Fish-Keeping Knowledge: From Water Quality to Feeding, How to Raise Fish Well

Fish-keeping knowledge broadly refers to the techniques and experience needed to raise fish, covering water quality management, daily feeding, species selection and disease prevention and control. Whether it is ornamental fish in a home aquarium or food fish raised in a pond, these basics are indispensable.

Water quality is the key to success in fish keeping, which is why it is often said that keeping fish starts with keeping water. Tap water usually contains chlorine, so it generally needs to stand or be aerated before use, and during rearing, filtration equipment is also needed to keep the water clean. When changing water, it is best to change small amounts more often, replacing only part of the old water each time, and to make sure the temperature difference between the new water and the old is not too great, so the fish do not become stressed.

Feeding calls for fixed times and fixed amounts. Different fish have quite different feeding habits, so herbivorous, omnivorous and carnivorous fish each need suitable feed chosen for them. Feeding too much at one time not only means the fish cannot finish it; the leftover food sinks and spoils the water quality, which is one of the most common mistakes beginners make.

Choosing fish and controlling density are equally important. Common ornamental varieties kept at home include goldfish, koi and guppies, while ponds more often hold traditional food fish such as grass carp, silver carp and crucian carp. The number of fish should match the size of the water body and its filtration capacity; too high a density easily leads to oxygen shortage and disease.

Observe carefully every day. If fish gasp at the surface, show white spots on the body surface, or have rotting fins, it often signals oxygen shortage or illness, and you should promptly increase aeration, adjust the water, or isolate the affected fish. Newly bought fish are best kept separately and observed for a period before being added to the group, to reduce the risk of cross-infection. Only by mastering these basic fish-keeping skills solidly can you keep fish healthy for the long term.