Porogadus gracilis (Günther, 1878)
Cavernous assfish

Family:  Ophidiidae (Cusk-eels), subfamily: Neobythitinae
Max. size:  22.9 cm TL (male/unsexed)
Environment:  bathydemersal; marine; depth range 2500 - 4810 m
Distribution:  Indo-West Pacific: off East Africa; Australia, and Papua New Guinea.
Diagnosis:  This species is distinguished by the following characters: precaudal vertebrae 16-18; first gill arch with long gill rakers 13-17; pectoral-fin rays 16-18; HL:HD 1.73-2.01; most head spines are weak, present on ethmoidal, lacrimal (ridge), prefrontal, interorbital, sphenotic, outer posttemporal, inner preopercular rim and absent on supraorbital, 5th infraorbital, supratemporal, inner posttemporal, outer preopercular rim; opercular spine sharp and extruding; opercular flap small; lower lateral line pores until beginning of anal fin 23; moderately broad dentition patch on vomer with 2-5 rows of teeth and on palatines 3-5 rows of teeth; otolith with single colliculum; OL:OH = 1.3; OL:TCL = 2.45 (Ref. 125143).
Biology:  Rare species, known from a depth of 2.560 m (Ref. 34024). Reproductive strategy possibly similar to other members of this family featuring oviparity, with oval pelagic eggs floating in a gelatinous mass (Ref. 205).
IUCN Red List Status: Data deficient (DD); Date assessed: 15 August 2019 Ref. (130435)
Threat to humans:  harmless


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