Chinese Algae Eater

This fish has an elongated body. In an aquarium it usually stays within 12–13 cm, but it can potentially reach 28 cm, which should be taken into account when choosing a tank size. A distinctive feature is its mouth, which is a sucker surrounded by small tubercles or “spikes.” This structure is ideally adapted for secure attachment to various surfaces, especially in conditions of fast currents. The fish's coloration is variable: most often, individuals with yellowish sides and a darker back are encountered. A dark line or stripe runs along the entire body, from head to tail, which can sometimes break into a series of black spots. There are various morphological forms, differing in color, such as golden, marbled, and albino. Visually, males can be distinguished from females by a greater number of tubercles or “spikes” around the mouth, which are particularly noticeable during the breeding season.

First described in 1883, the species is widely distributed in the Mekong, Chao Phraya, Mae Klong and Dong Nai basins, in Thailand, Laos, Cambodia and Vietnam. The trade names “Chinese” and “Indian” algae eater are misleading: the fish occurs naturally in neither country. From the middle of the twentieth century, specifically the 1950s, it began to be shipped to Europe as an aquarium fish; notably, in its native land this fish forms part of the local diet. Its natural habitat includes large and medium rivers, as well as plains flooded during the wet season. These fish are often found in small, well-lit streams and pools where algae grow abundantly. Thanks to a mouth resembling a sucker, the algae eater feeds efficiently on periphyton — a complex of algae, small bacteria and detritus. Adults also take the chance to feed on zooplankton and small insect larvae.

While young individuals are peaceful and get along well with various fish species, over time their behavior changes: the fish becomes territorial and may show aggression towards other aquarium inhabitants. Intraspecific aggression can be reduced somewhat by keeping a group of at least six individuals: a pecking order forms and weaker fish are targeted less often. Such a group, however, requires a very large aquarium. When keeping adult fish, it is recommended to choose active species that prefer to inhabit mainly the upper layers of the water. Coexistence with African cichlids is also possible.

These fish require high oxygen content in the water and the creation of artificial current. This is easily achieved by using a powerful filter combined with an aerator. Since the Chinese Algae Eater prefers bottom layers, regular cleaning of the substrate (approximately once every two weeks) will help prevent poisoning from organic decomposition products. It is important not to siphon decorative elements of the aquarium (snags, rocks, etc.), as a biological film forms on them, serving as an additional food source for the pet. The aquarium decor is recommended to approximate natural living conditions, using thickets of plants, soft sand, and scattered pieces of rock or large smooth stones on the bottom. Several caves or shelters can also be provided. Bright lighting for active algae growth, which is part of the fish's diet, is desirable but not a strict requirement.

Young individuals feed exclusively on plant-based food, consuming algae, as well as spinach leaves, lettuce, pieces of cucumber or zucchini, and dry commercial foods for herbivorous fish. The amount of supplementary feeding is determined by the volume of algae in the aquarium: with abundant growth on glass and decorations, the need for additional feeding decreases. If the aquarium looks perfectly clean and no traces of algae are visible, it means the fish has completely eaten them and needs additional food sources. With age, the Gyrinocheilus's diet begins to change, and it requires the inclusion of protein food, such as Artemia, Daphnia, bloodworms, or frozen foods. It is important to combine this type of feeding with plant-based food. If there is a lack of meaty products, the fish may attach itself to other aquarium inhabitants, eating their protective mucus.

Breeding this species in home aquariums is associated with significant difficulties, and successful cases are extremely rare and accidental.

The fish shows sensitivity to a number of medications that are usually well tolerated by most species in community tanks. In addition, digestive problems can arise if the fish eats the protective mucus from other aquarium inhabitants. Features.

When choosing a Gyrinocheilus, opt for active young individuals, as adult fish often exhibit pronounced territorial aggression. Carefully inspect the fish for the integrity of its skin and fins: the absence of wounds, ulcers, and film indicates good health. Avoid purchasing individuals with sunken bellies, which may indicate exhaustion or internal diseases. Keep in mind that fish may appear peaceful in the store, but their character changes with age, so plan compatibility with future tank mates in advance.