Stocking Density

Social dynamics and behavior of zoo-housed red-footed tortoises at different housing densities

Within zoos, it is common for animals that are considered solitary to be housed with conspecifics. This may be due to a variety of factors such as spatial constraints within zoos, difficulties associated with transferring animals, breeding goals, and/or other...

Year Published: 2025Topics: Stocking DensityAnimal Type: Reptile, Turtle & Tortoise

Citation: O’Brien, S. L., Diaz, A., Cronin, K. A. 2025. Social dynamics and behavior of zoo-housed red-footed tortoises at different housing densities. Behavioural Processes 231, 105242.

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.

Assessing the welfare of spiny lobsters and true lobsters in aquaria: Biology-informed best-practice guidelines for captive conditions

The welfare of decapod crustaceans held in captivity, whether in aquariums, holding facilities, seafood restaurants, supermarkets, or fishmongers, is attracting growing attention and concern. This review focuses on three species that are commonly found in European commercial environments: the European...

Year Published: 2025Topics: Body Modification/Mutilation, Husbandry & Management, Stocking DensityAnimal Type: Crustacean, Invertebrate

Citation: Fruscella, L., Elwood, R. W., Passantino, A. 2025. Assessing the welfare of spiny lobsters and true lobsters in aquaria: Biology-informed best-practice guidelines for captive conditions. Animals 15(16), 2397.

Personality traits of the territorial crustacean Chinese mitten crab (Eriocheir sinensis): Behavioral adaptations to environmental cues (2025)

Territorial crustaceans exhibit a complex set of personality traits and behavioral characteristics that are critical for their survival, growth, and overall welfare. This study aimed to systematically investigate the interplay between two essential personality traits—boldness and aggression—in Chinese mitten crabs...

Year Published: 2025Topics: Personality, Stocking DensityAnimal Type: Crustacean, Invertebrate

Citation: Fang, P., Sheng, S., Li, Y. et al. 2025. Personality traits of the territorial crustacean Chinese mitten crab (Eriocheir sinensis): Behavioral adaptations to environmental cues. Animals 15(5), 757.

The welfare of farmed Nile tilapia: A review (2025)

Nile tilapia are, by absolute number of individuals, the most farmed species of fish today, yet we know little about how common husbandry practices impact their welfare. Despite their global importance, there is a notable lack of detailed, species-specific welfare...

Year Published: 2025Topics: Handling, Housing, Husbandry & Management, Stocking DensityAnimal Type: Fish, Tilapia

Citation: Emam, W., Lambert, H., Brown, C. 2025. The welfare of farmed Nile tilapia: A review. Frontiers in Veterinary Science 12.

Effects of housing density on anxiety-like behavior of zebrafish in the plus maze with ramp

Population density in experimental animals is a crucial factor in maintaining the wellbeing of the organisms. Inadequate housing conditions can compromise the validity and reliability of research results, making comparisons between studies difficult. In sociable species such as zebrafish (Danio...

Year Published: 2024Topics: Stocking DensityAnimal Type: Fish, Zebrafish

Citation: Pessoa, R., Motta, C., Araujo-Pessoa, E. et al. 2024. Effects of housing density on anxiety-like behavior of zebrafish in the plus maze with ramp. Behavioural Processes 222, 105114.

Husbandry protocols for juvenile loggerhead sea turtles (Caretta caretta) based on stress response to stocking density and dry-dock time

When necessary, sea turtles are held captive for veterinarian care and research purposes. Protocols and basic guidelines have been described for husbandry of sea turtles with veterinarian needs but not considering physiological indicators of animal welfare. Because all sea turtle...

Year Published: 2024Topics: Husbandry & Management, Stocking DensityAnimal Type: Reptile, Turtle & Tortoise

Citation: Usategui-Martín, A., Liria - Loza, A., Valverde, R. A. et al. 2024. Husbandry protocols for juvenile loggerhead sea turtles (Caretta caretta) based on stress response to stocking density and dry-dock time. Journal of Applied Animal Welfare Science 27(3), 589–601.

Effects of housing density on reproductive performance, intracage ammonia, and welfare of mice continuously housed as breeders in standard mouse and rat caging

Maintaining compliance with cage density recommendations in The Guide for the Care and Use of Laboratory Animals precludes continuous trio breeding in standard-sized mouse cages. This study evaluated and compared several parameters of reproductive performance, intracage ammonia concentration, and fecal...

Year Published: 2023Topics: Husbandry & Management, Reproduction, Stocking DensityAnimal Type: Mouse, Rodent

Citation: Cho, E., Walsh, C. A., D'Angelo-Gavrish, N. M. et al. 2023. Effects of housing density on reproductive performance, intracage ammonia, and welfare of mice continuously housed as breeders in standard mouse and rat caging. JAALAS 62(2), 116–122.

Effects of litter size and caging on physical and mental development in rats

As a multidisciplinary field, laboratory animal science promotes or accelerates the emergence of innovative ideas and products. As research has increased, so has the demand for laboratory animals with reliable, standardized characteristics. Thus, the breeding, reproduction, and welfare of laboratory...

Year Published: 2023Topics: Rearing & Weaning, Stocking DensityAnimal Type: Rat, Rodent

Citation: Calisir, M., Yilmaz, O., Kolatan, H. E. et al. 2023. Effects of litter size and caging on physical and mental development in rats. Physiology & Behavior 267, 114200.

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.