Spawning-related movement patterns of a unique rainbow trout (Oncorhynchus mykiss) population in a South Dakota headwater stream

Figures & data

Figure 1. Mean daily discharge (solid line) and time period of observed rainbow trout movement during spawning (diagonal lines) for radio-tagged rainbow trout in Spearfish Creek, South Dakota, from 1 January to 30 June 2007.

Figure 2. Mean daily discharge versus rainbow trout movement in Spearfish Creek, South Dakota. Pearson's correlation coefficient and significance value are given.

Table 1. Summary of rainbow trout movement for the pre-spawn and spawning periods in Spearfish Creek, South Dakota from 5 December 2006 to 19 June 2007.

Time period	Fish frequency	TL (mm)	W (g)	N movements	Total movement (m)	Net movement (m)	Distance/ movement (m)
Pre-spawn	151.453	232	144	25	377	50	15
	151.493	224	116	22	178	25	8
	151.632	318	302	18	93	−5	5
	151.874	282	251	26	165	50	6
	151.972	331	367	20	371	5	16
	Mean	277 (22)	236 (47)	22 (2)	236 (59)	25 (11)	10 (2)
Spawning	151.453	232	144	3	2429	1	810
	151.493	224	116	5	1678	−532	336
	151.632	318	302	7	520	485	74
	151.874	282	251	2	1870	4	935
	151.972	331	367	4	1807	−3	463
	Mean	277 (22)	236 (47)	4 (1)	1661 (313)	−9 (161)	524 (157)
Notes: Total movement is sum of distance moved regardless of direction. Net movement indicates directional movement (a negative value is downstream movement, while a positive value represents upstream movement). Standard errors are reported in parentheses.