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Pseudobatos productus (Ayres, 1854)

Shovelnose guitarfish
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Pseudobatos productus
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Classificatie / Names Populaire namen | Synoniemen | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (haaien en roggen) (sharks and rays) > Rhinopristiformes (Shovelnose rays) > Rhinobatidae (Guitarfishes)
  More on author: Ayres.

Environment: milieu / climate zone / depth range / distribution range Ecologie

; marien; brakwater demersaal; diepteverspreiding 1 - 91 m (Ref. 48844), usually 1 - 13 m (Ref. 48844).   Tropical; 38°N - 18°N, 123°W - 106°W (Ref. 114953)

Verspreiding Landen | FAO regio's | Ecosystems | Voorkomen | Point map | Introducties | Faunafri

Eastern Pacific: endemic to the eastern Pacific from San Francisco, USA to the Gulf of California, and possibly to Mazatlan, Mexico (Ref. 48844).

Length at first maturity / Size / Gewicht / Leeftijd

Maturity: Lm ?, range 99 - ? cm
Max length : 119 cm TL mannelijk/geslacht niet bekend; (Ref. 48844); 170.0 cm TL (female); Maximaal gepubliceerd gewicht: 9.8 kg (Ref. 40637); Maximaal gepubliceerd gewicht: 9.8 kg; Maximaal vermelde leeftijd: 16 jaren (Ref. 48844)

Korte beschrijving Morfologie | Morfometrie

Broad disc is greater in length than width; a relatively smooth dorsal surface except for a single row of thorns around the eyes and extending along the back and tail; a long, pointed snout with a rounded tip; small, rounded, pebble-like teeth; a first dorsal fin that originates closer to the pelvic fin base than to the caudal fin origin; a thick tail and a moderately large caudal fin without a distinct lower lobe. Tooth count: 102-112/98-117. Spiral valve count: 8-10.

Biologie     Verklarende woordenlijst (b.v. epibenthic)

Found on sand or mud bottoms of bays, seagrass beds, estuaries, and near rocky reefs. Nomadic and gregarious. Found singly or in aggregations (Ref. 12951). Burrows in sand during the day, feeds on crabs, worms, clams and small fishes at night (Ref. 12951). Ovoviviparous, with 6 to 28 pups in a litter (Ref. 48844). Females mature by 7 years at 87-99 cm TL; males reaches 91-110 cm TL; birth size at 20-24 cm TL (Ref. 114953). Etymology: The genus comes from the Greek word rhine, meaning shark, and the Latin word batis, meaning ray, in reference to its body form being intermediate between that of a shark and a ray. The species name comes Latin, meaning produced, in reference to its pointed snout (Ref. 48844).

Life cycle and mating behavior Geslachtsrijpheid | Voortplanting | Kuitschieten | Eieren | Fecundity | Larven

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). Adults of both sexes congregate during the breeding season in shallow bays and estuaries and likewise leave when the pupping season is over after mating (Ref. 48844). Gestation lasts for about 12 months (Ref. 48844).

Voornaamste referentie Upload your references | Referenties | Coördinator : McEachran, John | Medewerkers

Eschmeyer, W.N., E.S. Herald and H. Hammann, 1983. A field guide to Pacific coast fishes of North America. Boston (MA, USA): Houghton Mifflin Company. xii+336 p. (Ref. 2850)

Status op de Rode Lijst van het IUCN (Ref. 120744)

  Bijna bedreigd (NT) ; Date assessed: 17 December 2014

CITES (Ref. 115941)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Gevaarlijk voor mensen

  Harmless (Ref. 2850)





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Estimates of some properties based on models

Preferred temperature (Ref. 115969): 15.3 - 25.9, mean 22.4 (based on 149 cells).
Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5039   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00295 (0.00163 - 0.00533), b=3.05 (2.89 - 3.21), in cm Total Length, based on LWR estimates for this species & Genus-body shape (Ref. 93245).
Trophic Level (Ref. 69278):  3.6   ±0.3 se; Based on diet studies.
Weerstandsvermogen (Ref. 69278):  laag, minimale populatieverdubbelingstijd 4,5-14 jaar (tm=7; tmax=11; K=0.1; Fec = 6).
Kwetsbaarheid (Ref. 59153):  Very high vulnerability (77 of 100) .
Prijsklasse (Ref. 80766):   Low.