Taxonomy & naming
Gymnotus tiquie was formally described by Maxime, Lima & Albert in 2011, in a paper (published in Copeia) devoted to a new species of Gymnotus from the Rio Tiquié in northern Brazil. It belongs to the family Gymnotidae within the order Gymnotiformes, the New-World electric knifefishes — bony fish, but unusual ones, defined by an electric organ and a ribbon-like anal fin rather than by the fin arrangement of typical teleosts. The Catalog of Fishes (Eschmeyer, California Academy of Sciences) lists Gymnotus tiquie as a valid name in the genus Gymnotus, family Gymnotidae.
Within Gymnotus, tiquie is placed in the Gymnotus pantherinus species group, one of several morphologically defined clusters used to organize a genus that has expanded rapidly through species-level revisions over the past two decades — the widespread "Gymnotus carapo" of older literature has since been split into more than twenty distinct species. As with other gymnotiforms, the epithet ties the fish directly to its type locality: the Rio Tiquié. Despite the shared common name "knifefish", Gymnotus and its relatives are not related to the Asian featherback and clown knifefishes (Chitala, Notopterus); the resemblance in body shape is convergent, not a sign of kinship.
Morphology
Gymnotus tiquie reaches a modest maximum size of about 9.5 in total length, small for the genus. Like other banded knifefishes it has a stout, laterally compressed body patterned with dark, oblique pigment bands arranged in pairs — the barred look that gives the group its common name — and, typical of Gymnotidae, no scales at all. There is no dorsal fin and no true tail fin; propulsion comes from a long anal fin run in a travelling wave along the underside of the body, letting the fish glide forward or backward with equal control.
Running through the body is the electric organ that defines the order, paired with electroreceptor pores across the skin that read the field it creates. Gymnotus produces a pulse-type electric organ discharge — short, discrete pulses separated by gaps, in contrast to the continuous wave-type signal of fish like the ghost knifefishes (Apteronotidae). FishBase records needle-shaped dentary teeth suited to an active predatory diet, a trophic level around 3.3, and a facultative air-breathing capacity shared across the genus that lets it tolerate poorly oxygenated water. Sexes are not reported to differ visibly in this species.
Habitat
The species is known from the Rio Tiquié, a clearwater tributary of the Vaupés River in the upper Rio Negro basin of Amazonas state, Brazil — a narrow-range endemic so far as the available record shows. It lives in small terra firme forest streams away from the seasonally flooded várzea, in shallow water no more than about half a metre deep, over sand and leaf litter beneath forest cover.
These clearwater habitats are typically soft, acidic and low in dissolved minerals, shaded by closed canopy, and — like most gymnotiform habitats — offer little for a fish that relies on eyesight. That is precisely the setting in which electrolocation is most useful: the shallow, structurally complex, dimly lit stream bottom is easy to navigate and hunt in in the dark using an electric field, and hard to navigate by sight alone. Nothing in the available sources suggests this species is found outside the Tiquié drainage.
Feeding
Gymnotus tiquie is presumed to feed as other banded knifefishes do: as a nocturnal predator of small invertebrates and other prey on and in the stream substrate, located by electrolocation rather than sight. FishBase's trophic level estimate of roughly 3.3 and its note of needle-shaped dentary teeth both point to an active, carnivorous diet typical of the genus, likely aquatic insect larvae, small crustaceans and worms picked out of sand and leaf litter after dark.
No species-specific feeding study is available in the cache, so details of diet composition and foraging behaviour for G. tiquie itself remain data sparse; the diet note here follows the well-documented pattern of the genus rather than direct observation of this species.
Mating
As in other Gymnotus, the electric organ discharge in this species is thought to serve a dual role — electrolocation and communication — meaning it likely carries information relevant to species recognition, sex and reproductive state, and would feature in any courtship encounter played out largely in darkness. This mirrors what is documented for the well-studied congener Gymnotus carapo, where males and females use their pulse discharges, alongside physical approach, in the run-up to spawning.
No direct observations of courtship in Gymnotus tiquie itself are available; this account follows the genus pattern rather than a species-specific record, and should be read as inference, not documented fact.
Breeding
Breeding has not been documented for Gymnotus tiquie, and the species has essentially no presence in the aquarium trade. Extrapolating from the genus — most concretely from Gymnotus carapo, where captive breeding has been recorded — Gymnotus males build and guard a nest, often a bottom depression or a shelter among submerged vegetation, into which the female spawns; the male then guards the eggs and larvae, an unusual degree of paternal care for a fish of this kind. Spawning in the wild is typically tied to the wet season and rising water.
Whether this pattern holds for G. tiquie specifically is unconfirmed; the species should be treated as unbred and essentially unstudied in captivity, and any breeding claim beyond the genus-level pattern would be guesswork.
In the aquarium
Gymnotus tiquie is not established in the aquarium hobby and no husbandry record exists for it; this section describes what would be expected of a small Gymnotus species based on the genus, not confirmed practice for this fish. Like all gymnotiforms it is scaleless, which means real caution is warranted with medications — no copper-based treatments, and reduced doses of anything else — and consistently good water quality, since scaleless fish are unusually sensitive to ammonia and nitrate.
Banded knifefish are nocturnal predators, not community-safe with small tankmates or shrimp, and do best with dim lighting and secure cover such as caves, pipes or driftwood where they can retreat by day. Facultative air-breathing gives the genus real tolerance for warm, oxygen-poor water, but that is not licence for poor husbandry. Given its small size (to about 9.5 in) it would be more modestly proportioned than the larger Gymnotus species, but with essentially no trade history, any aquarist encountering this species should treat it as unstudied and proceed conservatively.
Conservation
Gymnotus tiquie is assessed as Least Concern on the IUCN Red List (assessed 2018). FishBase further notes low fishing vulnerability (14 out of 100) and high population resilience, with a minimum population doubling time of under 15 months — indicators consistent with a species facing limited pressure at present, at least within the sampled part of its range.
As a narrow-range endemic confined to small terra firme streams of a single tributary system, however, the species shares the structural vulnerability common to many such Gymnotus: a restricted, incompletely surveyed range means that habitat degradation, deforestation or water-quality change in the Tiquié drainage could affect it disproportionately even without a large population decline showing up in current assessments. There is no indication in the available sources of active threats specific to this species.