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  1. The time budget of Atlantic salmon (Salmo salar) held in enriched tanks

    Contributor(s):: Nordgreen, J., Bjørge, M. H., Janczak, A. M., Hovland, A. L., Moe, R. O., Ranheim, B., Horsberg, T. E.

    In order to understand the impact of different experimental and husbandry procedures on fish, and ensure that the behavioural and physiological needs of fish used in research are met, it is necessary to have detailed knowledge of their behaviour. This knowledge is largely lacking for Atlantic...

  2. Linking risk taking and the behavioral and metabolic responses to confinement stress in gilthead seabream Sparus aurata

    Contributor(s):: Herrera, Marcelino, Castanheira, Maria Filipa, Conceição, Luis E. C., Martins, Catarina I.

    Risk taking and avoidance responses during confinement have been identified in a variety of species, including fish. In addition, differences in metabolic rate have also been attributed to divergent personalities, coping styles or behavioral types. In this study we disclose for the first time a...

  3. The effect of morphine on changes in behaviour and physiology in intraperitoneally vaccinated Atlantic salmon (Salmo salar)

    Contributor(s):: Nordgreen, Janicke, Bjørge, Mette Helen, Janczak, Andrew M., Poppe, Trygve, Koppang, Erling Olaf, Ranheim, Birgit, Horsberg, Tor Einar

    Granulomatous peritonitis is often induced by intraperitoneal vaccination in fish. Peritonitis is a very painful condition in mammals, but little is known about how fish experience this condition. In a previous experiment we found increased latency to eat and a tendency to decreased swimming...

  4. Aggressiveness and locomotion activity related to hatching time in Matrinxã, Brycon amazonicus (Spix and Agassiz, 1829)

    Contributor(s):: de Souza, Ellen Cristina M., da Silva, Jaquelinne P., Villacorta-Correa, Marle Angélica, Carvalho, Thaís B.

    Since agonistic interaction has been a major obstacle for fish hatchery and represents great economic losses for fish farmers, aggressiveness during the different post-hatching stages of the matrinxã, Brycon amazonicus, is analyzed and compared. Each group of three larvae was observed at six...

  5. Social network analysis of the behavioural interactions that influence the development of fin damage in Atlantic salmon parr (Salmo salar) held at different stocking densities

    Contributor(s):: Cañon Jones, Hernán Alberto, Noble, Chris, Damsgård, Børge, Pearce, Gareth P.

    Social network analysis of behavioural interactions was used to quantify the effect of high (HD, 30kgm−3) and low (LD, 8kgm−3) stocking densities on the frequency and severity of fin damage in Atlantic salmon. Dorsal fin damage (erosion, splits, fin index) was significantly higher in HD compared...

  6. Same-sized fish groups increase aggressive interaction of sex-reversed males Nile tilapia GIFT strain

    Contributor(s):: Boscolo, Camila Nomura Pereira, Morais, Rosana Nogueira, Gonçalves-de-Freitas, Eliane

    Animals with similar fighting ability can fight harder and longer than animals in asymmetric contests. Thus, the selection of fish by size similarity in husbandry might increase aggressive interactions, and lead to social instability in socially organized fish. We tested the hypothesis that...

  7. Preference for structured environment in zebrafish (Danio rerio) and checker barbs (Puntius oligolepis)

    Contributor(s):: Kistler, Claudia, Hegglin, Daniel, Würbel, Hanno, König, Barbara

    Information about the welfare and husbandry of pet and laboratory fish is scarce although millions of fish are sold in pet shops and used in laboratory research every year. Inadequate housing conditions can cause behavioural problems also in fish since they are complex animals with sophisticated...

  8. Measuring motivation in a cichlid fish: An adaptation of the push-door paradigm

    Contributor(s):: Galhardo, Leonor, Almeida, Olinda, Oliveira, Rui F.

    Recent behavioural, cognitive and neurophysiological studies strongly suggest that fish are capable of psychological experiences. Therefore, identifying needs from the animals’ point of view is likely to be one of the best approaches to understand their welfare. Motivational tests, as a measure...

  9. Investigating the influence of predictable and unpredictable feed delivery schedules upon the behaviour and welfare of Atlantic salmon parr (Salmo salar) using social network analysis and fin damage

    Contributor(s):: Cañon Jones, Hernán Alberto, Noble, Chris, Damsgård, Børge, Pearce, Gareth P.

    Social network analysis was utilised to quantify the effect of short-term predictable (PD) and unpredictable (UD) feed delivery schedules of 10 days on behavioural interactions and the frequency and severity of fin damage in Atlantic salmon. Fin damage was only observed on the dorsal fin and its...

  10. The efficacy of three types of analgesic drugs in reducing pain in the rainbow trout, Oncorhynchus mykiss

    Contributor(s):: Mettam, Jessica J., Oulton, Lois J., McCrohan, Catherine R., Sneddon, Lynne U.

    Recent research has shown the possibility of pain perception in fish; therefore, the use of analgesia or “painkillers” should be considered for invasive procedures. However, there is relatively little information on the effectiveness of analgesic drugs nor on the appropriate dose for fish. This...

  11. Dominance and growth of Diplodus sargus (Pisces: Sparidae) in small captive groups

    Contributor(s):: Gonçalves, Ana Ribeiro, de Sousa, Liliana Carvalho, Almada, Vitor Carvalho

    The dominance hierarchies and the growth rate of the commercially important fish Diplodus sargus were assessed in this study. Specifically, we tested the hypothesis that, if stable dominance orders were established, dominant fish would grow faster and show better condition factors than losers at...

  12. Observing Live Fish Improves Perceptions of Mood, Relaxation and Anxiety, But Does Not Consistently Alter Heart Rate or Heart Rate Variability

    Contributor(s):: Gee, N. R., Reed, T., Whiting, A., Friedmann, E., Snellgrove, D., Sloman, K. A.

  13. Effects of food quantity and distribution on aggressive behaviour of gilthead seabream and European seabass

    Contributor(s):: Oikonomidou, Eleni, Batzina, Alkisti, Karakatsouli, Nafsika

    In intensive aquaculture, aggression among fish creates a disturbed social environment and leads to serious implications. Food is a resource of great importance for fish and its acquisition is an important enough reason for increased competition. Gilthead seabream Sparus aurata and European...

  14. Effects of familiarity on individual growth and feeding behaviour of European seabass Dicentrarchus labrax

    Contributor(s):: Batzina, Alkisti, Drossos, Ioannis-Panagiotis, Karakatsouli, Nafsika

    Available literature indicates that fish are able to recognize familiar conspecifics and that familiarity may offer important benefits (e.g. more stable social environment, improved foraging behavior, growth, survival). In the practice of intensive rearing of European seabass Dicentrarchus labrax...

  15. A novel emotional and cognitive approach to welfare phenotyping in rainbow trout exposed to poor water quality

    Contributor(s):: Colson, V., Mure, A., Valotaire, C., Le Calvez, J. M., Goardon, L., Labbé, L., Leguen, I., Prunet, P.

    Recent scientific evidence for fish sentience has stressed the need for novel sentience-based detection tools of fish welfare impairment in commercial farms. In order to mimic a well-characterised stress situation, rainbow trout (Oncorhynchus mykiss) were exposed to poor water quality (hypoxia...

  16. Is personality of young fish consistent through different behavioural tests?

    Contributor(s):: Colchen, Tatiana, Faux, Elodie, Teletchea, Fabrice, Pasquet, Alain

    Most studies carried out on personality recognized that personality is defined by behavioural traits consistent through time and/or contexts. In fish, most studies on personality were performed either on juveniles (aged between 6months and 1year) or adults, but very few focused on the early life...

  17. Exploring the efficacy of immersion analgesics in zebrafish using an integrative approach

    Contributor(s):: Schroeder, Paul G., Sneddon, Lynne U.

    Home Office guidelines recommend the use of analgesics for all protected species, including fish during scientific procedures likely to result in pain, suffering, distress and lasting harm. In larger fish species some drugs have shown efficacy in terms of perioperative analgesia when administered...

  18. Effects of culture densities on feed demand, behavioural tests and on the hepatic and cerebral oxidative status in tilapia (Oreochromis sp.)

    Contributor(s):: Sánchez-Muros, María J., Sánchez, Belén, Barroso, Fernando G., García-Mesa, Sergio, Rufino-Palomares, Eva E., Lupiáñez, José A., Sanz, Ana

    The present study examines whether fish density affects behavioural tests, feed demand, and different parameters indicative of the oxidative status of the liver and brain of Orechromis sp. to identify welfare indicators for fish culturing. The fish were maintained at two commercial densities (5.6...

  19. Cannibalism management of jundiá fry, Rhamdia quelen: Behavior in heterogeneous batches fed on food with different particle sizes

    Contributor(s):: Costenaro-Ferreira, Cristiano, Oliveira, Rodrigo R. B., Oliveira, Paulo L. S., Hartmann, Gustavo J., Hammes, Fernanda B., Pouey, Juvêncio L. O. F., Piedras, Sérgio R. N.

    Fish reared in heterogeneous batches and fed on food with a very small particle size can practice cannibalism, because it is energetically more feasible. Jundiá is an omnivorous fish that exhibits heterogeneous growth and high cannibalism rate (CR) in the early stages of its life. Thus, to...

  20. The behavioural effects of supplementing diets with synthetic and naturally sourced astaxanthin in an ornamental fish (Puntius titteya)

    Contributor(s):: Eaton, Lewis, Clezy, Kristian, Snellgrove, Donna, Sloman, Katherine

    Carotenoids are routinely incorporated into ornamental fish diets with the aim of enhancing companion fish colouration which may concomitantly affect fish behaviour. Previously, colour enhancement has typically been achieved using synthetic carotenoids, however, there is now growing public demand...