Are river protected areas sufficient for fish conservation? Implications from large-scale hydroacoustic surveys in the middle reach of the Yangtze River

Table 3 Summary of eight acoustic surveys conducted in MRYR from 2010 to 2017

Year	Survey ID	Sampling date	Mean water level* (m)	Season	Survey period (d)	River stretch (from-to)	Start-endpoint (rkm)
2010/2011	I	Dec 18, 2010–Mar 5, 2011	40.31	Low water	37	Yichang–Wuhan	1674.7–1038
2014/2015	II	Aug 13, 2014–Sept 9, 2014	48.15	High water	32	Yichang–Hukou	1674.7–768
	III	Dec 18, 2014–Feb 7, 2015	40.28	Low water	36	Yichang–Hukou	1674.7–768
2015	IV	Apr 25, 2015–Jun 6, 2015	42.64	Rising water	33	Yichang–Hukou	1674.7–768
	V	Sept 11, 2015–Oct 20, 2015	44.80	Falling water	25	Yichang–Wuhan	1674.7–1038
2016	VI	Jan 9, 2016–Feb 26, 2016	40.69	Low water	31	Yichang–Hukou	1674.7–768
	VII	Nov 22, 2016–Jan 2, 2017	40.53	Low water	44	Yichang–Hukou	1674.7–768
2017	VIII	May 14, 2017–Jul 17, 2017	45.01	Rising water	30	Yichang–Hukou	1674.7–768

Mean water level* is the mean water level determined by the Yichang Hydrological Monitoring Station (YHMS)

ISSN: 1472-6785