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Lucon-Xiccato T, Montalbano G, Bertolucci C. Adaptive phenotypic plasticity induces individual variability along a cognitive trade-off. Proc Biol Sci 2023; 290:20230350. [PMID: 37357854 PMCID: PMC10291716 DOI: 10.1098/rspb.2023.0350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Accepted: 06/02/2023] [Indexed: 06/27/2023] Open
Abstract
Animal species, including humans, display patterns of individual variability in cognition that are difficult to explain. For instance, some individuals perform well in certain cognitive tasks but show difficulties in others. We experimentally analysed the contribution of cognitive plasticity to such variability. Theory suggests that diametrically opposed cognitive phenotypes increase individuals' fitness in environments with different conditions such as resource predictability. Therefore, if selection has generated plasticity that matches individuals' cognitive phenotypes to the environment, this might produce remarkable cognitive variability. We found that guppies, Poecilia reticulata, exposed to an environment with high resource predictability (i.e. food available at the same time and in the same location) developed enhanced learning abilities. Conversely, guppies exposed to an environment with low resource predictability (i.e. food available at a random time and location) developed enhanced cognitive flexibility and inhibitory control. These cognitive differences align along a trade-off between functions that favour the acquisition of regularities such as learning and functions that adjust behaviour to changing conditions (cognitive flexibility and inhibitory control). Therefore, adaptive cognitive plasticity in response to resource predictability (and potentially similar factors) is a key determinant of cognitive individual differences.
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Affiliation(s)
- Tyrone Lucon-Xiccato
- Department of Life Sciences and Biotechnology, University of Ferrara, Via L. Borsari 46, 44121 Ferrara, Italy
| | - Giulia Montalbano
- Department of Life Sciences and Biotechnology, University of Ferrara, Via L. Borsari 46, 44121 Ferrara, Italy
| | - Cristiano Bertolucci
- Department of Life Sciences and Biotechnology, University of Ferrara, Via L. Borsari 46, 44121 Ferrara, Italy
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2
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Torgerson-White L, Sánchez-Suárez W. Looking beyond the Shoal: Fish Welfare as an Individual Attribute. Animals (Basel) 2022; 12:ani12192592. [PMID: 36230333 PMCID: PMC9559274 DOI: 10.3390/ani12192592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 09/20/2022] [Accepted: 09/23/2022] [Indexed: 11/16/2022] Open
Abstract
Simple Summary The fish farming industry is characterized by settings where large numbers of fishes are raised together at high stocking densities, effectively obliterating the individual. Given that animal welfare is an individual attribute that refers to how an animal experiences her world, it follows that ensuring good welfare for the different individuals is difficult in fish farms. In this paper we review evidence supporting the notion that fishes are individuals and fish welfare should thus also be considered at the individual level, examine the ways that animal welfare is assessed in fish farms, evaluate these practices in light of individualized terrestrial animal welfare assessment methods, and make recommendations regarding research that could lead to a better understanding of how to provide each individual fish with good welfare in captivity. Abstract Welfare is an individual attribute. In general, providing captive nonhuman animals with conditions conducive to good welfare is an idea more easily applied when dealing with few individuals. However, this becomes much harder—if not impossible—under farming conditions that may imply high numbers of animals living in large group sizes. Although this is a problem inherent to intensive animal farming, it is possibly best exemplified in fish farming, for these practices often rely on extremely high numbers. In this paper we review evidence supporting the notion that fishes are individuals and fish welfare should thus also be considered at the individual level, examine the current state of welfare assessment in the aquaculture industry, evaluate these practices in light of individualized terrestrial animal welfare assessment methods, and make recommendations regarding research that could lead to a better understanding of how to provide each individual fish with good welfare in captivity.
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Affiliation(s)
- Lauri Torgerson-White
- Department of Research, Farm Sanctuary, Watkins Glen, NY 14891, USA
- Correspondence: (L.T.-W.); (W.S.-S.); Tel.: +1-248-835-4770 (L.T.-W.)
| | - Walter Sánchez-Suárez
- Department of Research, Mercy For Animals, Los Angeles, CA 90046, USA
- Correspondence: (L.T.-W.); (W.S.-S.); Tel.: +1-248-835-4770 (L.T.-W.)
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3
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Wallace KJ, Choudhary KD, Kutty LA, Le DH, Lee MT, Wu K, Hofmann HA. Social ascent changes cognition, behaviour and physiology in a highly social cichlid fish. Philos Trans R Soc Lond B Biol Sci 2022; 377:20200448. [PMID: 35000445 PMCID: PMC8743896 DOI: 10.1098/rstb.2020.0448] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
When an individual ascends in dominance status within their social community, they often undergo a suite of behavioural, physiological and neuromolecular changes. While these changes have been extensively characterized across a number of species, we know much less about the degree to which these changes in turn influence cognitive processes like associative learning, memory and spatial navigation. Here, we assessed male Astatotilapia burtoni, an African cichlid fish known for its dynamic social dominance hierarchies, in a set of cognitive tasks both before and after a community perturbation in which some individuals ascended in dominance status. We assayed steroid hormone (cortisol, testosterone) levels before and after the community experienced a social perturbation. We found that ascending males changed their physiology and novel object recognition preference during the perturbation, and they subsequently differed in social competence from non-ascenders. Additionally, using a principal component analysis we were able to identify specific cognitive and physiological attributes that appear to predispose certain individuals to ascend in social status once a perturbation occurs. These previously undiscovered relationships between social ascent and cognition further emphasize the broad influence of social dominance on animal decision-making. This article is part of the theme issue 'The centennial of the pecking order: current state and future prospects for the study of dominance hierarchies'.
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Affiliation(s)
- Kelly J. Wallace
- Department of Integrative Biology, The University of Texas, Austin, TX 78712, USA
| | - Kavyaa D. Choudhary
- Department of Integrative Biology, The University of Texas, Austin, TX 78712, USA
| | - Layla A. Kutty
- Department of Integrative Biology, The University of Texas, Austin, TX 78712, USA
| | - Don H. Le
- Department of Integrative Biology, The University of Texas, Austin, TX 78712, USA
| | - Matthew T. Lee
- Department of Integrative Biology, The University of Texas, Austin, TX 78712, USA
| | - Karleen Wu
- Department of Integrative Biology, The University of Texas, Austin, TX 78712, USA
| | - Hans A. Hofmann
- Department of Integrative Biology, The University of Texas, Austin, TX 78712, USA,Institute for Neuroscience, The University of Texas, Austin, TX 78712, USA
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4
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Salena MG, Turko AJ, Singh A, Pathak A, Hughes E, Brown C, Balshine S. Understanding fish cognition: a review and appraisal of current practices. Anim Cogn 2021; 24:395-406. [PMID: 33595750 DOI: 10.1007/s10071-021-01488-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 12/24/2020] [Accepted: 02/06/2021] [Indexed: 02/04/2023]
Abstract
With over 30,000 recognized species, fishes exhibit an extraordinary variety of morphological, behavioural, and life-history traits. The field of fish cognition has grown markedly with numerous studies on fish spatial navigation, numeracy, learning, decision-making, and even theory of mind. However, most cognitive research on fishes takes place in a highly controlled laboratory environment and it can therefore be difficult to determine whether findings generalize to the ecology of wild fishes. Here, we summarize four prominent research areas in fish cognition, highlighting some of the recent advances and key findings. Next, we survey the literature, targeting these four areas, and quantify the nearly ubiquitous use of captive-bred individuals and a heavy reliance on lab-based research. We then discuss common practices that occur prior to experimentation and within experiments that could hinder our ability to make more general conclusions about fish cognition, and suggest possible solutions. By complementing ecologically relevant laboratory-based studies with in situ cognitive tests, we will gain further inroads toward unraveling how fishes learn and make decisions about food, mates, and territories.
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Affiliation(s)
- Matthew G Salena
- Department of Psychology, Neuroscience and Behaviour, McMaster University, Hamilton, Ontario, Canada.
| | - Andy J Turko
- Department of Psychology, Neuroscience and Behaviour, McMaster University, Hamilton, Ontario, Canada.,Department of Biology, McMaster University, Hamilton, Ontario, Canada.,Great Lakes Institute for Environmental Research, University of Windsor, Windsor, Ontario, Canada
| | - Angad Singh
- Department of Health Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Avani Pathak
- Department of Psychology, Neuroscience and Behaviour, McMaster University, Hamilton, Ontario, Canada.,Department of Biology, McMaster University, Hamilton, Ontario, Canada
| | - Emily Hughes
- Department of Biology, McMaster University, Hamilton, Ontario, Canada
| | - Culum Brown
- Department of Biological Sciences, Macquarie University, Sydney, Australia
| | - Sigal Balshine
- Department of Psychology, Neuroscience and Behaviour, McMaster University, Hamilton, Ontario, Canada
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5
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Raoult V, Trompf L, Williamson JE, Brown C. Stress profile influences learning approach in a marine fish. PeerJ 2017; 5:e3445. [PMID: 28607840 PMCID: PMC5466811 DOI: 10.7717/peerj.3445] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 05/18/2017] [Indexed: 12/03/2022] Open
Abstract
The spatial learning skills of high and low stress juvenile mulloway (Argyrosomus japonicus) were tested in a dichotomous choice apparatus. Groups of fish were formed based on background blood cortisol levels and required to learn the location of a food reward hidden in one of two compartments. Low stress fish characterised by low background levels of the stress hormone cortisol had higher activity levels and entered both rewarded and unrewarded rooms frequently. Within the first week of exposure, however, their preference for the rewarded room increased, indicative of learning. Fish that had high background levels of cortisol, in contrast, showed low levels of activity but when they chose between the two rooms they chose the rewarded room most often but showed less improvement over time. After 12 days in the apparatus, both low and high stress fish had similar ratios of rewarded vs unrewarded room entrances. Our results suggest that proactive coping styles may increase exposure to novel contexts and thus favour faster learning but at the cost of reduced initial accuracy.
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Affiliation(s)
- Vincent Raoult
- Department of Biological Sciences, Macquarie University, Australia
| | - Larissa Trompf
- Department of Biological Sciences, Macquarie University, Australia
| | | | - Culum Brown
- Department of Biological Sciences, Macquarie University, Australia
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6
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7
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Poursaeid S, Falahatkar B, Van Der Kraak G. Short-term effects of cortisol implantation on blood biochemistry and thyroid hormones in previtellogenic great sturgeon Huso huso. Comp Biochem Physiol A Mol Integr Physiol 2015; 179:197-203. [DOI: 10.1016/j.cbpa.2014.09.039] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Revised: 09/10/2014] [Accepted: 09/26/2014] [Indexed: 10/24/2022]
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8
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Barreto RE, Barbosa-Júnior A, Urbinati EC, Hoffmann A. Cortisol influences the antipredator behavior induced by chemical alarm cues in the Frillfin goby. Horm Behav 2014; 65:394-400. [PMID: 24657662 DOI: 10.1016/j.yhbeh.2014.03.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Revised: 03/14/2014] [Accepted: 03/15/2014] [Indexed: 12/22/2022]
Abstract
We evaluated the effect of increased plasma cortisol levels on fish antipredator behavior induced by conspecific chemical alarm cues. The experimental model for the study was the Frillfin goby Bathygobius soporator. We first confirmed that the alarm substance induces typical defensive antipredator responses in Frillfin gobies and described their alarm substance cells (epidermal 'club' cells). Second, we confirmed that intraperitoneal cortisol implants increase plasma cortisol levels in this species. We then demonstrated that exogenous cortisol administration and subsequent exposure to an alarm substance decreased swimming activity to a greater extent than the activity prompted by either stimulus alone. In addition, cortisol did not abolish the sheltering response to the alarm chemical cue even though it decreased activity. As predators use prey movements to guide their first contact with the prey, a factor that decreases swimming activity clearly increases the probability of survival. Consequently, this observation indicates that cortisol helps improve the antipredator response in fish.
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Affiliation(s)
- Rodrigo Egydio Barreto
- Departamento de Fisiologia, Instituto de Biociências, UNESP - Univ. Estadual Paulista, Caunesp, Campus de Botucatu - Rubião Jr., 18618-970 Botucatu, São Paulo, Brazil.
| | - Augusto Barbosa-Júnior
- Laboratório de Neurofisiologia Comparada, Departamento de Fisiologia, Faculdade de Medicina de Ribeirão Preto, USP, Av. Bandeirantes 3900, Monte Alegre, 14049-900 Ribeirão Preto, São Paulo, Brazil
| | - Elisabeth Criscuolo Urbinati
- Departamento de Morfologia e Fisiologia Animal, Faculdade de Ciências Agrárias e Veterinárias, Caunesp, UNESP - Univ. Estadual Paulista, Via de Acesso Prof. Paulo Donato Castelane, 14884-900 Jaboticabal, São Paulo, Brazil
| | - Anette Hoffmann
- Laboratório de Neurofisiologia Comparada, Departamento de Fisiologia, Faculdade de Medicina de Ribeirão Preto, USP, Av. Bandeirantes 3900, Monte Alegre, 14049-900 Ribeirão Preto, São Paulo, Brazil
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9
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Hamacher-Dang TC, Engler H, Schedlowski M, Wolf OT. Stress enhances the consolidation of extinction memory in a predictive learning task. Front Behav Neurosci 2013; 7:108. [PMID: 23986667 PMCID: PMC3749378 DOI: 10.3389/fnbeh.2013.00108] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2013] [Accepted: 08/03/2013] [Indexed: 11/13/2022] Open
Abstract
Extinction is not always permanent, as indicated by several types of recovery effects, such as the renewal effect, which may occur after a context change and points towards the importance of contextual cues. Strengthening the retrieval of extinction memory is a crucial aim of extinction-based psychotherapeutic treatments of anxiety disorders to prevent relapse. Stress is known to modulate learning and memory, with mostly enhancing effects on memory consolidation. However, whether such a consolidation-enhancing effect of acute stress can also be found for extinction memory has not yet been examined in humans. In this study, we investigated the effect of stress after extinction learning on the retrieval of extinction memory in a predictive learning renewal paradigm. Participants took the part of being the doctor of a fictitious patient and learned to predict whether certain food stimuli were associated with "stomach trouble" in two different restaurants (contexts). On the first day, critical stimuli were associated with stomach trouble in context A (acquisition phase). On the second day, these associations were extinguished in context B. Directly after extinction, participants were either exposed to a stressor (socially evaluated cold pressor test; n = 22) or a control condition (n = 24). On the third day, we tested retrieval of critical associations in contexts A and B. Participants exposed to stress after extinction exhibited a reduced recovery of responding at test in context B, suggesting that stress may context-dependently enhance the consolidation of extinction memory. Furthermore, the increase in cortisol in response to the stressor was negatively correlated with the recovery of responding in context A. Our findings suggest that in parallel to the known effects of stress on the consolidation of episodic memory, stress also enhances the consolidation of extinction memory, which might be relevant for potential applications in extinction-based psychotherapy.
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Affiliation(s)
- Tanja C Hamacher-Dang
- 1Faculty of Psychology, Department of Cognitive Psychology, Institute of Cognitive Neuroscience, Ruhr-University Bochum Bochum, Germany ; 2International Graduate School of Neuroscience, Ruhr University Bochum Bochum, Germany
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10
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Poursaeid S, Falahatkar B, Mojazi Amiri B, Van Der Kraak G. Effects of long-term cortisol treatments on gonadal development, sex steroids levels and ovarian cortisol content in cultured great sturgeon Huso huso. Comp Biochem Physiol A Mol Integr Physiol 2012; 163:111-9. [DOI: 10.1016/j.cbpa.2012.05.202] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2012] [Revised: 05/14/2012] [Accepted: 05/16/2012] [Indexed: 11/29/2022]
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11
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Ellis T, Yildiz HY, López-Olmeda J, Spedicato MT, Tort L, Øverli Ø, Martins CIM. Cortisol and finfish welfare. FISH PHYSIOLOGY AND BIOCHEMISTRY 2012; 38:163-188. [PMID: 22113503 DOI: 10.1007/s10695-011-9568-y] [Citation(s) in RCA: 143] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2010] [Accepted: 10/24/2011] [Indexed: 05/31/2023]
Abstract
Previous reviews of stress, and the stress hormone cortisol, in fish have focussed on physiology, due to interest in impacts on aquaculture production. Here, we discuss cortisol in relation to fish welfare. Cortisol is a readily measured component of the primary (neuroendocrine) stress response and is relevant to fish welfare as it affects physiological and brain functions and modifies behaviour. However, we argue that cortisol has little value if welfare is viewed purely from a functional (or behavioural) perspective-the cortisol response itself is a natural, adaptive response and is not predictive of coping as downstream impacts on function and behaviour are dose-, time- and context-dependent and not predictable. Nevertheless, we argue that welfare should be considered in terms of mental health and feelings, and that stress in relation to welfare should be viewed as psychological, rather than physiological. We contend that cortisol can be used (with caution) as a tractable indicator of how fish perceive (and feel about) their environment, psychological stress and feelings in fish. Cortisol responses are directly triggered by the brain and fish studies do indicate cortisol responses to psychological stressors, i.e., those with no direct physicochemical action. We discuss the practicalities of using cortisol to ask the fish themselves how they feel about husbandry practices and the culture environment. Single time point measurements of cortisol are of little value in assessing the stress level of fish as studies need to account for diurnal and seasonal variations, and environmental and genetic factors. Areas in need of greater clarity for the use of cortisol as an indicator of fish feelings are the separation of (physiological) stress from (psychological) distress, the separation of chronic stress from acclimation, and the interactions between feelings, cortisol, mood and behaviour.
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Affiliation(s)
- Tim Ellis
- Cefas Weymouth Laboratory, Weymouth, Dorset, UK.
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12
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Barcellos LJG, Volpato GL, Barreto RE, Coldebella I, Ferreira D. Chemical communication of handling stress in fish. Physiol Behav 2011; 103:372-5. [PMID: 21402090 DOI: 10.1016/j.physbeh.2011.03.009] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2010] [Revised: 02/07/2011] [Accepted: 03/08/2011] [Indexed: 11/18/2022]
Abstract
We investigated whether juveniles of the nocturnal fish jundiá (Rhamdia quelen) and the diurnal fish Nile tilapia (Oreochromis niloticus) are able to chemically communicate stress to conspecifics. Groups of 8 fish were reared in tanks under recirculated water (water exchanged among all the tanks) for each species. Fish were handled in half of the tanks (stressor fish) and whole-body cortisol concentrations were compared among handled fish, non-handled fish exposed to water from the handled fish, and non-handled control fish held with no water communication. For each treatment cortisol concentrations were determined before exposure to the stressor (basal levels) and after 1, 2, 4, 8, and 24h. Basal levels of cortisol confirmed fish were unstressed in the beginning of the experiment. Cortisol was increased in the stressor fish 1h after handling. Fish receiving water from the stressor fish increased cortisol levels later (2h after the stressor fish were handled). As the isolated control group maintained cortisol levels unchanged throughout the experiment, we concluded that some chemical factor was released by the stressed fish in the water and thus stressed the conspecifics. This pattern was similar for both unrelated species, thus suggesting that this communication might have evolved earlier in fish and reinforcing the biological value of this kind of information.
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Affiliation(s)
- Leonardo José Gil Barcellos
- Universidade de Passo Fundo (UPF), Curso de Medicina Veterinária. Campus I, Bairro São José, Caixa Postal 611, CEP 99001-970, Passo Fundo, RS, Brazil
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13
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Galhardo L, Almeida O, Oliveira RF. Measuring motivation in a cichlid fish: An adaptation of the push-door paradigm. Appl Anim Behav Sci 2011. [DOI: 10.1016/j.applanim.2010.12.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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14
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Galhardo L, Vital J, Oliveira RF. The role of predictability in the stress response of a cichlid fish. Physiol Behav 2010; 102:367-72. [PMID: 21145905 DOI: 10.1016/j.physbeh.2010.11.035] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Revised: 11/24/2010] [Accepted: 11/30/2010] [Indexed: 11/26/2022]
Abstract
In recent years there has been an increasing interest in the cognitive abilities of fish with implications for animal welfare and management of rearing operations. Although it is known that psychological factors can modulate the stress response in mammals, this aspect has seldom been investigated within stress in fish. In this study we investigate whether the perception (appraisal) that fish make of significant environmental events modifies their behavioural and physiological response. For this purpose we have used a predictable vs. unpredictable paradigm for positive (feeding) and negative (confinement) events using the cichlid fish Oreochromis mossambicus as a model species. Results show that there is a differential effect of predictability for the feeding and confinement events. In the confinement experiment, predictability involved more attention to the visual cue and lower cortisol. The feeding event triggered higher levels of anticipatory behaviour and a tendency for higher cortisol in the predictable group. Therefore, predictable negative events reduce the cortisol response. Predictable positive events may elicit an anticipatory response, and when there is a significant delay between the visual cue and the actual occurrence of the event, it may also contain elements that can be interpreted as a stress response. These findings demonstrate that fish can appraise relevant aspects of the environment, with welfare implications for housing, husbandry and experimental procedures.
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Affiliation(s)
- Leonor Galhardo
- Unidade de Investigação em Eco-Etologia, Instituto Superior de Psicologia Aplicada, Rua Jardim do Tabaco, 34, 1149-041 Lisboa, Portugal.
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15
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Hofmann SG, Smits JAJ, Asnaani A, Gutner CA, Otto MW. Cognitive enhancers for anxiety disorders. Pharmacol Biochem Behav 2010; 99:275-84. [PMID: 21134394 DOI: 10.1016/j.pbb.2010.11.020] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2010] [Revised: 11/17/2010] [Accepted: 11/26/2010] [Indexed: 12/25/2022]
Abstract
Cognitive-behavioral therapy is an effective intervention for anxiety disorders. However, a significant number of people do not respond or only show partial response even after an adequate course of the treatment. Recent research has shown that the efficacy of the intervention can be improved by the use of cognitive enhancers that augment the core learning processes of cognitive-behavior therapy. This manuscript provides a review of the current state of cognitive enhancers for the treatment of anxiety disorders.
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Affiliation(s)
- Stefan G Hofmann
- Department of Psychology, Boston University, 648 Beacon Street, 6th Floor, Boston, MA 02215-2002, USA.
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16
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Otto MW, McHugh RK, Kantak KM. Combined Pharmacotherapy and Cognitive-Behavioral Therapy for Anxiety Disorders: Medication Effects, Glucocorticoids, and Attenuated Treatment Outcomes. CLINICAL PSYCHOLOGY-SCIENCE AND PRACTICE 2010; 17:91-103. [PMID: 26855480 PMCID: PMC4743901 DOI: 10.1111/j.1468-2850.2010.01198.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Despite the success of both pharmacologic and cognitive-behavioral interventions for the treatment of anxiety disorders, the combination of these modalities in adults has not resulted in substantial improvements in outcome relative to either strategy alone, raising questions about whether there are interfering effects that attenuate the magnitude of combination treatment benefits. In this article, we introduce an accounting of potential interference effects that expands upon arguments asserting the necessity of arousal for successful fear exposure. Specifically, recent advances in the study of the effects of cortisol on memory--suggesting that glucocorticoids are crucial to the learning of emotional material--have led us to posit that the attenuation of glucocorticoid activity by anxiolytic medications may interfere with extinction learning in exposure-based therapies. Implications for the efficacy of combination treatments for the anxiety disorders are discussed.
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17
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Sánchez JA, López-Olmeda JF, Blanco-Vives B, Sánchez-Vázquez FJ. Effects of feeding schedule on locomotor activity rhythms and stress response in sea bream. Physiol Behav 2009; 98:125-9. [PMID: 19410591 DOI: 10.1016/j.physbeh.2009.04.020] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2008] [Revised: 04/24/2009] [Accepted: 04/27/2009] [Indexed: 10/20/2022]
Abstract
Feeding cycles entrain biological rhythms, which enable animals to anticipate feeding times and so maximize food utilization and welfare. In this article, the effect of mealtime was investigated in two groups of sea bream (Sparus aurata): one group received a single daily meal at random times during the light period (random daytime feeding, RDF), whereas the other group received the meal during the light period but at the same time (scheduled daytime feeding, SDF). All the fish showed diurnal behavior, although the SDF group showed a lower percentage of diurnalism (84.4% vs. 79.5% in RDF and SDF respectively) and developed food anticipatory activity some hours before the mealtime. In addition, the mean daily locomotor activity of the RDF group was significantly higher than that of the SDF group (3132 vs. 2654 counts/day, respectively). Although the mean weight differed between both groups on day 30 (115.7 g and 125.6 g in RDF and SDF respectively), these differences had disappeared by day 60. Plasma cortisol and glucose significantly differed in both groups (cortisol: 71.8 vs. 8.7 ng/ml, glucose: 53.7 vs. 43.8 mg/dl in RDF and SDF, respectively), whereas lactate did not differ significantly. The results obtained suggest that altering the feeding time (scheduled vs. random) affects the behavior and physiology of sea bream, indicating that a single daily feeding cycle (compared to random) is beneficial for fish welfare because they can prepare themselves for the forthcoming feed.
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Affiliation(s)
- J A Sánchez
- Department of Physiology, Faculty of Biology, University of Murcia, 30100 Murcia, Spain.
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18
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Cofiel L, Mattioli R. L-histidine enhances learning in stressed zebrafish. Braz J Med Biol Res 2009; 42:128-34. [DOI: 10.1590/s0100-879x2009000100018] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2008] [Accepted: 01/19/2009] [Indexed: 11/22/2022] Open
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19
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Barreto RE, Volpato GL. Evaluating feeding as unconditioned stimulus for conditioning of an endocrine effect in Nile tilapia. Physiol Behav 2007; 92:867-72. [PMID: 17689574 DOI: 10.1016/j.physbeh.2007.06.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2007] [Revised: 04/03/2007] [Accepted: 06/11/2007] [Indexed: 11/21/2022]
Abstract
This study tested the adequacy of feeding as an unconditioned stimulus (US) to condition an endocrine response (plasma cortisol increase) in the cichlid fish Nile tilapia (Oreochromis niloticus). In a first study, conditioning was confirmed in grouped fish in the only experiment using single-held Nile tilapia. In this test a conditioned stimulus (CS - aeration off) was associated with a stressor (air emersion for 2 min- US). We then assessed whether several events of paired CS-US resulted in a conditioned endocrine response (CR), in this case an increase in plasma cortisol after presentation of the CS only. Before testing feeding as US, the postprandial or social holding condition for feeding effects on cortisol levels was tested. Nile tilapia showed increased cortisol after feeding associated to social context (grouped fish), but not to food only (single-held fish). In a third study, feeding was tested as US in an experiment similar to the first study but an increase in feeding-induced cortisol could not be conditioned. The absence of CR suggests that the stressor affects acquisition of this response, which may be a consequence of stimulus intensity or biological relevance. This study expands the recently reported Pavlovian conditioning paradigm for endocrine response in fish.
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