[논문]영덕오십천 소하천인 대서천에 서식하는 자가사리 Liobagrus mediadiposalis의 자치어 형태발달

박재민; 한경호

doi:10.35399/isk.35.2.2

영덕오십천 소하천인 대서천에 서식하는 자가사리 Liobagrus mediadiposalis의 자치어 형태발달
Development of Larvae and Juveniles of the Liobagrus mediadiposalis from Daeseocheon Stream in Yeongdukosipcheon 원문보기

Korean journal of Ichthyology = 한국어류학회지, v.35 no.2, 2023년, pp.75 - 82

박재민 (경상북도 토속어류산업화센터) , 한경호 (전남대학교 수산과학과)

초록
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본 연구에 사용된 시료는 2021년 4월 21일과 5월 16일 2회에 걸쳐 경북 영덕군에 위치한 대서천에서 자가사리와 난괴를 채집하였다. 수정란 크기는 3.30~3.92 (3.57±0.19) mm (n=30)였고, 수온 17.0~20.0℃에서 부화까지 소요된 시간은 152~155시간이었다. 부화 직후 자어는 전장 6.43~6.67 (평균 6.55±0.07) mm (n=30)로 입과 항문은 완전히 열리지 않았고, 난황을 가지고 있었다. 부화 후 9일째 후기자어는 전장 11.0~13.8 (12.3±0.70) mm (n=30)로 꼬리 끝의 미부봉상골이 위쪽을 향해 45°로 완전히 휘어졌다. 부화 후 16일째 치어는 전장 15.8~18.2 (16.8±0.77) mm (n=30)로 지느러미 줄기 수는 등지느러미 8개, 뒷지느러미 17개, 배지느러미 8개로 정수에 도달하였다. 연구 결과 근연종들 간 초기생활사에서 부화자어 크기, 지느러미 반문형태 등에서 차이를 확인할 수 있었다.

Abstract ▼ AI-Helper

The samples used in this study were collected on two occasions (April 21 and May 16, 2021) from Liobagrus mediadiposalis and spawned egg masses located under rocks in Daeseocheon, Yeongdeok-gun, Gyeongsangbuk-do. Fertilized eggs ranged in size from 3.30~3.92 (average 3.57±0.19) mm (n=30), and it took 152~155 hours to hatch at water temperatures of between 17.0 and 20.0℃. Newly hatched larvae immediately post-hatching had a total length of 6.43~6.67 (6.55±0.07) mm (n=30), and were characterized by the retention of a yolk sac and an incompletely open mouth and anus, consistent with the yolk. On the 9 days post-hatching, the postflexion larvae had grown to length of between 11.0~13.8 (12.3±0.70) mm (n=30), and the caudal bone at the tip of the tail was bent upwards at an angle of 45°, thereby indicating the transition to the late larval growth stage. On the 16 days post-hatching, the total length of juvenile had increased to between 15.8~18.2 (16.8±0.77) mm (n=30), and the number of fins reached a fixed number of 8 dorsal, 17 anal, and 8 pelvic fins. On the basis of the findings of this study, we were able to confirm differences in the size of hatching larvae and fin mottle patterns in the early life history of related species.

주제어

표/그림 (5)

그림 Fig. 1. Photographs showing the habitat for Liobagrus mediadiposalis in the Daeseocheon (A) in Yeongduk-gun, Gyeongsangbuk-do, Korea and egg mass of spawning ground (B), Female adult (C).
그림 Fig. 2. Egg development of Liobagrus mediadiposalis. A: gastrula stage; B: middle gastrula stage; C: embryo and kuffer's vesicle formation; D: late gastrula stage; E: 4~5 myotomes; F: 10~15 myotomes; G: movement of embryo; H: development of eyes pupil; I: development of primordial caudal fin; J: appearance of two pairs barbel; K: development of melanophore in eyes; L: embryo just before hatching; M: hatched larvae. Scale bars=1.00 mm.
그림 Fig. 3. Larvae and juveniles development of Liobagrus mediadiposalis. A: newly hatched larvae, 6.55 mm in total length (TL); B: 1 days after hatching (DAH) 6.96 mm in TL; C: 3 DAH 9.44 mm in TL; D: 6 DAH 10.6 mm in TL; E: 9 DAH 12.3 mm in TL; F: 11 DAH 13.8 mm in TL; G: 16 DAH 16.8 mm in TL; H: 20 DAH 18.2 mm in TL; I: 28 DAH 23.8 mm in TL; J: 100 DAH 34.4 mm in TL. Scale bars=1.00 mm.
표 Table 1. Time required for embryo development stages of genus Liobagrus from Korea
표 Table 2. Comparison of egg and larvae characteristics in Liobagrus fishes

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