What does the rural proverb "fish in the river, lay hens, sleep in cages and have mistresses" mean?

What does the phrase "fish in the river, hens laying eggs, mistresses sleeping in cages" mean? Let's analyze it below. Kaijiang fish, a specialty of Northeast China, can only be eaten in spring when the ice and snow begin to melt slowly. Because after a long winter, the Songhua River and other basins will be covered with a thick layer of ice. After the spring melts, the water will follow this river, and the fish that live in it, that is, Kaijiang fish. This kind of fish usually appears in half a month, and people who can eat it are absolutely blessed and lucky.

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In the second sentence, the scene of hen laying eggs and chicken laying eggs should be known to everyone and many people have seen it. Laying hens are actually hens that have formed eggs in their bellies but haven't laid them yet. These layers are fresh and generally not important. They don't kill chickens. After all, you can lay eggs if you keep them. Who can kill them for no reason?

In the past, the third sentence was used to describe lazy people, especially those rich children who don't have to go out to work at all and just need to stand at home and ask for money. Because poor farmers need to go down to the farmland to farm early and have no time to sleep. Besides, in order to earn more money, everyone doesn't want to spend time sleeping, and everyone is struggling in the farmland. However, modern people regard sleeping in a cage as a normal thing. There are so many people who have insomnia that they can only sleep in cages in the morning. How can they be poor or rich?

The fourth sentence is the second wife.

I want you to think for yourself and answer.