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Elasmobranch

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https://www.readbyqxmd.com/read/28426406/infection-of-the-lesser-spotted-dogfish-with-proleptus-obtusus-dujardin-1845-nematoda-spirurida-reflects-ontogenetic-feeding-behaviour-and-seasonal-differences-in-prey-availability
#1
Carlota Silva, Ana Veríssimo, Pedro Cardoso, Jo Cable, Raquel Xavier
Proleptus obtusus Dujardin, 1845 is the most common parasite infecting the gut of the lesser spotted dogfish (Scyliorhinus canicula, Linnaeus). This nematode is trophically transmitted from an intermediate crustacean host to the definitive elasmobranch host. Sexual and age-related differences in habitat occupancy and feeding behaviour of the lesser spotted dogfish make this parasite-host dyad ideal for testing which aspects of host biology influence parasite transmission. Here, the relationship between P. obtusus burden and host condition, sex and age were investigated in lesser spotted dogfish captured in the Northeast Atlantic...
June 1, 2017: Acta Parasitologica
https://www.readbyqxmd.com/read/28350489/redescription-and-molecular-assessment-of-relationships-among-three-species-of-echeneibothrium-rhinebothriidea-echeneibothriidae-parasitizing-the-yellownose-skate-dipturus-chilensis-in-chile
#2
Veronica M Bueno, Janine N Caira
Much progress has recently been made towards revising the taxonomic assignments of genera originally classified in the polyphyletic "Tetraphyllidea". Many of these genera, including Echeneibothrium van Beneden, 1850, were accommodated in the order Rhinebothriidea. However, beyond this larger taxonomic action, little work has been conducted on this genus over the last 50 yrs. As a consequence, the criteria employed for characterizing species of Echeneibothrium have lagged behind those typically employed in more modern descriptions of elasmobranch-hosted cestode taxa...
March 10, 2017: Journal of Parasitology
https://www.readbyqxmd.com/read/28343270/magnetic-field-discrimination-learning-and-memory-in-the-yellow-stingray-urobatis-jamaicensis
#3
Kyle C Newton, Stephen M Kajiura
Elasmobranch fishes (sharks, skates, and rays) have been hypothesized to use the geomagnetic field as a cue for orienting and navigating across a wide range of spatial scales. Magnetoreception has been demonstrated in many invertebrate and vertebrate taxa, including elasmobranchs, but this sensory modality and the cognitive abilities of cartilaginous fishes are poorly studied. Wild caught yellow stingrays, Urobatis jamaicensis (N = 8), underwent conditioning to associate a magnetic stimulus with a food reward in order to elicit foraging behaviors...
March 25, 2017: Animal Cognition
https://www.readbyqxmd.com/read/28331385/annotated-checklist-of-fish-cestodes-from-south-america
#4
Philippe V Alves, Alain de Chambrier, Tomáš Scholz, José L Luque
An exhaustive literature search supplemented by a critical examination of records made it possible to present an annotated checklist of tapeworms (Cestoda) that, as adults or larvae (metacestodes), parasitize freshwater, brackish water and marine fishes, i.e. cartilaginous and bony fishes, in South America. The current knowledge of their species diversity, host associations and geographical distribution is reviewed. Taxonomic problems are discussed based on a critical evaluation of the literature and information on DNA sequences of individual taxa is provided to facilitate future taxonomic and phylogenetic studies...
2017: ZooKeys
https://www.readbyqxmd.com/read/28324166/redescription-of-chloromyxum-ellipticum-li-nie-1973-myxosporea-chloromyxidae-infecting-the-gall-bladder-of-grass-carp-ctenopharyngodon-idellus-valenciennes-1844-supplemented-by-morphological-and-molecular-characteristics
#5
J Y Zhang, Y L Zhao, M D Batueva, D Luo, Z F Xing, Q Q Zhang, X H Liu
The traditional taxonomy of the genus Chloromyxum Mingazzini, 1890 has been intensively challenged to be paraphyletic by recent ribosomal DNA (rDNA)-based phylogenetic analysis. Undersampling to get rich sequence data to infer more scientific phylogenetic relationships makes scientists conservatively assign all non-marine elasmobranch-infecting species as Chloromyxum sensu lato. Although complex ridge pattern on the spore surface observed by scanning electron microscopy was thought to be critical for the identification of Chloromyxum species, insufficient data also prevent this ultrastructural data to be a valid taxonomic feature for this genus...
March 21, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28286227/ultrastructural-material-and-crystallographic-description-of-endophytic-masses-a-possible-damage-response-in-shark-and-ray-tessellated-calcified-cartilage
#6
Ronald Seidel, Michael Blumer, Paul Zaslansky, David Knötel, Daniel R Huber, James C Weaver, Peter Fratzl, Sidney Omelon, Luca Bertinetti, Mason N Dean
The cartilaginous endoskeletons of elasmobranchs (sharks and rays) are reinforced superficially by minute, mineralized tiles, called tesserae. Unlike the bony skeletons of other vertebrates, elasmobranch skeletons have limited healing capability and their tissues' mechanisms for avoiding damage or managing it when it does occur are largely unknown. Here we describe an aberrant type of mineralized elasmobranch skeletal tissue called endophytic masses (EPMs), which grow into the uncalcified cartilage of the skeleton, but exhibit a strikingly different morphology compared to tesserae and other elasmobranch calcified tissues...
March 9, 2017: Journal of Structural Biology
https://www.readbyqxmd.com/read/28268047/gross-anatomy-and-histology-of-the-olfactory-rosette-of-the-shark-heptranchias-perlo
#7
Sara Ferrando, Lorenzo Gallus, Andrea Amaroli, Chiara Gambardella, Baradi Waryani, Davide Di Blasi, Marino Vacchi
Sharks belonging to the family Hexanchidae have six or seven gill slits, unlike all other elasmobranchs, which have five gill slits. Their olfactory organs have a round shape, which is common for holocephalans, but not for elasmobranchs. Thus, the shape of the olfactory organ represents a further, less striking, peculiarity of this family among elasmobranchs. Despite that, the microscopic anatomy and histology of the olfactory organ have not yet been studied in any species of this family. Here, an anatomical and histological description of the olfactory organ of the sharpnose sevengill shark Heptranchias perlo is given...
February 17, 2017: Zoology: Analysis of Complex Systems, ZACS
https://www.readbyqxmd.com/read/28264196/molecular-basis-of-ancestral-vertebrate-electroreception
#8
Nicholas W Bellono, Duncan B Leitch, David Julius
Elasmobranch fishes, including sharks, rays, and skates, use specialized electrosensory organs called ampullae of Lorenzini to detect extremely small changes in environmental electric fields. Electrosensory cells within these ampullae can discriminate and respond to minute changes in environmental voltage gradients through an unknown mechanism. Here we show that the voltage-gated calcium channel CaV1.3 and the big conductance calcium-activated potassium (BK) channel are preferentially expressed by electrosensory cells in little skate (Leucoraja erinacea) and functionally couple to mediate electrosensory cell membrane voltage oscillations, which are important for the detection of specific, weak electrical signals...
March 16, 2017: Nature
https://www.readbyqxmd.com/read/28262360/an-evaluation-of-mercury-offloading-in-two-central-california-elasmobranchs
#9
Kelley E van Hees, David A Ebert
Elasmobranchs occupy high trophic levels, accumulate high concentrations of mercury in their tissues, and have high energetic levels of maternal investment to offspring, which may cause embryos to be exposed in utero to harmful concentrations of mercury. We investigated the maternal transfer of mercury in two common coastal elasmobranch species, Triakis semifasciata and Platyrhinoidis triseriata, to determine which reproductive parameters may influence mercury offloading, and whether embryos are at risk to mercury toxicity...
March 2, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28238832/the-energetic-physiological-and-behavioral-response-of-lemon-sharks-negaprion-brevirostris-to-simulated-longline-capture
#10
Ian A Bouyoucos, Cory D Suski, John W Mandelman, Edward J Brooks
Commercial fisheries bycatch is a considerable threat to elasmobranch population recovery, and techniques to mitigate sub-lethal consequences can be improved with data on the energetic, physiological, and behavioral response of individuals to capture. This study sought to estimate the effects of simulated longline capture on the behavior, energy use, and physiological stress of juvenile lemon sharks (Negaprion brevirostris). Captive sharks equipped with acceleration biologgers were subjected to 1h of simulated longline capture...
February 24, 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/28207874/growth-and-life-history-variability-of-the-grey-reef-shark-carcharhinus-amblyrhynchos-across-its-range
#11
Darcy Bradley, Eric Conklin, Yannis P Papastamatiou, Douglas J McCauley, Kydd Pollock, Bruce E Kendall, Steven D Gaines, Jennifer E Caselle
For broadly distributed, often overexploited species such as elasmobranchs (sharks and rays), conservation management would benefit from understanding how life history traits change in response to local environmental and ecological factors. However, fishing obfuscates this objective by causing complex and often mixed effects on the life histories of target species. Disentangling the many drivers of life history variability requires knowledge of elasmobranch populations in the absence of fishing, which is rarely available...
2017: PloS One
https://www.readbyqxmd.com/read/28207832/towards-sustainable-fishery-management-for-skates-in-south-america-the-genetic-population-structure-of-zearaja-chilensis-and-dipturus-trachyderma-chondrichthyes-rajiformes-in-the-south-east-pacific-ocean
#12
Carolina Vargas-Caro, Carlos Bustamante, Michael B Bennett, Jennifer R Ovenden
The longnose skates (Zearaja chilensis and Dipturus trachyderma) are the main component of the elasmobranch fisheries in the south-east Pacific Ocean. Both species are considered to be a single stock by the fishery management in Chile however, little is known about the level of demographic connectivity within the fishery. In this study, we used a genetic variation (560 bp of the control region of the mitochondrial genome and ten microsatellite loci) to explore population connectivity at five locations along the Chilean coast...
2017: PloS One
https://www.readbyqxmd.com/read/28179057/mid-atlantic-elasmobranchs-suitable-metal-scouts
#13
Paulo Torres, Regina Tristão da Cunha, Armindo Dos Santos Rodrigues
Heavy metals are a hazard to marine fauna and human health. In this study we assess stable isotopes and metal content in Prionace glauca and Isurus oxyrinchus and analyse these results within and among other species and across regions and geographical areas. Also, we evaluate their suitability, together with Raja clavata and Galeorhinus galeus, as Mid-Atlantic bioindicators. Prionace glauca and I. oxyrinchus shared the same trophic level in a pelagic food web and did not present significant differences between genders or metals, except for As...
February 5, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28177292/intestinal-helminth-fauna-of-the-shortfin-mako-isurus-oxyrinchus-elasmobranchii-lamnidae-in-the-northeast-atlantic-ocean
#14
Jaime Penadés-Suay, Jesús Tomás, Manuel Merchán, Francisco Javier Aznar
Large oceanic sharks represent a suitable model to investigate the influence of a host's oceanic conditions on the structure of its helminth communities. In this study, we describe the intestinal helminth fauna, and investigate determinants of infracommunity structure, in 39 specimens of shortfin mako Isurus oxyrinchus collected in the NE Atlantic. Six cestode species were found in the spiral valve of makos: 3 are typical from lamnid sharks, namely, gravid specimens of Clistobothrium montaukensis, Gymnorhynchus isuri and Ceratobothrium xanthocephalum, and 3 are immature specimens of cestode species common to several elasmobranchs, namely, Dinobothrium septaria, Nybelinia lingualis, and Phyllobothrium cf...
February 8, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28168114/are-sawfishes-still-present-in-mozambique-a-baseline-ecological-study
#15
Ruth H Leeney
Sawfishes (Pristidae) were formerly abundant in the western Indian Ocean, but current data on sawfish presence and distribution are lacking for most of the region. This paper summarises historical records of sawfishes in Mozambican waters and presents the findings of the first assessment of the presence and status of sawfishes in Mozambique. A countrywide baseline assessment was undertaken between May and July 2014, using interviews with artisanal, semi-industrial and industrial fishers, fish traders and fisheries monitoring staff as the primary source of information on sawfish distribution, recent catches, socio-economic value and cultural importance...
2017: PeerJ
https://www.readbyqxmd.com/read/28165147/a-review-on-the-morphology-of-ovarian-follicles-in-elasmobranchs-a-case-study-in-rhizoprionodon-taylori
#16
REVIEW
Daniela S Waltrick, Colin A Simpfendorfer, Cynthia A Awruch
The identification of the elasmobranch secondary ovarian follicles and their function can be challenging and the inconsistent use of terminology derived from other taxa is a matter of ongoing debate. In this study, the available information on the histology of the elasmobranch secondary ovarian follicles derived from atresia (preovulatory follicles) or ovulation (postovulatory follicles) is reviewed highlighting their morphology and steroidogenic capacity. Based on this literature review, the ovarian follicles of the Australian sharpnose shark Rhizoprionodon taylori were classified according to their preovulatory or postovulatory origin...
February 6, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28153417/association-between-chronic-organochlorine-exposure-and-immunotoxicity-in-the-round-stingray-urobatis-halleri
#17
Jillian M Sawyna, Weston R Spivia, Kelly Radecki, Deborah A Fraser, Christopher G Lowe
Chronic organochlorine (OC) exposure has been shown to cause immune impairment in numerous vertebrate species. To determine if elasmobranchs exhibited compromised immunity due to high OC contamination along the coastal mainland of southern California, innate immune function was compared in round stingrays (Urobatis halleri) collected from the mainland and Santa Catalina Island. Proliferation and phagocytosis of peripheral blood, splenic, and epigonal leukocytes were assessed. Percent phagocytosis and mean fluorescence intensity (MFI) were evaluated by quantifying % leukocytes positive for, and relative amounts of ingested fluorescent E...
April 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28144984/embryonic-development-of-the-axial-column-in-the-little-skate-leucoraja-erinacea
#18
Katharine E Criswell, Michael I Coates, J Andrew Gillis
The morphological patterns and molecular mechanisms of vertebral column development are well understood in bony fishes (osteichthyans). However, vertebral column morphology in elasmobranch chondrichthyans (e.g., sharks and skates) differs from that of osteichthyans, and its development has not been extensively studied. Here, we characterize vertebral development in an elasmobranch fish, the little skate, Leucoraja erinacea, using microCT, paraffin histology, and whole-mount skeletal preparations. Vertebral development begins with the condensation of mesenchyme, first around the notochord, and subsequently around the neural tube and caudal artery and vein...
January 31, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28132643/comparative-transcriptomics-of-elasmobranchs-and-teleosts-highlight-important-processes-in-adaptive-immunity-and-regional-endothermy
#19
Nicholas J Marra, Vincent P Richards, Angela Early, Steve M Bogdanowicz, Paulina D Pavinski Bitar, Michael J Stanhope, Mahmood S Shivji
BACKGROUND: Comparative genomic and/or transcriptomic analyses involving elasmobranchs remain limited, with genome level comparisons of the elasmobranch immune system to that of higher vertebrates, non-existent. This paper reports a comparative RNA-seq analysis of heart tissue from seven species, including four elasmobranchs and three teleosts, focusing on immunity, but concomitantly seeking to identify genetic similarities shared by the two lamnid sharks and the single billfish in our study, which could be linked to convergent evolution of regional endothermy...
January 30, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28112880/clasper-gland-morphology-and-development-in-potamotrygon-magdalenae-elasmobranchii-potamotrygonidae
#20
Paola Anaya-López, Martha Patricia Ramírez-Pinilla
Clasper gland morphology and development in Potamotrygon magdalenae and its relation with the acquisition of reproductive maturity is described in males of different developmental stages (embryos, neonates, juveniles, and reproductively active and resting adults). The glands are subcutaneous masses in the proximal base of each clasper. They are partially bilobate organs with a ventral groove that bears a row of papillae. Glands tend to be asymmetric, the left gland has a larger size, a trend that has been observed in other organs of elasmobranchs...
January 23, 2017: Journal of Morphology
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