Taxonomy & naming
Amphilius kakrimensis was described in 1987 by Guy Teugels, Paul Skelton and Christian Lévêque as part of a revision of West African Amphiliidae, the family of African loach-catfishes. It belongs to the genus Amphilius, one of the largest genera in the family, and to the family Amphiliidae, a group of small, scaleless, hillstream-adapted catfishes found across sub-Saharan Africa.
The species epithet kakrimensis refers to the Kakrima River, a tributary of the Kolenté River in Guinea and the fish's type locality — a naming pattern typical of Amphiliidae, where many species are described from a single named river or drainage they are effectively endemic to. There is no evidence in the available sources of this species ever having been placed in another genus; the Catalog of Fishes treats Amphilius kakrimensis as the currently valid combination.
Morphology
Amphilius kakrimensis is a very small catfish, reaching only about 1.5 in standard length — one of the smallest members of an already diminutive genus. Like other Amphilius it has the flattened head and depressed, elongate body typical of hillstream catfishes, an adaptation that lets it hug rock surfaces in fast current rather than being swept downstream.
As in the rest of the family, the skin is naked and scaleless, which is important for aquarium medication dosing (see "In the aquarium"). Amphilius species typically carry stiff spines at the leading edge of the dorsal and pectoral fins, an adaptation shared broadly across catfishes for defence; these can lock erect and snag in a net, so this genus is generally handled with care.
Habitat
This species is known only from the Kolenté River and its tributary the Kakrima River in Guinea, West Africa — a narrow highland range that defines its entire known distribution. Amphiliidae as a family are characteristic of African highland and hillstream habitats: high-altitude, perennial tributaries with rapids and riffles, coarse boulder and cobble substrate, and consistently high dissolved oxygen (in the range of roughly 7.9–8.2 mg/L in studied Amphiliidae streams).
Water in these mountain streams runs cool relative to lowland African rivers, typically at or below about 64 °F, and highly oxygenated from constant turbulence over rock. This is fast-flowing, clear, well-aerated water — the opposite of a still, soft blackwater habitat — and any aquarium approximation would need to replicate strong current and high oxygen rather than warmth and tannins.
Feeding
Amphilius kakrimensis is a benthic invertebrate feeder, foraging over the coarse stream substrate for aquatic insect larvae and other small invertebrates typical of fast, rocky highland streams. As with most Amphiliidae and hillstream catfishes generally, activity is thought to be largely nocturnal or crepuscular, with the fish sheltering among rocks by day and foraging as light fades.
No aquarium feeding record is available for this species specifically; based on family biology, a fish of this type would be expected to take small sinking invertebrate foods (chopped bloodworm, small frozen fare, sinking micro-pellets) offered after dark, rather than surface or flake foods.
Mating
No description of courtship or spawning behaviour for Amphilius kakrimensis is available in the sources consulted. Amphiliidae as a family are not known for elaborate courtship displays documented in the literature, and data on this specific, narrowly distributed species is sparse — reflecting how little studied most small West African highland-stream Amphilius species are outside their original taxonomic descriptions.
Breeding
There is no confirmed breeding record for Amphilius kakrimensis in the aquarium or in the wild literature available here. It is not a species in aquarium circulation, and nothing in the cache indicates an established spawning mode, egg-laying site or parental-care pattern. Rather than guess, the honest position is that breeding biology for this species is effectively undocumented; it should not be assumed to scatter eggs or to build a nest without direct evidence. Any aquarist attempting to keep or breed it would be working from family-level inference (Amphiliidae are generally substrate egg-layers with limited documented parental care) rather than species-specific data.
In the aquarium
Amphilius kakrimensis is not an aquarium fish in any meaningful sense — it does not appear to be traded, and there is no record of successful long-term aquarium husbandry in the sources available. Its real size is genuinely tiny, topping out around 1.5 in SL, but that alone does not make it suitable for a typical tank: this is a specialist mountain-stream fish that needs strong, oxygen-saturated current and cool water, conditions few home aquaria are set up to provide.
Were it ever kept, two family-level care points would apply. First, like other Amphiliidae it is scaleless, so it should be treated as medication-sensitive — copper-based and other harsh treatments should be dosed conservatively, often at half the labelled rate, as with loaches and other naked-skinned catfishes. Second, Amphilius species carry stiff, potentially locking fin spines that can snag a net, so any handling is best done by guiding the fish into a container rather than netting it directly.
Conservation
The IUCN Red List assesses Amphilius kakrimensis as Vulnerable. Its entire known range is restricted to the Kolenté and Kakrima river system in Guinea, a single small highland drainage, which makes the species inherently exposed to any localized pressure — siltation, deforestation of the catchment, water abstraction, damming or pollution could each affect the whole known population at once.
As with many single-river West African Amphiliidae, there is no aquarium trade drawing on wild populations; the conservation concern here is purely about habitat integrity in a small, poorly-buffered mountain catchment rather than collection pressure.