NOAA-NMFS-NWFSC TM-9: Table 2

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 2. Number of northern squawfish removed by day (all electrofishing sites) and number of coded-wire tags recovered in digestive tracts of northern squawfish, release site study, 1991.


Northern squawfish removed						CWTs recovered^a
						Release site
Electrofishing period	Time shocker on (sec)	Total catch	CPUE^b	Mean length (mm)	Mean weight(g)	Tanner Creek^c	Mid- stream^d

25 June (0300-0900)	9,859	239	87	376	757	34	1
25-26 June (2100-0900)	22,681	746	118	346	617	83	2
26-27 June (2100-0900)	20,782	589	102	348	614	26	0
27-28 June (2100-0900)	17,511	438	90	338	572	8	0
Totals	70,833	2,012	-----	-----	-----	151	3

^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 CPUE = catch per unit effort, number of fish caught per hour.
^c CWT code = 07/14/16, released 24 June.
^d CWT code = 07/46/49, released 24 June.

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