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Table 1 The variation of pH and salinity monthly at six sampling sites

From: First reference on reproductive biology of Butis koilomatodon in Mekong Delta, Vietnam

Sampling sites pH Salinity
DHTV 7.85 ± 0.02b 12.33 ± 2.51ab
CLDST 7.81 ± 0.02ab 10.42 ± 1.47a
TDST 7.96 ± 0.06b 14.00 ± 2.06ab
HBBL 7.66 ± 0.05a 18.58 ± 1.47bc
DHBL 7.81 ± 0.03ab 23.50 ± 1.48c
DDCM 7.63 ± 0.05a 23.17 ± 1.21c
Shapiro-Wilk test NJ = 0.96, p < 0.01 NJ = 0.99, p > 0.10
The Levene’s Test   F = 2.26, p = 0.06
One-way ANOVA   F = 10.16, p = 0.02
Kruskal-Wallis H Test χ2 = 29.48, p < 0.01  
Month pH Salinity
Jul-19 7.78 ± 0.03 12.83 ± 2.65a
Aug-19 7.87 ± 0.03 11.33 ± 2.80a
Sep-19 7.93 ± 0.04 11.17 ± 2.51a
Oct-19 7.77 ± 0.19 11.83 ± 2.39a
Nov-19 7.73 ± 0.10 13.00 ± 2.68a
Dec-19 7.77 ± 0.08 15.33 ± 3.07ab
Jan-20 7.78 ± 0.03 21.83 ± 2.60ab
Feb-19 7.77 ± 0.04 25.83 ± 2.01b
Mar-19 7.73 ± 0.03 26.17 ± 2.06b
Apr-20 7.78 ± 0.05 22.00 ± 2.07ab
May-20 7.80 ± 0.04 17.33 ± 2.62ab
Jun-20 7.72 ± 0.07 15.33 ± 2.50ab
The Levene’s Test   F = 0.62, p = 0.81
One-way ANOVA   F = 0.80, p = 0.00
Kruskal-Wallis H Test χ2 = 11.95, p = 0.37  
  1. DHTV Duyen Hai, Tra Vinh, CLDST Cu Lao Dung, Soc Trang, TDST Tran De, Soc Trang, HBBL Hoa Binh, Bac Lieu, DHBL Dong Hai, Bac Lieu, DDCM Dam Doi, Ca Ma. The difference letters (a and b) in each category showed a significant difference