Whale shark - Requin baleine (Rhincodon typus)

Whale shark - Requin baleine (Rhincodon typus), Yucatan peninsula, Mexico. 🐠 🌊 🌏 👉 www.vincentpommeyrol.com
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The whale shark (Rhincodon typus) belongs to the family of Rhincodontidae. It is the biggest present cartilaginous fish on the planet. He arranges a massive body from 3 to 15 meters length for 2 to 12 tons weight (some of them can reach 20 meters for 34 tons). The livery of this fish in checkerboards is very characteristic. The stomach and the bottom of fins is white. His mouth, being able to reach two meters in width is equipped with tiny teeth distributed on 300 rows by jaw. Five pairs of branchiales cracks filter the water to assure its breath. This shark raises two dorsal ailerons and its tail fin is said " hétérocerque ", the upper lobe is more big than the lower lobe.
His geographical distribution includes waters tropical and moderated in hot of the Atlantic Ocean, the Pacific and the Indian Ocean. It is a pelagic species living in the wide in very deep water. However they sometimes group together in shallow water by the hundreds. They migrate on long distances probably for the plankton and changes in water temperature.
The shark-whale feeds on small-sized preys as the plankton, the krill, but also seaweeds, small shellfish and small squids. They filter their food by swimming slowly gaping mouth. Only four species of sharks filter their food, the shark-whale, the megamouth shark, the basking shark and the manta ray.
The mode of reproduction of whale shark is still mysterious. The scientists are not able of defining if the animal is viviparous animal, oviparous or ovoviviparous, although the last mode is favored. The young shark are born formed and measure approximately 45 cms, and it reaches sexual maturity between 20 and 30 years.
Because of his slow cycle of reproduction the shark-whale is threatened by overfishing for his flesh and his fins (the shark finning). He is classified "Vulnerable" by the red list of the UICN.

Le requin-baleine (Rhincodon typus) appartient à la famille des Rhincodontidae. C'est le plus grand poisson cartilagineux présent sur la planète. Il dispose un corps massif de 3 à 15 mètres de longueur pour un poids de 2 à 12 tonnes (certains peuvent atteindre 20 mètres pour 34 tonnes). La livrée de ce poisson en damiers est très caractéristique. Son ventre et la partie inférieure des nageoires est blanche. Sa bouche, pouvant atteindre deux mètres de largeur est équipée de dents minuscules réparties sur 300 rangées par mâchoire. cinq paires de fentes branchiales filtrent l'eau pour assurer sa respiration. Ce requin arbore deux ailerons dorsaux et sa nageoire caudale est dite « hétérocerque », le lobe supérieur est plus grand que le lobe inférieur. Sa répartition géographique comprend les eaux tropicales et tempérées à chaudes de l'Atlantique, du Pacifique et de l'océan Indien. C'est une espèce pélagique vivant au large en eau très profonde. Cependant ils se regroupent parfois en eau peu profonde par centaine d'individus. Ils migrent sur de longues distances probablement pour le plancton et les changements de température de l'eau. Le requin-baleine se nourrit de proies de petite taille comme que le plancton, le krill, mais aussi d'algues, de petits crustacés et petits calmars. Ils filtrent leur nourriture en nageant lentement gueule béante. Seulement quatre espèces de requins filtrent leur nourriture, le requin-baleine, le requin grande-gueule, le requin pèlerin et la raie manta. Le mode de reproduction du requin-baleine est encore mystérieux. Les scientifiques ne sont toujours pas en mesure de définir si l'animal est vivipare, ovipare ou ovovivipare, bien que le dernier mode soit privilégié. Les jeunes naissent formés et mesurent environ 45 cm de long, et il atteint sa maturité sexuelle entre 20 et 30 ans. Du fait de son cycle de reproduction lent le requin-baleine est menacée par la surpêche pour sa chaire et ses ailerons (le shark finning). Il est classé «Vulnérable» par la liste rouge de l' UICN.

Taken in: Mexico / Quintana Roo / Isla Mujeres (show map)

Taken on: January 9, 2012

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Camera: Canon EOS 5D Mark III, f/5.6, 1/90 sec, 18mm, ISO 100 (more info) (hide info)

Camera:	Canon EOS 5D Mark III
Lens:	EF16-35mm f/4L IS USM
Aperture:	f/5.6
Exposure Time:	0.011 sec (1/90)
Focal Length:	18mm
ISO:	100
Exposure Bias:	0 EV
Flash:	Off, Did not fire
Exposure Program:	Program AE
Exposure Mode:	Auto
Metering Mode:	Multi-segment
White Balance:	Auto
Color Space:	Uncalibrated
Software:	Adobe Photoshop Lightroom Classic 12.3 (Macintosh)
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