Differences in brain morphology of brown trout across stream, lake, and hatchery environments.

It has been suggested that a trade-off between cognitive capacity and developmental costs may drive brain size and morphology across fish species, but this pattern is less well explored at the intraspecific level. Physical habitat complexity has been proposed as a key selection pressure on cognitive capacity that shapes brain morphology of fishes. In this study, we compared brain morphology of brown trout, , from stream, lake, and hatchery environments, which generally differ in physical complexity ranging from low habitat complexity in the hatchery to high habitat complexity in streams and intermediate complexity in lakes.

Hope After TBI Begins with Rehabilitation.

Traumatic brain injury (TBI) is one of the leading causes of long-term disability in the United States. Persons with TBI can experience numerous alterations in functional status, self-care ability, and cognitive, emotional, and social functioning. Understanding TBI features, treatment, and rehabilitation is imperative for nurses in every setting.

Reduced exploration capacity despite brain volume increase in warm-acclimated common minnow.

While evidence suggests that warming may impact cognition of ectotherms, the underlying mechanisms remain poorly understood. A possible but rarely considered mechanism is that the metabolic response of ectotherms to warming is associated with changes in brain morphology and function. Here, we compared aerobic metabolism, brain volume, boldness and accuracy of maze solving of common minnows () acclimated for 8 months to either their current optimal natural (14°C) or warm (20°C) water temperature.

Oil exposure alters social group cohesion in fish.

Many animal taxa live in groups to increase foraging and reproductive success and aid in predator avoidance. For fish, a large proportion of species spend all or part of their lives in groups, with group coordination playing an important role in the emergent benefits of group-living. Group cohesion can be altered by an array of factors, including exposure to toxic environmental contaminants.