Table 4. Frequency (% within parentheses) of use of different tag types to study single and multiple life stages of anadromous salmonids in the marine environment for studies focusing on behaviour (i.e. those focusing on only behaviour and both on behaviour and survival).

	Tag type
Type of study	Acoustic	Radio	Data Logger	PIT	CWT	External	Biological	Row Total
Single stage	61 (93.8/47.7)	19 (90.5/14.8)	8 (66.7/6.3)	7 (77.8/5.5)	7 (36.8/5.5)	24 (50/18.8)	2 (50/1.6)	128 (NA/100)
Multiple stages	4 (6.2/8)	2 (9.5/4)	4 (33.3/8)	2 (22.2/4)	12 (63.2/24)	24 (50/48)	2 (50/4)	50 (NA/100)
Column Total	65 (100/NA)	21 (100/NA)	12 (100/NA)	9 (100/NA)	19 (100/NA)	48 (100/NA)	4 (100/NA)	178 (100/100)

The first % value within parentheses shows the relative frequency of use of a given tag type across type of study. The second % value shows the relative frequency of use of different tag types to study one or multiple life stages. The total frequency of tag use (n = 340) exceeds that of reviewed papers (n = 207) because some studies used more than one type of tag. The category “Biological” includes otoliths and scales, whereas the category “External” includes carlin, cinch, Floy and Petersen disk tags and external markings.