It seems to us that in a large school of fish, all the fish are basically the same length, and there is no difference. But are fish really unable to tell who is in the middle of the school? This is not the case.
< h1 class = "pgc-h-center-line" > fish can tell each companion? </h1>
If you don't look closely, it's true that a lot of fish basically look the same. We sometimes wonder if fish can distinguish between different companions. In fact, not only can they distinguish all their companions, but there is no experiment to prove that fish cannot distinguish between each other. Fish can use one or more of the senses in a developed sensory system to identify and distinguish their companions, or to discover their own companions in other populations. In the case of artificial feeding, some fish are even slightly trained to use their sense of smell directly to distinguish their companions, without the need for a large number of senses. Of course, fish will also recognize different individuals in the fish.
Clean fish are a type of marine fish that they usually set up a cleaning site on a coral reef. Fish can come to this site regularly to enjoy the service of cleaning fish. Cleaning a fish can eat parasites, dead skin, food scraps, and so on. Of course, cleaning fish is not eaten by anyone. They will remember and discern each of its customers. For example, the last time a fish did not come regularly and was absent, then this time its number of parasites may be larger, and the cleaning fish will give priority to cleaning services.
After 10 to 12 days of life, peacock fish will become familiar with new companions and they will establish social hierarchies. If there are two peacock fish fighting, then one is watching. Onlookers will be more aggressive in front of the losing individual, and more obedient in front of the winner. If it hadn't witnessed two peacock fish fighting, it wouldn't have had that preference. The clever peacock fish knows when to use higher social status to bully low-ranking peers, and when to obey higher-status individuals, so as to avoid their own suffering.
The identity information of individual fish has other uses. Captive-bred mackerels identify individuals in schools who are less likely to compete for food and are more willing to interact with them. If individuals were separated from previous schools of fish, they would be more likely to join the less efficient group of fish. In the same way, the blue gill sunfish (Guodou) will do the same thing. It turns out that fish are indeed able to distinguish their companions. And you can remember their information, which is equivalent to having a historical record in your hand.
< h1 class= "pgc-h-center-line" > so, can fish distinguish between people? </h1>
Can fish recognize faces? The answer is yes. But it takes longer for fish to distinguish a person's face. After all, fish are companions and can communicate with each other as they wish. Humans are another kind of creature, they can distinguish individuals but for a longer time, and they don't remember all the people who have come to see them or fed them, they can only remember the people who have spent the longest time with themselves and fed them the most times. If you keep the fish in the tank long enough, as long as you get close to the tank, it will start to stir. Thinking against others does not have this effect. The same is true of an orange-spotted snakehead I used to have. It cannot be said that this is a mastery of human nature, it is just a recognition and discernment.
If you also like to raise ornamental fish, you may wish to start pointing out a point of attention, all you need to know about fish farming is here.