Holocephali (chimaeras) > Chimaeriformes
(Chimaeras) > Chimaeridae
(Shortnose chimaeras or ratfishes)
Etymology: Hydrolagus: Greek, hydr = water + Greek, lagos = hare (Ref. 45335). More on author: Fowler.
Environment: milieu / climate zone / depth range / distribution range
Marine; bathydemersal; depth range 25 - 950 m (Ref. 26346), usually 100 - 600 m (Ref. 89422). Deep-water; 34°S - 47°S
Southwest Pacific: endemic to New Zealand.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 96.0 cm TL male/unsexed; (Ref. 26346); common length : 55.0 cm TL male/unsexed; (Ref. 9258)
Morphology | Morphometrics
Inhabits the outer continental shelf and upper slope (Ref. 26346). Feeds on crustaceans, shellfish, worms and small fish (Ref. 26346). Maximum length 87 cm without tail filament (Ref. 26346), assumed to have 96 cm TL. Marketed as fillets (Ref. 26346).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Oviparous, young hatch from egg case at about 9-12 cm (Ref. 26346).
Cox, G. and M. Francis, 1997. Sharks and rays of New Zealand. Canterbury Univ. Press, Univ. of Canterbury. 68 p. (Ref. 26346)
IUCN Red List Status (Ref. 123251)
CITES (Ref. 123416)
Threat to humans
Fisheries: minor commercial
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 8 - 13.7, mean 10.8 °C (based on 62 cells).
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00251 (0.00123 - 0.00512), b=3.14 (2.96 - 3.32), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245
Trophic level (Ref. 69278
): 3.5 ±0.46 se; based on food items.
Resilience (Ref. 120179
): Low, minimum population doubling time 4.5 - 14 years (Assuming Fec <100).
Prior r = 0.28, 95% CL = 0.16 - 0.49, Based on 1 stock assessment.
Vulnerability (Ref. 59153
): Moderate to high vulnerability (54 of 100) .