We tested the hypothesis that dispersal is sex biased in an unexploited population of brook trout, Salvelinus fontinalis, on Cape Race, Newfoundland, Canada. Based on the assumptions that trout are promiscuous and that reproductive success is limited primarily by either number of mates (males) or fecundity (females), we predicted that males would disperse greater distances than females. We also...

BACKGROUND In mammals it is well known that infections can lead to alterations in reproductive function. As part of the innate immune response, a number of cytokines and other immune factors is produced during bacterial infection or after treatment with lipopolysaccharide (LPS) and acts on the reproductive system. In fish, LPS can also induce an innate immune response but little is known about ...

The Big Hole River basin in southwestern Montana supports the only indigenous, self-sustaining fluvial population of Arctic Grayling Thymallus arcticus conterminous United States, but is fragmented by numerous low-head irrigation diversion dams. Denil fishways at 63 dams provide and other fishes opportunities for year-round access to critical habitats; however, their efficiency has not been eva...

Large koaro (Galaxias brevipinnis) were observed drift-feeding in the water column and from the surface in a pool in Cave Brook, a tributary of Big River draining the Gouland Downs, Kahurangi National Park, an area free of introduced trout. This contrasts with the habitat commonly perceived as being koaro habitat which are cascades and fast, boulder riffles. It is suggested that sampling limita...

-Brook trout Salvelinus fontinalis and other salmonids in Appalachia typically inhabit headwater watersheds, where food resources may limit growth. We monitored the feeding trends of a brook trout population in central Appalachia over the course of 2 years to determine variation in feeding intensity and important prey items. One terrestrial beetle family, Scarabaeidae, provided a disproportiona...

—In regional survey studies of habitat and fish assemblages, potentially important biological interactions can be masked by strong gradients in habitat variables and associated collinearities among biological variables. We used structural equation modeling to compare the causal influences of local habitat and biotic factors on fish density in rivers and to determine the extent to which the set ...

In aquaculture, the process of hybridization is used to produce animals that have better growth rates, meat quality, and higher resistance and tolerance to environmental variations than their parental species. The identification of a hybrid fish may require a DNA-based technology that is an expensive process. In this study, the sagittal otolith shape of hatchery-reared brook trout (Salvelinus f...

The Brook Trout Salvelinus fontinalis is an economically important salmonid that has been stocked worldwide. Because of the difficulty culturing southern Trout, domesticated northern have throughout southeastern United States. Little research dedicated to understanding foraging dynamics various forms species occur within streams. Given water velocity shown a strong influence on habitat selectio...

Complete fixation of arctic charr (Salvelinus alpinus) mitochondrial DNA (mtDNA) was observed in a southern Québec population of lake trout (S. namaycush). This introgressed population otherwise appeared to be normal with regard to lake trout morphology and three species-diagnostic microsatellite loci. Arctic charr do not occur in the area, suggesting that the hybridization event was prehistori...