50-150 centimeters
The size of koi fish is influenced by various factors, including their breed, the environment they are raised in, and the nutritional conditions. Here is a detailed analysis of the size of koi fish:
1. General Size Range
The body length of common koi fish usually ranges between 30-40 centimeters. However, under ideal conditions, koi fish can grow to be 50-150 centimeters long. If they are properly raised, some koi fish may even exceed the limit of 150 centimeters.
2. Growth Rate
- Juvenile Stage (0-6 months): They grow approximately 0.71 millimeters per day, which is about 2.13 centimeters per month.
- 6-12 months: They grow about 0.58 millimeters per day, which is roughly 1.74 centimeters per month.
- At one year old: Their body length can reach around 23.3 centimeters.
- At two years old: Their body length can reach about 39.6 centimeters.
Before the age of 6.5 years old, koi fish grow relatively fast, and their length can reach 50-70 centimeters. After that, the growth gradually slows down.
3. Special Breeds and Records
- Longfeng Koi Fish: Under mature breeding conditions, they can grow to be 80-100 centimeters long. However, in home aquariums, their growth is usually limited to around 50 centimeters.
- Giant Koi Fish: With scientific feeding, koi fish, such as the giant koi fish in Jinan, can reach a body length of 1.08 meters.
4. Influencing Factors
- Genes and Breeds: Koi fish with excellent genes are more likely to grow into giant carp.
- Raising Space: A large pond or fish tank is beneficial for the full growth of koi fish.
- Nutrition and Water Quality: High-protein feed, clean water quality, and a suitable water temperature (20-25°C) can promote the rapid growth of koi fish.
In conclusion, koi fish have great potential in terms of size, but their actual size depends on the breeding conditions and the characteristics of the breed. Longfeng koi fish and giant koi fish are special breeds that are worth paying attention to.