Fish

Malawi cichlids: A colorful 4th R story

This article describes the successful rehoming of 60 Malawi cichlids from a vivarium at Stanford University to San Diego Zoo and the California Academy of Sciences.

Year Published: 2020Topics: Relocation & TransportAnimal Type: Fish, Other Fish

Citation: Chu, D. 2020. Malawi cichlids: A colorful 4th R story. Laboratory Animal Science Professional 8(3) (May/June), 24-25.

Long-term retention of dummy acoustic transmitters in adult brown trout

A group of 36 1+ age class Salmo trutta were surgically implanted with dummy acoustic tags and monitored for 370 days. In total 13 tags were expelled throughout the experiment with an overall tag loss rate of c. 0.035 tags...

Year Published: 2020Topics: Identification MethodAnimal Type: Fish, Trout

Citation: Kennedy, R. J., Evans, D., Allen, M. 2020. Long-term retention of dummy acoustic transmitters in adult brown trout. Journal of Fish Biology 97(4), 1281–1284.

Noninvasive multielectrode array for brain and spinal cord local field potential recordings from live zebrafish larvae

Zebrafish are an important and expanding experimental system for brain research. We describe a noninvasive electrophysiology technique that can be used in living larvae to measure spontaneous activity in the brain and spinal cord simultaneously. This easy-to-use method uses a...

Year Published: 2020Topics: Biological Sampling & Physiological MeasurementAnimal Type: Fish, Zebrafish

Citation: Tomasello, D. L., Sive, H. 2020. Noninvasive multielectrode array for brain and spinal cord local field potential recordings from live zebrafish larvae. Zebrafish 17(4), 271-277.

Habituation with apparatus and group testing improves assessment of fish preferences

Preference tests are commonly used to assess fish behavior and cognition in several research fields. This study aimed to investigate how fish perform in a preference test involving extended habituation to the apparatus, which was expected to reduce stress. We...

Year Published: 2025Topics: Behavioral & Cognitive TestingAnimal Type: Fish, Other Fish

Citation: Varracchio, C., Paci, F. P., Bertolucci, C. et al. 2025. Habituation with apparatus and group testing improves assessment of fish preferences. Journal of Fish Biology 107(4), 1149–1158.

Interaction with enrichment objects depends on color and increases after feeding in some elasmobranchs but not others

Environmental enrichment is important for the long-term wellbeing of captive organisms and is an understudied topic in aquatic taxa, particularly ectothermic organisms such as elasmobranchs. This study examines how individual elasmobranchs use environmental enrichment objects before and after feeding. The...

Year Published: 2025Topics: Environmental EnrichmentAnimal Type: Fish, Shark & Ray

Citation: Smith, A. B., Landesman, J., Williamson, L. et al. 2025. Interaction with enrichment objects depends on color and increases after feeding in some elasmobranchs but not others. Applied Animal Behaviour Science 292, 106829.

Non-invasive ultrasound measurements for determination of hepato-somatic index in Greenland halibut (Reinhardtius hippoglossoides)

Hepato-somatic index (HSI) is widely used to indicate fish body condition and level of energy reserves related to feeding/physiology and reproduction. HSI is traditionally obtained by dissection and measurement of liver mass versus body mass, but ultrasound technology may provide...

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

Citation: Schilling, J. W., Hussey, N. E., Hedges, K. J. et al. 2025. Non-invasive ultrasound measurements for determination of hepato-somatic index in Greenland halibut (Reinhardtius hippoglossoides). Journal of Fish Biology 107(4), 1313–1322.

Methods of humane killing of laboratory fish: FELASA Working Group recommendations

As commissioned by the Federation of European Laboratory Animal Science Associations, these working group recommendations define the requirements to achieve the humane killing of fish, compare methods of killing, recommend methods of killing depending on context, and detail protocols leading...

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

Citation: Mocho, J.-P., Blasco, J. R., Lundegaard, P. R. et al. 2025. Methods of humane killing of laboratory fish: FELASA Working Group recommendations. Laboratory Animals 59(5), 599–613.

Blue light preconditioning as a novel strategy for reducing transport stress in zebrafish

In recent years, zebrafish have become increasingly important in experimental sciences, with transportation being a critical step in their use. However, the vibrations during transportation often induce stress responses in the fish, impairing their physiological functions and even leading to...

Year Published: 2025Topics: Relocation & TransportAnimal Type: Fish, Zebrafish

Citation: Huo, L., Miao, X., Zhang, X. et al. 2025. Blue light preconditioning as a novel strategy for reducing transport stress in zebrafish. Behavioural Processes 231, 105260.

Premises for digital twins reporting on Atlantic salmon wellbeing

Many species of fish, birds and mammals commonly live in human captivity; Atlantic salmon Salmo salar is one of them. The international legal status of the welfare of captive animals is slowly developing and still requires rigorous specification. For example,...

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

Citation: Giske, J., Dumitru, M. L., Enberg, K. et al. 2025. Premises for digital twins reporting on Atlantic salmon wellbeing. Behavioural Processes 226, 105163.

Preference for complex environments in larval zebrafish

Environmental complexity is increasingly recognized as a critical factor for animal welfare and cognitive development across vertebrates. While adult zebrafish (Danio rerio) show a strong preference for complex environments, little is known about the importance of environmental complexity in larval...

Year Published: 2025Topics: Environmental EnrichmentAnimal Type: Fish, Zebrafish

Citation: Gatto, E., Agrillo, C., Dadda, M. et al. 2025. Preference for complex environments in larval zebrafish. Applied Animal Behaviour Science 292, 106788.