Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Characiformes
(Characins) > Lebiasinidae
(Pencilfishes) > Lebiasininae
Etymology: hoffmannorum: Named for Peter Hoffmann. More on authors: Géry & Zarske.
Environment: milieu / climate zone / depth range / distribution range
Freshwater; pelagic. Tropical
South America: Mazaruni River, Guyana.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 6.1 cm SL male/unsexed; (Ref. 47610)
soft rays: 9 - 10. Elongated body (greatest depth 4.60-5.45 in SL) with a narrow caudal peduncle; symmetrical caudal fin and a dorsal fin far backward. Transverse scales from dorsal to pelvic, 6 or 6.5; predorsal scales 15.5 or 16. Mouth somewhat superior with a short maxilla (apparent length 4.5-5.5 in HL), not quite reaching the level of the eye's front margin. Eyes relatively large. A longitudinal black band surmounted by a light line, from opercle to base of middle caudal rays (Ref. 47610).
A shy species (probably the most timorous pencil-fish species), living mainly on the surface and hidden, when possible, under a floating leaf or other hiding possibility. Swims actively, in a fitful manner, the moving of the pectorals is alternative, not symmetric. In captivity, accepts all foods, including dry ones, but only on the surface, neglecting what falls on the bottom. No peculiar nocturnal coloration; no direct courtship was yet observed, only short hunts against each other (within and between sexes) without real fights (Ref. 47610).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Géry, J. and A. Zarske, 2002. Derhamia hoffmannorum gen. et sp. n. - a new pencil fish (Teleostei, Characiformes, Lebiasinidae), endemic from the Mazaruni River in Guyana. Zool. Abh., Staat. Mus. Tierk. Dresden (52):35-47. (Ref. 47610)
IUCN Red List Status (Ref. 120744)
CITES (Ref. 118484)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), in cm Total Length, based on all LWR estimates for this body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.4 ±0.4 se; Based on size and trophs of closest relatives
Resilience (Ref. 120179
): High, minimum population doubling time less than 15 months ().
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .