Journal of Tianjin Agricultural University ›› 2013, Vol. 20 ›› Issue (4): 10-13.

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Effects of pH on Average Daily Growth Rate and Gill Microstructure of Juvenile Scophthalmus maximus

WANG Shuang-yao1, MAO Shou-kang1, MIAO Zhi-ou1, JIANG Zhi-qiang1,Corresponding Author, YANG Jing-jing1, WEN Shi-hui1, YAO En-chang2   

  1. 1. Key Laboratory of Mariculture & Stock Enhancement in North China’s Sea, Ministry of Agriculture, Dalian Ocean University, Dalian 116023, Liaoning Province, China;;
    2. Dalian Dahua Jiasen Marine Resource Assets Appraisal Co. Ltd, Dalian 116023, Liaoning Province, China
  • Received:2013-10-18 Published:2019-10-21

Abstract: The average daily growth rate (AGR) and the microstructure of the gill of juvenile turbot (Scophthalmus maximus) were examined under different pH levels. The results show that the AGR decreased with increasing pH levels, and the AGR of pH 8.3 and 8.8 groups were significantly lower than that of other treatment groups (P<0.05). When the fish was exposed to pH 6.3, the lamellar epithelia were keratinized severely, no significant changes in lamellar epithelia were observed from pH 6.8 to 7.8, keratinization and lifting were found in the lamellar epithelia at pH 8.3, and the keratinization was more severe at pH 8.8. The results suggest that pH 6.8~7.8 is considered as the optimum ranges for juvenile turbot.

Key words: pH, Scophthalmus maximus, average daily growth rate, gill, microstructure

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