Abundance, growth, and life history characteristics of sympatric walleye (Sander vitreus) and sauger (Sander canadensis) in Lake Winnipeg, Manitoba

Diet of walleye and sauger and morphological characteristics of their prey in Lake Winnipeg

“…Lake Winnipeg supports a large commercial and recreational fishery for walleye (Sander vitreus) and sauger (Sander canadensis), bringing in roughly 3-5 million kilograms and millions of dollars to Manitoba every year (Johnston et al, 2012; State of the Lake Report, 2011), most of which is landed in the South Basin of the lake. Very little is known about the role in the food web of these two predatory species which is critical to their management.…”

Length rather than year-round spawning, affects reproductive performance of RAS-reared F-generation pikeperch, Sander lucioperca (Linnaeus, 1758) - Insights from practice

“…These findings contrast sharply with the common perception that large spawners produce more eggs of higher quality, which is supported by numerous studies (Feiner & F I G U R E 2 Number of eggs per female (a; n = 30) and fertilization (open circles; n = 30) and hatching rates (filled circles; n = 29) (b) versus standard length of female pikeperch for all six observed spawning periods Höök, 2015) and is recognized for fisheries management (Birkeland & Dayton, 2005). In freshwater percids a similar positive relation of absolute fecundity and/or egg quality with female age and/or size was observed (Johnston, Lysack, & Leggett, 2012;Wiegand, Johnston, Martin, & Leggett, 2004;Żivkov & Petrova, 1993). In pikeperch, however, the relative fecundity does not always show such a clear linear relationship.…”

Temporal and spatial patterns in pelagic trawl fish catches in Lake Winnipeg

“…Commercial landings of walleye, currently one of Lake Winnipeg's most valued species and one of the top predators in the lake, has increased dramatically in the last 10 years (Lumb et al, 2011). Catch-per-unit effort of walleye from index gill net surveys increased significantly in the south basin and the channel from 1979 to 2003 (Johnston et al, 2012), possibly associated with increased system productivity or high water levels. There were no clear trends in annual lakewide biomass of pelagic fish species in Lake Winnipeg from 2002 to 2008.…”