Acheilognathus Signifer

Datasheet

General Description:

The Korean Bitterling, scientifically known as Acheilognathus Signifer, is a species endemic to the Korean peninsula, particularly found in southern North Korea and northern South Korea. This species belongs to the diverse genus Acheilognathus, characterized by specific physical attributes like a deep brown dorsal fin with a marginal white band and an anal fin with longitudinal cross bars. Being a member of the Cyprinidae family, these fish have a maximum size of 7.5cm and are typically located in cool, clean waters with substrates of coarse sand or gravel and vegetated margins.

Aquarium Setup:

Creating an aquarium habitat for Acheilognathus Signifer should mimic its natural environment, incorporating cool, clean water with a substratum of coarse sand or gravel and vegetation. The tank should be relatively shallow and well-aerated. Maintaining water quality is crucial, as these bitterlings rely on it for breeding and survival. For detailed setup guidelines, please refer to the table provided.

Behaviour:

The Korean Bitterling engages in a unique spawning behavior where it utilizes bivalve mussels as a spawning substrate. Females develop an elongated ovipositor to deposit eggs in the mussels, followed by males fertilizing the eggs. This species demonstrates aggressive behavior during breeding to protect their young. Juveniles stay within the mussel until ready to swim freely, showcasing remarkable adaptation.

Feeding and Diet:

These bitterlings are known to be omnivorous feeders. In their natural habitat, they consume a diet consisting of algae, small invertebrates, and other organic matter found in the water. When kept in captivity, a balanced diet including high-quality flake or pellet food supplemented with live or frozen foods like bloodworms and brine shrimp is recommended.

Reproduction & Dimorphism:

Acheilognathus Signifer follows a unique reproductive strategy where they rely on bivalve mussels to facilitate spawning and incubation of their young. Female bitterlings deposit eggs in the mussels, and males fertilize them, showing parental care behavior. While both male and female bitterlings display similar physical characteristics, males may exhibit slightly brighter colors during the breeding season.

Habitat and Distribution:

Endemic to the Korean peninsula, the Korean Bitterling is primarily found in the Han river system in northern South Korea. Due to habitat deterioration and human impact, many populations have been extirpated, leading to endangered status in certain regions. This species thrives in shallow, flowing waters with sandy or gravelly substrates and vegetation along the margins. The type locality for Acheilognathus Signifer is believed to be in Kangwon province, North Korea.