In order to observe the blood flow of small fish caudal fin, I specially went to the fish market and bought two small fish with less caudal fin pigment, commonly known as glass fish. When I got home, I immediately turned out the used small fish tank and brushed it clean, and then gently poured the small fish into the transparent sky blue fish tank.
At first, these two small fish were very unstable, and they kept rampaging in the fish tank, probably because they didn't adapt to the new environment. After a while, the little fish finally calmed down. Through the glass, I saw that they were so beautiful: crystal clear bodies, small fish heads with bright eyes on both sides, charming blue-green silver shining from their cheeks, and their tails were reddish. I guess the reason why this little fish's tail is red may be because there are blood vessels.
For a long time, I thought it was time to feed the small fish, so I picked a few nematodes with a toothpick and planted them in a fish tank. But little fish don't eat. "Maybe they are not hungry, and maybe someone looks at them and dares not eat." I thought about it, put the fish tank on the windowsill and went to do my homework.
At six o'clock in the evening, I went to see the little fish again. To my surprise, the little fish didn't eat those nematodes. How did this happen? I thought hard and later thought that the small fish didn't eat it because the nematodes were too long and thick. So I found a short and thin nematode and sent it to the mouth of the small fish with a toothpick. Sure enough, the little fish sucked the worm into its stomach. Who knows that the little fish actually spit out the worms again! Isn't that the reason, but that small fish can't eat nematodes at all? I'm getting more and more anxious. I'm afraid the little fish will starve to death, so I feed them with the smallest crumbs that can be seen clearly by the naked eye. The little fish tasted it and spat it out. It seems that they are really hungry. I was even more anxious. Finally, I cut a nematode into small pieces and fed it to the fish. Unexpectedly, it happened to hit the fish and the fish ate it! I kept feeding them until they saw the bug on the toothpick and turned away.
Fish, fish, something will happen to you!
I hope I can help you.