Anatomy and Taxonomy

Mylniczenko, Natalie D.

doi:10.1002/9781119259886.ch1

Cited by 1 publication

(2 citation statements)

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“…An ultrasound scan of the entire coelomic cavity, the diagnosis of pregnancy, and the detailing of the fetus were performed. Anatomical descriptions follow Crow and Brock [ 32 ] and Mylniczenko [ 23 ].…”

Section: Methodsmentioning

confidence: 99%

“…Triaenodon obesus , despite its wide distribution, is assessed as vulnerable due to population decline and habitat loss in many areas of its range [ 20 , 21 ], but gaps in knowledge persist. The whitetip reef shark is a placentotrophic viviparous species, with a matrotrophic nutrition of the fetus [ 22 , 23 ]. That is, T. obesus is a live-bearing shark with the development of the embryo sustained by nutrients produced by the mother and delivered by a placental connection, a feature only identified within five families of Carcharhiniformes (Carcharhinidae, Sphyrnidae, Hemigaleidae, Leptochariidae, and Triakidae) [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

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Courtship and Reproduction of the Whitetip Reef Shark Triaenodon obesus (Carcharhiniformes: Carcharhinidae) in an Ex Situ Environment, with a Description of the Late Embryonic Developmental Stage

Santos

Takatsuka²,

Bonatelli³

et al. 2022

Animals

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Elasmobranchs represent a group of species under considerable anthropic pressure because of the scale of industrial and artisanal fisheries and the loss of essential areas for nursery and feeding, which are causing substantial population losses around the world. Reproduction in an ex situ environment enables a healthy population to be built and maintained in networks of public aquariums, increasing our knowledge of elasmobranch reproductive biology and offering the opportunity for reintroductions in areas where native populations have been removed. The study reports two successful pregnancies of the whitetip reef shark Triaenodon obesus, considered a vulnerable species by the International Union for the Conservation of Nature. Copulation and gestation data are provided, including ultrasound recordings of the late stage of embryo development. Ultrasonography was performed with the GE Logiq and convex transducer and revealed a fetus with defined fins and organogenesis, with definition of eyes, gills, liver, a heart with individualized chambers, partially defined kidneys, and a well-defined spiral intestine. A cartilaginous skeleton forming a posterior acoustic shadow was detailed, as well as a moving fetus with a biparietal diameter of 6.47 cm and a heart rate of 62 Beats Per Minute on spectral Doppler. This is the first successful reproduction of T. obesus in an aquarium in Brazil.

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Section: Methodsmentioning

confidence: 99%