Trout

Preferred and optimal swimming speeds in rainbow trout (Oncorhynchus mykiss) at three temperatures (2025)

Sustained exercise in aquaculture is known to improve the health and growth of finfish. Implementing exercise regimes has become an increasing focus in aquaculture practice. This study examined the relationship between the preferred swimming speed (Upref) and the optimal swimming...

Year Published: 2025Topics: Husbandry & ManagementAnimal Type: Fish, Trout

Citation: Mittún, Ó. av F., Svendsen, M. B. S., Andersen, L. E. J. et al. 2025. Preferred and optimal swimming speeds in rainbow trout (Oncorhynchus mykiss) at three temperatures. Fishes 10(2), 64.

Heart rate monitoring during behavioral stress tests in bold and shy rainbow trout (Oncorhynchus mykiss)

Monitoring stress in captive fish is crucial for their welfare, but continuous physiological measures in unrestrained animals are challenging. Rainbow trout (Oncorhynchus mykiss) exhibit divergent personalities, ranging from bold to shy, which correlate with cortisol-mediated stress responses. To determine whether...

Year Published: 2025Topics: Welfare AssessmentAnimal Type: Fish, Trout

Citation: Kasiouras, E., Riberolles, G., Gräns, A. et al. 2025. Heart rate monitoring during behavioral stress tests in bold and shy rainbow trout (Oncorhynchus mykiss). Fishes 10(1), 23.

Effects of handling and surgical implant on juvenile wild trout: Physiological and behavioral impact

Fish involved in telemetry studies are usually handled, anaesthetized, and subjected to internal tag implantation, all of which have the potential to disrupt the fish's physiology, migratory patterns, food-seeking behavior, growth, and survival. As fish tagging is a widespread standard...

Year Published: 2024Topics: Biological Sampling & Physiological Measurement, HandlingAnimal Type: Fish, Trout

Citation: Makaras, T., Stankevičiūtė, M. 2024. Effects of handling and surgical implant on juvenile wild trout: Physiological and behavioral impact. Journal of Fish Biology 105(1), 265–278.

The influence of water nitrate concentration combined with elevated temperature on rainbow trout Oncorhynchus mykiss in an experimental aquaponic setup

Intensive recirculating systems are a fast-developing sector of aquaculture. While several warm-water fish have been reared in aquaponics, almost no data are available for cold-water species. The determination of nitrate toxicity thresholds in recirculating aquaculture is crucial. Different pollutants are...

Year Published: 2024Topics: Husbandry & ManagementAnimal Type: Fish, Trout

Citation: Papadopoulos, D. K., Lattos, A., Chatzigeorgiou, I. et al. 2024. The influence of water nitrate concentration combined with elevated temperature on rainbow trout Oncorhynchus mykiss in an experimental aquaponic setup. Fishes 9(2), 74.

Fish intelligence, sentience and ethics

Fish are one of the most highly utilised vertebrate taxa by humans; they are harvested from wild stocks as part of global fishing industries, grown under intensive aquaculture conditions, are the most common pet and are widely used for scientific...

Year Published: 2015Topics: Emotion, Pain, & Sentience, Regulations & Ethical ReviewAnimal Type: Fish, Other Fish, Salmon, Shark & Ray, Tilapia, Trout, Zebrafish

Citation: Brown, C. 2015. Fish intelligence, sentience and ethics. Animal Cognition 18(1), 1–17.

Environmental enrichment improves cognitive flexibility in rainbow trout in a visual discrimination task: First insights

Year Published: 2023Topics: Environmental EnrichmentAnimal Type: Fish, Trout

Citation: Brunet, V., Lafond, T., Kleiber, A. et al. 2023. Environmental enrichment improves cognitive flexibility in rainbow trout in a visual discrimination task: First insights. Frontiers in Veterinary Science 10.

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.