Survival and Reproductive Success of Hatchery YY Male Brook Trout Stocked in Idaho Streams

2018 ◽  
Vol 147 (3) ◽  
pp. 419-430 ◽  
Author(s):  
Patrick A. Kennedy ◽  
Kevin A. Meyer ◽  
Daniel J. Schill ◽  
Matthew R. Campbell ◽  
Ninh V. Vu
Keyword(s):  
Reproductive Success ◽  
Brook Trout

The relative influence of breeding competition and habitat quality on female reproductive success in lacustrine brook trout (Salvelinus fontinalis)

2005 ◽  
Vol 62 (12) ◽  
pp. 2694-2705 ◽  
Author(s):  
Paul J Blanchfield ◽  
Mark S Ridgway
Keyword(s):  
Reproductive Success ◽  
Groundwater Flow ◽  
Habitat Quality ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Relative Influence ◽  
Egg Survival ◽  
Female Reproductive Success ◽  
Redd Superimposition ◽  
Spawning Sites

Egg losses for female salmonines primarily occur through competition for egg incubation sites (i.e., redds) and the differences in quality among these sites. Through detailed observations and an experiment linking egg survival to groundwater flow, we estimated the relative influence of redd superimposition and habitat quality on female reproductive success for a population of lake-spawning brook trout (Salvelinus fontinalis). Three quarters of all spawning sites were reused by multiple females; however, brood loss was much less (28%–38%) because large females spawned earlier and constructed deeper nests. The relationship between groundwater flow rate and egg survival was not linear, with consistent egg survival occurring only at sites with flows over 20 mL·m–2·min–1. Varying scenarios of redd superimposition and habitat-related egg survival resulted in an estimated 4%-21% of deposited eggs surviving to emergence and greatly reduced the size-related advantages of larger females owing to fecundity. Limited numbers of high-quality spawning sites and overall low survival of eggs resulted in habitat being the dominant route of egg loss. In the absence of female competition, spawning habitat alone accounted for egg losses of 67%–91% and points to the importance of physical habitat features in the maintenance of brook trout populations.

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