Ontogeny of digestive organs during early developmental stages of the tropical whitespotted bamboo shark,<i>Chiloscyllium plagiosum</i>– a histological study

Cartilaginous fish have a comparatively short intestine known as the spiral intestine that is comprised of a helical spiral of intestinal mucosa. However, morphological and functional development of the spiral intestine is not well described. Unlike teleosts, cartilaginous fish are characterized by an extremely long developmental period in ovo or in utero for example; in the oviparous cloudy catshark (Schyliorhinus torazame), the developing fish remains inside the egg capsule for up to six months, suggesting that the embryonic intestine may become functional prior to hatch. In the present study, we describe the morphological and functional development of the spiral intestine in the developing catshark embryo. Spiral formation of embryonic intestine was completed at the middle of stage 31, prior to “pre-hatching”, which is a developmental event characterized by the opening of egg case occurring at the end of the first third of development. Within 48 hours after pre-hatching event, egg yolk began to flow from the external yolk sac into the embryonic intestine via the yolk stalk. At the same time, there was a rapid increase in mRNA expression of the peptide transporter pept1 and neutral amino acid transporter slc6a19. Secondary folds in the intestinal mucosa and microvilli on the apical membrane appeared after pre-hatching, further supporting the onset of nutrient absorption in the developing intestine at this time. We demonstrate the acquisition of intestinal nutrient absorption at the pre-hatching stage of an oviparous elasmobranch.

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Morphological and functional development of the spiral intestine in cloudy catshark (Scyliorhinus torazame)

Honda

Takagi

Wong

et al. 2020

Journal of Experimental Biology

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Macro and microscopical observations of a blue shark, Prionace glauca (Elasmobranchii: Carcharhiniformes), diprosopus embryo from South Atlantic Ocean

Melo,

Calenzani,

Rêgo

et al. 2024

Braz. J. Biol.

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A case of diprosopia anomaly in a blue shark (Prionace glauca) embryo from the South Atlantic Ocean is described. A detailed morphological description of internal organs was provided. The sample came from a pregnant female caught near Trindade Island (19°29'30”S, 028°20’00”W) in Southeast Brazil, with three normal embryos and one with external morphological abnormalities. The anomalous embryo was a male, with deformities in the skull and curvature of the spinal column twisted from the end of the first dorsal fin to the end of the caudal fin in a counterclockwise direction. Furthermore, two faces were observed, the right one with few alterations, while the left one was fused to it, with deformations in the eyes, mouth and nostril. The stomach was the only organ to show alteration in its shape, macroscopically. Organs of the digestive tract, renal structures and rectal gland was analyzed microscopically, and no alteration were observed in the samples. This is the first description of the internal organ of a specimen with diprosopia. These results suggest that, in addition to other factors, the survival of the embryo could be related to their ability to feed and escape predators in case to survive birth.

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Ontogeny of digestive organs during early developmental stages of the tropical whitespotted bamboo shark,Chiloscyllium plagiosum– a histological study

Abstract: 2015) Ontogeny of digestive organs during early developmental stages of the tropical whitespotted bamboo shark, Chiloscyllium plagiosum -a histological study, Marine and Freshwater Behaviour and Physiology, 48:4,[253][254][255][256][257][258][259][260][261][262][263][264][265][266]

Cited by 2 publications

References 31 publications

Morphological and functional development of the spiral intestine in cloudy catshark (Scyliorhinus torazame)

Morphological and functional development of the spiral intestine in cloudy catshark (Scyliorhinus torazame)

Macro and microscopical observations of a blue shark, Prionace glauca (Elasmobranchii: Carcharhiniformes), diprosopus embryo from South Atlantic Ocean

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