CHARACTERCTERISTICS OF OTOLITH STRONTIUM MARKING AND ITS TIME LAGS OF LARVAL CYPRINUS CARPIO [鲤(Cyprinus carpio)仔鱼耳石锶(Sr)标记及其时滞特征的研究]

作者：Qiu C.; Jiang T.; Chen X.-B.; Liu H.-B.; Yang J.^*

来源：海洋与湖沼, 2019, 50(4): 903-912.

DOI：10.11693/hyhz20190100003

• Artificial enhancement release
• Cyprinus carpio
• Otolith
• Strontium marking
• X-ray electron probe microanalysis

We selected the larval common carp (Cyprinus carpio) as a targeted fish and immersed the fish in SrCl2•6H2O solution for 2d to understand the effect of Sr-marking and the time lag characteristics of the appearance and completion of corresponding marking. The results show no obvious effect of Sr-marking on mortality and growth of the fish. The marking rings on common carp otoliths were clear as detected by X-ray electron microprobe microanalysis (EPMA). The Sr/Ca ratio along line transects from the core (0μm) to the edge of the otoliths shows a significant elevated range in the treatment group. Meanwhile, a clear marking ring of high-Sr content is visible in otolith of Sr-marked C. carpio, and the ring remained detectable in 5-250 days after the immersion. In addition, time lags of 3- and 6-day were found between the first day of immersion and the day of Sr appearance in otolith, and between the last day of immersion and the day of Sr disappearance in otolith, respectively. The present approach of exogenous Sr-marking provides a useful otolith-marking tool for larval C. carpio, and it is stable, reliable, and feasible.

• 单位
  南京农业大学