Functional morphology of the olfactory organ of two carcharhinid shark species

1987 ◽  
Vol 65 (10) ◽  
pp. 2406-2412 ◽  
Author(s):  
Eckart Zeiske ◽  
Birgit Theisen ◽  
Samuel H. Gruber
Keyword(s):  
Ventral Side ◽  
Sensory Epithelium ◽  
Shark Species ◽  
Basal Cells ◽  
Lemon Shark ◽  
Negaprion Brevirostris ◽  
Receptor Cells ◽  
Silky Shark ◽  
Inlet Chamber ◽  
Outlet Chamber

The paired olfactory organs of both the lemon shark (Negaprion brevirostris) and the silky shark (Carcharhinus falciformis) are located in solid cartilaginous nasal capsules, which open at the ventral side of the snout and are entirely separate from the mouth. The olfactory rosette consists of two rows of lamellae arising from a central raphe. The lamellae possess secondary folds covered with sensory epithelium, which contains microvillous receptor cells, supporting cells with both cilia and microvilli, basal cells, and goblet cells. No ciliated receptor cells were found. Gaps between facing lamellae connect the inlet chamber with the outlet chamber. The inlet chamber receives the ventilatory water through the incurrent nostril and the outlet chamber discharges the water through the excurrent nostril. A nasal flap, a septum, and paired valve flaps form an incomplete barrier between incurrent and excurrent nostrils and may have hydrodynamic functions, which are discussed.

scholarly journals Description of the microbiota in epidermal mucus and skin of sharks (Ginglymostoma cirratum and Negaprion brevirostris) and one stingray (Hypanus americanus)

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e10240
Author(s):  
Susana Caballero ◽  
Ana Maria Galeano ◽  
Juan Diego Lozano ◽  
Martha Vives
Keyword(s):  
Microbial Communities ◽  
Pathogenic Bacteria ◽  
Rrna Gene ◽  
Shark Species ◽  
Lemon Shark ◽  
Skin Mucus ◽  
Negaprion Brevirostris ◽  
Opportunistic Bacteria ◽  
Ginglymostoma Cirratum ◽  
Skin Samples

Skin mucus in fish is the first barrier between the organism and the environment but the role of skin mucus in protecting fish against pathogens is not well understood. During copulation in sharks, the male bites the female generating wounds, which are then highly likely to become infected by opportunistic bacteria from the water or from the male shark’s mouth. Describing the microbial component of epithelial mucus may allow future understanding of this first line of defense in sharks. In this study, we analyzed mucus and skin samples obtained from 19 individuals of two shark species and a stingray: the nurse shark (Ginglymostoma cirratum), the lemon shark (Negaprion brevirostris) and the southern stingray (Hypanus americanus). Total DNA was extracted from all samples, and the bacterial 16S rRNA gene (region V3-V4) was amplified and sequenced on the Ion Torrent Platform. Bacterial diversity (order) was higher in skin and mucus than in water. Order composition was more similar between the two shark species. Alpha-diversities (Shannon and Simpson) for OTUs (clusters of sequences defined by a 97% identity threshold for the16S rRNA gene) were high and there were non-significant differences between elasmobranch species or types of samples. We found orders of potentially pathogenic bacteria in water samples collected from the area where the animals were found, such as Pasteurellales (i.e., genus Pasteurella spp. and Haemophilus spp.) and Oceanospirillales (i.e., genus Halomonas spp.) but these were not found in the skin or mucus samples from any species. Some bacterial orders, such as Flavobacteriales, Vibrionales (i.e., genus Pseudoalteromonas), Lactobacillales and Bacillales were found only in mucus and skin samples. However, in a co-occurrence analyses, no significant relationship was found among these orders (strength less than 0.6, p-value > 0.01) but significant relationships were found among the order Trembayales, Fusobacteriales, and some previously described marine environmental Bacteria and Archaea, including Elusimicrobiales, Thermoproteales, Deinococcales and Desulfarculales. This is the first study focusing on elasmobranch microbial communities. The functional role and the benefits of these bacteria still needs understanding as well as the potential changes to microbial communities as a result of changing environmental conditions.

scholarly journals Histological, Topographical and Ultrastructural Organization of Different Cells Lining the Olfactory Epithelium of Red Piranha, Pygocentrus nattereri (Characiformes, Serrasalmidae)

2016 ◽  
Vol 50 (5) ◽  
pp. 447-456 ◽  
Author(s):  
S. K. Ghosh ◽  
P. Chakrabarti
Keyword(s):  
Olfactory Epithelium ◽  
Secretory Granules ◽  
Sensory Epithelium ◽  
Sensory Cells ◽  
Ultrastructural Organization ◽  
Basal Cells ◽  
Mucous Cells ◽  
Supporting Cells ◽  
Receptor Cells ◽  
Pygocentrus Nattereri

Abstract The structural characterization of the olfactory epithelium in Pygocentrus nattereri Kner, 1858 was studied with the help of light as well as scanning and transmission electron microscope. The oval shaped olfactory rosette consisted of 26–28 primary lamellae radiated from midline raphe. The olfactory epithelium of each lamella was well distributed by sensory and non-sensory epithelium. The sensory epithelium contained morphologically distinct ciliated and microvillous receptor cells, supporting cells and basal cells. The non-sensory epithelium was made up of labyrinth cells, mucous cells and stratified epithelial cells. According to TEM investigation elongated rod emerging out from dendrite end of the receptor cells in the free space. The dendrite process of microvillous receptor cells contained microvilli. The supporting cells had lobular nucleus with clearly seen electron dense nucleolus. The apex of the ciliated non-sensory cells was broad and provided with plenty of kinocilia. Basal cells provided with oval nucleus and contained small number of secretory granules. The mucous cells were restricted to the non-sensory areas and the nuclei situated basally and filled with about two-third of the vesicles. The functional significance of various cells lining the olfactory epithelium was discussed with mode of life and living of fish concerned.

scholarly journals Aerial Survey as a Tool to Estimate Abundance and Describe Distribution of a Carcharhinid Species, the Lemon Shark,Negaprion brevirostris

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
S. T. Kessel ◽  
S. H. Gruber ◽  
K. S. Gledhill ◽  
M. E. Bond ◽  
R. G. Perkins
Keyword(s):  
High Tide ◽  
Central Area ◽  
Aerial Survey ◽  
Successful Implementation ◽  
Shark Species ◽  
Lemon Shark ◽  
Test Species ◽  
Negaprion Brevirostris ◽  
Coastal Marine ◽  
High Site

Aerial survey provides an important tool to assess the abundance of both terrestrial and marine vertebrates. To date, limited work has tested the effectiveness of this technique to estimate the abundance of smaller shark species. In Bimini, Bahamas, the lemon shark (Negaprion brevirostris) shows high site fidelity to a shallow sandy lagoon, providing an ideal test species to determine the effectiveness of localised aerial survey techniques for a Carcharhinid species in shallow subtropical waters. Between September 2007 and September 2008, visual surveys were conducted from light aircraft following defined transects ranging in length between 8.8 and 4.4 km. Count results were corrected for “availability”, “perception”, and “survey intensity” to provide unbiased abundance estimates. The abundance of lemon sharks was greatest in the central area of the lagoon during high tide, with a change in abundance distribution to the east and western regions of the lagoon with low tide. Mean abundance of sharks was estimated at 49 (±8.6) individuals, and monthly abundance was significantly positively correlated with mean water temperature. The successful implementation of the aerial survey technique highlighted the potential of further employment for shark abundance assessments in shallow coastal marine environments.

scholarly journals Histology and surface morphology of the olfactory epithelium in the freshwater teleost Clupisoma garua (Hamilton, 1822)

2019 ◽  
Vol 27 (3) ◽  
pp. 122-129 ◽  
Author(s):  
Saroj Kumar Ghosh
Keyword(s):  
Olfactory Epithelium ◽  
Sensory Epithelium ◽  
Olfactory Organ ◽  
Basal Cells ◽  
Mucous Cells ◽  
Freshwater Teleost ◽  
Receptor Cells ◽  
Olfactory Sensation ◽  
Sensory Cilia ◽  
Receptor Neurons

Abstract The anatomical structure of the olfactory organ and the organization of various cells lining the olfactory mucosa of Clupisoma garua (Siluriformes; Schilbeidae) were investigated with light and scanning electron microscopy. The olfactory organ was composed of numerous lamellae of various sizes, radiating outward from both sides of the narrow midline raphe, forming an elongated rosette. Each lamella consisted of the olfactory epithelium and a central lamellar space, the central core. The epithelium covering the surface of the rosette folds was differentiated into zones of sensory and indifferent epithelia. The sensory part of epithelium was characterized by three types of morphologically distinct receptor neurons: ciliated receptor cells, microvillous receptor cells, and rod receptor cells for receiving olfactory sensation from the aquatic environment. The indifferent epithelium comprising a large surface area of the lamella, was covered with compact non-sensory cilia. The non-sensory epithelium contained stratified epithelial cells with microridges, mucin secreting mucous cells, labyrinth cells, and basal cells, which were arranged in a layer at the base of the epithelium. Various cells on the olfactory epithelium were correlated with the functional significance of the fish concerned.

scholarly journals Histoanatomy and surface ultrastructure of the olfactory organ of the freshwater tank goby, Glossogobius giuris (Hamilton, 1822)

2020 ◽  
Vol 28 (3) ◽  
pp. 141-148
Author(s):  
Saroj Kumar Ghosh
Keyword(s):  
Nerve Fibers ◽  
Olfactory Organ ◽  
Basal Cells ◽  
Supporting Cells ◽  
Blood Capillaries ◽  
Surface Ultrastructure ◽  
Receptor Cells ◽  
Mucosal Lining ◽  
Characteristic Features ◽  
Glossogobius Giuris

AbstractCharacteristic features of histology and fine morphology of the olfactory organ in the tank goby, Glossogobius giuris (Perciformes, Gobiidae, Gobiinae), were investigated with light and scanning electron microscopy. The olfactory cavity contained single lamellae that were exposed to the aquatic environment by small anterior and posterior nostrils. Typical olfactory rosettes were not observed. Histologically, each lamella consisted of two layers of epithelium; wrapping the central core that was composed of connective tissue stroma with nerve fibers and blood capillaries. The mucosal lining of lamella was merged with sensory and non-sensory olfactory cells, identified on the basis of structural characters, surface specializations, and staining features. The principal sensory elements were ciliated receptor cells that were characterized by apical dendritic processes expanded from cell soma and microvillous receptor cells equipped with multiple tiny dendrons on the mucosal surface. The bead-like appearance of several labyrinth cells, mucous cells with secreted mucin, scattered lymphatic cells, stratified epithelial cells bearing microfolds, and condensed ciliated supporting cells were observed in the non-sensory epithelia. Undifferentiated basal cells were embedded in the deeper zone of the epithelium above the basement membrane. The cellular organization of the olfactory lining was interpreted with chemoreception of the fish concerned.

Anatomy of the feeding apparatus of the lemon shark,Negaprion brevirostris

1995 ◽  
Vol 226 (3) ◽  
pp. 309-329 ◽  
Author(s):  
Philip J. Motta ◽  
Cheryl A. D. Wilga
Keyword(s):  
Feeding Apparatus ◽  
Lemon Shark ◽  
Negaprion Brevirostris

Demography of the central california population of the Leopard Shark (Triakis semifasciata)

1992 ◽  
Vol 43 (1) ◽  
pp. 183 ◽  
Author(s):  
GM Cailliet
Keyword(s):  
Population Growth ◽  
Reproductive Rate ◽  
Shark Species ◽  
Sandbar Shark ◽  
Lemon Shark ◽  
Carcharhinus Plumbeus ◽  
Net Reproductive Rate ◽  
Leopard Shark ◽  
Triakis Semifasciata ◽  
Leopard Sharks

Demographic analyses can be quite useful for effectively managing elasmobranch fisheries. However, they require valid estimates of age-specific mortality and natality rates, in addition to information on the distribution, abundance, habits and reproduction of the population, to produce reliable estimates of population growth. Because such detailed ecological information is usually unavailable, complete demographic analyses have been completed for only four shark species: the spiny dogfish, Squalus acanthias; the soupfin shark, Galeorhinus australis; the lemon shark, Negaprion brevirostris; and most recently the sandbar shark, Carcharhinus plumbeus. In California, reliable estimates of age, growth, mortality, age at maturity, and fecundity are available only for the leopard shark, Triakis semifasciata. A demographic analysis of this species yielded a net reproductive rate (Ro) of 4.467, a generation time (G) of 22.35 years, and an estimate of the instantaneous population growth coefficient (r) of 0.067. If the mean fishing pressure over 10 years (F= 0.084) is included in the survivorship function, Ro and r are reduced considerably, especially if leopard sharks first enter the fishery at early ages. A size limit of 120 cm TL (estimated age 13 years), especially for female sharks, is tentatively proposed for the leopard shark fishery.

RECONSTRUCTION OF PARENTAL MICROSATELLITE GENOTYPES REVEALS FEMALE POLYANDRY AND PHILOPATRY IN THE LEMON SHARK, NEGAPRION BREVIROSTRIS

Evolution ◽  
2004 ◽  
Vol 58 (10) ◽  
pp. 2332 ◽  
Author(s):  
Kevin A. Feldheim ◽  
Samuel H. Gruber ◽  
Mary V. Ashley
Keyword(s):  
Lemon Shark ◽  
Negaprion Brevirostris
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