Abstract
Fish fauna of 13 sites in a main channel and its tributaries of the Taehwa River and 9 Sites of other headwater streams in the Ulsan area (Mt. Gaji) were investigated from February 1999 to October 2000. All sites were the 1st to 5th order streams in the Ulsan area, and 10 sites (45.5%) were intermittent streams. A total of 2,695 flsh specimens were collected and classified into 14 families and 44 species. Cyprinidae accounted for 40.9% (18 species) of the total fish species collected and 68.4% (1,845 ind.) of the total abundance. Subdominant families were Cobitidae (6 species; 78 ind.), Gobiidae (5 species; 240 ind.), and Gasterosteidae (2 species: 128 ind.). Zacco temmincki (RA 23.0%, 14 sites) was the dominant species; subdominant species were Moroco oxycephalus (20.2%, 11 sites), Zacco platypus (8.0%, 10 sites), Mugil cephalus (5.2%, 3 sites). Among the total species, 8 species were endemic species to Korea. The dominant Korean endemic species was Squalidus chankaensis tsuchigae (53.6% of Korean endemic species) and subdominant species were Iksookimia longicorpa (20.5%), and S. japonicus coreanus (6.6%) . Due to the intermittent nature of streams in the Ulsan area, a conservation program of nsh fauna is strongly needed.
가지산에서 발원하는 태화강의 본류 및 지천을 중심으로 1${\sim}$5차 하천인 22개 지점 (간헐천 45%;낙동강 수계 5개 지점,형산강 수계 4개 지점,태화강 수계 13개지점)에서 1999년 2월부터 2000년 30월까지 4${\sim}$8회 어류상을 조사한 결과 총 14과 44종 2,696개체가 채집되었다. Cyprinidae (18종, 1,845개체: 상대풍부도(RA),40.9%)가 우점과로 나타났고, Zacco temmincki (RA23.0%, 14개 지점)는 우점종으로 나타났으며, 아우점종은 Moroco oxycephalus (20.2%, 11개 지점), Zacco platypus (8.0%, 10개 지점), Mugil cephalus (5.2%, 3개 지점)순으로 나타났다. 채집된 종 중 한국고유종은 모두 8종으로 나타났다(5과, 166개체, 6.2%).한국고유종중 우점종은 Squalidus chankaensis tsuchigae (한국고유종 중53.6%)며, 아우점종은 Iksookimia longicorpa (20.5%)와 S. japonicus coreanus (6.6%)로 나타났다. 본 조사에서 외래도입종은 모두 3종, Micropterus salmoides (36 개체), Lepomis macrochirus (5개 체), Cyprinus carpio (in-troduced from Israel, 1개체)이 채집되었다. 형산강과 태화강 수계의 상류하천에서는 S. multimaculatus, Coreoperca herzi, Pungitus kaibarae가 채집되어 낙동강 수계와는 차이를 보였다.
