Ultrastructure features of the surface of the gills and the lower pharyngeal jaw of the Tilapia Zilli, redbelly tilapia (Coptodon Zillii, Gervais, 1848)

Abstract

The present investigation was designed to describe the surface ultrastructure of the gill system of tilapia Zilli. The gill system is formed from four gill arches and each gill arch carries a row of gill filaments on its convex border and two rows of the gill rakers on its concave border. The quadrilateral interbranchial septum has elevated part at the level of the third gill arch. By SEM observations, the gill arch was divided into three regions: rostral, middle and caudal region. The caudal region contained two characteristic structures: oval leaf‐like structure and rounded‐shaped structure. Each oval leaf‐like structure carried two lateral rows of the triangular pointed spines separated by a median groove. All surfaces of gill arches, rakers and filaments were covered with a mosaic of the polygonal pavement cells, in addition to the opening of chloride cells and mucous cells. The gill arch and gill raker had only one appearance of taste buds named type I. Meanwhile, the filaments contained two types of different appearance of the taste buds named: type I and type II. Type I was the main common and similar to that present in gill arch and raker and characterized by its blunt end, while type II had hair‐like structures that projected from the volcano‐shaped depression. The gill rakers were formed from central axis surrounded by two lateral lobulated regions which carry pointed spines, taste buds and the opening of chloride cells. The surface of triangular lower pharyngeal jaw carries numerous teeth‐like papillae which originated from the socket‐like depression.

An ultrastructural focus on the buccal cavity of the grey gurnard Eutrigla gurnardus (Linnaeus, 1758): Adaptative dietary implications

“…The observed upper velum act as a valve regulating the water passage into the buccal cavity as reported in the previously published data (Abumandour, 2019; Abumandour & El‐Bakary, 2017; Abumandour & Gewaily, 2016; Alsafy et al, 2021; Coxon & Davison, 2011; El Bakary, 2012; El‐Gendy et al, 2016; Fishelson et al, 2004; Fishelson et al, 2012; Fishelson & Delarea, 2004; Nandi & Saikia, 2021; Yashpal et al, 2006; Yashpal et al, 2009). The current description of the upper and lower velum as the semilunar thin membrane was similar to that reported in different fish‐species of the different feeding habits (Alsafy et al, 2021; El Bakary, 2012; El Bakary, 2014; El‐Gendy et al, 2016; Fishelson et al, 2004; Fishelson et al, 2012; Fishelson & Delarea, 2004; Yashpal et al, 2006; Yashpal et al, 2009).…”

“…The buccal cavity is the gait for the entrance of all nutrients into the fish body and it is therefore important to understand the functions and limitations in processing capacity during early life stages. The oral cavity of fish had an important role in the seizure or prey capturing, selection of food particles and rejection of undesirable items, food processing, and swallowing (Abbate et al, 2006; Abumandour, 2019; Atkinson & Collin, 2012; Canan, Nascimento, Silva, & Chellappa, 2012; Fishelson, Baldwin, & Hastings, 2012; Fishelson, Delarea, & Zverdling, 2004; Horn, 1998; Kapoor & Khanna, 1994; Kapoor, Smit, & Verighina, 1976). According to the previously published data, the oral cavity of different fish‐species had more attention in the past depending on light microscopic examination only (Horn, 1998; Kapoor & Khanna, 1994), while the SEM examinations of the oral cavity were recorded in different fish‐species of different habits as in carnivorous fish (Bishop & Odense, 1966; Cataldi, Cataudella, Monaco, Rossi, & Tancioni, 1987), plankton feeder fish (Nandi & Saikia, 2021; Sinha & Chakrabarti, 1985), herbivorous fish (Atkinson & Collin, 2012; El Bakary, 2011; El Bakary, 2012; Yashpal, Kumari, Mittal, & Mittal, 2009).…”

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

“…Generally, the fish is an attracted point for some scientists because of special habits and habitats in several aquatic conditions (Abumandour, 2019; Abumandour & Gewaily, 2016; Yashpal, Kumari, Mittal, & Kumar, 2006). The most numerous points attracted the researchers in the fish were the structures concerning to the feeding habits, reproduction and migrations such as; oropharyngeal cavity (EL Gendy, Alsafy, & Tanekhy, 2016), gills (Abumandour, 2016; Abumandour, 2019; Abumandour & El‐Bakary, 2017; Abumandour & Gewaily, 2016; Alsafy, 2013; Kumari, Mittal, & Mittal, 2012), and eye conditions (Donatti & Fanta, 1999; El‐Bakary & Abumandour, 2017; Fishelson, Delarea, & Goren, 2012; Reckel, Melzer, Parry, & Bowmaker, 2002) and their environmental adaptations with the different available feeding habits of the different fish species.…”

Morphological studies on the gills of the European hake (Merluccius merluccius, Linnaeus, 1758)

“…Many articles were recorded on the morphology of the gills in different fish species (Abumandour, , ; Abumandour & El‐Bakary, ; Abumandour & Gewaily, ; Alsafy, ; Díaz, Castro, García, de Astarloa, & Figueroa, ; Eiras‐Stofella, ; Eiras‐Stofella & Charvet‐Almeida, , ; Eiras‐Stofella & Fank‐de‐Carvalho, ; Lewis & Potter, ; Zayed & Mohamed, ), but the morphological characters of M. merluccius gills is out of focus so we will focus on it.…”