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Resources (81-100 of 202)

  1. Towards understanding the impacts of the pet food industry on world fish and seafood supplies

    Contributor(s):: Silva, S. S. de, Turchini, G. M.

    The status of wild capture fisheries has induced many fisheries and conservation scientists to express concerns about the concept of using forage fish after reduction to fishmeal and fish oil, as feed for farmed animals, particularly in aquaculture. However, a very large quantity of forage fish...

  2. Sustainable aquaculture: are we getting there? Ethical perspectives on salmon farming. (Special Issue: Animal welfare in a broad perspective. Papers from the Nordic Network of Agriculture and Food Ethics.)

    Contributor(s):: Olesen, I., Myhr, A. I., Rosendal, G. K.

    Aquaculture is the fastest growing animal producing sector in the world and is expected to play an important role in global food supply. Along with this growth, concerns have been raised about the environmental effects of escapees and pollution, fish welfare, and consumer health as well as the...

  3. Fish welfare: a challenge to the feelings-based approach, with implications for recreational fishing

    Contributor(s):: Arlinghaus, R., Cooke, S. J., Schwab, A., Cowx, I. G.

    Fish welfare issues are increasingly appearing on social and political agendas and have recently gained prominence in fisheries literature. By focusing on examples from recreational fishing, this paper challenges some of the previous accounts of fish welfare. Issues of concern encompass: (1) the...

  4. Behavioural responses of captive common dolphins Delphinus delphis to a 'Swim-with-Dolphin' programme

    Contributor(s):: Kyngdon, D. J., Minot, E. O., Stafford, K. J.

    We monitored the effects of a `Swim-with-Dolphin' (SWD) programme on the behaviour of three female common dolphins. They were studied from January 1999 to July 1999 at Marineland, Napier, New Zealand. Before, during and after SWD sessions we recorded: (1) the use of a refuge area, (2) the...

  5. Claw removal and feeding ability in the edible crab, Cancer pagurus : implications for fishery practice

    Contributor(s):: Patterson, L., Dick, J. T. A., Elwood, R. W.

    Feeding ability and motivation were assessed in the edible crab, Cancer pagurus, to investigate how the fishery practice of de-clawing may affect live crabs returned to the sea. Crabs were either induced to autotomise one claw, or were only handled, before they were offered food. Initially,...

  6. Behaviour of juvenile mud crabs Scylla serrata in aquaculture: response to odours of moulting or injured crabs

    Contributor(s):: Wall, D., Paterson, B., Mohan, R.

    Behaviour of juvenile mud crabs, Scylla serrata (70-90 mm carapace width, CW) were observed in response to odours of moulting and injured conspecifics and food (pilchard) under controlled flow conditions using bioassay technique. This study was undertaken to better understand the role that...

  7. Social network analysis of behavioural interactions influencing fin damage development in Atlantic salmon ( Salmo salar ) during feed-restriction

    Contributor(s):: Jones, H. A. C., Hansen, L. A., Noble, C., Damsgard, B., Broom, D. M., Pearce, G. P.

    The role of behavioural interactions in the development of fin damage amongst Atlantic salmon (Salmo salar) undergoing feed-restriction was investigated using social network analysis. Dorsal fin damage, particularly erosion, was seen only in groups subjected to feed-restriction. The amount of...

  8. 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):: Jones, H. A. C., Noble, C., Damsgard, B., Pearce, G. P.

    Social network analysis of behavioural interactions was used to quantify the effect of high (HD, 30 kg m-3) and low (LD, 8 kg m-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...

  9. Behavioural responses to hypoxia provide a non-invasive method for distinguishing between stress coping styles in fish

    Contributor(s):: Laursen, D. C., Olsen, H. L., Ruiz-Gomez, M. de L., Winberg, S., Hoglund, E.

    Two divergent behavioural and physiological response patterns to challenges have been identified in mammals and birds, frequently termed the proactive and reactive coping styles. In recent years, individually distinct coping styles have also been observed in several species of fish. These...

  10. Cannibalism in juvenile blue-swimmer crabs Portunus pelagicus (Linnaeus, 1766): effects of body size, moult stage and refuge availability

    Contributor(s):: Marshall, S., Warburton, K., Paterson, B., Mann, D.

    Factors influencing the rate of cannibalism in juvenile blue-swimmer crabs Portunus pelagicus were investigated under controlled conditions using time-lapse video recordings. This study was undertaken to improve blue-swimmer crab culture and experimentally addressed (1) prey vulnerability (2)...

  11. Consistency of individual variation in feeding behaviour and its relationship with performance traits in Nile tilapia Oreochromis niloticus

    Contributor(s):: Martins, C. I. M., Conceicao, L. E. C., Schrama, J. W.

    Feed intake is commonly used as one of the most important performance indicators in fish. However, very little is known about the behavioural processes involved in ingesting food such as meal duration, feeding frequency and latency to start eating. This study aims at the characterization of...

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

    Contributor(s):: Mettam, J. J., Oulton, L. J., McCrohan, C. R., Sneddon, L. 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...

  13. Exploration behaviour and flight response toward a stimulus in three sea bass strains ( Dicentrarchus labrax L.)

    Contributor(s):: Millot, S., Begout, M. L., Chatain, B.

    Domestication and selection may affect fish behaviour, sometime as soon as at the first generation of domestication. However, knowledge about how both processes impact on fish spatial exploration and swimming activity still is to be improved. The objective of this experiment was (i) to evaluate...

  14. The effects of the acetic acid "pain" test on feeding, swimming, and respiratory responses of rainbow trout ( Oncorhynchus mykiss )

    Contributor(s):: Newby, N. C., Stevens, E. D.

    The acetic acid test is commonly used in conscious mammals to determine nociceptive thresholds and efficacy of analgesics. The purpose of the present study was to examine the response of rainbow trout that were not anaesthetised during the acetic acid test. Rainbow trout (n=31) were trained to...

  15. Assessing the effects of a chronic stressor, stocking density, on welfare indicators of juvenile African catfish, Clarias gariepinus Burchell

    Contributor(s):: Nieuwegiessen, P. G. van de, Boerlage, A. S., Verreth, J. A. J., Schrama, J. W.

    Fish welfare is an area of increasing interest and stocking densities used in commercial aquaculture have been highlighted as a subject of specific welfare concern. The present study assessed how stocking density affects growth performance (final body weight, SGR, FCR), physiological (plasma...

  16. Thermonociception in fish: effects of two different doses of morphine on thermal threshold and post-test behaviour in goldfish ( Carassius auratus )

    Contributor(s):: Nordgreen, J., Garner, J. P., Janczak, A. M., Ranheim, B., Muir, W. M., Horsberg, T. E.

    The question of whether fish can perceive pain is controversial, and pain is a potentially grave threat to fish welfare. To be able to study pain in a species, knowledge of its nociceptive system is necessary. There is therefore a need for standardised, repeatable and quantifiable measures of...

  17. Altered aggression in different sized groups of crayfish supports a dynamic social behaviour model

    Contributor(s):: Patullo, B. W., Baird, H. P., Macmillan, D. L.

    Living in groups with conspecifics can increase an animal's fitness in the wild. A social environment may also be imposed by commercial farming industries. One important measure of competition and group dynamics is the level of aggressive interaction. This can also influence the level of damage...

  18. Behavioural analysis of a nociceptive event in fish: comparisons between three species demonstrate specific responses

    Contributor(s):: Reilly, S. C., Quinn, J. P., Cossins, A. R., Sneddon, L. U.

    Nociception is the sensory mechanism by which potentially harmful stimuli are detected in animals and humans. The behavioural responses to noxious stimulation have been studied in two fish species thus far. However, since species-specific differences are seen in mammals, more species need to be...

  19. Individual differences in cortisol levels and behaviour of Senegalese sole ( Solea senegalensis ) juveniles: evidence for coping styles

    Contributor(s):: Silva, P. I. M., Martins, C. I. M., Engrola, S., Marino, G., Overli, O., Conceicao, L. E. C.

    Individual variation in stress physiology and behaviour has been previously reported in several fish species. As seen in other vertebrates, existence of stress coping styles seems to be reflected by the presence of individual variation. Aggressive behaviour, amongst others, is one of the most...

  20. The evidence for pain in fish: the use of morphine as an analgesic

    Contributor(s):: Sneddon, L. U.

    This paper discusses the evidence for pain perception in fish and presents new data on morphine analgesia in fish. Recent anatomical and electrophysiological studies have demonstrated that fish are capable of nociception, the simple detection of a noxious, potentially painful stimulus and the...