Holocephali (chimaeras) > Chimaeriformes
(Chimaeras) > Chimaeridae
(Shortnose chimaeras or ratfishes)
Etymology: Hydrolagus: Greek, hydr = water + Greek, lagos = hare (Ref. 45335); bemisi: Named for W.E. Bemisi.
Environment: milieu / climate zone / depth range / distribution range
Marine; bathydemersal; depth range 400 - 1100 m (Ref. 45044), usually 500 - 700 m (Ref. 45044). Deep-water; 0°C -
Southwest Pacific: New Zealand.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 112 cm TL male/unsexed; (Ref. 45044)
Morphology | Morphometrics
Pale brown coloration fading to white ventrally. Dorsal fin spine reaching to origin of second dorsal fin when depressed; elongated second dorsal fin not indented along its length. Horizontal and hyomandibular lateral line canals sharing a common branch. Caudal filament long and stout (Ref. 45044).
Oviparous (Ref. 205). Eggs are encased in horny shells (Ref. 205).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Didier, D.A., 2002. Two new species of chimaeroid fishes from the southwestern Pacific Ocean (Holocephali, Chimaeridae). Ichthyol. Res. 49(4):299-306. (Ref. 45044)
IUCN Red List Status (Ref. 124695)
Threat to humans
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 5.4 - 9.5, mean 7.1 °C (based on 125 cells).
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00380 (0.00194 - 0.00745), b=3.09 (2.91 - 3.27), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245
Trophic level (Ref. 69278
): 3.8 ±0.6 se; based on size and trophs of closest relatives
Resilience (Ref. 120179
): Low, minimum population doubling time 4.5 - 14 years (Assuming Fec <100).
Vulnerability (Ref. 59153
): High vulnerability (61 of 100) .