Korean Journal of Environment and Ecology (한국환경생태학회지)

Korean Society of Environment and Ecology (한국환경생태학회)
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Ecological Characteristics of Korean Slender Gudgeon, Squalidus gracilis Majimae in Sinan Stream, Korea

신안천에 서식하는 긴몰개(Squalidus gracilis Majimae)의 생태 특성

  • Received : 2021.04.16
  • Accepted : 2021.05.09
  • Published : 2021.06.30
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Abstract

This study surveyed the ecological characteristics of Squalidus gracilis majimae at Nakdong River tributary Sinan Stream from January to December 2020. The species inhabited the riverbed that was mostly covered with gravel and sand. The water depth was 27-158 cm, and the average was rather deep at 54 cm. The stream velocity was slow at 0.41±0.19 (0.24-0.86) m/sec. The gender ratio of females to males was 1:0.73. According to the total length-frequency distribution, the age indicated that the group with less than 50 mm in total length was one year old, the group with 70-69 mm was two years old, and the group over 70 mm was three years old. The total length of sexually mature fishes was 50 mm for females and 60 mm for males. The spawning season was from June to July, and the water temperature was 20.9-23.4℃ during the period. The prosperous spawning season was July. The average number of eggs in the ovaries was 1,009 (595-1,630) per matured female, and the matured eggs were yellowish and spherical with a mean diameter of 0.78±0.08 (0.57-0.83) mm. The live foods were S. gracilis majimae Protozoa, attached algae, zooplankton, and aquatic insects. The feeding habits of S. gracilis majimae are omnivorous, but more than 80% of the stomach content was aquatic insects, Chironomidae spp. The larger the size of this species, the greater the amount and frequency of eating aquatic insects, which are animal feeds. The population that ate aquatic insects did not eat vegetable food.

긴몰개(Squalidus gracilis majimae)의 생태적 특징을 연구하기 위해 2020년 1월부터 12월까지 낙동강 지류 신안천에서 조사를 실시하였다. 본 종의 서식지 하상구조는 자갈(gravel)과 모래(sand)가 풍부하였으며, 수심은 27~158cm이었고 평균 54cm로 다소 깊었으며, 유속이 0.41±0.19(0.24~0.86)m/sec로 느렸다. 암수 성비는 1 : 0.73이었다. 전장빈도분포도에 따른 연령은 봄(5-6월)기준으로 전장 50mm 미만은 만1년생, 50~69mm은 만 2년생, 70mm 이상은 만 3년생으로 추정되었다. 생식가능 전장의 크기는 암컷이 50mm, 수컷은 60mm 이상이었다. 산란시기는 6월에서 7월(산란성기 6월)이었으며 수온은 20.9~23.4℃ 이었다. 포란수는 평균 1,009(595~1,630)개 이었고 성숙란은 짙은 노란색 구형으로 직경이 0.78±0.08(0.57~0.83)mm이었다. 먹이생은 원생생물(Protozoa), 부착조류(Attached algae), 동물플랑크톤(Zooplankton), 수서곤충(Aquatic insects) 등이었다. 식성은 잡식성이었으나 섭취한 먹이의 양이 80% 이상은 수서곤충인 깔다구류(Chironomidae spp.) 유충의 동물성 먹이를 섭식하고 있었다. 긴몰개의 크기가 클수록 동물성 먹이인 수서곤충을 섭식하는 양과 섭식 빈도가 증가하였으며 수서곤충을 섭식한 개체는 식물성 먹이를 섭취하지 않았다.

Keywords

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