Trout

Impact of environmental complexity and stocking density on affective states of rainbow trout (Oncorhynchus mykiss)

Environmental condition, such as environmental complexity or stocking density, can directly or indirectly influence animal emotion and ultimately, affective state. Affective states of animals can be assessed through judgement bias tests, evaluating responses to ambiguous situations. In this study, we...

Year Published: 2022Topics: Emotion, Pain, & Sentience, Environmental Enrichment, Housing, Stocking DensityAnimal Type: Fish, Trout

Citation: Anderson, M. G., Campbell, A. M., Kuhn, D. D. et al. 2022. Impact of environmental complexity and stocking density on affective states of rainbow trout (Oncorhynchus mykiss). Animal Cognition 25(5), 1331–1343.

Social buffering of the stress response: Insights from fishes

Social buffering of stress refers to the effect of a social partner in reducing the cortisol or corticosterone response to a stressor. It has been well studied in mammals, particularly those that form pair bonds. Recent studies on fishes suggest...

Year Published: 2022Topics: Emotion, Pain, & Sentience, Social Housing & CompanionshipAnimal Type: Fish, Other Fish, Salmon, Shark & Ray, Tilapia, Trout, Zebrafish

Citation: Gilmour, K. M., Bard, B. 2022. Social buffering of the stress response: Insights from fishes. Biology Letters 18(10), 20220332.

Looking beyond the shoal: Fish welfare as an individual attribute

Welfare is an individual attribute. In general, providing captive nonhuman animals with conditions conducive to good welfare is an idea more easily applied when dealing with few individuals. However, this becomes much harder—if not impossible—under farming conditions that may imply...

Year Published: 2022Topics: PersonalityAnimal Type: Fish, Other Fish, Salmon, Tilapia, Trout, Zebrafish

Citation: Torgerson-White, L., Sánchez-Suárez, W. 2022. Looking beyond the shoal: Fish welfare as an individual attribute. Animals 12(19), 2592.

The effect of substrate on water quality in ornamental fish tanks

Almost all home aquaria contain substrate, either as intentional enrichment or for aesthetic purposes. For fishes, benefits of structural enrichment have been well considered, particularly in research and aquaculture settings. However, our understanding of the impacts of tank substrate as...

Year Published: 2022Topics: Husbandry & ManagementAnimal Type: Fish, Other Fish, Salmon, Tilapia, Trout, Zebrafish

Citation: Vanderzwalmen, M., Sánchez Lacalle, D., Tamilselvan, P. et al. 2022. The effect of substrate on water quality in ornamental fish tanks. Animals 12(19), 2679.

Finding the “golden stocking density”: A balance between fish welfare and farmers’ perspectives

The effects of stocking density on fish welfare are complex and involve many interacting parameters. This complex relationship between fish welfare, stocking density and influencing factors make it challenging to define a specific optimal (“golden”) stocking density. Indeed, previously published...

Year Published: 2022Topics: Stocking DensityAnimal Type: Fish, Other Fish, Salmon, Tilapia, Trout, Zebrafish

Citation: Saraiva, J. L., Rachinas-Lopes, P., Arechavala-Lopez, P. 2022. Finding the “golden stocking density”: A balance between fish welfare and farmers' perspectives. Frontiers in Veterinary Science 9, 930221.

Exploiting animal personality to reduce chronic stress in captive fish populations

Chronic stress is a major source of welfare problems in many captive populations, including fishes. While we have long known that chronic stress effects arise from maladaptive expression of acute stress response pathways, predicting where and when problems will arise...

Year Published: 2022Topics: PersonalityAnimal Type: Fish, Other Fish, Salmon, Tilapia, Trout, Zebrafish

Citation: Prentice, P. M., Houslay, T. M., Wilson, A. J. 2022. Exploiting animal personality to reduce chronic stress in captive fish populations. Frontiers in Veterinary Science 9, 1046205.

What is it like to be a bass? Red herrings, fish pain and the study of animal sentience

Debates around fishes' ability to feel pain concern sentience: do reactions to tissue damage indicate evaluative consciousness (conscious affect), or mere nociception? Thanks to Braithwaite's research leadership, and concerns that current practices could compromise welfare in countless fish, this issue's...

Year Published: 2022Topics: Biological Sampling & Physiological Measurement, Emotion, Pain, & SentienceAnimal Type: Fish, Other Fish, Salmon, Tilapia, Trout, Zebrafish

Citation: Mason, G. J., Lavery, J. M. 2022. What is it like to be a bass? Red herrings, fish pain and the study of animal sentience. Frontiers in Veterinary Science 9, 788289.

Positive effects of bubbles as a feeding predictor on behaviour of farmed rainbow trout

Occupational enrichment emerges as a promising strategy for improving the welfare of farmed animals. This form of enrichment aims to stimulate cognitive abilities of animals by providing them with more opportunities to interact with and control their environment. Predictability of...

Year Published: 2022Topics: Environmental Enrichment, Husbandry & ManagementAnimal Type: Fish, Trout

Citation: Kleiber, A., Le-Calvez, J. M., Kerneis, T. et al. 2022. Positive effects of bubbles as a feeding predictor on behaviour of farmed rainbow trout. Scientific Reports 12(1), 11368.

Gills just want to have fun: Can fish play games, just like us?

It is common to observe play in dogs, cats, and birds, but have we been ignoring play in one of the most common house pets of all… fish? Aquarium fish are often used as meditative decoration in family households, but...

Year Published: 2022Topics: Natural BehaviorAnimal Type: Fish, Other Fish, Salmon, Tilapia, Trout, Zebrafish

Citation: Eisenbeiser, S., Serbe-Kamp, É., Gage, G. J. et al. 2022. Gills just want to have fun: Can fish play games, just like us? Animals 12(13), 1684.

Clarification of early end-points for refinement of animal experiments, with specific reference to fish

Appropriate end-points are integral to the refinement of laboratory animal experiments. Our recent experience has highlighted that ambiguity around end-points is hampering their adoption in experiments that cause severe suffering to fish. In toxicology, the term endpoint (single word) refers...

Year Published: 2021Topics: Humane Endpoint, Welfare AssessmentAnimal Type: Fish, Other Fish, Salmon, Tilapia, Trout, Zebrafish

Citation: Ellis, T., Katsiadaki, I. 2021. Clarification of early end-points for refinement of animal experiments, with specific reference to fish. Laboratory Animals 55(3), 244-253.