Exactly, actually most fish have better eyesight than us. They can see objects just in front of their eyes as clear as an object 10 feet away. For us object too close to eye gets blurry and objects to far away lose detail.
Instead, to see far-away objects and then close-up ones, fish must move their lenses backwards and forwards. This is called 'accommodation' and is something most species are capable of in order to focus on objects at different distances.
Besides being able to see their prey and recognize their owners, fish also can see a range of colors, since they have color receptors in their eyes. Many species of fish can also see ultraviolet light, which humans can't.
The "barreleye" fish gives a new meaning to "clear-headed" -- members of the central California species Macropinna microstoma have fully transparent skulls filled with a jelly-like fluid that scientists discovered this week allows the fish 360-degree vision.
An image that is far away may seem overhead and frighteningly close to the fish, although it's not confusing to the fish's nimble brain. The fish sees all around itself in clear water—bottom, shoreline, other fish and aquatic plants. It also sees objects and movement, believe it or not, on the far side of rocks.
This is the first time fish have been known to demonstrate this ability. In the UQ study, archerfish were trained to choose a particular human face for a reward and ignore a second non-rewarded face. During testing they were then able to consistently identify the learned face from up to 44 new faces.
Betta fish are known to recognize their owners and get excited to see them, swimming to the front of the tank and dancing around the water in your presence.
Some species have a tapetum, a reflective layer which bounces light that passes through the retina back through it again. This enhances sensitivity in low light conditions, such as nocturnal and deep sea species, by giving photons a second chance to be captured by photoreceptors.
Box jellyfish eat small fish, shrimp, and other crustaceans. While most jellyfish drift along hoping for some tasty morsel to tickle their tentacles, box jellyfish are active hunters. They look for a potential meal with their 24 eyes, then swim over to them to attack.
Eagles have the best eyesight in the animal kingdom and can spot and focus on prey up to 2 miles away. Although eagles weigh only around 10 pounds, eagle eyes are roughly the same size as human eyes.
Most fish species hear only relatively low frequencies. But at the same time, much of the sound in human speech, boat engines, walking, music, and other noises we make aboard contain plenty of low frequencies that fishes are likely to hear.
“It was like they were studying us, not the other way around.” The researchers suggest that with these findings – that wild fish can quickly learn to use specific cues to recognise individual human divers – it stands to reason that many other fish species could recognise certain patterns to identify us.
Also, since most fish do not have eyelids, they cannot close their eyes during this rest. Fish appear to be more alert. View Source than humans are during sleep, which may give them more time to react to potential threats in their environment.
Fish can feel – and there's over 30 years of scientific research to prove it. Between 1990 and 2020, 349 articles documenting sentience in fish were published. Researchers recognised that over 140 species of fish can experience a wide variety of emotions, ranging from altruism to stress.
Overall, a fish's eye is better adapted to see movement and contrast rather than actual detail. You could say that many fish are generally short sighted. Humans and many other animals adjust focus by changing the shape of the lens.
Despite being living creatures, jellyfish don't have brains – or hearts. They do have a nervous system, however, with nerves at the base of their tentacles or a nerve net spread across their bodies. These nerves act as sensory organs that detect touch, temperature and smells.
Larval flounder are born with one eye on each side of their head, like you would see with most fish. But, as they grow, one eye migrates to the other side of the body! This allows the flatfish to masterfully camouflage itself on the ocean floor, for protection against predators!
The scallop, for example, is an animal that lives in the ocean inside a shell. Around the edge of the shell the scallop has 50-100 eyes, each with a tiny structure that looks like a mirror.
People with fish tanks at home will know that when the lights go off at night, the fish become far less active. If you turn a light on in the middle of the night you'll see how still they are. Like people, fish have an internal clock that tells them when to do things like sleep and eat.
Fish primarily see blues and greens, with some species detecting ultraviolet (UV) light. Fish in clear, shallow waters, like trout and salmon, can also perceive reds and oranges. Deep-sea fish, however, may see less color due to low light but are adapted to low-light vision.
In some fishes the gas bladder (sometimes called the swim bladder) aids in hearing by transmitting vibrations to the inner ear. This function is enhanced in many freshwater fishes (such as Carp) by the Weberinan ossicles, a series of small bones that connect the front of the swim bladder to the inner ear.
Jordan says fish evolved the ability to link a certain stimulus to a reward. That's how they might be learning “to associate a particular human that they recognize through visual means with a certain outcome.”
Fish are one of the least intelligent pets, right? Wrong. Fish are actually quite aware of their surroundings and can act excited or sad, much like other pets.
