›› 2019, Vol. 31 ›› Issue (2): 134-143.DOI: 10.13679/j.jdyj.20180034

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Using ring width on sagittal plane of otolith to reveal the growth of antarctica fish species: A case study of Electrona antarctica

Wei Lian1,2, Zhu Guoping1,2,3, Duan Mi1,2   

  • Received:2018-06-11 Revised:2018-07-13 Online:2019-06-30 Published:2019-06-30
  • Contact: Guoping ZHU

Abstract:

Ring width in the sagittal plane of otoliths can be considered as an indicator of fish growth, though this application has not yet been applied to any Antarctic species. Therefore, a case study was made using 50 Antarctic lanternfish Electrona antarctica collected from three locations at the Southern Kerguelen Plateau, Indian sector, in January–February 2016, to investigate the species’ growth. Akaike’s information criterion was used to select the direction of measurement after aging the fish, and the ring width in the sagittal plane was measured in the selected direction. Relationships between opaque rings, translucent rings, and annual rings in the otoliths and the age, standard length (SL), and body weight of fish were fitted with different functions. Relationships between accumulative ring width of the otolith sections and the age, SL, and body weight of fish were also fitted. The results indicated significant difference at the period of 3 years old. E. antarctic rapid growth during the first three years, and thereafter the growth rate decreased. Change in ring width was observed when fish attained sizes of 70 mm SL or 8 g. E. antarctica grew rapidly at smaller sizes, and ring width in the otoliths increased during both winter and summer. This study demonstrated variation in ring width in otoliths with age, SL, and body weight, and thus with life-history stage. To our knowledge, this is the first work to analyze ring width in otoliths in relation to the growth of an Antarctic fish, thereby extending the field of fish otolith research.

Key words: Electrona Antarctica, otolith, ring width, age, growth