Peter's Elephant Nose Fish - Gnathonemus petersii : Complete Fish Profile & Care Guide

Introduction

The Peter's Elephant Nose Fish  (Gnathonemus petersii) is a remarkable freshwater species that stands apart from its counterparts in terms of its unique and captivating appearance. However, due to their sensitivity to suboptimal habitat conditions, these fish are best suited for experienced rather than beginner aquarists.

While generally docile when kept in captivity, Peter's Elephant Nose Fish can exhibit aggression towards other fish species, although some individuals thrive in community aquarium setups. Nevertheless, it is crucial to note that unless housed in an aquarium of over 400 litres (88 imperial gallons; 110 US gallons), Elephantnose fish display aggressive territorial behaviour towards their own kind, making it unsuitable to keep more than one specimen in captivity.

When selecting tankmates, it is advisable to choose medium-sized, peaceful species. Suitable companions may include African Butterfly Fish, Angelfish, Bichirs, Ctenopomas, Geophagus Cichlids, Gouramis, large deep-bodied Tetras, Discus, and Corydoras Catfish. However, it is important to avoid housing them with aggressive or boisterous species to ensure that the Peters' Elephant Nose Fish is not outcompeted during feeding time.

This endearing species has specific care requirements that need to be addressed. The substrate should consist of sand, and due to their substantial size, an aquarium with a minimum length of 5 feet and a width of at least 2 feet is necessary. Providing a selection of shaded hiding spots such as PVC tubes, rocky caves, and ample tangles of driftwood is essential for their well-being.

Lighting should be moderate rather than excessively bright, as Peter's Elephant Nose Fish are nocturnal and sensitive to intense illumination. If certain areas of the tank require brighter lighting, including broad-leaved aquatic plants and floating species can help diffuse the light. However, it is crucial to ensure that the tank provides areas of darkness for the fish to retreat to during the day as needed.

Efficient filtration is important, but water movement should be gentle, and a consistent maintenance regimen that includes regular partial water changes is vital. Peters' Elephant Nose Fish  are sensitive to elevated nitrate levels and sudden fluctuations in water chemistry, necessitating careful attention to water quality.

Regarding their physical characteristics, Peter's Elephant Nose Fish exhibit a dark brown to black colouration with a laterally compressed body. Their rear dorsal fin and anal fin are of equal length, and the caudal fin is forked. Notably, they possess two white stripes on their lower body. 

The most remarkable feature, as their name suggests, is the trunk-like protrusion on their head. It is important to clarify that this extension is not a nose but a sensitive appendage connected to its mouth, serving multiple purposes such as self-defence, communication, navigation, and locating worms and insects for nourishment.