.067year^{-1}$. From the estimates of survival rate, the instantaneous coefficient of total mortality was estimated to be $0.851year^{-1}$.

키워드

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