Actinopterygii (ray-finned fishes) > Perciformes
(Perch-likes) > Nototheniidae
Etymology: Trematomus: Greek, trematos = hole + Greek, tomo = section, cut (Ref. 45335); hansoni: Named after Nicolai Hanson, biologist of the Southern Cross Expedition (Ref. 11892). More on author: Boulenger.
This species is placed in the genus Pseudotrematomus in Eschmeyer (CofF ver. Sep. 2011: Ref. 88002).
Environment: milieu / climate zone / depth range / distribution range
Marine; demersal; depth range 6 - 549 m (Ref. 11892). Polar; 53°S - 78°S
Southern Ocean: South Orkneys, South Georgia and South Shetland islands. Ross, Davis and Weddell seas, South Victoria, Adelie, Queen Mary and Princess Ragnhild Coasts.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 41.0 cm TL male/unsexed; (Ref. 5179); common length : 25.0 cm TL male/unsexed; (Ref. 2121)
Adults feed on small fishes, krill and other euphausiids, polychaetes, copepods, amphipods, isopods and small gastropods. Mature individuals spawn once a year (Ref. 1071).
Dewitt, H.H., P.C. Heemstra and O. Gon, 1990. Nototheniidae. p. 279-331. In O. Gon and P.C. Heemstra (eds.) Fishes of the Southern Ocean. J.L.B. Smith Institute of Ichthyology, Grahamstown, South Africa. (Ref. 5179)
IUCN Red List Status (Ref. 115185)
CITES (Ref. 115941)
Threat to humans
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Preferred temperature (Ref. 115969
): -1.8 - 0.5, mean -1.1 (based on 348 cells).
Phylogenetic diversity index (Ref. 82805
= 0.5005 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00501 (0.00288 - 0.00873), b=3.23 (3.08 - 3.38), in cm Total Length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245
Trophic Level (Ref. 69278
): 3.4 ±0.54 se; Based on food items.
Resilience (Ref. 69278
): Medium, minimum population doubling time 1.4 - 4.4 years (K=0.22-0.23; Fec = 5,851-12,000).
Prior r = 0.38, 2 SD range = 0.14 - 0.99, log(r) = -0.97, SD log(r) = 0.48, Based on: 3 K, 1 tmax, 9 Fec records
Vulnerability (Ref. 59153
): High to very high vulnerability (66 of 100) .