分類 / Names
俗名 | 同種異名 | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Elasmobranchii
板鰓亞綱 (鯊魚與魟魚) (sharks and rays) >
Rajiformes (Skates and rays) >
Arhynchobatidae (Skates)
Etymology: Rioraja: Latin, rivus = river (in Greek, rheo) + Latin, raja, -ae = ray, fish.
環境 / 氣候 / 範圍
生態學
; 海洋 居於水底的; 深度上下限 ? - 130 m (Ref. 26375). , preferred ?
Southwest Atlantic: Espírito Santo, Brazil to Argentina.
Length at first maturity / 大小 / 重量 / 年齡
Maturity: Lm 42.5, range 39 - 45.7 cm
Max length : 33.0 cm WD 雄魚/尚未辨別雌雄; (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).
Life cycle and mating behavior
成熟度 | 繁殖 | 產卵場 | 卵 | 孕卵數 | 仔魚
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)
CITES (Ref. 94142)
Not Evaluated
人類使用
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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).
營養階層 (Ref.
69278): 3.6 ±0.0 se; Based on diet studies.
回復力 (Ref.
69278): 低的, 最小族群倍增時間4.5 - 14 年 (Assuming fecundity<100).
瀕危性 (Ref.
59153): High to very high vulnerability (73 of 100) .
