Juvenile salmonid migratory behavior at the mouth of the Columbia River and within the plume

Table 3 Summary of residence time data for emigrating yearling Chinook salmon, steelhead, and subyearling Chinook salmon by season

Species/stock	Season	N	Residence time (days)
Species/stock	Season	N	Mean	SD	Minimum	Maximum	Median
CH1	Early	247	0.7	1.4	0.1	12.3	0.4
	Late	338	3.3	5.4	0.1	34.7	0.6
	Total	585	2.2	4.4	0.1	34.7	0.5
STH	Early	63	0.3	0.2	0.1	1.1	0.2
	Late	119	0.8	1.4	0.1	10.8	0.3
	Total	182	0.6	1.2	0.1	10.8	0.2
CH0	Total	811	3.6	5.7	0.1	28.4	1.2
All species		1,578	2.8	5.0	0.1	34.7	0.7

Early season detections include 5 to 18 May 2010 and late season detections include 19 May to 6 July 2010 for yearling Chinook salmon and steelhead. Residence time was calculated from the last detection at the mouth of the Columbia River (rkm 8.3. 4.5, and 2.8) to the last detection on the plume array. CH1, yearling Chinook salmon; STH, steelhead; CH0, subyearling Chinook salmon.

ISSN: 2050-3385