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Eupercaria/misc (Various families in series Eupercaria) >
Sciaenidae (Drums or croakers)
Eponymy: Rev Dr Christoph Samuel John (1747–1813) was a botanist and herpetologist and a medical missionary (1771–1813) at the Danish trading station of Tranquebar (now Tharangambadi), Tamil Nadu, not far from Madras (Chennai). [...] (Ref. 128868), visit book page.
Environment: milieu / climate zone / depth range / distribution range
Ecologia
marino benthopelagico. Tropical
Indo-Pacific: Thailand and Indonesia.
Size / Peso / Age
Maturity: Lm ?  range ? - ? cm
Max length : 15.0 cm SL maschio/sesso non determinato; (Ref. 9772); common length : 12.0 cm SL maschio/sesso non determinato; (Ref. 9772)
Spine dorsali (totale) : 11; Raggi dorsali molli (totale) : 25 - 29; Spine anali: 2; Raggi anali molli: 7. A small species with a moderately deep body. Light brown dorsally, creamy white ventrally (Ref. 9772).
Inhabits shallow coastal waters (Ref. 9772).
Life cycle and mating behavior
Maturità | Riproduzione | Deposizione | Uova | Fecundity | Larve
Sasaki, K., 1992. Two new and two resurrected species of the sciaenid genus Johnius (Johnius) from the West Pacific. Jap. J. Ichthyol. 39(3):191-199. (Ref. 10084)
IUCN Red List Status (Ref. 130435: Version 2024-1)
Threat to humans
Harmless
Human uses
Pesca: scarso interesse commerciale
Strumenti
Special reports
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Estimates based on models
Preferred temperature (Ref.
123201): 28.2 - 29.3, mean 28.9 °C (based on 366 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00891 (0.00412 - 0.01928), b=3.08 (2.91 - 3.25), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
Trophic level (Ref.
69278): 3.4 ±0.4 se; based on size and trophs of closest relatives
Resilienza (Ref.
120179): Alto, tempo minimo di raddoppiamento della popolazione meno di 15 mesi (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).