Trout

Editorial: Fish welfare in aquaculture and research—where are we going?

Rapid technical developments are taking place in aquaculture, and its production is increasing globally every year by more than 4%. Research is the necessary foundation for politics to define reasonable regulations and recommend guidelines for aquaculture, but also the basis...

Year Published: 2025Topics: Rearing & Weaning, Stocking Density, Welfare AssessmentAnimal Type: Fish, Other Fish, Salmon, Trout, Zebrafish

Citation: Pietsch, C. 2025. Editorial: Fish welfare in aquaculture and research—where are we going? Animals 15(16), 2367.

Mental Health and Well-being in Animals

Since the publication of the first edition of this book, professional and public concern for the well-being of animals has continued to increase throughout the world. Advances in research and technologies have yielded an enormous amount of new knowledge about...

Year Published: 2025Topics: Emotion, Pain, & Sentience, Welfare AssessmentAnimal Type: All/General, Baboon, Bird, Capuchin, Cat, Chicken, Chimpanzee, Crocodile & Alligator, Dog, Equine, Fish, Gibbon, Goat, Lemur, Lizard, Macaque, Marmoset, Nonhuman Primate, Other Animal, Other Nonhuman Primate, Owl Monkey, Parrot, Pig, Rabbit, Reptile, Salmon, Sheep, Snake, Squirrel Monkey, Trout, Turtle & Tortoise, Vervet (African Green Monkey)

Citation: McMillan, F. D. (Ed.) 2025. Mental Health and Well-being in Animals (3rd ed.). CAB International, Oxfordshire, UK. 464 p.

An adaptable, user-friendly score sheet to monitor welfare in experimental fish

Fish are increasingly used as experimental animals across research fields. Currently, around a quarter of all experimental animals used are fish. Less than 20% of these are standard model species. Welfare assessments for experimental fish are in their infancy compared...

Year Published: 2025Topics: Welfare AssessmentAnimal Type: Fish, Other Fish, Salmon, Shark & Ray, Tilapia, Trout, Zebrafish

Citation: Flueck-Giraud, M., Schmidt-Posthaus, H., Bergadano, A. et al. 2025. An adaptable, user-friendly score sheet to monitor welfare in experimental fish. Laboratory Animals 59(2), 226–241.

Quantifying the welfare impact of air asphyxia in rainbow trout slaughter for policy and practice (2025)

The effective improvement of animal welfare requires quantitative methods to compare diverse impacts across practices and policies on a common, relatable scale. The Welfare Footprint Framework (WFF) fulfills this need by providing a standardized welfare impact measure: cumulative time in...

Year Published: 2025Topics: EuthanasiaAnimal Type: Fish, Trout

Citation: Schuck-Paim, C., Alonso, W. J., Pereira, P. A. et al. 2025. Quantifying the welfare impact of air asphyxia in rainbow trout slaughter for policy and practice. Scientific Reports 15(1), 19850.

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.