논문 상세보기
Habitat environment and food sources of fish, benthic macroinvertebrates, and brown trout (Salmo trutta) downstream of Soyang River Dam were analyzed. Water temperature at the site where brown trout was identified ranged from approximately 12.4 to 13.4°C, confirming that this environment could provide an optimal water temperature for the growth of brown trout. Most of the riverbed structures at this site had a high proportion of cobble and pebble substrates. Brown trout constituted less than 5% of the total fish population, more abundant in the upstream. The total lengthweight relationship of brown trout showed a parameter b value of 3.234, with the condition factor (K) increasing with length. Dominant benthic macroinvertebrates were Limnodrilus gotoi and Chironomidae spp. (non-red type). Stomach content analysis indicated that brown trout primarily consumed aquatic insects (R.A., 73.8%), non-insects (R.A., 23.3%), ground insects (R.A., 2.7%), and fish (R.A., 0.2%, TL: 246 mm). Correlation analysis revealed a positive relationship between total length and species preferring flowing water (p<0.05) and a negative relationship of total length with species favoring low-flow, sandy habitats (p<0.05). Larger brown trout showed active feeding behavior and resilience to flow speed and riverbed structure. The primary food source for the largest brown trout (TL: 246 mm) was Hypomesus nipponensis. Future analyses should include brown trout with a total length of 30 cm or more. Given that samples were limited, comprehensive population management will require ongoing research.
2. 재료 및 방법
2.1. 조사지점 및 시기
2.2. 조사방법 및 분석
2.3. 브라운송어의 전장-체중 관계, 비만도
2.4. 서식기능군 분석 및 통계 분석
3. 결과 및 고찰
3.1. 서식환경
3.2. 어류 종 조성 및 냉수성 어종의 분포 현황
3.3. 브라운송어의 전장 분포, 전장-체중 관계
3.4. 소양강댐 하류 일대의 저서성 대형무척추동물상
3.5. 브라운송어 위 내용물에서 확인된 먹이원 분석
3.6. 먹이원의 서식기능군 (HOGs: Habitat orientationgroups) 분석
3.7. 브라운송어 전장에 따른 먹이원의 섭식 패턴
적 요
CRediT authorship contribution statement
Declaration of Competing Interest
사 사
REFERENCES
