Yes, but it specifically depends on the breeding environment.
1. Oxygen Requirements of Koi Fish
Koi fish are high - oxygen - consuming fish and have a high demand for dissolved oxygen. Sufficient oxygen can not only help them breathe better but also promote digestion and metabolism, thereby accelerating their growth rate.
2. Oxygen Requirements in Different Breeding Environments
Indoor Aquarium Breeding: Due to the small water volume and limited dissolved oxygen, an oxygen pump is usually required and should be turned on 24 hours a day to ensure the health of koi fish.
Pond Breeding: If the water body is large and the fish population density is moderate, additional oxygenation may not be necessary. However, if the fish show signs of oxygen deficiency such as surfacing, the oxygen pump should be turned on immediately.
3. Selection and Use of Oxygen Pumps
Small Aquariums: A small air pump of about 10W with 2 - 3 air stones can be used.
Large Ponds: Due to the high water pressure, a large air pump of more than 60W with multiple air stones is required to ensure that oxygen can fully reach the bottom of the water.
4. Other Oxygen - Increasing Methods
In addition to the oxygen pump, the dissolved oxygen in the water can also be increased through a trickle system or a plant waterway, especially in large ponds.
Summary: Whether koi fish need an oxygen pump mainly depends on the breeding environment and water conditions. Indoor aquarium breeding usually requires it, while pond breeding depends on the specific situation. Selecting the appropriate oxygen - increasing equipment and methods is the key to ensuring the healthy growth of koi fish.