Teleostei (teleosts) >
Anguilliformes (Eels and morays) >
Muraenidae (Moray eels) > Muraeninae
Etymology: Gymnothorax: Greek, gymnos = naked + Greek, thorax, -akos = breast (Ref. 45335); castlei: Named after Peter H.J. Castle, anguilliform expert.
Eponymy: Dr Peter Henry John Castle (1934–1999) was an ichthyologist at the School of Biological Sciences, Victoria University, Wellington, New Zealand, which awarded all his degrees; bachelor’s (1955) master’s (1958), doctorate (1964) and DSc. [...] (Ref. 128868), visit book page.
More on authors: Böhlke & Randall.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; reef-associated; depth range 18 - 21 m (Ref. 35991). Tropical; 32°N - 26°S, 90°E - 174°W
Indo-West Pacific: Philippines, Indonesia, and on the Great Barrier Reef of Australia.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 22.9 cm TL male/unsexed; (Ref. 35991); 25.0 cm TL (female)
Short description
Identification keys | Morphology | Morphometrics
Vertebrae: 118 - 124. Moderately small species with uniform tan or brown coloration, marked with small black spots forming lines on head and a single row of spots and dashes along the lateral midline of the body and tail; body moderately elongate; anus well before midbody; head and jaws short; teeth numerous, short and rounded, maxillary and vomerine teeth biserial; MVF 5-48-120.
Body shape (shape guide): eel-like.
Minimum depth from Ref. 58018. Secretive in reef crevices, not usually seen in the open (Ref 90102).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Böhlke, E.B. and J.E. Randall, 1999. Gymnothorax castlei, a new species of Indo-Pacific moray eel (Anguilliformes: Muraenidae). Raffles Bull. Zool. 47(2):549-554. (Ref. 35991)
IUCN Red List Status (Ref. 130435: Version 2025-2)
Threat to humans
Harmless
Human uses
Fisheries: minor commercial
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