Actinopterygii (ray-finned fishes) > Perciformes
(Perch-likes) > Gerreidae
Etymology: Gerres: Latin, gerres = a kind of anchovies; cited by Plinius. More on author: Regan.
Environment: milieu / climate zone / depth range / distribution range
Marine; brackish; benthopelagic. Subtropical; 11°S - 36°S, 24°E - 51°E
Western Indian Ocean: southern Mozambique to Algoa Bay, South Africa; also reported from Madagascar.
Length at first maturity / Size / Weight / Age
Maturity: Lm 14.0  range ? - ? cm
Max length : 30.0 cm TL male/unsexed; (Ref. 5213); common length : 20.0 cm TL male/unsexed; (Ref. 3409)
soft rays: 7. Silvery in color but olive brown above; brown stripes following scale rows above lateral line and the 4 rows below it; spinous dorsal fin with black margins (Ref. 4372). Squamation pattern on the preopercular flange 5-17 scales (Ref. 41102).
Adults inhabit coastal waters including estuaries. They form schools (Ref. 5213). They feed on invertebrates (Ref. 3409). Fry about 10 cm in length enter the estuaries and stay until they reach maturity (Ref. 34363).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Woodland, D.J., 1986. Gerreidae. p. 608-609. In M.M. Smith and P.C. Heemstra (eds.) Smiths' sea fishes. Springer-Verlag, Berlin. (Ref. 4372)
IUCN Red List Status (Ref. 123251)
CITES (Ref. 118484)
Threat to humans
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 23.8 - 27.7, mean 26.3 °C (based on 68 cells).
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01820 (0.00954 - 0.03470), b=3.04 (2.88 - 3.20), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref. 93245
Trophic level (Ref. 69278
): 3.6 ±0.59 se; based on food items.
Resilience (Ref. 120179
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low to moderate vulnerability (26 of 100) .