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Fisheries Science

, Volume 85, Issue 6, pp 1001–1010 | Cite as

Digestive characteristics and blood chemistry profile of triploid rainbow trout Oncorhynchus mykiss: influence of body size and seasonal variation

  • Yuqiong Meng
  • Buying Han
  • Changzhong Li
  • Kangkang Qian
  • Xiaohong Liu
  • Xuemin Hu
  • Xu Yang
  • Haining Tian
  • Rui MaEmail author
Original Article Aquaculture

Abstract

Two experiments were conducted to evaluate the effects of body size and seasonal variation on organ indexes, digestive enzymes and plasma biochemistry parameters of triploid rainbow trout. Results in experiment 1 showed that compared with small fish, large fish had significantly (P < 0.05) higher values of organ indexes, higher plasma nutrient contents as well as higher specific activities of lipase in pyloric caeca and amylase in the intestine. Results in experiment 2 showed that fish in spring or winter had greater intestine length as well as lower specific activities of protease and lipase in pyloric caeca (P < 0.05). Fish in autumn had the highest specific activities of acid protease in the stomach and alkaline protease in pyloric caeca, lipase in pyloric caeca as well as nutrient contents in plasma, while fish in summer had the lowest liver and viscera weight as well as plasma nutrient contents. Based on data of organ indexes, digestive enzymes and plasma biochemistry parameters, the physiological status of triploid rainbow trout were affected by fish size and seasonal variation. Normal reference ranges of organ indexes and plasma biochemical parameters of triploid rainbow trout were preliminarily established, which are partly different from diploid trout.

Keywords

Triploid rainbow trout Digestive enzyme Plasma biochemistry parameter Organ index 

Notes

Acknowledgements

This research was financially supported by grants from the National Natural Science Foundation of China (No. 31560722) and Provincial Natural Science Foundation of Qinghai, China (2016-NK-135). We would like to thank Senzhong Ma, Jihong Wu, and Zhanyuan Luo for their support and help during this study.

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Copyright information

© Japanese Society of Fisheries Science 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Plateau Ecology and AgricultureQinghai UniversityXiningChina
  2. 2.College of Eco-Environmental EngineeringQinghai UniversityXiningChina
  3. 3.Qinghai Minze Longyangxia Ecological Aquaculture Co., Ltd.LongyangxiaChina

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