Comparative morphology and cytology of the eye, with particular reference to the retina, in lizardfishes (Synodontidae, Teleostei)

This study represents the first attempt to describe ultrastructural features of teeth in different three ages of white grouper (Epinephelus aeneus) grossly and by the aid of the electron microscope. The current study depends on 18 oropharyngeal cavity of E. aeneus from each age-stages. There are common and special characterization between each age. Five teeth bands in the roof (incisive, canine, upper molar, palatine, and vomer), while two bands in the floor (incisive, molar). The apical teeth part resembles the arrowhead that bordered by groove distally. In 5 cm age, small upper incisive teeth had two appearance (straight and curved), and vomer teeth arranged in triangular in only one row (while, in 12 cm fish arranged in two rows and in 15 cm fish arranged in more than two rows), the palatine teeth began rostrally as one row then two rows and terminated by one row, while in other two ages began by two, then three and ended by two rows. There is no canine teeth in lower jaw in all age. In 12 cm fish, the rostral row of lower incisive teeth usually contain small straight teeth,

Section: Introductionmentioning

confidence: 99%

Age‐related ultrastructural characterizations of the teeth of the white grouper (Epinephelus aeneus) in the different three age‐stages

Alsafy

Madkour

El‐Bakary

et al. 2021

“…The fish description is an attractive point to most ichthyologists. There are many charming points in describing fish morphology, such as the oropharyngeal cavity (Abumandour et al, 2021; Alsafy, Bassuoni, & Hanafy, 2018; EL Gendy, Alsafy, & Tanekhy, 2016), gills, and their relation to feeding habits (Abumandour, 2016; Abumandour, 2019; Abumandour & El‐Bakary, 2017; Abumandour & Gewaily, 2016; Hanafy, 2020), esophagus (Abumandour & El‐Bakary, 2018), and eye adaptations to different environmental conditions (El‐Bakary & Abumandour, 2017; Fishelson, Delarea, & Goren, 2012).…”

Section: Introductionmentioning

confidence: 99%

Ultrastructural comparison between the oral cavity floor of the juvenile and adult Epinephelus aeneus: New vision of aging development and its carnivorous adaptation

Alsafy

Madkour

El‐Bakary

et al. 2021

The current work is designed to give the first trial to characterize the ultrastructural lineaments of the oral cavity floor in juvenile and adult white grouper. The present work depends on 10 oral cavities floor from each age. The common features joined the oral cavities floor of the juvenile and adult fish summarized in; oral cavity floor had two teeth bands (lower incisive and lower molar), tongue with its two lateral spinated lines, lower velum, ridges, the lower lip divided into a single anterior part and two lateral part, and the absence of lower canine teeth. The oral surface of semilunar lower velum had round fungiform papillae that carried taste buds type I. The non-protrusible elongated tongue had a clear apex, body, and root with the absence of any taste buds. The dorsal lingual surface of the body had two lateral spinated lines, a single ridge and microtubercles. The smooth dorsal lingual surface of the root did not carry any ridges. The notched lower velum at the middle of the free border was observed in juveniles and adults. Meanwhile, there are some variations between juvenile and adult as; absence of lower incisive ridge only in juvenile, pointed tongue with sublingual ridge observed in juvenile while round without sublingual ridge in adult fish, moreover the presence of velvar ridges observed only in adult fish. The obtained findings provided essential data to aquaculture of this fish species in Egypt by determining the food particle types that are favorite to this fish. HighlightsThe common features joined the oral cavities floor of the juvenile and adult fish summarized in; oral cavity floor had two teeth bands (lower incisive and lower molar), tongue with its two lateral spinated lines, lower velum, ridges, the lower lip divided into a single anterior part and two lateral part, and the absence of lower canine teeth. The oral surface of semilunar lower velum had round fungiform papillae that carried taste buds type I. The dorsal lingual surface of the body had two lateral spinated lines, a single ridge and microtubercles. The smooth dorsal lingual surface of the root did not carry any ridges. Meanwhile, there are some variations between juvenile and adult as; absence of lower incisive ridge only in juvenile, pointed tongue with sublingual ridge observed in juvenile while round without sublingual ridge in adult fish, moreover the presence of velvar ridges observed only in adult fish.

“…The eyes of fish are complex organs with various forms and dimensions. The eyeball of many fish species, including the stingray, anglerfish (Demir, 2009), flounder, halibut (Demir, 2009;Ekingen, 2001), winged spookfish (Wagner et al, 1998), Conger eel (Ekingen, 2001), hagfish, cavefish (Kuru, 2011), humpback whale (Rodrigues et al, 2014) Zebrafish (Greiling & Clark, 2008), sardine (Salem, 2016), lizard fish (Fishelson, Delarea, & Goren, 2012), cichlids (Schobert et al, 2013), goby fish (Schmitz & Wainwright, 2011) and marine teleost fish (Darwish, Mohalal, Helal, & El-Sayyad, 2015) has been examined morphologically. In addition, some authors have studied visual adaptations of the eye (El-Bakary & Abumandour, 2017;Wagner et al, 1998), and lens suspension in bony fishes (Khorramshahi, Schartau, & Kröger, 2008) as well as the evaluation and treatment of common ocular disorders in teleost fish (Williams & Whitaker, 1997).…”

mentioning

confidence: 99%

The fine structure of the turbot eye (Scophtalmus maximus): A macro‐anatomical, light and scanning electron microscopical study

Onuk

Pehlivan

Yardımcı

2020

In fish species, the morphological structure of the eye varies depending on environmental conditions. Morphometric data about the sensory organs of fish is lacking.Therefore, this study aims to describe the morphological structure of the turbot eye using gross, light and scanning electron microscope examinations. The turbot eyeball was found to comprise three layers: the tunica fibrosa bulbi (cornea, sclera), the tunica vasculosa bulbi (choroidea, iris) and the tunica nervea bulbi (retina). The thickness of the centre of the cornea measured approximately 153.14 μm, and the peripheral thickness measured 410.81 μm. The sclera consisted of a two-part cartilage structure that was connected with elastic fibres. The choroideal rete was found in the tunica vasculosa bulbi, and its thickness measured 1.6 ± 0.1 mm. Moreover, no pigment was found in the choroidea. The lens was determined to be a very hard and transparent structure extending towards the cornea. In addition, we detected five ligaments in the equatorial plane of the eye, in which the tendon of the retractor lentis muscle attaches to the lens. Also, there were six extraocular muscles in the turbot.This study is the first to present detailed descriptions of morphological structures and morphometric data for all the layers of the turbot eye. Since the anatomical structure of the eye in fish is variable, it is thought that the data on the turbot eye will contribute to the anatomy literature.