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Effects of five fishing taggers on biochemical parameters of Ctenopharyngodon idellus.

YU Li-xiong1,2, DUAN Xin-bin2, CHEN Da-qing2*, LUO Hong-wei1,2, LIU Shao-ping2, GAO Lei2#br#   

  1. (1 Faculty of Life Sciences, Southwest University, Chongqing 400715, China; 2 Key Field Scientific Observing and Experimental Station of Fishery Resources and Environment of the Middle and Upper Reaches of the Yangtze River of the Ministry of Agriculture, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Science, Wuhan 430223, China).
  • Online:2017-04-10 Published:2017-04-10

Abstract: This study aims to assess the effects of five tagging methods on the biochemical para-meters of grass carps (Ctenopharyngodon idellus). The tagging methods include ultrasound mar-king, passive integrated transponder (PIT) marking, fluorescent marking, fins amputated marking, T-type marking, and control. One hundred and eight grass carps, with body length (18.54±2.04) cm and body weight (109.04±36.36) g, were randomly allocated into 6 groups, and each group contained three replications. Two blood samples were extracted randomly from each replication 1, 7 and 15 days after tagging. The results showed that levels of globulin (GLB), alanine aminotransferase (ALT) and aspartate aminotransferase (AST) in ultrasound marking group increased significantly 1 day after tagging. After 7 days, the level of chlorine (Cl) was elevated and GLB remained at high level, whereas the concentrations of ALT and AST declined to the normal level. After 15 days, the level of GLB declined but still remained higher than that in the control group. There was a significant increase in concentration of Cl in PIT marking group 7 days after tagging, and it declined to the normal level at day 15. The level of triglyceride (TG) in fins amputated marking group decreased significantly while the concentration of AST in T-type marking group increased significantly 1 day after tagging and both of them recovered at day 7. All of the biochemical parameters of fluorescent marking showed no significant difference as compared with the control group. In conclusion, fluorescent marking is appropriate for largescale tagging and the fish can be released soon after tagging. Grass carps with PIT marking, fins amputated marking or T-type marking are recommended to be kept for 7 days to eliminate the bad effects before release. Ultrasound marking has the greatest effect on the health status of grass carp, and it is advisable for fish to be kept at least for 15 days before release.

Key words: hilly apple orchard, rainwater harvesting-soil anti-seepage, empirical equation, loessial soil