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Effect of using sodium bicarbonate to adjust the pH to different levels on water quality, the growth and the immune response of shrimp Litopenaeus vannamei reared in zero‐water exchange biofloc‐based culture tanks
Author(s) -
Zhang Kaiquan,
Pan Luqing,
Chen Wenbin,
Wang Chao
Publication year - 2017
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12961
Subject(s) - alkalinity , shrimp , litopenaeus , sodium bicarbonate , bicarbonate , biology , water quality , aquaculture , zoology , fishery , chemistry , ecology , fish <actinopterygii> , organic chemistry , endocrinology
The bioflocs technology proved to be a sustainable technique used in zero‐water exchange shrimp culture systems. However, the pH and alkalinity may decrease due to the biofloc formation process and Nitrification. A 48‐day experiment was performed to investigate the effects of different pH (7.1–7.6; 7.6–8.1) conditions on water quality, the growth and the health status of shrimp in biofloc technology ( BFT ) through using sodium bicarbonate to adjust pH respectively. Two pH treatments and one control were compared: T0 — control, T1 — pH 7.6 — NaHCO 3 , T2 — pH 8.1 — NaHCO 3 , each treatment consisted of three replicate tanks (90 L water volume) and each replicate stocked with 30 shrimp (equivalent to 333 shrimp m −3 ). Significant physical, chemical and biological differences ( P < 0.05) were detected among treatments. At the end of the experiment, water quality, the growth and the immune response of shrimp in control were significantly lower ( P < 0.05) than the other treatments. Moreover, the T2 treatment had a better performance in these three aspects. The results indicated that it was necessary to adjust the pH and alkalinity in the BFT , and a higher pH as well as alkalinity for shrimp growth and the stability of the BFT were more favourable.