Fish do not feel pain the way humans do. That is the conclusion drawn by an international team of researchers consisting of neurobiologists, behavioral ecologists, and fishery scientists.
On July 13, a revised animal protection went into effect in Germany. But anyone who expects it to contain concrete statements regarding the handling of fish will be disappointed.
The legislator seemingly had already found its answer to the fish issue. Accordingly, “fish are sentient vertebrates who must be protected against cruel acts performed by humans against animals.” Anyone in Germany who, without due cause, kills vertebrates or inflicts severe pain or suffering on them has to face penal consequences as well as severe fines or even prison sentences.
Now, the question of whether or not fish are really able to feel pain or suffer in human terms is once again on the agenda. A final decision would have far-reaching consequences for millions of anglers, aquarists, fish farmers, and fish scientists. To this end, a research team consisting of seven people has examined all significant studies on the subject of fish pain.
During their research, the scientists from Europe, Canada, Australia, and the USA have discovered many deficiencies. These are the authors’ main points of criticism: Fish do not have the neuro-physiological capacity for a conscious awareness of pain. In addition, behavioral reactions by fish to seemingly painful impulses were evaluated according to human criteria and were thus misinterpreted. There is still no final proof that fish can feel pain.
This is how it works for humans
To be able to understand the researchers’ criticism you first have to comprehend how pain perception works for humans. Injuries stimulate what is known as nociceptors. These receptors send electrical signals through nerve-lines and the spinal cord to the cerebral cortex (neocortex).
With full awareness, this is where they are processed into a sensation of pain. However, even severe injuries do not necessarily have to result in an experience of pain. As an emotional state, pain can for example be intensified through engendering fear and it can also be mentally constructed without any tissue damage.
Conversely, any stimulation of the nociceptors can be unconsciously processed without the organism having an experience of pain. This principle is used in cases such as anaesthesia. It is for this reason that pain research distinguishes between a conscious awareness of pain and an unconscious processing of impulses through nociception, the latter of which can also lead to complex hormonal reactions, behavioral responses as well as to learning avoidance reactions. Therefore, nociceptive reactions can never be equated with pain, and are thus, strictly speaking, no prerequisite for pain.
Fish are not comparable to humans in terms of anatomy and physiology
Unlike humans, fish do not possess a neocortex, which is the first indicator of doubt regarding the pain awareness of fish. Furthermore, certain nerve fibres in mammals (known as c-nociceptors) have been shown to be involved in the sensation of intense experiences of pain.
All primitive cartilaginous fish subject to the study, such as sharks and rays, show a complete lack of these fibres and all bony fish – which includes all common types of fish such as carp and trout – very rarely have them. In this respect, the physiological prerequisites for a conscious experience of pain are hardly developed in fish. However, bony fish certainly possess simple nociceptors and they do of course show reactions to injuries and other interventions. But it is not known whether this is perceived as pain.
What does all this mean for those who use fish?
In legal terms, it is forbidden to inflict pain, suffering, or harm on animals without due cause according to §1 of the German Animal Protection Act. However, the criteria for when such acts are punishable is exclusive tied to the animal’s ability to feel pain and suffering in accordance with § 17 of the very same Act.
The new study severely doubts that fish are aware of pain as defined by human terms. Therefore, it should actually no longer constitute a criminal offense if, for example, an angler releases a harvestable fish at his own discretion instead of eating it.
Source: Forschungsverbund Berlin e. V.