Among the many strange questions that aquarists ask is whether aquarium fish can see in the dark. Like many curious observers, fishermen and aquarium owners have always wondered if fish can see in the dark. Anglers wonder if fish can see in the dark because they want to know how best to fish in low light before sunrise and after sunset.
In conclusion, while most fish can see in the dark to some degree, they tend to rely more on their sense of smell and hearing to find food when the lights go out. Fish see well in the dark because their eyesight is much better than humans. Their retinas also pick up low frequency light and make their vision clear.
Some fish, such as mesopelagic adapted eyes, always face upwards and perceive light very well. Fish are also able to refract light and focus it on the retina better than we do, allowing them to take advantage of low light conditions. This means that many fish are able to use the light reflected from the moon and stars to see.
Fish living in the sea see by the light of the stars and the moon reflected in the water. In crystal clear water, fish can see up to 100 feet. Water clarity can also be an important factor in what fish can see. Clear, pristine water can also help your fish see distant objects.
After all, if it were to the advantage of a fish to have multiple ways of seeing in the dark, it would be a fish that lives in water so deep that the light barely reaches it. Although many people think that it is difficult for fish to see in the dark, this is far from the case. In other words, the best fish prefer light to dark because they have poor eyesight that prevents them from seeing objects clearly in the dark.
In the case of a completely dark cycle without additional light, the fish see differently based on their lateral line system rather than their vision. You see, like all animals in the world that are nocturnal and any other way of life, aquarium fish adapt to a period of light followed by a period of darkness, so it is not recommended to leave the light in the aquarium at night, leave yourself alone for 24 hours. 24/7 7. Even if you accidentally leave the lights on at night, the fish may calm down and still fall asleep.
Thus, you may find that your fish sleeps at night after the aquarium lights are turned off. If you turned off all the lights in the aquarium at night and only one dim room light is on, don't worry, as the fish can't see well in the dark. In general, you can fish at night, as what you may perceive as darkness is enough to give the fish enough visibility to feed and move.
All fish have some degree of night vision, although some species, such as walleye, see better in the dark than others. As mentioned, many fish also have good night vision because of their large, round lenses. Many fish can also see UV light, while humans cannot.
Some fish are even able to see ultraviolet and polarized light, which humans cannot see. Fish species are able to see in the dark using the ultraviolet frequencies of light reflected from the surface of the oceans. In addition to being able to see fish prey and recognize its owners, fish can also distinguish between different colors because they have color receptors in their eyes. The use means that most of the fish's eyes are directed upwards rather than to the sides, allowing them to more easily see food silhouetted against light reflecting off the surface of the water.
Now, when someone asks you that you can see fish in the dark, you can tell them that they can only see in a limited range, but they also create their own lights by looking for reflections in the water. Now that you know that fish can see in the dark (somehow) but often use their sense of smell and hearing to find food in the absence of light, let's delve into this topic. However, this adaptation does not occur in an aquarium, so the fish are forced to find food using hearing and smell (instead of sight) in the dark.
In addition to hearing, these fish rely on their sense of smell to navigate deep, dark waters. Fish have excellent peripheral vision, perceive light and dark changes more than color changes, and have special sense organs along the lateral line that detect movement or other fish in the immediate vicinity. They have dense spherical lenses that improve peripheral vision. Human eyes have rods and cones on fish retinas, so we know they can see colors as well as shades of grey, light and dark.
Depending on the fish's lifestyle, they may see better in low-light conditions, such as at the bottom of a muddy lake, or in bright light, such as fish living on sunny coral reefs. The fact that the water is a dimly lit environment means that most fish species have adapted to being less dependent on sight. Now that we have determined that aquarium fish do not see in the dark and instead use neuromasts to detect objects, another pressing question will be whether aquarium fish need darkness and you should leave the aquarium lights on 24 hours a day 7 days a week. a week for the fish to feed and play even at night.