Ovarian fluid enhances sperm velocity based on relatedness in lake trout, Salvelinus namaycush.

Ovarian fluid influences sperm performance in lake trout, Salvelinus namaycush.

The objectives of this study were to determine whether (i) the presence and concentration of ovarian fluid (OF) affects sperm performance traits, and (ii) variation in sperm performance traits is due to male identity, female identity, and/or male×female interactions in lake trout, Salvelinus namaycush. Spermatozoa from four males were activated in river water and OF from four females at two con...

Dynamics of Individual Growth in a Recovering Population of Lake Trout (Salvelinus namaycush)

In 1976 the Wisconsin Department of Natural Resources established a refuge for a nearly depleted population of lake trout (Salvelinus namaycush) at Gull Island Shoal, Lake Superior. The refuge was intended to reduce fishing mortality by protecting adult lake trout. We examined the growth dynamics of these lake trout during the period of recovery by comparing estimates of individual growth befor...

Genetic Research on Brook Trout and Lake Trout in Algonquin Park

Advances in genetic technology over the past two decades have provided a variety of molecular genetic marker systems that are enabling new insights into the historical and contemporary processes that influence fish biology. Genetic research on brook trout (Salvelinus fontinalis) and lake trout (Salvelinus namaycush) in Algonquin Park is allowing us to examine issues ranging from the phylogeogra...

Foraging mechanisms of siscowet lake trout (Salvelinus namaycush siscowet) on pelagic prey

PCB concentrations in lake trout (Salvelinus namaycush) are correlated to habitat use and lake characteristics.

This study considers the importance of lake trout habitat as a factor determining persistent organochlorine (OC) concentration. Lake trout is a stenothermal, cold water species and sensitive to hypoxia. Thus, factors such as lake depth, thermal stratification, and phosphorus enrichment may determine not only which lakes can support lake trout but may also influence among-lake variability in lak...