Classification / Names
Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa
Actinopteri (ray-finned fishes) > Siluriformes
(Catfishes) > Plotosidae
Etymology: Tandanus: A local name, tandan, in Australia; tropicanus: Named in reference to the region of northeastern Australia that represents the species’ range.
Environment: milieu / climate zone / depth range / distribution range
Freshwater; demersal. Tropical
Oceania: Australia from coastal rivers within the wet tropics region of northeast Queensland, including the Daintree, Mulgrave-Russell, Johnstone, Tully, and Five Mile drainage basins.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 39.5 cm SL male/unsexed; (Ref. 96080)
Morphology | Morphometrics
soft rays: 150 - 165. Tandanus tropicanus is distinguished from its congener T. tandanus from different drainages. In the Murray-Darling drainage, it differs from T. tandanus by having the following characters: 150-165, mode 156 rays in the continuous caudodorsal and anal fins (vs. 136-149, mode 143); 31-35, mode 31, gill rakers on the first arch (vs. 24-30, mode 28); interorbital width 32.9-38.4% of HL mean 36.2% (vs. 40.3-47.7%, mean 43.5%); pectoral spine 11.1-14.0% of SL, mean 12.4% (vs. 8.9-11.2%, mean 10.1%). For individuals >20.5 cm SL, T. tropicanus can be diagnosed from T. tandanus of the Murray-Darling drainage by having 12-19 (mode 14) posterior serrae on the pectoral-fin spine (vs. 7-11, mode 9). Also, individuals >7.0 cm HL, T. tropicanus differs from T. tandanus of the Murray-Darling drainage by having the following characters: length of the inner mandibular barbel 32.3-41.0% of HL, mean 36.1% (vs. 40.9-54.7%, mean 46.7%); distance between bases of outer mandibular barbels 27.4-33.8% of HL, mean 29.6% (vs. 21.2-25.9%, mean 24.4%); distance between bases of inner mandibular barbels 13.5-15.9% of HL, mean 14.8% (vs. 10.4-13.2%, mean 12.0%); distance between bases of maxillary barbels 47.0-53.5% of HL, mean 50.1% (vs. 39.5-46.6%, mean 44.2% ); maximum cleithral width 75.6-81.4% of HL, mean 78.2% (vs. 68.6-75.2%, mean 71.9%); and eye diameter 14.7-17.2% of HL, mean 15.6% (vs. 12.3-14.6%, mean 13.6%).
In the eastern coastal drainages of Australia (Burnett, Tweed, Brisbane, Fitzroy, Clarence, Mary, and Richmond), Tandanus tropicanus differs from T. tandanus by having the following features: 150-165 rays (mode 156) in the continuous caudodorsal and anal fins (vs. 132-147, mode 145); gill rakers on the first arch 31-35, mode 31 (vs. 27-30, mode 28); interorbital width 32.9-38.4% of HL, mean 36.2% (vs. 40.2-47.3%, mean 43.2%); and to a lesser degree, a longer pectoral spine (11.1-14.0% of SL, mean 12.4% vs. 10.0-11.1%, mean 10.5%, respectively). For individuals >20.5 cm SL, T. tropicanus differs from T. tandanus by having more posterior serrae on the pectoral-fin spine (range 12-19, mode 14 vs. 7-11, mode 10).
Tandanus tropicanus can be differentiated from Bellinger catfish by having a larger eye diameter (14.7-18.5% of HL, mean 16.3% vs. 13.2-14.4%, mean 13.8%, respectively), a longer pectoral spine (11.1-14.0% of SL, mean 12.4% vs. 9.8-10.7%, mean 10.4%, respectively) and, to a lesser degree, fewer gill rakers on the first arch (range 31-35, mode 31 vs. 35-39, respectively). It is distinct from T. bostocki by a shorter post-orbital distance (37.4-42.7% of HL, mean 39.5% vs. 46.7-55.9%, mean 51.9%, respectively), a longer snout (44.1-52.3% of HL, mean 48.9% vs. 37.6-42.1%, mean 39.8%, respectively), and, to a lesser degree, a larger eye diameter (14.7-18.5% of HL, mean 16.3% vs. 11.9-15.5%, mean 13.3%, respectively), more rays in the continuous caudodorsal and anal fins (range 150-165, mode 156 vs. 139-149, mode 147, respectively), more gill rakers on the first arch (range 31-35, mode 31 vs. 18-22, mode 21, respectively), and prominent (vs. reduced) posterior serrae on the pectoral-fin spine, respectively (Ref. 96080).
Inhabits coastal rivers (Ref. 96080).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Welsh, S.A., D.R. Jerry and D.W. Burrows, 2014. A new species of freshwater eel-tailed catfish of the genus Tandanus (Teleostei: Plotosidae) from the wet tropics region of Eastern Australia. Copeia 2014(1):136-142. (Ref. 96080)
IUCN Red List Status (Ref. 123251)
CITES (Ref. 123416)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= 0.5625 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00794 (0.00326 - 0.01933), b=3.07 (2.86 - 3.28), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic level (Ref. 69278
): 3.5 ±0.6 se; based on size and trophs of closest relatives
Resilience (Ref. 120179
): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Moderate vulnerability (43 of 100) .