Classification / Names
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Characiformes (Characins) >
Characidae (Characins; tetras) > Stevardiinae
Etymology: Knodus: Greek, knodon, -ontos = knife, sword (Ref. 45335); tiquiensis: Named for its type locality, Rio Tiquié..
Environment: milieu / climate zone / depth range / distribution range
বাস্তুসংস্থান
; স্বাদু পানি সমুদতলে ভাসমান বেনথোপেলাজিক. Tropical
South America: known only from the upper Rio Tiquié basin, upper Rio Negro basin in Brazil.
আকৃতি / ওজন / Age
Maturity: Lm ? range ? - ? cm
Max length : 7.3 cm SL পুরুষ/ লিঙ্গ অনিধর্ারিত ; (Ref. 75965)
Short description
সনাক্তকারী নির্দেশক | বহিঃ অঙ্গ সংস্থান | মরফোমেট্রিক্স
পৃষ্ঠীয় নরম পাখনা দন্ড (মোট ) : 10; পায়ূর নরম পাখনা্তুন্ড: 21 - 23; কশেরুকা : 38. Distinguished from all other species of Knodus by the presence of thickened skin forming folds covering the basal portion of the six anteriormost branched anal-fin rays and its interradial membrane. Differs also uniquely among its congeners by having the six anteriormost branched rays associated with more developed skin considerably thicker than that on the remaining anal-fin rays. Can be differentiated also from all congeners, except Knodus meridae, by the low number of branched anal-fin rays (14-16 vs. more than 17), by the presence of relatively compressed teeth (vs. teeth bulky in remaining Knodus and Bryconamericus species, with the exception of Bryconamericus deuteronoides), and the presence of a broad, silvery-gray midlateral stripe (midlateral stripe in remaining Knodus and Bryconamericus species relatively narrow) (Ref. 75965).
Found only in areas of moderate to strong current and present even in the torrential flow of waterfalls. Juveniles measuring up to 2.4 cm SL occur at sandbars marginal to waterfall pools. Feeds only on Chironomidae larvae based on 3 stomach contents (Ref. 75965).
Life cycle and mating behavior
Maturities | প্রজনন | Spawnings | Egg(s) | Fecundities | শুককীট
Ferreira, K.M. and F.C.T. Lima, 2006. A new species of Knodus (Characiformes: Characidae) from the Rio Tiquié, upper Rio Negro System, Brazil. Copeia 2006(4):630-639. (Ref. 75965)
IUCN Red List Status (Ref. 130435)
Threat to humans
Harmless
Human uses
হাতিয়ার
Special reports
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ইন্টারনেট সুত্র
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).
ট্রফিক পর্যায়ে (Ref.
69278): 3.0 ±0.4 se; based on size and trophs of closest relatives
স্থিতিস্থাপক (Ref.
120179): উচ্চ, সর্বনিম্ন প্রজন দ্বিগুনের সময় ১৫ মাস (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
