To analyze quantitative fluctuation in abundance and species composition in coastal waters of Dolsan, Yeosu, the fished were collected by gape net from March to November, 2000. The fish species caught by set net collected fishes were identified 63 species, 56 families, 42 orders, and the number of appearance and biomass was 2,230,297 individuals and 16,076.8kg. The most dominant orders were Perciformes, Clupeiformes and Tetraodontiformes which accounted for 71.4% of the total. The dominant species in number were Engraulis japonicus, Sardinops melanostictus, Trichiurus lepturus which accounted for 99.2% (2,211,642 individuals) of the total fishes collected. The dominant species in biomass were Engraulis japonicus which accounted for 79.7% (12,807g) of the total fishes collected. Temporal occurence of the dominant species such as the Engraulis japonicus, Sardinops melanostictus, Trichiurus japonicus, Ilisha elongata, Leiognathus nuchalis was closely correlated with water temperature, which is expressed as following regression equation, y=0.0864x-0.2311(r2＝0.3516). The species collected during the sampling yearly period were Engraulis japonicus, and migratory fish were Ilisha elongata, Trichiurus japonicus, Scomberomorus nipphnius, Scomber japonicus, Konosirus punctatus, Sphyraena pinguis, Pseudosciaena polyactis.

A species composition and population structure of fish, collected 16 times by bottom otter trawl in the coast of Geumo Island, from February 2002 to November 2005, was investigated. The fish species caught by bottom otter trawl from year 2002 to 2005 was entirely 72 species, 41 classes, and 12 orders, and the number of appearance and biomass was 5,999 individuals and 287,902.1g, respectively, being of the Perciformes(31 species and 19 classes; 43.1% in total number of species appeared) as a dominant species. 638 individuals of Leiognathus nuchalis which was 10.6% in total fish were appeared and 465 individuals of Konosirus punctatus(7.8%), 449 individuals of Engraulis japonicus(7.8%). biomass of Sebastes schlegeli was 33,258.7g as a dominant species(11.6% in total fish appeared) and 18,821.1g of Liparis agassizii(6.5%), 16,708.0g of Konosirus punctatus(5.8%). The diversity index of species per months of the collected by a small otter trawl in coastal water of Geumodo from year 2002 to 2005 was 2.860-3.639 and the evenness index was 0.825-0.887 in case of dominance index was 0.224-0.268 against the evenness index. The similarity of community structure per yearly was very high because of the relative difference(0.006), which was the least in 2004 and 2005.

이 연구는 2003년 4월부터 5월까지 전라남도 보성군 겸백면 율어리 소재의 보성강 중류에서 투망과 족대를 이용하여 채집된 모래무지 어미들을 전남대학교 해양기술학부 자원생물실험실로 운반하여 실내 사육하면서 난발생 및 자치어 형태발달을 관찰하였다. 모래무지의 수정란은 구형의 침성부착란으로 난경은 1.98±0.19 ㎜(n=50)였고, 반투명하였다. 부화에 소요되는 시간은 수정 후 164시간부터였고, 이 때 근절수가 31～32개였으며, 배체의 움직임이 활발하였으며, 머리부터 난막을 뚫고 부화하기 시작하였다. 부화 직후의 자어는 전장이 4.61±0.83 ㎜(n=10)로 난황은 아직 흡수하지 않은 상태였으며, 입과 항문은 열려 있지 않았다. 등쪽과 배쪽, 꼬리쪽에 별모양과 점모양의 흑색소포가 산재하였으며, 눈에는 색소포가 진하게 착색되어 있었다. 부화 후 42일째는 전장 16.22±0.65 ㎜(n=10)로 흑색소포가 두부와 등쪽과 체측면에 따라 짙게 산재하였고, 주둥이 양쪽에 수염이 나타났으며, 체형이나 반문이 성어와 완전히 닮아 있어 치어기로 이행하였다.