Chinese Algae Eater

The Gyrinocheilus aymonieri, commonly known as the Chinese Algae Eater or Siamese algae eater, is a fascinating freshwater fish species that hails from Southeast Asia. This captivating creature is highly sought after by aquarium enthusiasts due to its algae-eating capabilities and distinctive appearance. In this comprehensive guide, we will delve into the size and appearance, natural habitat, behavior, diet, and essential care tips for keeping Gyrinocheilus aymonieri in your home aquarium.


The Gyrinocheilus aymonieri can grow to an impressive size, reaching an average length of 25-28 centimeters (10-11 inches) when fully matured. In the aquarium they stay smaller, around 15 cm (5,9 inches) but the females grow a bit bigger. They possess an elongated, cylindrical body with a broad, sucker-like mouth located on the underside. Their coloration can vary, but the most common variety displays a dark gray to blackish body with a contrasting white or yellowish stripe that stretches from the head to the tail. The golden version is displayed in our pictures.


Originating from the rivers of Southeast Asia, particularly in China, Thailand, and Vietnam, the Gyrinocheilus aymonieri thrives in fast-flowing freshwater environments. Their native habitat consists of rivers, streams, and reservoirs with a rocky substrate and abundant vegetation.


Gyrinocheilus aymonieri are generally peaceful fish, but they can become territorial as they mature. One of the key attributes of Gyrinocheilus aymonieri is its algae-eating behavior, often seen grazing on rocks and aquarium surfaces in search of algae. It possesses specialized adaptations, such as a sucker-like mouth and rasping teeth, which allow it to graze on algae-covered surfaces. This makes it an effective natural cleaner in aquariums, as it helps to control and prevent excessive algae growth. However, it’s important to note that as they grow older, their dietary preferences may shift, and they may become less efficient at consuming algae, thus their name is actually a bit misleading. It is a social species that is best kept in groups of at least three individuals to promote natural behavior and reduce aggression.


The primary diet of the Chinese Algae Eater consists of algae and other forms of aquatic vegetation. While they are efficient algae eaters during their juvenile stage, as they mature, their preference tends to shift towards a more omnivorous diet. Therefore, it is recommended to supplement their diet with high-quality sinking pellets, spirulina flakes, and occasional live or frozen foods such as brine shrimp or bloodworms. Offering a varied diet helps ensure their nutritional needs are met.

Keeping the Chinese Algae Eater at home

Creating a suitable environment for Gyrinocheilus aymonieri in your home aquarium is essential for their well-being. Here are some key factors to consider:

Tank size: Provide a spacious aquarium with a minimum capacity of 200 liters (53 gallons) to accommodate the Chinese Algae Eaters comfortably.

Water parameters: Gyrinocheilus aymonieri is generally considered a hardy species. It can adapt to a range of water conditions, but it thrives in well-maintained aquariums with clean water, appropriate filtration, and ample swimming space. Maintain water temperatures between 24-28 degrees Celsius (75-82 degrees Fahrenheit) and a pH level around 6.0-7.5 to mimic their natural habitat. Regular water testing and appropriate filtration are crucial to maintaining optimal water quality.

Tank setup: Utilize a substrate composed of small gravel or sand, along with plenty of hiding spots and rocky caves for them to explore. Adding live or artificial plants will also provide a sense of security and aid in maintaining water quality.

Tankmates: Chinese Algae Eaters can coexist with other peaceful species that can tolerate their potential territorial behavior. Avoid keeping them with fin-nipping or aggressive fish to prevent stress or injury.

Algae control: While Chinese Algae Eaters do consume algae, it’s important to note that they may not eradicate all types. Regular maintenance, such as manually removing excess algae and maintaining a balanced aquarium, is necessary to keep algae growth in check.

By providing them with a suitable environment, a balanced diet, and proper care, you can enjoy the presence of this captivating species in your home aquarium. Remember to monitor their behavior and water parameters regularly to ensure their well-being and a thriving aquatic ecosystem.

Beyond its popularity among aquarium enthusiasts, Gyrinocheilus aymonieri plays a significant ecological role in its native habitats. By consuming algae, they contribute to the balance of aquatic ecosystems, helping to maintain water quality and preventing the overgrowth of algae that can negatively impact other organisms.

In conclusion, the Chinese Algae Eater is an intriguing fish species known for its unique appearance and algae-eating behavior. With proper care and maintenance, it can be a valuable addition to aquariums, contributing to both the aesthetic appeal and the ecological balance of the aquatic environment. Whether admired for its striking appearance or appreciated for its cleaning abilities, Gyrinocheilus aymonieri continues to captivate fish enthusiasts worldwide.

Scientific nameGyrinocheilus aymonieri
Type of aquariumFreshwater aquarium
SizeUp to 25-28 centimeters / 10-11 inches
RegionSoutheast Asia (China, Thailand, Vietnam)
Ideal tank sizeMinimum 200 liters / 53 gallons
Ideal water temperature24-28 °C / 75-82 °F
pH6.0 – 7.5
DietAlgae, supplemented with sinking pellets, spirulina flakes, and occasional live/frozen foods
ReproductionEgg-laying species
Life spanApproximately 5-10 years
SchoolingCan be kept individually or in small groups

Would you like to contribute you own information based on experience to our article? Please use our contact form here, leave the info below in a comment or send us an email at


Share on Facebook
Share on Twitter
Share on Linkedin