Sensory systems in fish

Last updated

Most fish possess highly developed sense organs. Nearly all daylight fish have color vision that is at least as good as a human's (see vision in fish). Many fish also have chemoreceptors that are responsible for extraordinary senses of taste and smell. Although they have ears, many fish may not hear very well. Most fish have sensitive receptors that form the lateral line system, which detects gentle currents and vibrations, and senses the motion of nearby fish and prey. [1] Sharks can sense frequencies in the range of 25 to 50  Hz through their lateral line. [2]

Contents

Fish orient themselves using landmarks and may use mental maps based on multiple landmarks or symbols. Fish behavior in mazes reveals that they possess spatial memory and visual discrimination. [3]

Vision

Diagrammatic vertical section through the eye of teleost fish. Fish have a refractive index gradient within the lens which compensates for spherical aberration. Unlike humans, most fish adjust focus by moving the lens closer or further from the retina. Teleosts do so by contracting the retractor lentis muscle. Bony fish eye multilang.svg
Diagrammatic vertical section through the eye of teleost fish. Fish have a refractive index gradient within the lens which compensates for spherical aberration. Unlike humans, most fish adjust focus by moving the lens closer or further from the retina. Teleosts do so by contracting the retractor lentis muscle.

Vision is an important sensory system for most species of fish. Fish eyes are similar to those of terrestrial vertebrates like birds and mammals, but have a more spherical lens. Their retinas generally have both rod cells and cone cells (for scotopic and photopic vision), and most species have colour vision. Some fish can see ultraviolet and some can see polarized light. Amongst jawless fish, the lamprey has well-developed eyes, while the hagfish has only primitive eyespots. [6] Fish vision shows adaptation to their visual environment, for example deep sea fishes have eyes suited to the dark environment.

Fish and other aquatic animals live in a different light environment than terrestrial species. Water absorbs light so that with increasing depth the amount of light available decreases quickly. The optic properties of water also lead to different wavelengths of light being absorbed to different degrees, for example light of long wavelengths (e.g. red, orange) is absorbed quite quickly compared to light of short wavelengths (blue, violet), though ultraviolet light (even shorter wavelength than blue) is absorbed quite quickly as well. [5] Besides these universal qualities of water, different bodies of water may absorb light of different wavelengths because of salts and other chemicals in the water.

Hearing, vibration, and the lateral line

Hearing is an important sensory system for most species of fish. For example, in the family Batrachoididae, males use their swim bladders to make advertisement calls which females use to localize males. Hearing threshold and the ability to localize sound sources are reduced underwater, in which the speed of sound is faster than in air. Underwater hearing is by bone conduction, and localization of sound appears to depend on differences in amplitude detected by bone conduction. [7] As such, aquatic animals such as fish have a more specialized hearing apparatus that is effective underwater. [8]

Fish can sense sound through their lateral lines and their otoliths (ears). Some fishes, such as some species of carp and herring, hear through their swim bladders. [9]

Hearing is well-developed in carp, which have the Weberian organ, three specialized vertebral processes that transfer vibrations in the swim bladder to the inner ear.

Although it is hard to test sharks' hearing, they may have a sharp sense of hearing and can possibly hear prey many miles away. [10] A small opening on each side of their heads (not the spiracle) leads directly into the inner ear through a thin channel.[ citation needed ]

The lateral line shows a similar arrangement, and is open to the environment via a series of openings called lateral line pores. This is a reminder of the common origin of these two vibration- and sound-detecting organs that are grouped together as the acoustico-lateralis system. In bony fish and tetrapods the external opening into the inner ear has been lost.[ citation needed ]

Current detection

A three-spined stickleback with stained neuromasts Gasterosteus aculeatus with stained neuromasts.png
A three-spined stickleback with stained neuromasts

The lateral line in fish and aquatic forms of amphibians is a detection system of water currents, consisting mostly of vortices. The lateral line is also sensitive to low-frequency vibrations. It is used primarily for navigation, hunting, and schooling. The mechanoreceptors are hair cells, the same mechanoreceptors for vestibular sense and hearing. Hair cells in fish are used to detect water movements around their bodies. These hair cells are embedded in a jelly-like protrusion called cupula. The hair cells therefore can not be seen and do not appear on the surface of skin. The receptors of the electrical sense are modified hair cells of the lateral line system.

Fish and some aquatic amphibians detect hydrodynamic stimuli via a lateral line. This system consists of an array of sensors called neuromasts along the length of the fish's body. [11] Neuromasts can be free-standing (superficial neuromasts) or within fluid-filled canals (canal neuromasts). The sensory cells within neuromasts are polarized hair cells contained within a gelatinous cupula. [12] The cupula, and the stereocilia which are the "hairs" of hair cells, are moved by a certain amount depending on the movement of the surrounding water. Afferent nerve fibers are excited or inhibited depending on whether the hair cells they arise from are deflected in the preferred or opposite direction. Lateral line neurons form somatotopic maps within the brain informing the fish of amplitude and direction of flow at different points along the body. These maps are located in the medial octavolateral nucleus (MON) of the medulla and in higher areas such as the torus semicircularis. [13]

Pressure detection

Pressure detection uses the organ of Weber, a system consisting of three appendages of vertebrae transferring changes in shape of the gas bladder to the middle ear. It can be used to regulate the buoyancy of the fish. Fish like the weather fish and other loaches are also known to respond to low pressure areas but they lack a swim bladder.

Chemoreception (smelling)

The shape of the hammerhead shark's head may enhance olfaction by spacing the nostrils further apart. Hammerhead shark.jpg
The shape of the hammerhead shark's head may enhance olfaction by spacing the nostrils further apart.

The aquatic equivalent to smelling in air is tasting in water. Many larger catfish have chemoreceptors across their entire bodies, which means they "taste" anything they touch and "smell" any chemicals in the water. "In catfish, gustation plays a primary role in the orientation and location of food". [14]

Salmon have a strong sense of smell. Speculation about whether odours provide homing cues, go back to the 19th century. [15] In 1951, Hasler hypothesised that, once in vicinity of the estuary or entrance to its birth river, salmon may use chemical cues which they can smell, and which are unique to their natal stream, as a mechanism to home onto the entrance of the stream. [16] In 1978, Hasler and his students convincingly showed that the way salmon locate their home rivers with such precision was indeed because they could recognise its characteristic smell. They further demonstrated that the smell of their river becomes imprinted in salmon when they transform into smolts, just before they migrate out to sea. [17] [18] [19] Homecoming salmon can also recognise characteristic smells in tributary streams as they move up the main river. They may also be sensitive to characteristic pheromones given off by juvenile conspecifics. There is evidence that they can "discriminate between two populations of their own species". [17] [20]

Sharks have keen olfactory senses, located in the short duct (which is not fused, unlike bony fish) between the anterior and posterior nasal openings, with some species able to detect as little as one part per million of blood in seawater. [21] Sharks have the ability to determine the direction of a given scent based on the timing of scent detection in each nostril. [22] This is similar to the method mammals use to determine the direction of sound. They are more attracted to the chemicals found in the intestines of many species, and as a result often linger near or in sewage outfalls. Some species, such as nurse sharks, have external barbels that greatly increase their ability to sense prey.

The MHC genes are a group of genes present in many animals and important for the immune system; in general, offspring from parents with differing MHC genes have a stronger immune system. Fish are able to smell some aspect of the MHC genes of potential sex partners and prefer partners with MHC genes different from their own. [23]

Electroreception and magnetoreception

Electromagnetic field receptors (ampullae of Lorenzini) and motion detecting canals in the head of a shark Electroreceptors in a sharks head.svg
Electromagnetic field receptors (ampullae of Lorenzini) and motion detecting canals in the head of a shark
Active electrolocation. Conductive objects concentrate the field and resistive objects spread the field. Active electro.png
Active electrolocation. Conductive objects concentrate the field and resistive objects spread the field.

Electroreception is the ability to detect electric fields or currents. Some fish, such as catfish and sharks, have organs that detect weak electric potentials on the order of millivolts. [24] Other fish, like the South American electric fishes Gymnotiformes, can produce weak electric currents, which they use in navigation and social communication. In sharks, the ampullae of Lorenzini are electroreceptor organs. They number in the hundreds to thousands. Sharks use the ampullae of Lorenzini to detect the electromagnetic fields that all living things produce. [25] This helps sharks (particularly the hammerhead shark) find prey. The shark has the greatest electrical sensitivity of any animal. Sharks find prey hidden in sand by detecting the electric fields they produce. Ocean currents moving in the magnetic field of the Earth also generate electric fields that sharks can use for orientation and possibly navigation. [26] Among teleosts, the electric catfish uses electroreception to navigate through muddy waters. These fish make use of spectral changes and amplitude modulation to determine factors such shape, size, distance, velocity, and conductivity. The abilities of the electric fish to communicate and identify sex, age, and hierarchy within the species are also made possible through electric fields. EF gradients as low as 5nV/cm can be found in some saltwater weakly electric fish. [27] Several basal bony fishes, including the paddlefish (Polyodon spathula), possess electroreceptors. The paddlefish hunts plankton using thousands of tiny passive electroreceptors located on its extended snout, or rostrum. The paddlefish is able to detect electric fields that oscillate at 0.5–20 Hz, and large groups of plankton generate this type of signal. [28] [29]

Magnetoreception is the ability to detect the direction one is facing based on the Earth's magnetic field. In 1988, researchers found iron, in the form of single domain magnetite, in the skulls of sockeye salmon. The quantities present are sufficient for magnetoreception. [30]

Fish navigation

Salmon regularly migrate thousands of miles to and from their breeding grounds. [31]

Salmon spend their early life in rivers, and then swim out to sea where they live their adult lives and gain most of their body mass. After several years wandering huge distances in the ocean where they mature, most surviving salmons return to the same natal rivers to spawn. Usually they return with uncanny precision to the river where they were born: most of them swim up the rivers until they reach the very spawning ground that was their original birthplace. [17]

There are various theories about how this happens. One theory is that there are geomagnetic and chemical cues which the salmon use to guide them back to their birthplace. It is thought that, when they are in the ocean, they use magnetoception related to Earth's magnetic field to orient itself in the ocean and locate the general position of their natal river, and once close to the river, that they use their sense of smell to home in on the river entrance and even their natal spawning ground. [32]

Pain

Hooked sailfish Hooked Sailfish.jpg
Hooked sailfish

Experiments done by William Tavolga provide evidence that fish have pain and fear responses. For instance, in Tavolga's experiments, toadfish grunted when electrically shocked and over time they came to grunt at the mere sight of an electrode. [33]

In 2003, Scottish scientists at the University of Edinburgh and the Roslin Institute concluded that rainbow trout exhibit behaviors often associated with pain in other animals. Bee venom and acetic acid injected into the lips resulted in fish rocking their bodies and rubbing their lips along the sides and floors of their tanks, which the researchers concluded were attempts to relieve pain, similar to what mammals would do. [34] [35] [36] Neurons fired in a pattern resembling human neuronal patterns. [36]

Professor James D. Rose of the University of Wyoming claimed the study was flawed since it did not provide proof that fish possess "conscious awareness, particularly a kind of awareness that is meaningfully like ours". [37] Rose argues that since fish brains are so different from human brains, fish are probably not conscious in the manner humans are, so that reactions similar to human reactions to pain instead have other causes. Rose had published a study a year earlier arguing that fish cannot feel pain because their brains lack a neocortex. [38] However, animal behaviorist Temple Grandin argues that fish could still have consciousness without a neocortex because "different species can use different brain structures and systems to handle the same functions." [36]

Animal welfare advocates raise concerns about the possible suffering of fish caused by angling. Some countries, such as Germany have banned specific types of fishing, and the British RSPCA now prosecutes individuals who are cruel to fish. [39]

See also

Related Research Articles

<span class="mw-page-title-main">Inner ear</span> Innermost part of the vertebrate ear

The inner ear is the innermost part of the vertebrate ear. In vertebrates, the inner ear is mainly responsible for sound detection and balance. In mammals, it consists of the bony labyrinth, a hollow cavity in the temporal bone of the skull with a system of passages comprising two main functional parts:

<span class="mw-page-title-main">Sensory nervous system</span> Part of the nervous system

The sensory nervous system is a part of the nervous system responsible for processing sensory information. A sensory system consists of sensory neurons, neural pathways, and parts of the brain involved in sensory perception and interoception. Commonly recognized sensory systems are those for vision, hearing, touch, taste, smell, balance and visceral sensation. Sense organs are transducers that convert data from the outer physical world to the realm of the mind where people interpret the information, creating their perception of the world around them.

<span class="mw-page-title-main">Lateral line</span> Sensory system in fish

The lateral line, also called the lateral line organ (LLO), is a system of sensory organs found in fish, used to detect movement, vibration, and pressure gradients in the surrounding water. The sensory ability is achieved via modified epithelial cells, known as hair cells, which respond to displacement caused by motion and transduce these signals into electrical impulses via excitatory synapses. Lateral lines play an important role in schooling behavior, predation, and orientation.

Stimulus modality, also called sensory modality, is one aspect of a stimulus or what is perceived after a stimulus. For example, the temperature modality is registered after heat or cold stimulate a receptor. Some sensory modalities include: light, sound, temperature, taste, pressure, and smell. The type and location of the sensory receptor activated by the stimulus plays the primary role in coding the sensation. All sensory modalities work together to heighten stimuli sensation when necessary.

<span class="mw-page-title-main">Sensory neuron</span> Nerve cell that converts environmental stimuli into corresponding internal stimuli

Sensory neurons, also known as afferent neurons, are neurons in the nervous system, that convert a specific type of stimulus, via their receptors, into action potentials or graded receptor potentials. This process is called sensory transduction. The cell bodies of the sensory neurons are located in the dorsal ganglia of the spinal cord.

<span class="mw-page-title-main">Hair cell</span> Auditory sensory receptor nerve cells

Hair cells are the sensory receptors of both the auditory system and the vestibular system in the ears of all vertebrates, and in the lateral line organ of fishes. Through mechanotransduction, hair cells detect movement in their environment.

<span class="mw-page-title-main">Electroreception and electrogenesis</span> Biological electricity-related abilities

Electroreception and electrogenesis are the closely related biological abilities to perceive electrical stimuli and to generate electric fields. Both are used to locate prey; stronger electric discharges are used in a few groups of fishes to stun prey. The capabilities are found almost exclusively in aquatic or amphibious animals, since water is a much better conductor of electricity than air. In passive electrolocation, objects such as prey are detected by sensing the electric fields they create. In active electrolocation, fish generate a weak electric field and sense the different distortions of that field created by objects that conduct or resist electricity. Active electrolocation is practised by two groups of weakly electric fish, the Gymnotiformes (knifefishes) and the Mormyridae (elephantfishes), and by Gymnarchus niloticus, the African knifefish. An electric fish generates an electric field using an electric organ, modified from muscles in its tail. The field is called weak if it is only enough to detect prey, and strong if it is powerful enough to stun or kill. The field may be in brief pulses, as in the elephantfishes, or a continuous wave, as in the knifefishes. Some strongly electric fish, such as the electric eel, locate prey by generating a weak electric field, and then discharge their electric organs strongly to stun the prey; other strongly electric fish, such as the electric ray, electrolocate passively. The stargazers are unique in being strongly electric but not using electrolocation.

<span class="mw-page-title-main">Ampullae of Lorenzini</span> Sensory organs in some fish that detect electrical fields

Ampullae of Lorenzini are electroreceptors, sense organs able to detect electric fields. They form a network of mucus-filled pores in the skin of cartilaginous fish and of basal bony fishes such as reedfish, sturgeon, and lungfish. They are associated with and evolved from the mechanosensory lateral line organs of early vertebrates. Most bony fishes and terrestrial vertebrates have lost their ampullae of Lorenzini.

In medicine and anatomy, the special senses are the senses that have specialized organs devoted to them:

<span class="mw-page-title-main">Fish</span> Gill-bearing non-tetrapod aquatic vertebrates

A fish is an aquatic, gill-bearing animal with a hard skull that lacks limbs with digits. This includes hagfish, lampreys, and both cartilaginous and bony fish. Approximately 95% of living fish species are ray-finned bony fish; around 99% of those are teleosts. As a group, if tetrapods are excluded, fish are paraphyletic and so do not form a taxonomic group.

<i>Supersense</i> British television documentary series

Supersense is a six-part nature documentary television series produced by the BBC Natural History Unit, originally broadcast in the United Kingdom on BBC1 in 1988. The series producer was John Downer and the narrator Andrew Sachs. It used groundbreaking effects and filming techniques to show how animals perceive the world around them. The same production team went on to make the follow-up series Lifesense in 1991 and Supernatural: Unseen Power of Animals in 1999.

<span class="mw-page-title-main">Knollenorgan</span>

A Knollenorgan is an electroreceptor in the skin of weakly electric fish of the family Mormyridae (Elephantfish) from Africa. The structure was first described by Viktor Franz (1921), a German anatomist unaware of its function. They are named after "Knolle", German for "tuberous root" which describes their structure.

Mechanosensation is the transduction of mechanical stimuli into neural signals. Mechanosensation provides the basis for the senses of light touch, hearing, proprioception, and pain. Mechanoreceptors found in the skin, called cutaneous mechanoreceptors, are responsible for the sense of touch. Tiny cells in the inner ear, called hair cells, are responsible for hearing and balance. States of neuropathic pain, such as hyperalgesia and allodynia, are also directly related to mechanosensation. A wide array of elements are involved in the process of mechanosensation, many of which are still not fully understood.

<span class="mw-page-title-main">Sense of smell</span> Sense that detects smells

The sense of smell, or olfaction, is the special sense through which smells are perceived. The sense of smell has many functions, including detecting desirable foods, hazards, and pheromones, and plays a role in taste.

<span class="mw-page-title-main">Hearing</span> Sensory perception of sound by living organisms

Hearing, or auditory perception, is the ability to perceive sounds through an organ, such as an ear, by detecting vibrations as periodic changes in the pressure of a surrounding medium. The academic field concerned with hearing is auditory science.

A sense is a biological system used by an organism for sensation, the process of gathering information about the world through the detection of stimuli. Although in some cultures five human senses were traditionally identified as such, many more are now recognized. Senses used by non-human organisms are even greater in variety and number. During sensation, sense organs collect various stimuli for transduction, meaning transformation into a form that can be understood by the brain. Sensation and perception are fundamental to nearly every aspect of an organism's cognition, behavior and thought.

<span class="mw-page-title-main">Hydrodynamic reception</span> Ability of an organism to sense water movements

In animal physiology, hydrodynamic reception refers to the ability of some animals to sense water movements generated by biotic or abiotic sources. This form of mechanoreception is useful for orientation, hunting, predator avoidance, and schooling. Frequent encounters with conditions of low visibility can prevent vision from being a reliable information source for navigation and sensing objects or organisms in the environment. Sensing water movements is one resolution to this problem.

<span class="mw-page-title-main">Surface wave detection by animals</span>

Surface wave detection by animals is the process by which animals, such as surface-feeding fish are able to sense and localize prey and other objects on the surface of a body of water by analyzing features of the ripples generated by objects' movement at the surface. Features analyzed include waveform properties such as frequency, change in frequency, and amplitude, and the curvature of the wavefront. A number of different species are proficient in surface wave detection, including some aquatic insects and toads, though most research is done on the topminnow/surface killifish Aplocheilus lineatus. The fish and other animals with this ability spend large amounts of time near the water surface, some just to feed and others their entire lives.

<span class="mw-page-title-main">Fish physiology</span> Scientific study of how the component parts of fish function together in the living fish

Fish physiology is the scientific study of how the component parts of fish function together in the living fish. It can be contrasted with fish anatomy, which is the study of the form or morphology of fishes. In practice, fish anatomy and physiology complement each other, the former dealing with the structure of a fish, its organs or component parts and how they are put together, such as might be observed on the dissecting table or under the microscope, and the later dealing with how those components function together in the living fish. For this, at first we need to know about their intestinal morphology.

An Artificial Lateral Line (ALL) is a biomimetic lateral line system. A lateral line is a system of sensory organs in aquatic animals such as fish, that serves to detect movement, vibration, and pressure gradients in their environment. An artificial lateral line is an artificial biomimetic array of distinct mechanosensory transducers that, similarly, permits the formation of a spatial-temporal image of the sources in immediate vicinity based on hydrodynamic signatures; the purpose is to assist in obstacle avoidance and object tracking. The biomimetic lateral line system has the potential to improve navigation in underwater vehicles when vision is partially or fully compromised. Underwater navigation is challenging due to the rapid attenuation of radio frequency and Global Positioning System signals. In addition, ALL systems can overcome some of the drawbacks in traditional localization techniques like SONAR and optical imaging.

References

  1. Orr, James (1999). Fish. Microsoft Encarta 99. ISBN   0-8114-2346-8.
  2. Popper, A.N.; Platt, C. (1993). "Inner ear and lateral line". The Physiology of Fishes (1st ed.). CRC Press.
  3. Journal of Undergraduate Life Sciences. "Appropriate maze methodology to study learning in fish" (PDF). Archived from the original (PDF) on 6 July 2011. Retrieved 28 May 2009.
  4. Land, M. F.; Nilsson, D. (2012). Animal Eyes. Oxford University Press. ISBN   9780199581146.
  5. 1 2 Helfman et al, 2009, pp. 84-87.
  6. N. A. Campbell and J. B. Reece (2005). Biology, Seventh Edition. Benjamin Cummings, San Francisco, California.
  7. Shupak A. Sharoni Z. Yanir Y. Keynan Y. Alfie Y. Halpern P. (January 2005). "Underwater Hearing and Sound Localization with and without an Air Interface". Otology & Neurotology. 26 (1): 127–130. doi:10.1097/00129492-200501000-00023. PMID   15699733. S2CID   26944504.
  8. Graham, Michael (1941). "Sense of Hearing in Fishes". Nature. 147 (3738): 779. Bibcode:1941Natur.147..779G. doi: 10.1038/147779b0 .
  9. B, WILLIAMS C. "Sense of Hearing in Fishes." Nature 147.3731 (n.d.): 543. Print.
  10. Martin, R. Aidan. "Hearing and Vibration Detection" . Retrieved 1 June 2008.
  11. Bleckmann, H, and R Zelick. "Lateral line system of fish." Integrative Zoology 4 (2009): 13-25. doi : 10.1111/j.1749-4877.2008.00131.x.
  12. Herring, Peter. The Biology of the Deep Ocean. New York: Oxford, 2002.
  13. Plachta D T T; Hanke W; Bleckmann H (2003). "A hydrodynamic topographic map in the midbrain of goldfish Carassius auratus". Journal of Experimental Biology. 206 (19): 3479–86. doi: 10.1242/jeb.00582 . PMID   12939378.
  14. Atema, Jelle (1980) "Chemical senses, chemical signals, and feeding behavior in fishes" pp. 57–101. In: Bardach, JE Fish behavior and its use in the capture and culture of fishes', The WorldFish Center, ISBN   978-971-02-0003-0.
  15. Trevanius 1822
  16. Hasler 1951
  17. 1 2 3 Moyle 2004, p.190
  18. Hasler 1978
  19. Dittman 1996
  20. Groot 1986
  21. Martin, R. Aidan. "Smell and Taste". ReefQuest Centre for Shark Research. Retrieved 21 August 2009.
  22. The Function of Bilateral Odor Arrival Time Differences in Olfactory Orientation of Sharks Archived 2012-03-08 at the Wayback Machine , Jayne M. Gardiner, Jelle Atema, Current Biology - 13 July 2010 (Vol. 20, Issue 13, pp. 1187-1191)
  23. Boehm T; Zufall F (February 2006). "MHC peptides and the sensory evaluation of genotype". Trends in Neurosciences. 29 (2): 100–7. doi:10.1016/j.tins.2005.11.006. PMID   16337283. S2CID   15621496.
  24. Albert, J.S., and W.G.R. Crampton. 2005. Electroreception and electrogenesis. pp. 431–472 in The Physiology of Fishes, 3rd Edition. D.H. Evans and J.B. Claiborne (eds.). CRC Press.
  25. Kalmijn AJ (1982). "Electric and magnetic field detection in elasmobranch fishes". Science. 218 (4575): 916–918. Bibcode:1982Sci...218..916K. doi:10.1126/science.7134985. PMID   7134985.
  26. Meyer CG; Holland KN; Papastamatiou YP (2005). "Sharks can detect changes in the geomagnetic field". Journal of the Royal Society, Interface. 2 (2): 129–30. doi:10.1098/rsif.2004.0021. PMC   1578252 . PMID   16849172.
  27. Zimmerman, T., Smith, J., Paradiso, J., Allport, D., & Gershenfeld, N. (1995). Applying Electric Field Sensing to Human-Computer Interfaces. IEEE SIG .
  28. Russell DF; Wilkens LA; Moss F (November 1999). "Use of behavioural stochastic resonance by paddle fish for feeding". Nature. 402 (6759): 291–4. Bibcode:1999Natur.402..291R. doi:10.1038/46279. PMID   10580499. S2CID   4422490.
  29. Montgomery JC, Coombs S, Baker CF (2001) The mechanosensory lateral line system of the hypogean form of Astyanax fasciatus. Env Biol Fish 62:87–96
  30. Quinn 1988
  31. Dingle, Hugh; Drake, V. Alistair (2007). "What is migration?". BioScience. 57 (2): 113–121. doi: 10.1641/B570206 .
  32. Lohmann 2008
  33. Dunayer, Joan, "Fish: Sensitivity Beyond the Captor's Grasp," The Animals' Agenda, July/August 1991, pp. 12–18
  34. Vantressa Brown, "Fish Feel Pain, British Researchers Say," Agence France-Presse, 1 May 2003
  35. Kirby, Alex (30 April 2003). "Fish do feel pain, scientists say". BBC News. Retrieved 4 January 2010.
  36. 1 2 3 Grandin, Temple; Johnson, Catherine (2005). Animals in Translation. New York, New York: Scribner. pp.  183–184. ISBN   0-7432-4769-8.
  37. "Rose, J.D. 2003. A Critique of the paper: "Do fish have nociceptors: Evidence for the evolution of a vertebrate sensory system"" (PDF). Archived from the original (PDF) on 6 October 2009. Retrieved 21 May 2011.
  38. James D. Rose, Do Fish Feel Pain?, 2002. Retrieved 27 September 2007.
  39. Leake, J. (14 March 2004). "Anglers to Face RSPCA Check". The Sunday Times. Archived from the original on 23 September 2015. Retrieved 15 September 2015.

Further references