Environment: milieu / climate zone / depth range / distribution range
Ecology
Freshwater; brackish; demersal; amphidromous (Ref. 51243). Tropical; 22°N - 19°N
Oceania: Hawaii. Reported from USA (Ref. 3881).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 33.0 cm SL male/unsexed; (Ref. 44091)
Generally brown to black in color; pelvic fins separate rather than fused into a disc; young fish <2.5 cm long are distinctively jet black on the upper body and lighter on the sides and belly (Ref. 44091).
Body shape (shape guide): elongated.
Found in both altered and unaltered streams, but being unable to climb waterfalls restricts its habitat to the lower reaches of streams and estuaries; can be observed darting into the mud and leaf litter, or sheltering among rocks and cobble, rarely showing in the open; highly predaceous on various invertebrates, e.g. slow-moving thiarid snails and asiatic clams, and fishes; traditionally caught with a baited hook attached to a short stick (fishing method called kiomo'omo); relished as a food item, particularly when wrapped with leaves and roasted; now prized as bait by near-shore papio fisherman (Ref. 44091).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Tinker, S.W., 1978. Fishes of Hawaii, a handbook of the marine fishes of Hawaii and the Central Pacific Ocean. Hawaiian Service Inc., Honolulu. 568 p. (Ref. 583)
IUCN Red List Status (Ref. 130435: Version 2024-2)
Threat to humans
Harmless
Human uses
Fisheries: commercial; bait: usually
Tools
Special reports
Download XML
Internet sources
Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01318 (0.00655 - 0.02653), b=3.19 (3.01 - 3.37), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref.
93245).
Trophic level (Ref.
69278): 3.9 ±0.3 se; based on size and trophs of closest relatives
Resilience (Ref.
120179): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low to moderate vulnerability (30 of 100).
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