Table 1 Sampling times for the four study reaches, Potou Town (PT), Chishui Town (CZ), Chishui City (CS) and Hejiang County (HJ), in the Chishui River, during the study period

2012

–

–

1 May–10 May

29 Sep–7 Oct

21 May–10 Jun

10 Oct–30 Oct

5 May–23 May

6 Oct–26 Oct

2013

21 May–28 May

5 Oct–14 Oct

22 May–3 Jun

10 Oct–19 Oct

2 May–22 May

29 Sep–18 Oct

1 May–21 May

28 Sep–18 Oct

2014

19 May–29 May

1 Oct–10 Oct

19 May–28 May

5 Oct–15 Oct

9 May–30 May

11 Oct–28 Oct

4 May–25 May

27 Sep–17 Oct

2015

4 Jun–14 Jun

1 Oct–10 Oct

10 Jun–20 Jun

27 Sep–8 Oct

11 May–30 May

21 Sep–20 Oct

3 May–21 May

28 Sep–18 Oct

2016

9 May–18 May

25 Sep–5 Oct

20 May–29 May

17 Oct–26 Oct

25 May–15 Jun

18 Oct–27 Oct

3 May–22 May

28 Sep–16 Oct

2017

5 May–14 May

10 Oct–19 Oct

5 May–14 May

4 Oct–12 Oct

2 May–22 May

20 Sep–18 Oct

14 May–2 Jun

2 Oct–22 Oct

2018

1 May–8 May

20 Oct–30 Oct

26 May–5 Jun

19 Oct–28 Oct

12 May–29 May

7 Oct–26 Oct

1 May–19 May

11 Oct–29 Oct

2019

10 May–29 May

10 Oct–19 Oct

20 May–28 May

15 Oct–24 Oct

12 May–31 May

21 Sep–10 Oct

6 May–25 May

5 Oct–26 Oct

2020

17 Jun–26 Jun

19 Sep–28 Sep

21 May–30 May

26 Sep–8 Oct

23 May–12 Jun

16 Sep–5 Oct

5 May–25 May

6 Oct–25 Oct

2021

22 May–1 Jun

11 Sep–19 Sep

29 May–8 Jun

15 Oct–25 Oct

28 May–15 Jun

25 Sep–24 Oct

4 May–25 May

6 Oct–26 Oct