Yasuhikotakia Eos

Datasheet

Behaviour

The Sun Loach, Yasuhikotakia eos, is known for its territorial behavior, particularly in limited space or shelter situations. It is recommended to keep them in larger, well-structured community aquariums, avoiding slow-moving or long-finned species. When kept in groups, these loaches exhibit gregarious behavior, forming complex social hierarchies. The alpha fish, typically the largest and often female, can influence the behavior of the entire group. Yasuhikotakia spp. have been observed performing 'greying out' during dominance battles, engaging in a 'shadowing' behavior, and partaking in a peculiar 'loachy dance' in response to various triggers in the environment.

Feeding and Diet

The Sun Loach is primarily carnivorous but will consume vegetative matter, requiring a varied diet. They accept quality dried foods, live or frozen bloodworms, and fresh fruits and vegetables. Care should be taken not to overfeed with chopped earthworms, as these should be used sparingly. While these loaches may prey on aquatic snails, they are not considered obligate molluscivores and should not be solely relied upon for snail control. Maintaining a diverse diet is essential for their overall health.

Reproduction & Dimorphism

Breeding Sun Loaches in private aquariums is not commonly reported, and commercial breeding often involves the use of hormones. In their natural habitat, spawning occurs at the onset of the wet season, with juveniles displaying dark vertical bars on their flanks that fade as they mature. Sexually mature females tend to be fuller-bodied and slightly larger, while breeding males develop a distinct 'navy blue' body color with a red margin on the dorsal fin.

Habitat and Distribution

Yasuhikotakia eos is native to the Nam Ngum river basin in Vientiane province, Laos, within the Mekong River system. They are also found in various localities across Laos, Cambodia, Thailand, and in drainages like the Dong Nai in Vietnam. In their natural habitat, they prefer fast-flowing waters with substrates of cobbles, boulders, sand, or mud. It is essential to replicate these conditions in the aquarium setup to ensure their well-being.

Aquarium Setup

For Yasuhikotakia eos, a well-structured aquarium setup is crucial. Utilize sand or fine gravel substrate with smooth rocks, driftwood, and plants like Java fern or Java moss. Providing ample hiding spots and exploration areas is recommended. These loaches have sharp spines that can become entangled, so be cautious during handling. Maintain clean, oxygenated water with a moderate flow and perform regular water changes to keep the environment stable and suitable for the Sun Loach.