Elasmobranchii (sharks and rays) > Carcharhiniformes
(Ground sharks) > Triakidae
(Houndsharks) > Galeorhininae
Etymology: Hemitriakis: Greek, hemi = half + Greek, triakis = three times (Ref. 45335); indroyonoi: Named for Dr. Indroyono Soesilo, who has provided a great deal of support for shark research in Indonesia and was a strong advocate for the production of the field guide to sharks and rays of
Indonesia (White et al., 2006).
Environment: milieu / climate zone / depth range / distribution range
Marine; demersal. Tropical; 9°N - 8°N, 115°E - 117°E
Indian Ocean: eastern Indonesia (Ref. 80994) and India (Ref. 118627).
Length at first maturity / Size / Weight / Age
Maturity: Lm ?, range 90 - ? cm
Max length : 120 cm TL male/unsexed; (Ref. 123599)
Presumably occurring on the outer continental shelf and upper slope. Females have litters of 6-11 where reproductive mode is viviparous, with histotrophy (no yolk-sac placenta); size at birth about 28- 30 cm TL (Ref. 80994).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
White, W.T., L.J.V. Compagno and Dharmadi, 2009. Hemitriakis indroyonoi sp. nov., a new species of houndshark from Indonesia (Carcharhiniformes: Triakidae). Zootaxa 2110:41-57. (Ref. 80994)
IUCN Red List Status (Ref. 123251)
CITES (Ref. 123416)
Threat to humans
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= 0.5156 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00331 (0.00170 - 0.00646), b=3.03 (2.85 - 3.21), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245
Trophic level (Ref. 69278
): 4.3 ±0.5 se; based on size and trophs of closest relatives
Resilience (Ref. 120179
): Low, minimum population doubling time 4.5 - 14 years ().
Vulnerability (Ref. 59153
): High vulnerability (61 of 100) .