Classification / Names
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Teleostei (teleosts) >
Cichliformes (Cichlids, convict blennies) >
Cichlidae (Cichlids) > Cichlinae
Eponymy: Based on a local name for this fish in Mato Grosso, Brazil: ‘johanna guensa’. (Ref. 128868), visit book page.
More on author: Heckel.
Issue
Redescription based on Peruvian material in Kullander (1986: 98) with bibliography, diagnosis, description, distribution, and illustrations. Ploeg (1991: 68) claimed that C. johanna is based on more than one specimen, and designated the only specimen found at NMW as lectotype (NMW 16431).
Environment: milieu / climate zone / depth range / distribution range
Ecology
Freshwater; benthopelagic; pH range: 7.0 - ? ; dH range: 20 - ?. Tropical; 23°C - 26°C (Ref. 2060)
South America: Amazon River basin, widespread in Peru, Brazil and Bolivia; in the Orinoco basin in Colombia and Venezuela; Essequibo drainage in Guyana; Oyapock and Approuague drainages in French Guiana; Amapá, Brazil.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 28.3 cm SL male/unsexed; (Ref. 36377)
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Varella, H.R., S.O. Kullander, N.A. Menezes, C. Oliveira and H. Lopez-Fernandez, 2023. Revision of the generic classification of pike cichlids using an integrative phylogenetic approach (Cichlidae: tribe Geophagini; subtribe Crenicichlina). Zool. J. Linn. Soc. 198(4):982-1034[1-43]. (Ref. 131257)
IUCN Red List Status (Ref. 130435: Version 2024-1)
Threat to humans
Harmless
Human uses
Fisheries: of no interest
Tools
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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=0.00794 (0.00356 - 0.01774), b=3.11 (2.93 - 3.29), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Trophic level (Ref.
69278): 3.1 ±0.48 se; based on food items.
Resilience (Ref.
120179): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (25 of 100).