NOAA-NMFS-NWFSC TM-9: Table 3

U.S. Dept Commerce/NOAA/NMFS/NWFSC/Publications

NOAA-NMFS-NWFSC TM-9: Effectiveness of Predator Removal for Protecting Juvenile Fall Chinook Salmon Released from Bonneville Hatchery, 1991

Table 3. Electrofishing effort, number of northern squawfish removed, and number of coded-wire tags recovered from the digestive tracts of northern squawfish, release site study, 1991.


Northern squawfish removed						CWTs recovered^a
						Release site

Location^c	Mean effort^b (sec)	Mean number	Mean CPUE^d	Mean length (mm)	Mean weight (g)	Tanner Creek^e	Mid- stream^f

O1	1,270	47	120	364	692	38	0
O2	1,755	46	92	341	583	53	0
O3	1,577	58	135	335	539	1	2
O4	1,758	56	114	316	479	0	1
W1	1,499	62	151	366	712	0	0
W2	2,241	33	53	307	465	3	0
W3	1,389	16	38	351	636	0	0
W4	1,836	18	33	334	549	0	0
TC	777	19	85	380	798	56	0
Total	---	---	--	--	--	151	3
mean	1,567	39	91	343.8	605.9	--	-

^a CWT = coded wire tag (Agency/Data 1/Data 2 codes). Number of CWTs recovered in the digestive tracts of northern squawfish represent a minimum number of juvenile salmon ingested.
^b Mean effort per sampling period for each location (see Appendix Table B1).
^c Location codes (2 characters): TC = Tanner Creek transect area; other Columbia River transect areas, where, 1st character, O = Oregon shoreline, and W = Washington shoreline; 2nd character, 1-4, transect areas (refer to Figure 3 for precise locations).
^d CPUE = catch per unit effort, number of fish caught per hour (Appendix Table B1).
^e CWT code = 07/14/16, released 24 June.
^f CWT code = 07/46/49, released 24 June.

Use your browser's BACK button to return to the text.

Table of Contents