The cerebral cortex and limbic system are absent in fish. Cerebral cortex, which is what permits other animals to cry.
No, fishes can't cry and can't produce tears.
It is often thought that fish may lack the limbic system, but in reality, fishes do have a limbic system, but they lack the biological machinery to produce tears.
While we might not be able to read pain on a fish's face, the evidence is increasingly clear that they experience a range of emotions including fear, joy, relaxation and playfulness. We know that fish have receptors to feel pain, experience stress when they are confined and, like us, try to avoid frightening events.
The key to the toadfish's talkativeness is its unusual swim bladder. This gas-filled organ is normally used to keep the animal buoyant, but a nearby muscle can make it resonate and so double as an organ of vocalisation.
It turns out emotional attachment to a partner is not unique to humans or even to mammals. Breakups really suck, even if you're a fish. The scientists started by giving females a chance to express a preference between two males.
Fish can develop an association between something they like, being fed, with the person who feeds them. The more you interact with your betta fish, the more likely they will be to recognize you. It's normal for betta fish to swim to the front of the tank when an owner comes up to it.
According to Balcombe, some fish (though certainly not all) do actually enjoy being touched by humans.
“Fish do feel pain. It's likely different from what humans feel, but it is still a kind of pain.” At the anatomical level, fish have neurons known as nociceptors, which detect potential harm, such as high temperatures, intense pressure, and caustic chemicals.
As well as getting water through osmosis, saltwater fish need to purposefully drink water in order to get enough into their systems. Where their freshwater counterparts direct all of the water that comes into their mouths out through their gills, saltwater fish direct some into their digestive tract.
PUBLIC DOMAIN Fish have a neurochemistry similar to humans and illustrate signs of depression. Recent studies have shown that some species of fish can show symptoms of major depressive disorder.
Can your pet fish recognize your face? A new study says, Yes, it probably can. Researchers studying archerfish found the fish can tell a familiar human face from dozens of new faces with surprising accuracy.
Fish-keepers sometimes see their pets 'glass surfing' – swimming repeatedly up and down the glass of the tank. This could be the aquatic equivalent of the pacing of a captive tiger that's bored from a lack of stimulation. But the fish could also be stressed from an overcrowded or unfamiliar tank.
But for now, as far as scientists understand it, sharks and other fish aren't capable of smiling. That's despite the fact that some really look as if they're smiling.
Yes, fish can hear you talk!
Sounds that are created above water typically do not carry enough force to penetrate the surface tension of the water, so talking on the boat or loud noise may not affect fish as much as your fellow anglers may want you to think. Your voice is unlikely to spook or scare fish away.
First, behavioural responses to sensory stimuli must be distinguished from psychological experiences. Second, the cerebral cortex in humans is fundamental for the awareness of sensory stimuli. Third, fish lack a cerebral cortex or its homologue and hence cannot experience pain or fear.
Your fish are happy and healthy when they: Swim actively throughout the entire tank, not just hanging out or laying at the bottom, floating near the top or hiding behind plants and ornaments. Eat regularly and swim to the surface quickly at feeding time.
While fish do not sleep in the same way that land mammals sleep, most fish do rest. Research shows that fish may reduce their activity and metabolism while remaining alert to danger. Some fish float in place, some wedge themselves into a secure spot in the mud or coral, and some even locate a suitable nest.
Toxins. Agricultural runoff, sewage, surface runoff, chemical spills and hazardous waste spills can all potentially lead to water toxicity and fish kill. Some algae species also produce toxins.
“Fish are more intelligent than they appear. In many areas, such as memory, their cognitive powers match or exceed those of 'higher' vertebrates including non-human primates.” Fish's long-term memories help them keep track of complex social relationships.
In 2008, the studies led to the finding that naked mole rats didn't feel pain when they came into contact with acid and didn't get more sensitive to heat or touch when injured, like we and other mammals do.
Despite differences in brain size and form, fish have been scientifically proven to have memories lasting months, perhaps even years, as well as the ability to recognise and consciously avoid pain and danger, seek out reward, navigate mazes, and even use tools.
Most likely, yes, say animal welfare advocates. Lobsters belong to a family of animals known as decapod crustaceans that also includes crabs, prawns, and crayfish.
Male kissers will occasionally challenge each other; however, the "kissing" itself is never fatal, but the constant bullying can stress the other fish to death. They often do in fact kill other fish by sucking the mucus off their skin as food, which opens the victim fish up to infections.
The same noise level in the air could lead to serious hearing damage over time. And fish have it even worse: since the sound pressure is four times higher under water than it is in the air, a good portion of deaths in public aquarium can be traced back to repeated tapping on the glass.