Why do some fish die after spawning?
Most types of fish do not die after spawning; they can generally reproduce for many generations. However, there are some species, such as the Pacific salmon and the eel, that …
Why are there strange-shaped goldfish?
In city parks, there are often tanks full of goldfish. The colorful goldfish swim slowly, and their graceful demeanor is truly endearing. Goldfish are a precious species. China has a …
Why put some water plants in the goldfish bowl?
People who keep goldfish often put a few water plants in the fish tank. Don’t think that the water plants are merely decorations; they have other uses! When we are …
Why use clean sand to filter water to raise goldfish, but they die?
Keeping goldfish can be both easy and difficult. If you don’t understand what goldfish eat, what kind of water they prefer, and what they are afraid of, you might not …
Why can you tell the age of the fish by looking at the scales?
Fish come in various sizes, and determining their age is not difficult. By simply removing a scale from the fish and examining it closely, you can clearly see its age. …
Why do most fishes have their abdomen upward after death?
When fish are alive, they can maintain a certain position in the water, neither floating to the surface nor sinking to the bottom. This is because most fish have an …
Why can fish see the front, back and above objects at the same time without turning around?
The human eyeball is a very complex visual organ, structured like a miniature camera. When we look at objects around us, light reflected from these objects passes through the cornea …
Why are there no live hair tail and yellow croaker in the market?
Most people have tasted the delicious ribbonfish and croaker. However, not everyone has seen live ribbonfish and croaker swimming freely. These live fish are also not available for purchase in …
Why do fish sometimes jump out of the water?
At night, when we walk by the fish pond, we often hear “plop plop” sounds coming from the pond. Timid and superstitious people might think this is caused by water …
Why do fish scales sparkle?
You must have seen beautiful goldfish or brightly colored tropical fish. They dance gracefully in the water, swimming continuously; their bodies, covered in scales, shimmer with a gemstone-like brilliance. You …