Worse Things Happen at Sea: the Welfare of Wild-Caught Fish
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[ “One of the sayings of the Holy Prophet Muhammad(s) tells us: ‘If you must kill, kill without torture’” (Animals in Islam, 2010) Worse things happen at sea: the welfare of wild-caught fish Summary Report Alison Mood fishcount.org.uk 2010 Acknowledgments Many thanks to Phil Brooke and Heather Pickett for reviewing this document. Phil also helped to devise the strategy presented in this report and wrote the final chapter. About this report This summary report is based on a more detailed and fully-referenced version of the report which is available from fishcount.org.uk. Cover photo credit: OAR/National Undersea Research Program (NURP). National Oceanic and Atmospheric Administration/Dept of Commerce. 1 Contents Section 1: Introduction to fish welfare in commercial fishing 3 1 Introduction 3 2 Fish are sentient beings 4 Section 2: Major fishing methods and their impact on animal welfare 8 3 Introduction to animal welfare aspects of fish capture 8 4 Trawling 9 5 Purse seining 11 6 Gill nets, tangle nets and trammel nets 13 7 Rod & line and hand line fishing 15 8 Trolling 17 9 Pole & line fishing 19 10 Long line fishing 21 11 Trapping 23 12 Harpooning 25 13 Use of live bait fish in fish capture 26 14 Summary of improving welfare during capture & landing 28 Section 3: Welfare of fish after capture 33 15 Processing of fish alive on landing 33 16 Introducing humane slaughter for wild-catch fish 34 Section 4: Reducing welfare impact by reducing numbers 35 17 How many fish are caught each year? 35 18 Reducing suffering by reducing numbers caught 37 Section 5: Towards more humane fishing 40 19 Better welfare improves fish quality 40 20 Key roles for improving welfare of wild-caught fish 41 21 Strategies for improving welfare of wild-caught fish 45 References 47 Worse things happen at sea: the welfare of wild-caught fish 2 Section 1: Introduction to fish welfare in commercial fishing 1 Introduction It is widely accepted that animals killed for food Broom of the University of Cambridge (1999a): should be slaughtered humanely. This means that they are killed in ways that cause immediate loss “at least some aspects of pain as we know it of consciousness which lasts until death (or if not must be felt by fish.” immediate, where the method of inducing unconsciousness does not cause suffering e.g. The suffering of fish in commercial fishing is food grade anaesthetics). therefore a major animal welfare issue. This report proposes measures and strategies for There is increasing concern for the welfare of reducing the suffering in fisheries. farmed fish during rearing, transport and slaughter, and in the last few years some progress has been made here. This report argues that the welfare of commercially-caught wild fish during capture and slaughter also needs to be addressed. Wild-caught fish are captured and killed in a manner entirely inconsistent with the concepts of humane treatment and slaughter, and the severity and duration of suffering are likely to be high. The capture of wild-caught fish may last for several hours or even days. Most are likely to die from being crushed in nets, from suffocation in air or from live dissection. They may be rapidly chilled as they suffocate, a process which may both increase and prolong their distress. The number of wild-catch fish is also very high compared with other species killed for food. The current author has estimated that the number of wild fish caught annually is in the order of 1 trillion i.e. 1,000 billion (see chapter 17). This compares with 3 billion mammals, 57 billion birds and, at a rough estimate, 10-100 billion farmed fish slaughtered each year. In 1980, the UK RSPCA’s Medway report concluded that fish can feel pain and fear. Since then, animal welfare science has become a field in its own right, and the evidence that fish can suffer has grown. As stated by Professor Donald fishcount.org.uk 3 Section 1: Introduction to fish welfare in commercial fishing 2 Fish are sentient beings Pain and fear in fish “Anatomical, pharmacological and behavioural data suggest that affective states of pain, fear and stress are likely to be experienced by fish in similar ways as in tetrapods [amphibians, reptiles, birds and mammals]” (Chandroo et al, 2004) Credit: National Oceanic and Atmospheric Administration/Department of Commerce. Photographer: Mr. Mohammed Al Momany, Aqaba, Jordan Professor John Webster, of the University of “There are some differences in sensory Bristol, defines sentience with (2009): functioning between fish and mammals because fish live in water but the pain system "A sentient animal is one for whom feelings of fish is very similar to that of birds and matter". mammals. Fish have pain receptor cells, nociceptive neuronal pathways, specialized Sentience is about the inner life of an animal, and transmitter substances, electrophysiological a sentient animal has capacity to suffer fear, pain responses to cuts, bruises and electric shocks, or distress as well as a sense of well-being. There behavioural avoidance, learned avoidance of is a growing body of evidence that fish are places where they had unpleasant experiences sentient. and processing systems in the brain which parallel those in birds and mammals. Hence at The learning achievements of a goldfish called least some aspects of pain as we know it must “Comet”, trained by his owner to fetch hoops like a be felt by fish.” dog and many other tricks, received great media interest in 2008. In 2003, the publication of a In the European Union, a scientific panel collection of articles on fish intelligence was commissioned by the EU commission adopted its reported on the BBC news website (BBC News, “General approach to fish welfare and to the 2003) which said that, according to scientists, fish concept of sentience in fish” in 2009 (AHAW, 2009). The AHAW Panel had been asked to “do not deserve their reputation as the dim-wits deliver a Scientific Opinion on the animal welfare of the animal kingdom”. aspects of fish farming. Having examined the research that has been carried out for some Of key importance in animal welfare is the capacity species of fish (a relatively small number of to experience pain, fear and distress. The case for species have been studied), this panel concludes: fish feeling pain is summed up by Professor Donald Broom of the University of Cambridge “The balance of the evidence indicates that (1999a): some fish species have the capacity to experience pain” Worse things happen at sea: the welfare of wild-caught fish 4 Section 1: Introduction to fish welfare in commercial fishing Fish feel pain Herring caught in the crush Credit (above left): Courtesy of United Nations Food and Agriculture “at least some aspects of pain as we know it must be Organization. Photographer: Danilo Cedrone. National Oceanic and felt by fish” (Broom, 1999a) Atmospheric Administration/Department of Commerce. Credit (above): National Oceanic and Atmospheric Administration/ Department of Commerce. Photographer: J. M. Olson. and that Fish have brain structures capable of feeling fear and pain “Responses of fish, of some species and AHAW (2009) discusses the similarities in brain under certain situations, suggest that they are structure between fish and other vertebrates and able to experience fear”. begins by saying that: Some scientists have argued that fish cannot “As vertebrates, fish, birds and mammals suffer. In 2002, Rose published a paper, share a similar general brain structure”. conducted at the behest of the American Fisheries Society, arguing that fish do not feel Like that of other vertebrates, the fish brain pain because they do not have a neocortex and consists of the forebrain (i.e. telencephalon and that their behaviours are reflexes without feeling. diencephalon), midbrain and hindbrain. The fish brain is not identical to the mammalian brain. It is The evidence that fish do in fact have brain smaller and fish do not have the extensive structures capable of feeling pain and fear is cerebral cortex seen in the forebrain of mammals. discussed below. The evidence that fish have a This is a laminated structure which covers the pain system which is telencephalon. It has sometimes been argued that because fish do not possess this laminated • similar to that of other vertebrates (e.g. structure (a “neocortex”), they must therefore be mammals and birds), and that incapable of experiencing pain. However, there is • involves these animals feeling pain good reason to believe that fish do experience pain and fear without this particular structure. is discussed subsequently. It is known that the same brain function can be served by different brain structures in different groups of animals, e.g. cognitive functions in birds and mammals (visual stimuli are processed by fishcount.org.uk 5 Section 1: Introduction to fish welfare in commercial fishing part of the cerebral cortex in mammals but by the animals in scientific research was amended to midbrain optic tectum in birds). Another example include the common octopus. of this is that seen in dolphins, highly intelligent animals whose brain is organized in a AHAW (2009) concludes its discussion on brain fundamentally different way to that of primates. It structure by saying: is also a matter of some debate whether human consciousness is a function of the neotcortex “There is scientific evidence to support the alone, or restricted to any single area of the brain. assumption that some fish species have brain structures potentially capable of experiencing As AHAW states, there is evidence that the fish pain and fear”. forebrain contains within it several brain structures that perform similar functions to those As Professor John Webster argues, since all or associated with pain and fear in higher nearly all the evidence points in the direction of vertebrates.