Fig. 11. Mean relative abundance (geometric mean number per 305 m of gillnet per night) of siscowets in Michigan
waters of Lake Superior during 1985-1992 and 1993-2000 based on summer (July-August) graded-mesh gillnet surveys

Siscowets in MI waters

 

 

 

 

 

 


 

 

Fig. 25. Catch-per-unit effort (fish/305 m) of siscowet caught in graded-mesh
gillnet surveys in management units of Lake Superior averaged for June of
1996, 1997, 1999, 2000, and 2003 and August/September of 1997.

Figure 25

 

 

 

 

 

 


 

 

Fig. 11. Relative abundance of wild and hatchery-origin (lean) lake trout in U.S. management units of Lake
Superior (Fig. 1) expressed as the annual geometric mean number caught per km of gillnet per night fished
(fish/km/night) from standardized annual spring (April-June) bottom-set, gillnet surveys during 2001-2005
(vertical bars in chronological order). Horizontal black bars represent the geometric mean catch-per-unit
effort for 1993-2000 (Sitar et al. 2007). Asterisks indicate years when no surveys were conducted.

Figure 11b

 

 

 

 

 

 


 

 

Fig. 8. Year-class strength (+/-SE, number/ha) at age 1 of cisco estimated from annual U.S. Geological
Survey (USGS) bottom trawling each spring (May-June) at four fixed stations in Thunder Bay, 1989-2005 (a);
estimated number of male and female cisco of different year-classes at large in Thunder Bay, based on
USGS acoustic and mid-water trawling, during November 2005 (b); and year-class composition of cisco
harvested by the November 2005 roe fishery (c).
Graphs from Yule et al. (2008a)

Figure 8

 

 

 

 

 

 


 

 

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