Applied Animal Behaviour Science 

TL;DR: The scientific data that allows us to interpret the effects of disease, handling, transport, food deprivation, and slaughter technique on fish welfare are reviewed and caution should be taken when interpreting "abnormal" fish behaviour.

TL;DR: In this paper, the authors review many of the potential stressors that may adversely affect animals living in captivity and present a suite of behavioral or physiological responses that will clearly indicate the cause of those responses; rather, it is up to us as managers and caretakers of animals in captivity to evaluate enclosures and husbandry practices to ensure the optimal well-being of animals.

TL;DR: In this paper, the authors define environmental enrichment as an improvement in the biological functioning of captive animals resulting from modifications to their environment, which can include increased lifetime reproductive success, increased inclusive fitness or a correlate of these such as improved health.

TL;DR: The domestication process has frequently reduced the sensitivity of animals to changes in their environment, perhaps the single-most important change accompanying domestication, and resulted in modified rates of behavioral and physical development.