Rhinogobius Leavelli

Datasheet

General Description

Rhinogobius leavelli is a species within the Gobiidae family characterized by its existence in various forms displaying differences in color pattern and morphology. The species shares similarities with other Rhinogobius varieties in the aquarium trade. It is identifiable by having more pectoral fin rays compared to congeners and a dark vertical bar at the base of the pectoral fin. The genus Rhinogobius is part of the Gobionellinae subfamily and exhibits distinctive features typical of gobiid genera.

Aquarium Setup

For optimal maintenance, Rhinogobius leavelli thrives in an environment replicating a flowing stream. The tank should include a substrate of rocks, sand, fine gravel, and water-worn boulders. Decor elements such as driftwood branches, terracotta pipes, and plant pots can be added to provide hiding spots and broken lines of sight. Hardy aquatic plants like Microsorum, Bolbitis, or Anubias spp. can be attached to the decor. Regular water changes of 30-50% tank volume are crucial to ensure clean water conditions. Although torrent-like conditions are unnecessary, maintaining high dissolved oxygen levels and some water movement with power filters, powerheads, or airstones is recommended.

Behaviour

Rhinogobius leavelli is a peaceful, pelagic species ideally housed with non-threatening tankmates like Tanichthys, Danio species, or Rhinogobius spp. While males exhibit territorial behavior, the presence of conspecifics is essential. Avoid mixing them with congeners, especially closely-related species like R. nantaiensis. Larger, predatory fishes and territorial species should be omitted from their tank to prevent aggression. It is recommended to keep at least two males with multiple females to prevent listlessness.

Feeding and Diet

As opportunistic carnivores, Rhinogobius spp. feed on small invertebrates and crustaceans. In an aquarium setting, they should be offered small live or frozen foods such as bloodworms, mosquito larvae, Artemia, and Daphnia. While they may acclimate to dried foods over time, these should not be the primary diet source.

Reproduction & Dimorphism

The breeding strategy of Rhinogobius leavelli varies depending on wild populations, with some exhibiting an amphidromous breeding strategy. In captivity, breeding can be stimulated by providing a flat rock for egg deposition. Males guard the eggs and take care of the fry post-hatching. Males are more colorful and develop extended dorsal and anal fin rays as they mature, distinguishing them from females.

Habitat and Distribution

These species are widely distributed across various countries in Asia, including Russia, China, Vietnam, and Thailand. The natural habitat includes freshwater and brackish streams. In their native environment, the fish exhibit complex breeding strategies, with different populations showing adaptations to freshwater or brackish conditions. Understanding their distribution and habitat preferences is crucial for replicating optimal conditions in the aquarium setup.