Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Ophidiiformes
(Cusk eels) > Bythitidae
(Viviparous brotulas) > Bythitinae
Etymology: Saccogaster: Latin, sacculus = small bag + Greek, gaster = stomach (Ref. 45335); nikoliviae: Named for the senior author’s grandchildren, Nikolaj and Olivia.
Environment / Climate / Range
Marine; bathydemersal; depth range ? - 407 m (Ref. 93007). Tropical, preferred ?
Eastern Indian Ocean: Australia.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 5.0 cm SL male/unsexed; (Ref. 93007); 6.9 cm SL (female)
Morphology | Morphometrics
soft rays: 48 - 52;
Vertebrae: 52 - 53. This species is distinguished from its congeners by having predorsal scales and by the following set of characters: pair of frontal spines above and behind eyes is more or less distinct and a median, sub-dermal, cartilaginous, ethmoidal spine in front of eyes; numerous neuromasts found below translucent head-skin arranged in four distinct clusters; with scales on body; anterior arch with 3 long gill rakers, 3-5 times length of filaments; prolonged pectoral peduncle; palatines with 2- tooth rows; lower angle of preoperculum with an antero-ventrally directed spine; vertebrae, precaudal 12-13, total 52-53; fin rays, D 80-84, A 48-52, pectoral 17-18; otolith length to height, 1.9, otolith length to colliculum length, 2.8-3.1 (Ref. 93007).
This viviparous species occurs on the upper continental slope. Female specimens have extended ovaries and eggs up to 0.5 mm in diameter; no embryos were observed. A 5.0 cm SL male paratype had a ripe testes and well developed intromittent organ (Ref. 93007).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Nielsen, J.G., W. Schwarzhans and D.M. Cohen, 2012. Revisions of Hastatobythites and Saccogaster (Teleostei, Bythitidae) with three new species and a new genus. Zootaxa 3579:1-36. (Ref. 93007)
IUCN Red List Status (Ref. 109396)
CITES (Ref. 94142)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5039 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), based on all LWR estimates for this body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.3 ±0.5 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low vulnerability (13 of 100) .