Consulta: subjectFacets:"Elasmobranch"
Registros recuperados: 19
Data/hora: 05/06/2024 08:18:41

Novel use of pop‑up satellite archival telemetry in sawsharks: insights into the movement of the common sawshark Pristiophorus cirratus (Pristiophoridae)
Provedor de dados: 5
Autores: Burke, Patrick J; Mourier, Johann; Gaston, Troy F; Williamson, Jane E.
Background Understanding movement patterns of a species is vital for optimising conservation and management strategies. This information is often difficult to obtain in the marine realm for species that regularly occur at depth. The common sawshark (Pristiophorus cirratus) is a small, benthic associated elasmobranch species that occurs from shallow to deep-sea environments. No information is known regarding its movement ecology. Despite this, P. cirrata are still regularly landed as nontargeted catch in the south eastern Australian trawl fisheries. Three individuals were tagged with pop-up satellite archival tags (PSATs) off the coast of Tasmania, Australia, to test the viability of satellite tagging on these small elasmobranchs and to provide novel...
Tipo: Text
Palavras-chave: Elasmobranch; Satellite telemetry; Diel vertical migration; Tagging; Pristiophoridae; Australia; Movement.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00632/74399/74101.pdf

AMP-deaminase in elasmobranch fish: A comparative histochemical and enzymatic study
Provedor de dados: 5
Autores: Thebault, Marie-t; Izem, Lahoucine; Leroy, Jean Paul; Gobin, Eric; Charrier, Gregory; Raffin, Jean-paul.
AMP-deaminase activity was measured in white muscle from a wide range of fish, including one cyclostome, 13 chondrosteans, and one teleost to elucidate the pattern of the AMP-deaminase activity in white muscle of fish. Compared to a mammalian (rat) muscle extract, low enzyme activities are found in the cyclostome and two elasmobranchs from two families (Scyliorhinidae, Hexanchidae). In contrast, higher AMP-deaminase activities, similar to mammals, are expressed in Squalidae, all families of skates, Chimaeridae and in the teleostean fish. We then compared AMP-deaminase activities in red and white muscles from two representative elasmobranch fish, the dogfish (Scyliorhinus canicula) and the thornback ray (Raja clavata). The fibre type composition and...
Tipo: Text
Palavras-chave: White fibres; Red fibres; Muscle; Histology; Fish; Evolution; Elasmobranch; AMP deaminase.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-635.pdf

Manta birostris, predator of the deep? Insight into the diet of the giant manta ray through stable isotope analysis
Provedor de dados: 5
Autores: Burgess, Katherine B.; Couturier, Lydie I. E.; Marshall, Andrea D.; Richardson, Anthony J.; Weeks, Scarla J.; Bennett, Michael B.
The characterization of diet for the giant manta ray Manta birostris has been problematic given their large-scale movement patterns and the difficulty in obtaining stomach contents from this species. The large majority of existing information is based on observational data limited to feeding events at the sea surface during daylight. Recently discovered aggregation sites for the giant manta ray off mainland Ecuador are some of the most accessible to date and provide a unique opportunity for researchers to gather much needed information on this elusive species. To assess how important surface zooplankton is to giant manta ray diet, we conducted stable isotope analysis (N-15 and C-13) on M. birostris muscle and surface zooplankton. Trophic position estimates...
Tipo: Text
Palavras-chave: Diet; Eastern tropical Pacific Ocean; Mesopelagic; Trophic ecology; Elasmobranch; Planktivore.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00363/47463/47486.pdf

Seamount egg-laying grounds of the deep-water skate     Bathyraja richardsoni
Provedor de dados: 5
Autores: Henry, L. -a.; Stehmann, M. F. W.; De Clippele, L.; Findlay, H. S.; Golding, N.; Roberts, J. M.
Highly localized concentrations of elasmobranch egg capsules of the deep-water skate Bathyraja richardsoni were discovered during the first remotely operated vehicle (ROV) survey of the Hebrides Terrace Seamount in the Rockall Trough, north-east Atlantic Ocean. Conductivity–temperature–depth profiling indicated that the eggs were bathed in a specific environmental niche of well-oxygenated waters between 4·20 and 4·55° C, and salinity 34·95–35·06, on a coarse to fine-grained sandy seabed on the seamount's eastern flank, whereas a second type of egg capsule (possibly belonging to the skate Dipturus sp.) was recorded exclusively amongst the reef-building stony coral Solenosmilia variabilis. The depths of both egg-laying habitats (1489–1580 m) provide a de...
Tipo: Text
Palavras-chave: Deep sea; Elasmobranch; Environment; Habitat; Reproduction.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00344/45508/45061.pdf

Technical mitigation measures for sharks and rays in fisheries   for tuna and tuna-like species: turning possibility into reality
Provedor de dados: 5
Autores: Poisson, Francois; Abascal Crespo, Francisco; Ellis, Jim R.; Chavance, Pierre; Pascal, Bach; Santos, Miguel. N.; Seret, Bernard; Korta, Maria; Coelho, Rui; Ariz, Javier; Murua, Hilario.
Tuna fisheries have been identified as one of the major threats to populations of other marine vertebrates, including sea turtles, sharks, seabirds and marine mammals. The development of technical mitigation measures (MM) in fisheries is part of the code of conduct for responsible fisheries. An in-depth analysis of the available literature regarding bycatch mitigation in tuna fisheries with special reference to elasmobranchs was undertaken. Studies highlighting promising MMs were reviewed for four tuna fisheries (longline, purse seine, driftnets and gillnet, and rod and line – including recreational fisheries). The advantages and disadvantages of different MMs are discussed and assessed based on current scientific knowledge. Current management measures for...
Tipo: Text
Palavras-chave: Mitigation; Elasmobranch; Bycatch; Pelagic; Mortality; Tuna regional fishery management organizations.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00364/47474/47493.pdf

Variation in occupancy and habitat use of Mobula alfredi at a major aggregation site
Provedor de dados: 5
Autores: Couturier, L. I. E.; Newman, P.; Jaine, F. R. A.; Bennett, M. B.; Venables, W. N.; Cagua, E. F.; Townsend, K. A.; Weeks, S. J.; Richardson, A. J.
Understanding variations in habitat use through time contributes to identification of habitats critical for species survival. Here we used passive acoustic telemetry to examine the residency and site fidelity patterns of the reef manta ray Mobula alfredi at Lady Elliot Island (LEI), a key aggregation site in eastern Australia. Six acoustic receivers were moored around LEI between 2009 and 2012, and 34 acoustic transmitters were deployed on manta rays. All tagged animals returned to this site within their recording period, with some individuals visiting the area for up to 23 consecutive days. Using a set of mixed effect models, we analysed the hourly visitation patterns of manta rays in relation to temporal and environmental variables. Diel phase and sea...
Tipo: Text
Palavras-chave: Acoustic telemetry; Site fidelity; Residency; Generalised linear mixed models; Elasmobranch; Conservation.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00449/56080/57611.pdf

Research Priorities to Support Effective Manta and Devil Ray Conservation
Provedor de dados: 5
Autores: Stewart, Joshua D.; Jaine, Fabrice R. A.; Armstrong, Amelia J.; Armstrong, Asia O.; Bennett, Michael B.; Burgess, Katherine B.; Couturier, Lydie I. E.; Croll, Donald A.; Cronin, Melissa R.; Deakos, Mark H.; Dudgeon, Christine L.; Fernando, Daniel; Froman, Niv; Germanov, Elitza S.; Hall, Martin A.; Hinojosa-alvarez, Silvia; Hosegood, Jane E.; Kashiwagi, Tom; Laglbauer, Betty J. L.; Lezama-ochoa, Nerea; Marshall, Andrea D.; Mcgregor, Frazer; Di Sciara, Giuseppe Notarbartolo; Palacios, Marta D.; Peel, Lauren R.; Richardson, Anthony J.; Rubin, Robert D.; Townsend, Kathy A.; Venables, Stephanie K.; Stevens, Guy M. W.
Manta and devil rays are filter-feeding elasmobranchs that are found circumglobally in tropical and subtropical waters. Although relatively understudied for most of the Twentieth century, public awareness and scientific research on these species has increased dramatically in recent years. Much of this attention has been in response to targeted fisheries, international trade in mobulid products, and a growing concern over the fate of exploited populations. Despite progress in mobulid research, major knowledge gaps still exist, hindering the development of effective management and conservation strategies. We assembled 30 leaders and emerging experts in the fields of mobulid biology, ecology, and conservation to identify pressing knowledge gaps that must be...
Tipo: Text
Palavras-chave: Manta; Mobula; Devil ray; Elasmobranch; Management.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00481/59290/62455.pdf

Hunting tactics of the lemon shark, Negaprion brevirostris, in shallow waters of an oceanic insular area in the western equatorial Atlantic
Provedor de dados: 83
Autores: Garla,Ricardo C.; Gadig,Otto B. F.; Garcia Junior,José; Veras,Leonardo B.; Garrone-Neto,Domingos.
ABSTRACT The hunting tactics of lemon sharks, Negaprion brevirostris, are described from underwater and cliff-top observations in the Fernando de Noronha Archipelago, western equatorial Atlantic, Brazil. Two main tactics were observed in the shallow waters of sandy beaches and reefs environments: (i) “substrate inspection” of crevices and holes over rocky and reef bottoms, and (ii) “sardine blitz”, which refer to striking schools of fishes (mainly sardines) in the surf zone. The first tactic was restricted to juveniles up to 2 m of total length, whereas subadult and adult sharks with total length larger than 2 m displayed the second. As lemon sharks use waters less than 5 m depth to hunt, perform social behaviours and predator avoidance, results highlight...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carcharhinidae; Elasmobranch; Foraging Behaviour; Predation; Predator-prey Interactions.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000100206

Size composition, monthly condition factor and morphometrics for fishery-dependent samples of Rioraja agassizi (Chondrichthyes: Rajidae), off Santos, Southeast Brazil
Provedor de dados: 83
Autores: Oddone,M. Cristina; Amorim,Alberto F. de; Mancini,Patrícia L.; Norbis,Walter.
Specimens of Rioraja agassizi were collected monthly off Santos, Southeast Brazil, between latitudes 23º37'S and 27º40'S, from March, 2005 to March, 2006. A total number of 278 males and 1023 females were captured. Observed depth range was 10-120 m, being the species absent above 120 m. Sex ratio significantly favored females. The entire length range of R. agassizi was observed. Females ranged in length from 16.0 to 59.4 cm and males from 13.0 to 47.2 cm. Mean female length was significantly higher than that of males. For grouped length distributions, asymmetry patterns were observed in both sexes. Length-width functions were sexually dimorphic. Males with lengths &lt; 24.5 cm were relatively wider than females. Length-total weight curves were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Skates; Depth; Total length; Elasmobranch; Sex ratio.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000300021

Stomach contents and notes on the reproduction of the Onefin Skate Gurgesiella dorsalifera (Chondrichthyes: Rajidae) off Southern Brazil
Provedor de dados: 83
Autores: Rincon,Getulio; Vaske Junior,Teodoro; Vooren,Carolus M.
The Brazilian endemic deep-water onefin skate (Gurgesiella dorsalifera) is a rare small species recently described in the 80's. No biological information is available on this species and its extremely restricted geographic distribution has been used to classify it as a vulnerable species under IUCN red list criteria. Twenty four specimens (115 to 207 mm disc width) were captured off southern Brazilian coast at the region of Cape Santa Marta Grande (State of Santa Catarina) by deep-water otter trawl (430-524 m). The analysis of stomach contents revealed an apparent opportunistic predation on juveniles of Urophycis brasiliensis (IRI = 6944), with an average total length of 21 mm, followed by mysidaceans (IRI = 2938), unidentified teleosts (IRI = 1969), the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elasmobranch; Deep-water; Batoidea; Rajiformes.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000400019

DNA barcoding reveals the diversity of sharks in Guyana coastal markets
Provedor de dados: 83
Autores: Kolmann,Matthew A.; Elbassiouny,Ahmed A.; Liverpool,Elford A.; Lovejoy,Nathan R.
ABSTRACT A fundamental challenge for both sustainable fisheries and biodiversity protection in the Neotropics is the accurate determination of species identity. The biodiversity of the coastal sharks of Guyana is poorly understood, but these species are subject to both artisanal fishing as well as harvesting by industrialized offshore fleets. To determine what species of sharks are frequently caught and consumed along the coastline of Guyana, we used DNA barcoding to identify market specimens. We sequenced the mitochondrial co1 gene for 132 samples collected from six markets, and compared our sequences to those available in the Barcode of Life Database (BOLD) and GenBank. Nearly 30% of the total sample diversity was represented by two species of Hammerhead...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: BOLD; Carcharhinidae; Elasmobranch; Guianas; Sphyrnidae.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000400209

Dancing with the devil: courtship behaviour, mating evidences and population structure of the Mobula tarapacana (Myliobatiformes: Mobulidae) in a remote archipelago in the Equatorial Mid-Atlantic Ocean
Provedor de dados: 83
Autores: Mendonça,Sibele Alves de; Macena,Bruno César Luz; Araújo,Camila Brasilino Botêlho de; Bezerra,Natalia Priscila Alves; Hazin,Fabio Hissa Vieira.
Abstract The present work aimed at studying the sicklefin devil ray (Mobula tarapacana) that aggregates seasonally in the Saint Peter and Saint Paul Archipelago (SPSPA). From December 2008 to June 2016, 827 rays were sighted through free diving visual census survey. From the total of the records, it was possible to identify the sex of 361 specimens, in which 215 were females and 146 were males. The disk width ranged from 2.40 m to 3.20 m with mean size of 2.60 m, for both males and females, indicating that the population is composed by sub-adults and adults. Using photo-identification of the pectoral-fins in the ventral side, 11 males and 44 females were identified and compared with each other, but no re-sight was detected. Recent mating scars were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elasmobranch; Photo-identification; Reproduction area; Sexual aggregation.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000300209

Unravelling the foraging behavior of the southern stingray, Hypanus americanus (Myliobatiformes: Dasyatidae) in a Southwestern Atlantic MPA
Provedor de dados: 83
Autores: Freitas,Renato H. A.; Aguiar,Aline A.; Freitas,Ana Karina C. H. A.; Lima,Sergio M. Q.; Valentin,Jean L.
ABSTRACT Previous study suggested that the southern stingray (Hypanus americanus) displays a marked ontogenetic shift in its habitat use in the Fernando de Noronha Archipelago (FNA), an attractive touristic spot in Brazil, that could be associated with changes in its feeding habits and foraging strategies. Here, we conducted underwater visual surveys (~100 h a 3 years’ study) at this site to describe the foraging behavior of the same species in details and to assess diel patterns in activity. We observed that H. americanus is capable of several complex and highly plastic behaviors (we described more than 21 of them) while foraging. The foraging events’ timing appears to be related to the size (as well as sex) of the stingrays, environment and depth. In...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dasyatidae; Elasmobranch; Feeding habits; Fernando de Noronha; Foraging strategies.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000200219

Fishers' ecological knowledge of smalleye hammerhead, Sphyrna tudes , in a tropical estuary
Provedor de dados: 83
Autores: Giglio,Vinicius J.; Bornatowski,Hugo.
ABSTRACT Coastal hammerheads have suffered from overexploitation and environmental degradation. We interviewed 79 artisanal fishers to verify fishery aspects, temporal changes in catches and biological aspects of the smalleye hammerhead, Sphyrna tudes , in a marine protected area on Abrolhos Bank, Brazil. Data were compared between three generations of fishers: young, middle-aged and old. Fishers' age varied between 17 and 88 years. We verified significant reductions in the weight of individuals caught by younger fishers. The main types of fishing gear used to catch S. tudes were gill nets and longlines. Overfishing through gill nets and trawl fisheries were mentioned as the cause of S. tudes population collapse in the region. The shark's diet as reported...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abrolhos Bank; Artisanal fishing; Coastal shark; Elasmobranch; Fisheries management.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000200203

Putative extinction of two sawfish species in Mexico and the United States
Provedor de dados: 83
Autores: del Monte-Luna,Pablo; Castro-Aguirre,José Luis; Brook,Barry W.; de la Cruz-Agüero,José; Cruz-Escalona,Víctor Hugo.
All species of sawfish are listed by the International Union for the Conservation of Nature (IUCN) as endangered or critically endangered. In fact, the smalltooth sawfish Pristis pectinata, and the largetooth sawfish Pristis pristis, have been declared to be regionally and locally extinct from the US Atlantic coast and the Gulf of California, Mexico, respectively, likely due to overfishing. However, here we dispute these claims by illustrating how lack of existence of a given species within a region can be misconstrued as evidence for extinction.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elasmobranch; Batoid; Pristis; Local extinction; Conservation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000300020

The feeding habits of the eyespot skate Atlantoraja cyclophora (Elasmobranchii: Rajiformes) in southeastern Brazil
Provedor de dados: 103
Autores: Viana,Alessandra da Fonseca; Vianna,Marcelo.
The stomach contents of the eyespot skate, Atlantoraja cyclophora (Regan, 1903), were examined with the goal to provide information about the diet of the species. Samples were collected off the southern coast of Rio de Janeiro, Brazil, near Ilha Grande, between January 2006 and August 2007, at a depth of about 60 m. The diet was analyzed by sex, maturity stages and quarterly to verify differences in the importance of food items. The latter were analyzed by: frequency of occurrence, percentage of weight and in the Alimentary Index. The trophic niche width was determined to assess the degree of specialization in the diet. Additionally, the degree of dietary overlap between males and females; juveniles and adults and periods of the year were defined. A total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet; Elasmobranch; Trophic niche; Rajidae; Rio de Janeiro.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000200003

Microscopic aspects of electrosensory system on the partially euryhaline lesser guitarfish
Provedor de dados: 42
Autores: RANGEL,BIANCA S.; WOSNICK,NATASCHA; AMORIM,ALBERTO F.; K. JUNIOR,JOSÉ ROBERTO; RICI,ROSE E.G.
ABSTRACT The electrosensory system on elasmobranchs consists of subcutaneous electroreceptor organs known as ampullae of Lorenzini. The present study investigated the ampullae of Lorenzini morphology of the lesser guitarfish Zapteryx brevirostris, using light microscopy and scanning electron microscopy. The pore number found in the ventral skin surface is much higher than that found in the dorsal portion, characteristic of species that inhabit the euphotic zone. Under light microscopy it was possible to observe that the wall canal consists of a single layer of squamous epithelial cells. The canal features distal expansion, where the ampullae are located with up to six alveoli. The sensory epithelium of ampullae is composed by cubic cells, with oval...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elasmobranch; Ampullae of Lorenzini; Electroreceptors; Light microscopy; Scanning electron microscopy.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100037

Occurrence of Rhinoptericola megacantha (CESTODA, TRYPANORHYNCHA) in new host and new location
Provedor de dados: 45
Autores: Napoleão,S.R.; Antonucci,A.M.; Amorim,A.F.; Takemoto,R.M.
Relata-se a ocorrência de Rhinoptericola megacantha (Cestoda, Trypanorhyncha) parasitando duas raias da espécie Rhinoptera brasiliensis, de um total de sete espécimes analisados. Foram encontrados três espécimes do cestóide, que havia sido descrito ocorrendo apenas no hospedeiro Rhinoptera bonasus capturado em Virginia (EUA), Golfo Venezuelano e Golfo do México. Este é o primeiro relato da ocorrência de R. megacantha no hospedeiro R. brasiliensis e primeira ocorrência no Brasil deste cestóide.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Rhinoptera brasiliensis; Rhinoptericola megacantha; By-catch; Elasmobranch; Brazil.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352015000401175

Feeding habits of the blue shark (Prionace glauca) off the coast of Brazil
Provedor de dados: 49
Autores: Vaske Júnior,Teodoro; Lessa,Rosangela Paula; Gadig,Otto Bismarck Fazzano.
Stomachs from 222 blue sharks collected along the Brazilian coast were analyzed - 116 from the northeastern region and 106 from the southern region. A total of 51 prey taxa were identified. The most important prey items in the southern region were Mysticeti whales, teleosteans, the gempylid Ruvettus pretiosus and the nomeid Arioma bondi. Cephalopods were more diverse, with dominance of vertical migrants Histioteuthis spp., Cranchiidae and the epipelagic octopus Ocythoe tuberculata. In the northeastern region, blue sharks consumed mainly teleosteans, including the alepisaurid Alepisaurus ferox and the gempylid Gempylus serpens. Among cephalopods, Histioteuthis spp. and the epipelagic octopus Tremoctopus violaceus were the dominant items. Predation upon...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elasmobranch; Carcharhinidae; Diet.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032009000300004