Classification / Names
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Characiformes (Characins) >
Characidae (Characins; tetras) > Stethaprioninae
Etymology: Astyanax: The name of Astyanax, Hector´s son in the Greek mythology (Ref. 45335); cocibolca: Named for Lake Cocibolca, the indigenous name for Lake Nicaragua; noun in apposition..
Environment: milieu / climate zone / depth range / distribution range
Οικολογία
; Γλυκού νερού Πελαγικό(ά); εύρος βάθους ? - 2 m (Ref. 83537). Tropical
Central America: endemic to Lake Nicaragua.
Μέγεθος / Βάρος / Age
Maturity: Lm ? range ? - ? cm
Max length : 5.4 cm SL αρσενικό/απροσδιόριστο; (Ref. 83537)
Short description
Κλείδες προσδιορισμού | Μορφολογία | Μορφομετρία
The semipelagial Astyanax cocibolca can be readily separated from the A. aeneus that inhabits some of the same habitats in Lake Nicaragua by its slender body 29.1-36.4% SL (vs. 33.9-39.3% SL); with slightly upturned mouth; high total gill raker count 23-34, mean 28.9 (vs. 22-26, mean 24.1); reduced size of dentary teeth; fewer scale rows above lateral line 6-8, mean 7.2 (vs. 8-9, mean 8.3); more intense black midlateral band; smaller size, maximum 54.3 (vs. greater than 80 mm SL); conical teeth in outer row of premaxillary bone (vs. only tricuspid outer row teeth) (Ref. 83537).
This filter-feeding specialist utilizes the open-water habitat, at least as a nursery where young can feed on the rich plankton population. Two small adults from the open water habitat contained 90% copepoda and cladocera while inshore specimens contained 90% fruit, 5% cladocera, 5% seed, algae. The adult female from open water contained ripe eggs, although
10 adult females from inshore sites contained only undeveloped eggs (Ref. 83537).
Life cycle and mating behavior
Maturities | Αναπαραγωγή | Spawnings | Egg(s) | Fecundities | Προνύμφες
Bussing, W.A., 2008. Astyanax cocibolca, a new characid (Pisces: Ostariophysi) from Lake Nicaragua, Central America. Revista de Biologia Tropical 56 (3):1361-1370. (Ref. 83537)
IUCN Red List Status (Ref. 130435)
Threat to humans
Harmless
Human uses
Εργαλεία
Special reports
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Διαδικτυακές πηγές
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=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
Τροφικό Επίπεδο (Ref.
69278): 2.9 ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
