Why aren t there any big animals in the lakes of the planet?

Because two conditions cannot be met: enough living space and food. First of all, it also depends on how to define "large".

In our lives, especially in the south, if you walk past a two-meter-tall girl, then all people are estimated to turn back, because ordinary people with a height of one meter eight can be a model, and it is conceivable that there are too few girls of two meters, so this two-meter girl can also be regarded as a "giant" among girls, and if "large" is similar to a whale in the ocean, then there can be no large animals in the lake.

The living space is too small to live a normal life. First of all, all the lakes on the earth add up to only the total area of the earth, and the ocean occupies the vast majority of the earth's area, which is one of them. Secondly, once the lake is formed, it will be deposited on the bottom of the lake due to the death of various organisms inside, and the sediment brought by the external rivers into the lake, the lake will become smaller and smaller until it disappears.

Then some people asked, the lake area has become smaller, so can humans remove the silt? Lakes with human intervention must not have large organisms, because in order to ensure safety, or to ensure consumption, humans also catch large animals, and these animals are also difficult to appear in places where people are often occupied.

The food supply is too small to guarantee the amount of food. In the lake, most of them are some freshwater fish and shrimp, duckweed, plants, etc., these animals and plants are few, in fact, it is difficult to ensure the survival of other predators. To make a comparison, in the ocean, a blue whale will eat a ton of krill a day, while in the ocean, there cannot be only one blue whale, because this does not guarantee reproduction, and it must be a population that needs to eat several krill per day.

Can a lake, small in size and with little food, feed so many fish and animals for a large animal population?

Personally, I think it is too difficult for large animals to exist in the lake. In fact, it is not impossible to talk about relatively large animals. Take fish as an example, the fish we usually eat, four or five catties can already be eaten by a family, and in the lake, human beings can fish out a large fish weighing 50 catties for a long time, which is also a relatively large animal.

Because there are no conditions, large animals need to have a lot of food every day, which is not at all basic.

Because the area of the lake is too small compared to the ocean, many large fish live in groups, and the small lake cannot accommodate them to live normally.

Because the lake is not suitable for too large animals, the lake is not as rich in food as the ocean, and the area is not as large as the ocean. So there will be no very large animals, and if there are large animals, the food chain will be out of balance.

Do Baikal seals count? Do some big fish count?