Taxonomy & naming
Lophiobagrus brevispinis was described by Reeve M. Bailey and Donald J. Stewart in 1984, in "Bagrid Catfishes from Lake Tanganyika, with a Key and Descriptions of New Taxa," published by the Museum of Zoology at the University of Michigan. It belongs to the family Claroteidae and to the genus Lophiobagrus, a group of four small, Tanganyika-endemic catfish — L. aquilus, L. asperispinis, L. brevispinis and L. cyclurus — that Bailey and Stewart separated from the closely related genus Chrysichthys on the basis of a distinctive pectoral-girdle bone, the mesocoracoid, a feature otherwise shared only with the genus Phyllonemus. The Catalog of Fishes (Eschmeyer, CAS) treats Lophiobagrus brevispinis Bailey & Stewart, 1984 as the valid name, with no synonyms recorded.
The holotype, UMMZ 199930 (1.5 in SL, 2 in TL), was collected 1 mi north of Mpulungu, Zambia, in October 1970, along with a large paratopotype series taken at the same site. Additional paratypes came from further localities in Zambia and from Burundi and what was then Zaire, now the Democratic Republic of the Congo — all within Lake Tanganyika.
Morphology
L. brevispinis has the slender, dorsoventrally depressed body and head typical of its genus, a subterminal mouth, and the barbels characteristic of claroteid catfish. Bailey and Stewart describe a comparatively long nasal barbel that extends past the middle of the eye and a short maxillary barbel that falls short of the pectoral-fin insertion. Coloration is a relatively light olive-brown. Within the genus, the species is distinguished by a very short dorsal spine (1–8% of standard length), a short posterior cleithral process and pectoral spine, an adipose-fin origin above or behind the anal-fin origin, and lower gill-raker and anal-ray counts than its congeners.
It is one of the smallest catfish in Lake Tanganyika. FishBase records a maximum of 2 in total length; the type series ranged from 0.5–2 in standard length, consistent with the holotype's 1.5 in SL / 2 in TL. By comparison, the largest recorded specimen of its congener L. cyclurus reached about 3.5 in SL. The species name reflects this proportion directly: brevispinis, from Latin brevis (short) and spina (thorn), refers to dorsal and pectoral spines that are short and only weakly armed compared with the stronger, more heavily serrated spines of other Lophiobagrus.
Habitat
Lophiobagrus brevispinis is endemic to Lake Tanganyika, the East African rift lake bordered by Burundi, the Democratic Republic of the Congo, Tanzania and Zambia. Records span the type locality near Mpulungu at the lake's southern, Zambian end, sites in Burundi at the northern end, and localities on the Congolese shore, leading Bailey and Stewart to conclude that the species — like most of its genus — is probably distributed generally around the lake's perimeter rather than confined to one region.
The species occupies the littoral rock-rubble zone, wedging into narrow crevices among boulders exposed to strong wave action. At the type locality the water was clear, with visibility to about 16 ft and a temperature of 81 °F, over a rock-rubble shoreline from the surface to about 10 ft depth. Rotenone sampling elsewhere in Zambia found the great majority of Lophiobagrus specimens shallower than about 13 ft, with only a small fraction taken as deep as 46 ft, and there is no record of the genus entering the rivers that feed the lake. Its very small mature size lets it occupy tight interstitial spaces unavailable to the larger, more offshore-ranging bagrid catfish of the genus Chrysichthys, with which its distribution in the lake appears broadly complementary.
Feeding
No dedicated study of wild diet has been published for Lophiobagrus brevispinis; FishBase lists it only as a species of no commercial food-fish value, without diet data. Its small size, subterminal mouth and rock-crevice habitat are consistent with an opportunistic invertebrate feeder or scavenger, in keeping with other small Tanganyika littoral catfish, but this has not been directly confirmed by any published study.
The one detailed aquarium account available (Derek Walker, MASI's The Darter, 2018) describes the species as a vigorous, unfussy eater that readily took a soft, mussel-based pellet food and would take almost anything with a strong smell. The keeper speculated that in the lake the fish might scavenge on the carcasses of dead cichlids among the rocks, though this remains conjecture rather than an observed behavior.
Mating
No formal study of reproductive behavior in the wild has been published for this species. The only detailed account available comes from a home aquarium (Derek Walker, MASI's The Darter, 2018): four wild-caught individuals were kept for about two years in a 10-gallon tank furnished with caves and white sand, and remained shy and reclusive for roughly six months before showing any breeding activity. After being fed a protein-rich pellet food for about three weeks, one female's abdomen visibly swelled with eggs, and males became noticeably territorial around the cave each had claimed. The keeper reported being able to tell the sexes apart once the fish reached this stage, though no specific external trait — coloration, fin shape or otherwise — was described.
Breeding
In the same account, a female laid a compact cluster of eggs at the rear of a small cave, a spawning style the observer compared directly to that of plecostomus catfish. Care of the eggs was shared between adults: one would leave the cave as another entered to stand guard, though the male appeared to be the primary caretaker. Because the parents moved constantly in and out of the cave, the exact hatching moment was hard to observe directly; the eggs were gone after roughly a week to ten days, and free-swimming fry were seen about a week after that. The fry stayed hidden among tank plants and did not move about openly until they were roughly three months old.
At a later spawning in the same tank — in a length of PVC pipe, with a different male — the fry disappeared entirely, and the keeper suspected the adults had eaten their own offspring. This is, to date, the only documented captive breeding of Lophiobagrus brevispinis found in the hobby literature; no wild reproductive data exists for comparison.
In the aquarium
Lophiobagrus brevispinis is a genuinely small catfish, reaching only about 2 in, and the one documented long-term account kept a group of four in a 10-gallon tank furnished with caves and a sand substrate without difficulty. The fish were notably shy, staying under cover through the day and showing no interest in additional plant cover offered as enrichment; individuals can remain hidden for months even after settling in. Once a cave is claimed as a breeding site, fish — particularly males — become territorial around it, and providing more than one cave or tube option reduced aggression in the reference account.
Feeding is straightforward: the species took sinking pellets and other prepared foods readily. As with all Lake Tanganyika endemics, water should be hard and alkaline rather than soft or acidic; the one keeper account required no pH adjustment from ordinary tap water, though that reflects the keeper's local supply rather than a documented tolerance for softer conditions. A further point applies to the genus as a whole: Bailey and Stewart (1984), citing the aquarist Pierre Brichard, report that when confined in a tank Lophiobagrus can exude a sticky mucus that has killed other fish within minutes, possibly from an enlarged gland behind the pectoral girdle. This has not been documented specifically for L. brevispinis, and a similar report for the congener L. cyclurus is described by Seriously Fish as an unconfirmed rumor rather than a settled fact — but it argues for keeping any Lophiobagrus in a reasonably sized, well-filtered tank rather than a cramped one, and for care when netting or otherwise stressing the fish.
Conservation
The IUCN Red List assessed Lophiobagrus brevispinis as Least Concern in 2006, based on an evaluation by G. Ntakimazi. The rationale cites a wide distribution within Lake Tanganyika and a small, rock-dwelling habit that keeps the species out of fisheries catches entirely; siltation and heavy fishing pressure affect parts of the lake locally, but no threat was judged severe enough to place the species in a higher risk category. The assessment has not been updated since 2006.
As with other Lake Tanganyika endemics, the species' long-term outlook depends on the health of the lake as a whole. Tanganyika faces ongoing pressure from deforestation-driven sedimentation, reduced deep-water mixing linked to warming, and expanding artisanal fishing and shoreline development. Trade demand for this species appears negligible — it has no established common name and is only occasionally available — so collection is not considered a factor in its status.