Ikan bertulang rawan (sharks and rays) >
Rajiformes (Skates and rays) >
Arhynchobatidae (Skates)
Etymology: Rioraja: Latin, rivus = river (in Greek, rheo) + Latin, raja, -ae = ray, fish.
Lingkungan / Klimat / Range
Ekologi
; laut dasar (demersal); kisaran kedalaman ? - 130 m (Ref. 26375). Subtropical, preferred ?
Southwest Atlantic: Espírito Santo, Brazil to Argentina.
Length at first maturity / Size / Weight / umur
Maturity: Lm 42.5, range 39 - 45.7 cm
Max length : 33.0 cm WD jantan/; (Ref. 26408)
A coastal species found on sand, mud or gravel bottoms (Ref. 26375). Feeds on crustaceans, mollusks and fishes (Ref. 26375). Oviparous (Ref. 50449). Eggs have horn-like projections on the shell (Ref. 205).
Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref. 50449).
McEachran, J.D. and K.A. Dunn, 1998. Phylogenetic analysis of skates, a morphologically conservative clade of elasmobranchs (Chondrichthyes: Rajidae). Copeia 1998(2):271-290. (Ref. 27314)
Status IUCN Red List (Ref. 115185)
CITES (Ref. 94142)
Not Evaluated
ancaman kepada manusia
Harmless
penggunaan manusia
informasi lanjut
AcuanBudidaya airprofil budidaya airStrainGenetikaFrekuensi alelDiturunkanPenyakit-penyakitPengolahanMass conversion
mitraGambarStamps, CoinsSuara-suaraCiguateraKecepatanTipe renangArea insangOtolithsOtakPenglihatan / visi
Alat, peralatan
laporan khas
muat turun XML
Sumber internet
Estimates of some properties based on models
Phylogenetic diversity index (Ref.
82805): PD
50 = 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00479 (0.00301 - 0.00762), b=3.03 (2.90 - 3.16), in cm Total Length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245).
Trophic Level (Ref.
69278): 3.6 ±0.0 se; Based on diet studies.
Daya lenting (Ref.
69278): Rendah, Waktu penggandaan populasi minimum 4.5 - 14 tahun (Assuming fecundity<100).
keancaman (Ref.
59153): High to very high vulnerability (73 of 100) .
