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Rhinoptera javanica, Flapnose ray : fisheries, gamefish
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Rhinoptera javanica
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Elasmobranchii (sharks and rays) >
Myliobatiformes
(Stingrays) >
Rhinopteridae
(Cownose rays)
Etymology:
Rhinoptera:
Greek, rhinos = nose + Greek,pteron = fin, wing (Ref.
45335
)
.
More on authors:
Müller
&
Henle
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; brackish; reef-associated. Tropical; 30°N - 15°S, 55°E - 135°E (Ref.
114953
)
Indo-West Pacific: Oman to the Philippines; north to Ryukyu Is.; south to eastern Indonesia.
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 165 cm WD male/unsexed; (Ref.
114953
); max. published weight: 4.5 kg (Ref.
3965
)
Double-lobed snout and indented forehead; jaws usually with 7 rows of plate-like teeth; no caudal fin (Ref.
5578
). Brown above, white below (Ref.
5578
).
Found in bays, estuaries, and near coral reefs (Ref.
12951
), over sand and mud bottoms (Ref.
9710
). Usually solitary or in small aggregations (Ref.
114953
). However, large schools with up to 500 individuals have been reported (Ref.
12951
). Feeds on clams, oysters and crustaceans (Ref.
12951
). Lives to over 2 years in captivity (Ref.
12951
). Ovoviviparous (Ref.
50449
). Edible (Ref.
30573
). Caught mainly by gill net fisheries (Ref.
114953
), occasionally by bottom trawl, demersal inshore gillnet and tangle net fisheries. Utilized for its meat (Ref.
58048
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Males court by nipping the female's dorsum. Mating pair orient in a venter to venter position, and the male inserts one or both claspers. The pair usually rests on the substrate, with the female on top of the male. Mating lasts about 30 seconds (Ref.
12951
) to 1 minute (Ref.
49562
). Exhibit ovoviparity (aplacental viviparity), with embryos feeding initially on yolk, then receiving additional nourishment from the mother by indirect absorption of uterine fluid enriched with mucus, fat or protein through specialised structures (Ref.
50449
). Size at birth ~60 cm WD. One large pregnant female (~130 cm WD) contained a single late-term embryo 61 cm WD (Ref.58048).
Last, P.R., W.T. White, M.R. de Carvalho, B. Séret, M.F.W. Stehmann and G.J.P. Naylor
, 2016. Rays of the world. CSIRO Publishing, Comstock Publishing Associates. i-ix + 1-790. (Ref.
114953
)
IUCN Red List Status (Ref.
130435
)
Endangered (EN)
(A2cd); Date assessed:
27 May 2020
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless (Ref.
12484
)
Human uses
Fisheries: commercial; gamefish: yes
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Estimates based on models
Preferred temperature (Ref.
123201
): 24.2 - 29.2, mean 28.4 °C (based on 3123 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5039 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01122 (0.00647 - 0.01946), b=2.94 (2.78 - 3.10), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245
).
Trophic level (Ref.
69278
): 3.5 ±0.24 se; based on food items.
Resilience (Ref.
120179
): Very Low, minimum population doubling time more than 14 years (Fec=1-2).
Fishing Vulnerability (Ref.
59153
): Very high vulnerability (85 of 100).
Price category (Ref.
80766
):
Medium
.
Nutrients (Ref.
124155
): Calcium = 5.55 [0.68, 83.89] mg/100g; Iron = 0.366 [0.030, 4.005] mg/100g; Protein = 20.9 [15.6, 26.2] %; Omega3 = 0.0676 [, ] g/100g; Selenium = 30.8 [5.7, 156.0] μg/100g; VitaminA = 18.7 [1.7, 205.1] μg/100g; Zinc = 0.824 [0.056, 9.302] mg/100g (wet weight);
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