Shelter use of familiar and unfamiliar groups of juvenile European catfish Silurus glanis

Slavík, Ondřej; Maciak, Matúš; Horký, Pavel

doi:10.1016/j.applanim.2012.09.005

Cited by 22 publications

(19 citation statements)

References 40 publications

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“…Providing shelters in rearing tanks can, for example, enhance the use of the sheltering area in the tank. This should promote the aggregation of groups of familiar fish, spacing them through the physical barriers present in the shelter, thereby reducing competition, aggression and stress levels, as has been shown in wels catfish (Silurus glanis) (Slavík et al, 2012). The introduction of shelters must be carefully evaluated and balanced with fish density and territoriality of the species, as little cover could cause competition and aggressive events leading to a reduction of the welfare level, but on the other hand, a higher number of shelters can increase competition in high-density situations and may also increase stress levels (Boerrigter et al, 2015).…”

Section: Environmental Complexitymentioning

confidence: 99%

Review: Assessing fish welfare in research and aquaculture, with a focus on European directives

Toni

Manciocco

Angiulli

et al. 2019

Animal

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The number of farmed fish in the world has increased considerably. Aquaculture is a growing industry that will in the future provide a large portion of fishery products. Moreover, in recent years, the number of teleost fish used as animal models for scientific research in both biomedical and ecological fields has increased. Therefore, it is increasingly important to implement measures designed to enhance the welfare of these animals. Currently, a number of European rules exist as requirements for the establishment, care and accommodation of fish maintained for human purposes. As far as (teleost) fish are concerned, the fact that the number of extant species is much greater than that of all other vertebrates must be considered. Of further importance is that each species has its own specific physical and chemical requirements. These factors make it difficult to provide generalized recommendations or requirements for all fish species. An adequate knowledge is required of the physiology and ecology of each species bred. This paper integrates and discusses, in a single synthesis, the current issues related to fish welfare, considering that teleosts are target species for both aquaculture and experimental models in biological and biomedical research. We first focus on the practical aspects, which must be considered when assessing fish welfare in both research and aquaculture contexts. Next, we address husbandry and the care of fish housed in research laboratories and aquaculture facilities in relation to their physiological and behavioural requirements, as well as in reference to the suggestions provided by European regulations. Finally, to evaluate precisely which parameters described by Directive 2010/63/EU are reported in scientific papers, we analysed 82 articles published by European researchers in 2014 and 2015. This review found that there is a general lack of information related to the optimal environmental conditions that should be provided for the range of species covered by this directive.

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Section: Environmental Complexitymentioning

confidence: 99%

Review: Assessing fish welfare in research and aquaculture, with a focus on European directives

Toni

Manciocco

Angiulli

et al. 2019

Animal

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“…Added shelters are indeed often utilized by the captive fish, at least in species which typically uses shelters in their natural environment (e.g. Brown et al 1970;Slav ık et al 2012;Santos et al 2013). A study on Atlantic salmon even suggests that the mere presence of a shelter (i.e.…”

Section: Structures As Sheltersmentioning

confidence: 99%

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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“…Added shelters are often utilized by captive fishes [Fig. 3(b)], where the effects, not surprisingly, are most pronounced in species that depend on shelters in their natural environment (Brown et al, 1970;Slavík et al, 2012). Shelters have been shown to reduce stress (as indicated by plasma concentrations of cortisol) in South American catfish Rhamdia quelen (Quoy & Gaimard 1824) (Barcellos et al, 2009) and S. salar (Näslund et al, 2013).…”

Section: Sheltering Behaviourmentioning

confidence: 99%

Environmental effects on behavioural development consequences for fitness of captive‐reared fishes in the wild

Johnsson

Brockmark

Näslund

2014

Journal of Fish Biology

129

127

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Why do captive-reared fishes generally have lower fitness in natural environments than wild conspecifics, even when the hatchery fishes are derived from wild parents from the local population? A thorough understanding of this question is the key to design artificial rearing environments that optimize post-release performance, as well as to recognize the limitations of what can be achieved by modifying hatchery rearing methods. Fishes are generally very plastic in their development and through gene-environment interactions, epigenetic and maternal effects their phenotypes will develop differently depending on their rearing environment. This suggests that there is scope for modifying conventional rearing environments to better prepare fishes for release into the wild. The complexity of the natural environment is impossible to mimic in full-scale rearing facilities. So, in reality, the challenge is to identify key modifications of the artificial rearing environment that are practically and economically feasible and that efficiently promote development towards a more wild-like phenotype. Do such key modifications really exist? Here, attempts to use physical enrichment and density reduction to improve the performance of hatchery fishes are discussed and evaluated. These manipulations show potential to increase the fitness of hatchery fishes released into natural environments, but the success is strongly dependent on adequately adapting methods to species and life stage-specific conditions.

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Shelter use of familiar and unfamiliar groups of juvenile European catfish Silurus glanis

Cited by 22 publications

References 40 publications

Review: Assessing fish welfare in research and aquaculture, with a focus on European directives

Review: Assessing fish welfare in research and aquaculture, with a focus on European directives

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

Environmental effects on behavioural development consequences for fitness of captive‐reared fishes in the wild

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