Structural enrichment reduces aggression in<i>Tilapia rendalli</i>

Torrezani, Camila Sobral; Pinho-Neto, Cândido Ferreira; Miyai, Caio Akira; Sanches, Fábio Henrique Carretero; Barreto, Rodrigo Egydio

doi:10.1080/10236244.2013.805053

Cited by 29 publications

(19 citation statements)

References 37 publications

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“…In redbreast tilapia Tilapia rendalli (Cichlidae), the latency to initiate aggressive interactions was decreased in structured environments but the number of attacks was also reduced (Torrezani et al . ). This suggests that structures can be considered to be defendable resources, but when the subordinate is not intruding into the defended area anymore, the conflict settles.…”

Section: Effects Of Structural Enrichmentmentioning

confidence: 97%

“…As an example, when comparing two levels of structural complexity, Barley and Coleman (2010) found that convict cichlids Amatitlania nigrofasciata (Cichlidae) were less aggressive when more structures were available. In redbreast tilapia Tilapia rendalli (Cichlidae), the latency to initiate aggressive interactions was decreased in structured environments but the number of attacks was also reduced (Torrezani et al 2013). This suggests that structures can be considered to be defendable resources, but when the subordinate is not intruding into the defended area anymore, the conflict settles.…”

Section: Structures For the Reduction Of Aggressionmentioning

confidence: 99%

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Environmental enrichment for fish in captive environments: effects of physical structures and substrates

2014

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Structural environmental enrichment, that is, a deliberate addition of physical complexity to the rearing environment, is sometimes utilized to reduce the expression of the undesirable traits that fish develop in captivity. Increasing demands and regulations regarding usage of enrichment to promote fish welfare also make investigations on the effects of enrichment important. Here, we sythesize the current state‐of‐the‐art knowledge about the effects of structural environmental enrichment for fish in captive environments. We find that enrichment can affect several aspects of the biology of captive fish, for example, aggression, stress, energy expenditure, injury and disease susceptibility. Importantly, these effects are often varying in direction and magnitude, and it is clear that just addition of structure is not a solution to all problems in fish rearing. Each species and life stage needs special consideration with respect to its natural history and preferences. A multitude of different enrichment types has been investigated and many studies investigate several enrichment components at the same time, making comparisons among studies difficult. To the present date, the majority of efforts have been directed to investigate salmonid fish in stock‐fish hatcheries and cichlids from a basic research perspective. Some contexts are under‐studied with respect to environmental enrichment, for instance effects on results in basic research and welfare effects in display aquaria. There are many research opportunities left within this field. However, future studies could utilize experimental designs which make it possible to discriminate between effects of different environmental manipulations to a higher degree than what has been performed to this date.

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Section: Effects Of Structural Enrichmentmentioning

confidence: 97%

Section: Structures For the Reduction Of Aggressionmentioning

confidence: 99%

Environmental enrichment for fish in captive environments: effects of physical structures and substrates

2014

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“…Some studies with fish had already shown that environmental enrichment can reduce the behavioral deficit in poor artificial environments [71][72][73]. It was also demonstrated that enrichment decreases aggression rates between individuals in zebra fish (Danio rerio) [74], in the convict cichlid (Archocentrus nigrofasciatus, redescribed as Amatitlania nigrofasciata) [75], in the pearl cichlid (Geophagus brasiliensis) [76], and in the redbreast tilapia (Tilapia rendalli) [77]. These authors discuss that an enriched and more complex environment may decrease the probability of encounters between animals, by reducing the visibility between opponents or limiting the boundaries of small territories in the environment, leading to a decrease in aggressive interactions in these species.…”

Section: Environmental Enrichmentmentioning

confidence: 99%

Social Behavior and Welfare in Nile Tilapia

Gonçalves-de-Freitas

Bolognesi

Gauy

et al. 2019

Fishes

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Fish social behavior can be affected by artificial environments, particularly by factors that act upon species that show aggressive behavior to set social rank hierarchy. Although aggressive interactions are part of the natural behavior in fish, if constant and intense, such interactions can cause severe body injuries, increase energy expenditure, and lead the animals to suffer from social stress. The immediate consequence of these factors is a reduced welfare in social fish species. In this paper, we consider the factors that impact on the social behavior and welfare of Nile tilapia, an African cichlid fish widely used both in fish farms and in research; this species is frequently used as a model for physiology and behavior research. This is a polygynous species whose males interact aggressively, establishing a territorial based hierarchy, where a dominant male and several subordinate males arise. When social stability is shrunk, the negative effects of prolonged fighting emerge. In this paper, we summarized how some of the common practices in aquaculture, such as classifying individuals by matching their sizes, water renewal, stock density, and environment lighting affect Nile tilapia social aggressive interactions and, in turn, impact on its welfare. We also discuss some ways to decrease the effects of aggressive interactions in Nile tilapia, such as environment color and body tactile stimulation.

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“…Frequently, environmental enrichment is divided between social enrichment (typically provision of companions) and structuralphysical enrichment (typically an increase in environmental complexity). The latter can improve physiological and psychological well-being of captive fish by reducing stress (Näslund et al, 2013), reducing aggression (Torrezani et al, 2013) and even improving cognitive performance and neural development (Ebbesson & Braithwaite, 2012;Kotrschal & Taborsky, 2010;Spence et al, 2011;Strand et al, 2010).…”

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confidence: 99%

Shade as enrichment: testing preferences for shelter in two model fish species

Jones

Spence

Jones

et al. 2019

Journal of Fish Biology

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We compared preferences shown by zebrafish Danio rerio and three‐spined stickleback Gasterosteus aculeatus for shelter provided by above‐tank shade and artificial plants. Zebrafish showed no preference for either shelter, whereas sticklebacks showed a preference for both shelter types over open areas and for shade over plants. Our results suggest shade may be used as enrichment for captive fish and re‐emphasise the importance of species‐specific welfare considerations.

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Structural enrichment reduces aggression inTilapia rendalli

Cited by 29 publications

References 37 publications

Environmental enrichment for fish in captive environments: effects of physical structures and substrates

Environmental enrichment for fish in captive environments: effects of physical structures and substrates

Social Behavior and Welfare in Nile Tilapia

Shade as enrichment: testing preferences for shelter in two model fish species

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