Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Morphological Analysis of Patterns of Deformities and Multiple Symptoms in Cultured Blackhead Seabream Acanthopagrus schlegeli Juveniles

인공종묘 감성돔(Acanthopagrus schlegeli) 치어에서 발생하는 형태이상의 종류 및 다발성증상에 대한 형태학적 분석

  • Kim, Yang-Su (Oshima Branch, Fisheries Laboratories, Kinki University) ;
  • Go, Hyun-Jung (Division of Fisheries, Taean Country Office) ;
  • Lee, Si-Woo (South Sea Fisheries Institute, National Fisheries Reserch and Development Institute) ;
  • Jeong, Gwan-Sik (Division of Marine Technology, Chonnam National University)
  • 김양수 (긴끼대학교 수산연구소) ;
  • 고현정 (태안군청 수산과) ;
  • 이시우 (국립수산과학원 남서해수산연구소) ;
  • 정관식 (전남대학교 수산해양대학)
  • Received : 2015.05.21
  • Accepted : 2015.07.24
  • Published : 2015.08.31
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Abstract

This study aims to investigate the patterns and incidence rates of morphological deformities during artificial fingerling production of blackhead seabream (BSB, Acanthopagrus schlegeli) juveniles by visual and soft X-ray observations of BSB juveniles (n=881) collected from four industrial hatcheries. Using both methods, we observed seven types of external deformity ($11.2{\pm}4.4%$) and eight types of skeletal deformity ($53.4{\pm}5.1%$). Lordosis occurred in all hatcheries with the highest frequency and the mean frequency was $13.1{\pm}4.4%$ (24.5% in total abnormal) by soft X-ray. Although they had a similar standard length (SL), juveniles with lordosis had a significantly lower condition factor and body weight than normally developed juveniles (P<0.05); normal distribution curves of histogram of body proportions, i.e., body height (BH)/head length (HL) and trunk (=SL-HL)/BH, indicated differences between normally developed juveniles and those with lordosis. In addition, 59% of juveniles with lordosis had vertebral curvature of less than $20^{\circ}$, generally at the $17^{th}$ vertebrae. It is expected that the above results will be used as basic data necessary for determining the cause of lordosis and for developing techniques to prevent this symptom in the fingering production industry of BSB juveniles.

Keywords

References

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