Bioelectrical impedance analysis (BIA) analysis was carried out in the field on anaesthetized Salvelinus fontinalis electrofished from a mountain stream in Alberta, Canada; the fish were then sacrificed for subsequent analysis of tissue composition. Water content was assessed by comparing wet and dry mass, and total body lipid content was measured by Soxhlet extraction with petroleum ether. A m...

Fish are significant predators of amphibian larvae in streams and can detect these through both visual olfactory cues. The ability to effectively recognize cues may depend on the evolutionary history predator prey such that recently introduced not be recognized as readily those have consistently coexisted with species. As such, relatively recent introduction rainbow trout (Oncorhynchus mykiss) ...

Abstract The use of sterile triploids in aquaculture is currently limited because reduced performance situations aerobic stress such as high temperature, hypoxia, and exhaustive exercise. Many studies have therefore attempted to find underlying metabolic differences between their diploid counterparts improve triploid rearing protocols. This study investigated the effects triploidy on postprandi...

Diet, age, and growth rate influences on fish mercury concentrations were investigated for Arctic char (Salvelinus alpinus) brook trout fontinalis) in lakes of the eastern Canadian Arctic. We hypothesized that faster-growing have lower because dilution, a process whereby more efficient dilutes fish’s burden. Using datasets 57 133 char, linear regression modelling showed age diet indices dominan...

Abstract A fundamental assumption of mark‐recapture studies is that individuals do not lose their marks or tags, because tag loss can lead to biased parameter estimates. Retention 8‐mm full‐duplex and 12‐mm half‐duplex passive integrated transponder (PIT) tags implanted in the abdomen, opercular musculature, dorsal sinus age‐0+ hatchery male brook trout ( Salvelinus fontinalis ) was evaluated l...

Physiological indicators such as lipid peroxidation and enzymes involved in aerobic/anaerobic energy metabolism were measured in pure and hybrid lines of wolffish juveniles (Anarhichas minor, ♀ A. minor ! ♂ A. lupus). Interspecific hybridization was introduced as a powerful tool to promote augmentation of phenotypic variability and consequently improve our capacity for the detection of clear ph...

—An understanding of habitat relationships for bull trout Salvelinus confluentus remains an important component for identifying future restoration, management, and recovery efforts. We examined past efforts through a comprehensive synthesis of peer-reviewed articles evaluating bull trout habitat relationships, and we used field data within classification tree analysis (CTA) to improve our under...

—Monitoring of salmonid populations often involves annual redd counts, but the validity of this method has seldom been evaluated. We conducted redd counts of bull trout Salvelinus confluentus in two streams in northern Idaho to address four issues: (1) relationships between adult escapements and redd counts; (2) interobserver variability in redd counts; (3) sources of interobserver variability;...