Academic literature on the topic 'Elasmobranchii'
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Journal articles on the topic "Elasmobranchii"
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Fahmi, Fahmi, Mohammad Adrim, and Dharmadi Dharmadi. "KONTRIBUSI IKAN PARI (Elasmobranchii) PADA PERIKANAN CANTRANG DI LAUT JAWA." Jurnal Penelitian Perikanan Indonesia 14, no. 3 (February 7, 2017): 295. http://dx.doi.org/10.15578/jppi.14.3.2008.295-301.
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Tinggi tingkat eksploitasi ikan hiu (Shark) dan pari (Elasmobranchii) di Indonesia telah memberikan predikat pada negara ini sebagai negara dengan total produksi ikan-ikan Elasmobranchii yang terbesar di dunia. Akan tetapi, upaya pengelolaan dan konservasi terhadap sumber daya tersebut di Indonesia belum terlaksana disebabkan minim informasi dan data yang mendukung baik biologi maupun perikanan. Penelitian hiu (Shark) dan pari (Elasmobranchii) di Indonesia yang secara intensif telah dilaksanakan sejak tahun 2001, telah berhasil menginventalisir keanekaragaman jenis ikan-ikan Elasmobranchii dari sebagian besar wilayah perairan Indonesia, dan informasi biologi untuk beberapa jenis hiu (Shark) dan pari (Elasmobranchii) yang umum dijumpai telah berhasil pula diperoleh. Hasil penelitian menunjukkan bahwa ikan pari (Elasmobranchii) merupakan kelompok ikan bertulang rawan yang umum dijumpai di perairan Laut Jawa dibandingkan kelompok ikan hiu. Ikan pari bintang (Shark), Himantura gerrardi merupakan salah satu jenis pari (Elasmobranchii) yang paling umum ditemui di seluruh wilayah perairan Indonesia dan memiliki kontribusi yang sangat besar pada total hasil tangkapan yang menggunakan jaring cantrang (danish seine net) di Laut Jawa. Berdasarkan pada hasil tersebut, jenis pari (Elasmobranchii) ini dapat dijadikan sebagai salah satu spesies indikator terhadap keberlangsungan perikanan Elasmobranchii di Indonesia bagian barat, atau Laut Jawa pada khususnya. Indonesia has been regarded as a country which has the highest production of Elasmobranchs in the world. In contrast, there are still no management and conservation actions for this group of fishes yet due to the lack of knowledge and information on Elasmobranchs in Indonesia. Study on sharks and rays have been conducted intensively since 2001 and recorded some preliminary informations about Elasmobranch diversity in this country. One of the results summarized that rays were more common group of Elasmobranchs occurred in the Java Sea. Also, Himantura gerrardi was indicated as one of the commonest rays and it gave the highest contribution of Elasmobranchs caught by the danish seine fishery operating in the Java Sea. This species can also be used as an indicator species for the sustainability of Elasmobranch fisheries in Indonesia or in the Java Sea.
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Bornatowski, Hugo, Raul Rennó Braga, Carolina Kalinowski, and Jean Ricardo Simões Vitule. "“Buying a Pig in a Poke”: The Problem of Elasmobranch Meat Consumption in Southern Brazil." Ethnobiology Letters 6, no. 1 (November 18, 2015): 196–202. http://dx.doi.org/10.14237/ebl.6.1.2015.451.
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In Brazil, the demand for sustainably certified seafood is increasing and retailers have promised to source all seafood from sustainable sources by 2015. In the southern portion of the country, elasmobranch meat is sold as cação, and consumers are often unaware that cação refers to any type of elasmobranch. The present study used questionnaires to investigate the lay public’s knowledge of elasmobranch meat sold in a Brazilian city. Shoppers were surveyed at supermarkets in Curitiba, the largest city in southern Brazil. The study revealed that people do not link commercialized cação meat to sharks and rays (Elasmobranchii), with more than half of respondents who claimed to have already eaten cação did not think they had ever eaten shark or ray. The educational profile of interviewees suggests that this lack of knowledge may be even more common in other segments of Brazilian society. Therefore, we suggest that ecological information about elasmobranchs should be included in Brazilian elementary and high school curricula. Such a measure has the potential to modify behavior, create awareness, and stimulate responsibility throughout society, with the primary goal of reducing shark meat consumption and, ultimately, guaranteeing the long term conservation of marine resources.
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GUINOT, GUILLAUME, SYLVAIN ADNET, KENSHU SHIMADA, KENSHU SHIMADA, CHARLIE J. UNDERWOOD, MIKAEL SIVERSSON, DAVID J. WARD, JÜRGEN KRIWET, and HENRI CAPPETTA. "On the need of providing tooth morphology in descriptions of extant elasmobranch species." Zootaxa 4461, no. 1 (August 20, 2018): 118. http://dx.doi.org/10.11646/zootaxa.4461.1.8.
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Elasmobranchii is a clade of chondrichthyans (cartilaginous fishes) that comprises sharks, skates and rays represented today by approximately 1,200 species. Chondrichthyans have a long evolutionary history dating back to the Late Ordovician (ca. 450 million years ago [Mya]) based on isolated dermal denticles (Janvier 1996). Other remains such as articulated skeletons and teeth are known from the Lower Devonian (ca. 410 Mya: Mader 1986; Miller et al. 2003). The fossil record of modern elasmobranchs (Neoselachii) can be traced back to the Early Permian (ca. 290 Mya) and is represented by isolated teeth (Ivanov 2005), with fossils of crown group sharks and rays appearing in Lower Jurassic (ca. 200 Mya) rocks (e.g., Cappetta 2012). Since their appearance in the geological record, elasmobranchs are mainly represented by isolated teeth, whereas articulated skeletons are very rare and restricted to a small number of fossil localities (e.g., Cappetta 2012). The scarcity of skeletal remains in their fossil record is due to their poorly mineralized cartilaginous skeleton that requires special taphonomical conditions to be preserved. Elasmobranch teeth, in contrast, are composed of highly mineralized tissues (hydroxyapatite) that have a strong preservation potential (Shimada 2006). In addition, elasmobranchs replace their teeth continuously over the course of their life span (polyphyodonty) and therefore shed thousands of teeth in their lifetime (Reif et al. 1978; Schnetz et al. 2016) leading to large numbers of potential fossils. These morphologically highly diverse isolated teeth constitute much of the rich fossil record of elasmobranchs, and largely form the basis of our understanding of elasmobranch diversity and evolution through geological time.
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Biriukov, A. V. "Paleobiogeographical Analysis of Assemblages of Cenomanian Elasmobranchs (Chondrichthyes, Elasmobranchii)." Paleontological Journal 55, no. 5 (September 2021): 559–70. http://dx.doi.org/10.1134/s0031030121050026.
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Falsone, Fabio, Vita Gancitano, Michele Luca Geraci, Giacomo Sardo, Danilo Scannella, Fabrizio Serena, Sergio Vitale, and Fabio Fiorentino. "Assessing the Stock Dynamics of Elasmobranchii off the Southern Coast of Sicily by Using Trawl Survey Data." Fishes 7, no. 3 (June 7, 2022): 136. http://dx.doi.org/10.3390/fishes7030136.
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Elasmobranchii (sharks and rays), which have peculiar and vulnerable life-history traits, are highly threatened by fishing activities. Indeed, between 53% and 71% of Mediterranean elasmobranch species are at risk of extinction. In this context, using the abundance MSY (AMSY) model, the present study provides an assessment of 20 batoids and 16 shark species in the Strait of Sicily, sampled during a bottom trawl survey from 1995 to 2020. Overall, the outputs underline a progressively improving condition for shark and ray assemblages of both shelf and eurybathic zones. As for slope-dwelling species, a horseshoe-shaped dynamic, characterized by a progressive decrease in relative harvesting pressure and an increase in relative biomass followed by an increase in fishing pressure and decrease in biomass, was detected. The dynamics of the Elasmobranchii living in the Strait of Sicily appear to be affected by changes in the fishing patterns of trawlers, showing a shift from shallow water to bathyal fishing grounds and targeting deep-water red shrimp. In this context, it seems wise to limit the impact of deep-water fisheries on Elasmobranchii by reducing fishing efforts and implementing ad hoc management measures aimed at safeguarding these vulnerable species.
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TSIKLIRAS, A. C., and K. I. STERGIOU. "Age at maturity of Mediterranean marine fishes." Mediterranean Marine Science 16, no. 1 (July 23, 2014): 5. http://dx.doi.org/10.12681/mms.659.
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In this review we collected data on the age at maturity (tm) and maximum reported age (tmax) for 235 stocks of Mediterranean marine fishes, belonging to 82 species, 37 families, 12 orders and 2 classes (Actinopterygii and Elasmobranchii). Among Actinopterygii (mean tm ± SD = 2.20 ± 1.43 y, n = 215), tm ranged from 0.3 y, for the common goby Pomatoschistus microps, to 12 y, for dusky grouper Epinephelus marginatus, while among Elasmobranchii (mean tm ± SD = 5.94 ± 2.47 y, n = 20), tm ranged between 2.7 y, for brown ray Raja miraletus, and 12 y for picked dogfish Squalus acanthias. Overall, the tmax ranged between 1 y, for transparent goby Aphia minuta, and 70 y, for wreckfish Polyprion americanus. The mean tmax of Actinopterygii (tmax ± SD = 10.14 ± 9.42 y) was lower than that of Elasmobranchii (tmax ± SD = 14.05 ± 8.47 y). The tm exhibited a strong positive linear relation with tmax for both Actinopterygii (logtm = 0.58 ´ logtmax – 0.25, r2 = 0.51, P < 0.001) and Elasmobranchii (logtm = 0.67 ´ logtmax – 0.006, r2 = 0.51, P = 0.007). The mean tm/tmax did not differ significantly with sex within Actinopterygii (ANOVA: F = 0.27, P = 0.60, n = 90; females: mean ± SD = 0.276 ± 0.143; males: mean ± SD = 0.265 ± 0.138) and Elasmobranchii (ANOVA: F = 1.44, P = 0.25, n = 10; females: mean ± SD = 0.499 ± 0.166; males: mean ± SD = 0.418 ± 0.133). Finally, the dimensionless ratio tm/tmax was significantly lower (ANOVA: F = 31.04, P < 0.001) for Actinopterygii (mean ± SD = 0.270 ± 0.135, n = 180) than for Elasmobranchii, (mean ± SD = 0.458 ± 0.152, n = 20), when stocks with combined sexes were excluded from the analysis.
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Bulguroğlu, S., J. Korun, M. Gökoğlu, and Y. Özvarol. "The marine leech Stibarobdella moorei (Oka, 1910) (Hirudinea, Piscicolidae) parasitic on the thornback ray Raja clavata Linnaeus, 1758 and angelshark Squatina squatina (Linnaeus, 1758) in Antalya Bay, Mediterranean Sea of Turkey." Helminthologia 51, no. 3 (September 1, 2014): 250–52. http://dx.doi.org/10.2478/s11687-014-0237-4.
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Abstract The marine leech, Stibarobdella moorei was collected from dorsal parts of the thornback ray (Raja clavata) and angelshark (Squatina squatina) (Elasmobranchii) captured by commercial trawl vessels as non-target species from depth of 50 meters of Antalya Bay which is located in the eastern Mediterranean coast of Turkey on April and July, 2013. The leeches caused two typical lesions on epidermal tissues of both hosts: the major lesion by oral sucker and a minor one by caudal sucker. The leeches were identified as Stibarobdella moorei which has not been reported from elasmobranches in the Turkey’s Mediterranean shores. This study represents new host and geographical records.
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Marra, Nicholas J., Michael J. Stanhope, Nathaniel K. Jue, Minghui Wang, Qi Sun, Paulina Pavinski Bitar, Vincent P. Richards, et al. "White shark genome reveals ancient elasmobranch adaptations associated with wound healing and the maintenance of genome stability." Proceedings of the National Academy of Sciences 116, no. 10 (February 19, 2019): 4446–55. http://dx.doi.org/10.1073/pnas.1819778116.
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The white shark (Carcharodon carcharias; Chondrichthyes, Elasmobranchii) is one of the most publicly recognized marine animals. Here we report the genome sequence of the white shark and comparative evolutionary genomic analyses to the chondrichthyans, whale shark (Elasmobranchii) and elephant shark (Holocephali), as well as various vertebrates. The 4.63-Gbp white shark genome contains 24,520 predicted genes, and has a repeat content of 58.5%. We provide evidence for a history of positive selection and gene-content enrichments regarding important genome stability-related genes and functional categories, particularly so for the two elasmobranchs. We hypothesize that the molecular adaptive emphasis on genome stability in white and whale sharks may reflect the combined selective pressure of large genome sizes, high repeat content, high long-interspersed element retrotransposon representation, large body size, and long lifespans, represented across these two species. Molecular adaptation for wound healing was also evident, with positive selection in key genes involved in the wound-healing process, as well as Gene Ontology enrichments in fundamental wound-healing pathways. Sharks, particularly apex predators such as the white shark, are believed to have an acute sense of smell. However, we found very few olfactory receptor genes, very few trace amine-associated receptors, and extremely low numbers of G protein-coupled receptors. We did however, identify 13 copies of vomeronasal type 2 (V2R) genes in white shark and 10 in whale shark; this, combined with the over 30 V2Rs reported previously for elephant shark, suggests this gene family may underlie the keen odorant reception of chondrichthyans.
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Da Silva, João Paulo C. B., Diego F. B. Vaz, and Marcelo R. de Carvalho. "Phylogenetic inferences on the systematics of squaliform sharks based on elasmobranch scapular morphology (Chondrichthyes: Elasmobranchii)." Zoological Journal of the Linnean Society 182, no. 3 (August 23, 2017): 614–30. http://dx.doi.org/10.1093/zoolinnean/zlx051.
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Abstract The scapulae of elasmobranchs project dorsolaterally from their fusion with the coracoid bar of the pectoral girdle, serving as anchoring points for the cucullaris, trunk and appendicular muscles and as articular points for the pectoral-fin skeleton. The scapulae of many elasmobranch taxa are described, with an emphasis on variations in the posterior margin, in an effort to reveal characters of phylogenetic relevance. In particular, phylogenetic information from the scapula was found for some squaliform sharks. Representatives of Dalatiidae, Somniosidae, Oxynotidae and Etmopteridae have a process on the ventral third of the posterior margin of the scapula, providing an additional surface for anchoring the origin of the appendicular muscle: the levator pectoralis. The ventral scapular process in Dalatiidae, Somniosus and Etmopterus is remarkably developed. This contrasts with an absent or weakly developed ventral triangular process observed in remaining squaliforms and other shark taxa. A single dorsal projection of the scapulae is restricted for Carcharhinidae and Centrophorus and provides an additional anchoring point for the m. epaxialis. Most representatives of Somniosidae (except Somniosus), Trigonognathus and some genera of Scyliorhinidae, Proscylliidae and Triakidae have both dorsal and ventral triangular processes. These structures are described and discussed in the context of previous morphological and molecular phylogenies of elasmobranchs.
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Kelly, Michael L., Errol R. P. Murray, Caroline C. Kerr, Craig A. Radford, Shaun P. Collin, John A. Lesku, and Jan M. Hemmi. "Diverse Activity Rhythms in Sharks (Elasmobranchii)." Journal of Biological Rhythms 35, no. 5 (June 11, 2020): 476–88. http://dx.doi.org/10.1177/0748730420932066.
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Sharks are an interesting group of vertebrates, as many species swim continuously to “ram” oxygen-rich seawater over their gills (ram ventilators), whereas other species “pump” seawater over their gills by manipulating buccal cavity volume while remaining motionless (buccal pumpers). This difference in respiratory physiology raises the question: What are the implications of these differences in lifestyle for circadian rhythms? We investigated the diel activity patterns of 5 species of sharks, including 3 ram ventilating species: the school shark ( Galeorhinus galeus), the spotted estuary smooth-hound ( Mustelus lenticulatus), and the spiny dogfish ( Squalus acanthias); and 2 buccal pumping species: the Port Jackson ( Heterodontus portusjacksoni) and draughtsboard ( Cephaloscyllium isabellum) sharks. We measured the amount, duration, and distance traveled while swimming over multiple days under a 12:12 light:dark light regime for all species and used modified light regimes for species with a clear diel rhythm in activity. We identified a surprising diversity of activity rhythms. The school shark and smooth-hound swam continuously; however, whereas the school shark swam at the same speed and covered the same distance during the day and night, the smooth-hound swam slower at night and traversed a shorter distance. A similar pattern was observed in the spiny dogfish, although this shark swam less overall. Both the Port Jackson and draughtsboard sharks showed a marked nocturnal preference for swimming. This pattern was muted and disrupted during constant light and constant dark regimes, although circadian organization of this pattern was maintained under certain conditions. The consequences of these patterns for other biological processes, such as sleep, remain unclear. Nonetheless, these 5 species demonstrate remarkable diversity within the activity rhythms of sharks.
Dissertations / Theses on the topic "Elasmobranchii"
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Moreira, Renan Andrade. "Morfologia comparada do órgãos copuladores de Batoidea (Chondrichthyes: Elasmobranchii)." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/41/41133/tde-22032018-132941/.
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A superordem Batoidea é fortemente corroborada como monofilética, com cerca de 650 espécies viventes, sendo a superordem mais diversa dentre os Chondrichthyes. O órgão copulador duplo, conhecido como mixopterígio, é uma das sinapomorfias de Chondrichthyes. O mixopterígio de Batoidea, com exceção de Rajidae, não foi amplamente analisado do ponto de vista comparativo, sendo o conhecimento restrito a descrições isoladas de alguns táxons. O vasto conhecimento do mixopterígio de rajídeos evidencia a grande importância da estrutura em estudos de taxonomia e filogenia, com muitos táxons definidos principalmente baseados na anatomia e morfologia dos componentes que formam o órgão copulador. Os demais grupos carecem de estudos comparativos como feitos para Rajidae. Devido à importância sistemática do mixopterígio em Rajidae, o presente projeto tem objetivo descrever as estruturas internas e externas que compõem o órgão copulador dos membros das famílias de Batoidea, identificar possíveis padrões anatômicos que caracterizam grupos taxonômicos e testar o monofiletismo da superordem Batoidea e de seus principais grupos. A terminologia utilizada para os componentes do órgão copulador é praticamente toda baseada na família Rajidae, sendo necessária uma revisão abordando os demais grupos de raias e seus táxons proximamente relacionadosBatoidea is a monophyletic group and is the most diverse superorder within Chondrichthyes with about 640 valid species. Endoskeletal copulatory organs in males (claspers) are a synapomorphy of Chondrichthyes. The classification as well as interrelationships within elasmobranchs has been influenced by characters found in the copulatory organs. In Rajiformes (skates), for example, the claspers are very important in phylogenic and taxonomic studies, with most genera and species defined based on the anatomy of clasper elements, especially those of the terminal group (dorsal and ventral terminal cartilages). However in other batoids the anatomy and morphology of the claspers are still precariously known, highlighting the necessity of a thorough morphological analysis of the copulatory organs of Batoidea. The present PhD project, therefore, is a thorough, detailed morphological and systematic analysis of the variation observed in claspers among all batoid groups. The main objective of the present project is to describe and compare the external and internal (muscle and skeleton) components of the clasper, clarifying relationships of homology of its components among batoids, and discovering systematic patterns that are plylogenetically informative that may aid in resolving problematic relationships within batoids (such as which batoid group is most basal, elucidate the doubtful monophyletic status of guitarfishes, and the phylogenetic position of problematic taxa, such as Zanobatus, Platyrhinidae and electric rays)
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Mello, Waldiney Cavalcante de. "Relações filogenéticas dos tubarões-martelo (Elasmobranchii: Sphyrnidae) com ênfase em morfologia." Universidade do Estado do Rio de Janeiro, 2011. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=6041.
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Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorA cabeça lateralmente expandida é a principal sinapomorfia da família Sphyrnidae, a qual compreende todos os tubarões-martelo. Apesar de haver trabalhos abordando esta família, sua anatomia interna tem sido negligenciada como fonte de caracteres para serem utilizados na taxonomia e filogenia dos Sphyrnidae, em especial acerca de seu cefalofólio. Além disso, outros caracteres permanecem pouco estudados na família, tais como os referentes à anatomia dentária, dentículos dérmicos e sistema de poros sensoriais do cefalofólio. As relações filogenéticas entre os Sphyrnidae, e desta família entre os demais Carcharhiniformes, ainda é controversa como sua taxonomia. As poucas hipóteses filogenéticas conhecidas, baseadas em morfologia, não foram testadas sob critérios sistemáticos. Já as poucas hipóteses moleculares existentes foram testadas mas são ainda mais controversas. O presente estudo apresenta uma revisão anatômica e taxonômica dos Sphyrnidae, construindo uma matriz de caracteres mais robusta para testar as relações filogenéticas entre os Sphyrnidae, contando com 3 gêneros relacionados no grupo externo: Carcharhinus, Rhizoprionodon e Negaprion. Os resultados posicionam S. tiburo na base da família, e E. blochii e S. tudes compondo um dos clados mais derivados. Espécies de maior porte e cefalofólio mais expandido compõem um clado formado por S. mokarran + (S. lewini + S. zygaena), ao passo que as de menor porte e com cefalofolio mais arredondado formam um grupo polifilético. Rhizoprionodon acutus aparece como monofilético à família Sphyrnidae quando incluído fora do grupo externo. As árvores de consenso (Strictus, Semi-strictus, Majority-rule e Adams) apresentam os mesmos resultados. Os caracteres cranianos, sensoriais e de dentículo dérmico são os que mais suportaram os diversos clados. Após a revisão taxonômica da família, a filogenia com base em morfologia apresentou-se mais consistente e clara, embora controversa aos dados moleculares.
The laterally expanded head is the main synapomorphy of the family Sphyrnidae, which comprises all the hammerhead sharks. In spite of the existence of some works on this family, the internal anatomy have been neglected as a soured of characters to be used in the taxonomy and phylogeny of this family, especially about the cephalofoil. Additionally, other characters remains poorly studied in Sphyrnidae, such as the complete teeth anatomy, dermal denticles and sensorial system of pores in the cephalofoil. It is advocated here that the study of such sources of features would give new characters to construct a more robust matrix to be used in the phylogeny of this family. The interrelationships within the Sphyrnidae, as well as of this family among the other Carcharhiniformes is still controversial as their taxonomy. The few phylogenetical hypothesis based on morphology were never tested before, besides accepted by many authors. In the other hand, the few hypothesis based on molecular data were tested but are even more controversial. The present study presents a anatomic and taxonomic review of the family Sphyrnidae, constructing a more robust matrix that were tested to verify the interrelationships within the family Sphyrnidae, using, for the first time, 3 related genera: Carcharhinus, Rhizoprionodon and Negaprion. The results show that S. tiburo is the most basal living sphyrnid, and E. blochii and S. tudes comprise one of the most derived clade. The large species with the most expanded cephalofoil comprise a monophyletic clade S. mokarran + (S. lewini + S. zygaena), while the small sized species with a more rounded cephalofoil are a polifiletic group. Rhizoprionodon acutus appeared as monophyletic to Sphyrnidae when included ouside the outgroup. The consensus trees (Strictus, Semi-strictus, Majority-rule and Adams showed the same relashionships. The cranial characters supported many clades, followed by sensorial and dermal denticle features. After the taxonomic review of the family, the phylogeny presented to be consistent, besides still controversial to molecular data.
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Gomes, Ulisses Leite. "Revisão taxonômica da família Rajidae no Brasil (Chondrichthyes, Elasmobranchii, Rajiformes)." Universidade Federal do Rio de Janeiro, 2002. http://hdl.handle.net/11422/3463.
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Foi realizada uma revisão taxonômica dos peixes da família Rajidae ocorrentes em águas brasileiras. Os arranjos taxonômicos apresentados e recentes capturas de material de grande profundidade incluído neste estudo, aumentou o número de representantes desta família para águas brasileiras em 37%. Novos táxons, assim como novos registros de ocorrência são descritos. Uma revisão dos caracteres externos, úteis para a identificação das espécies, foi realizada visando facilitar a identificação de exemplares no campo e laboratório. A família Rajidae no Brasil é a mais diversificada dos Batomorphii, constituída por duas subfamílias, cinco tribos, onze gêneros e vinte e seis espécies. Este total representa 42% das espécies de raias marinhas do Brasil. Os gêneros Breviraja, Cruriraja e Malacoraja são registrados pela primeira vez em águas brasileiras, assim como o são as espécies Breviraja spinosa, Cruriraja rugosa, Dipturus garricki, Dipturus teevani, Dipturus garricki e Rajella purpuriventralis. Novas espécies reconhecidas no presente trabalho são, Dipturus sp2, Dipturus sp3 e Malacoraja sp. Tiveram seus registros de ocorrências expandidos em águas brasileiras : Rajella sadowskii, Dipturus leptocauda, Sympterygia acuta e Gurgesiella dorsalifera. Conforme observado na literatura, os Rajidae apresentam uma dependência direta com o substrato. A dieta é composta de animais bentônicos, especialmente crustáceos, além de poliquetas, nematódeos, cefalópodes e peixes teleósteos. Dados de distribuiçao das espécies revelou que os Rajidae do talude apresentam uma maior amplitude de distribuição. A foz dos grandes cursos de água por causarem alterações em fatores abióticos, como a salinidade e a temperatura, influem diretamente na distribuição dos Rajidae. A plataforma continental ampla e arenosa do sul do Brasil até o norte do Rio de Janeiro, permite uma ampla distribuição latitudinal dos Rajideos costeiros. A reduzida representação do grupo em coleções científicas, porém, limitam o conhecimento sobre a biologia das espécies, dificultando também o esclarecimento da taxonomia de certos taxons.
A taxonomic review of the rajid fishes occurring in Brazilian waters were held. The taxonomic arrangement as well as recent captures of deep water specimens included in this study, increased in 37% the number of Brazilian Rajidae. New taxons and also new records of occurrence were described. A revision of external characters, useful for specific identification, was held to facilitate the identification in both laboratory and field work. The family Rajidae in Brazil showed to be the most diversified of batoid fishes with two subfamilies, five tribes, eleven genera and twenty six species representing 42% of the Brazilian marine rays. The genera Breviraja, Cruriraja and Malacoraja are recorded for the first time in Brazilian water as does the species Breviraja spinosa, Cruriraja rugosa, Dipturus garricki, Dipturus teevani, Dipturus garricki and Rajella purpuriventralis. New species recognized in the present study are, Dipturus sp2, Dipturus sp3 e Malacoraja sp. The species who had their expanded occurrence records in Brazilian waters are Rajella sadowskii, Dipturus leptocauda, Sympterygia acuta and Gurgesiella dorsalifera. As seen in literature, the rajids have a close relationship with the sea botton. The main diet are crustaceans, polichetes, nematoids, cephalopods and teleost f ishes. Distribution data has revealed that the rajids from the slope presents a great distribution range. The mouth of the main rivers, acting directly abiotic factors, presented important influence in rajid distribution. The continental slope from Rio de Janeiro to the south of Brazil are mostly sandy, allowing a wide latitudinal range of the coastal rajids.With few specimens kept in scientific collections limit the taxonomic and biological knowledgement of certain taxons.
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Yokota, Leandro [UNESP]. "Taxonomia, biologia reprodutiva e dieta da Raia Borboleta, Gymnura micrura (Myliobatiformes: Elasmobranchii)." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/106573.
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yokota_l_dr_rcla.pdf: 2270400 bytes, checksum: ee009c38f75c673fe46f760c6c991d31 (MD5)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
O objetivo do presente estudo foi estudar a estrutura populacional, biologia reprodutiva e dieta dos exemplares identificados como Gymnura micrura capturados na região de Caiçara do Norte (RN), além de definir sua correta identidade taxonômica através de uma comparação com exemplares provenientes de outras localidades dentro de sua suposta área de ocorrência no Atlântico Oeste. A revisão da família Gymnuridae no Brasil é realizada. Os exemplares foram obtidos através do acompanhamento da pesca artesanal na região de Caiçara do Norte (RN) durante o período de agosto de 2007 a julho de 2008. Visitas a coleções foram realizadas para análise do material comparativo. A espécie em questão trata-se realmente de Gymnura micrura (BLOCH & SCHNEIDER, 1801), ocorrendo da costa norte dos Estados Unidos ao sul do Brasil (Paraná). No Brasil ocorrem dois representantes da família Gymnuridae: Gymnura micrura e Gymnura altavela. A terceira espécie que ocorreria no Brasil, G. hirundo, é proposta como um sinônimo júnior de G. altavela. São apresentadas evidências contra a validade do gênero Aetoplatea, sendo que a família seria representada apenas por um gênero (Gymnura). Na população estudada indivíduos maiores tendem a ocupar águas mais profundas e entre os jovens parece existir uma leve tendência à segregação sexual por profundidade, com os machos ocupando águas ligeiramente mais profundas. O tamanho de primeira maturação dos machos e fêmeas foi estimado em 275 e 410 mm de largura do disco (LD) respectivamente, enquanto o tamanho de nascimento foi estimado entre 135 e 175 mm LD. A fecundidade uterina foi estimada em 3,8±1,3 embriões, e foi significativamente correlacionada com a LD das fêmeas. É proposta uma reprodução contínua ao longo do ano sem qualquer sincronismo em nível populacional. A dieta foi constituída basicamente de teleósteos...
The purpose of the present thesis was to study the population structure, reproductive biology and diet of the specimens identified as Gymnura micrura from Caiçara do Norte-RN (Northeast Brazil), and to define their correct taxonomic identity by comparing them with specimens from other regions within their supposed area of occurrence at the Western Atlantic. A review of the family Gymnuridae in Brazil was carried out. The specimens were obtained by monitoring the artisanal fisheries in the region of Caiçara do Norte (RN) during the period from August 2007 to July 2008. Visits to scientific collections were made for analysis of comparative material. The species studied was confirmed to be Gymnura micrura (BLOCH & SCHNEIDER, 1801), which occurs from the northern coast of the United States to southern Brazil (Paraná State). In Brazil there are two species of the family Gymnuridae: Gymnura micrura and Gymnura altavela. The third species known as occurring in Brazil, G. hirundo, is proposed as a junior-synonym of G. altavela. Evidence against the validity of genus Aetoplatea is presented, so the family Gymnuridae should be represented by only one genus (Gymnura). In the population studied larger individuals tend to occupy deeper waters and among the young individuals there seems to exist a slight tendency for sexual segregation by depth, with males occupying slightly deeper waters. Mean sizes at maturity were 275 mm disc width (DW) in males and 410 mm DW in females. Size at birth was 135 – 175 mm DW. The uterine fecundity was assessed in 3.8±1.3 embryos, and was significantly correlated with female DW. It is proposed that in the study area breeding occurs throughout the year with no population synchronism. The diet consisted mainly of teleosts (IA = 99.5 %), with the predominance of one species (Pomadasys corvinaeformis). The graphical ecological analysis characterizes... (Complete abstract click electronic access below)
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Casas, André Luis da Silva. "Inervação da musculatura mandibular de Carcharias taurus (Rafinesque, 1810) (Odontaspididae, Lamniformes, Elasmobranchii)." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/10/10132/tde-06082007-122316/.
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Quinze cabeças de tubarões Carcharias taurus (Rafinesque, 1810), pertencentes à Ordem Lamniformes e Família Odontaspididae, foram utilizadas para a realização desse estudo. O material destinado à análise foi obtido junto ao Terminal de Pesca de Santos, localizado em Santos, São Paulo, e descartado pelos pescadores por não apresentar valor comercial. A dissecação das cabeças visou caracterizar os músculos mandibulares, bem como descrever sua inervação realizada pelo ramo mandibular do nervo trigêmeo. Os músculos mandibulares de C. taurus são representados por: músculo pré-orbital, músculo levantador do palatoquadrado, músculo quadrado-mandibular e músculo intermandibular. O nervo trigêmeo de C. taurus origina-se em uma porção lateral da medula oblonga e ramifica-se na órbita para originar o ramo mandibular responsável pela inervação dos músculos derivados do arco mandibular. Os ramos proximais do ramo mandibular do nervo trigêmeo inervam o músculo levantador do palatoquadrado, o músculo pré-orbital e o músculo quadrado-mandibular recebem fibras dos ramos intermediários do ramo mandibular do nervo trigêmeo e a ramificação distal do mesmo é visualizada no músculo intermandibular.During this study were used fifteen of Carcharias taurus (Rafinesque, 1810) (Odontaspididae, Lamniformes, Elasmobranchii) shark heads. The analised material was obteined in Terminal de Pesca de Santos, located in Santos, São Paulo. The material was descarded by the fishers because it hasn´t none comercial value. The heads dissection is foccated in the caracterization of the mandibular muscles and to discrebed the mandibular branch of the trigeminal nerve innervation as well. The C. taurus mandibular muscles are represented by: muscle pré-orbital, muscle levantador do palatoquadrado, muscle quadrado-mandibular and muscle intermandibular. The origin of the trimeginal nerve of C. taurus is located in a lateral portion of the medula oblonga. In the orbita it ramificates to originate de mandibular branch that inervates the muscles which is derived from the mandibular arch. The mandibular branch of the trigeminal nerve\'s proximal branches inervetes the muscle levantador do palatoquadrado, the muscles pré-orbitall and quadrado-mandibular receives fibers from the intermediate branches of the mandibular branch of the trigeminal nerve and the distal ramification of the mandibular branch are visualised in the muscle intermandibularis.
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Yokota, Leandro. "Taxonomia, biologia reprodutiva e dieta da Raia Borboleta, Gymnura micrura (Myliobatiformes: Elasmobranchii) /." Rio Claro : [s.n.], 2010. http://hdl.handle.net/11449/106573.
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Resumo: O objetivo do presente estudo foi estudar a estrutura populacional, biologia reprodutiva e dieta dos exemplares identificados como Gymnura micrura capturados na região de Caiçara do Norte (RN), além de definir sua correta identidade taxonômica através de uma comparação com exemplares provenientes de outras localidades dentro de sua suposta área de ocorrência no Atlântico Oeste. A revisão da família Gymnuridae no Brasil é realizada. Os exemplares foram obtidos através do acompanhamento da pesca artesanal na região de Caiçara do Norte (RN) durante o período de agosto de 2007 a julho de 2008. Visitas a coleções foram realizadas para análise do material comparativo. A espécie em questão trata-se realmente de Gymnura micrura (BLOCH & SCHNEIDER, 1801), ocorrendo da costa norte dos Estados Unidos ao sul do Brasil (Paraná). No Brasil ocorrem dois representantes da família Gymnuridae: Gymnura micrura e Gymnura altavela. A terceira espécie que ocorreria no Brasil, G. hirundo, é proposta como um sinônimo júnior de G. altavela. São apresentadas evidências contra a validade do gênero Aetoplatea, sendo que a família seria representada apenas por um gênero (Gymnura). Na população estudada indivíduos maiores tendem a ocupar águas mais profundas e entre os jovens parece existir uma leve tendência à segregação sexual por profundidade, com os machos ocupando águas ligeiramente mais profundas. O tamanho de primeira maturação dos machos e fêmeas foi estimado em 275 e 410 mm de largura do disco (LD) respectivamente, enquanto o tamanho de nascimento foi estimado entre 135 e 175 mm LD. A fecundidade uterina foi estimada em 3,8±1,3 embriões, e foi significativamente correlacionada com a LD das fêmeas. É proposta uma reprodução contínua ao longo do ano sem qualquer sincronismo em nível populacional. A dieta foi constituída basicamente de teleósteos... (Resumo completo, clicar acesso eletrônico abaixo)Abstract: The purpose of the present thesis was to study the population structure, reproductive biology and diet of the specimens identified as Gymnura micrura from Caiçara do Norte-RN (Northeast Brazil), and to define their correct taxonomic identity by comparing them with specimens from other regions within their supposed area of occurrence at the Western Atlantic. A review of the family Gymnuridae in Brazil was carried out. The specimens were obtained by monitoring the artisanal fisheries in the region of Caiçara do Norte (RN) during the period from August 2007 to July 2008. Visits to scientific collections were made for analysis of comparative material. The species studied was confirmed to be Gymnura micrura (BLOCH & SCHNEIDER, 1801), which occurs from the northern coast of the United States to southern Brazil (Paraná State). In Brazil there are two species of the family Gymnuridae: Gymnura micrura and Gymnura altavela. The third species known as occurring in Brazil, G. hirundo, is proposed as a junior-synonym of G. altavela. Evidence against the validity of genus Aetoplatea is presented, so the family Gymnuridae should be represented by only one genus (Gymnura). In the population studied larger individuals tend to occupy deeper waters and among the young individuals there seems to exist a slight tendency for sexual segregation by depth, with males occupying slightly deeper waters. Mean sizes at maturity were 275 mm disc width (DW) in males and 410 mm DW in females. Size at birth was 135 - 175 mm DW. The uterine fecundity was assessed in 3.8±1.3 embryos, and was significantly correlated with female DW. It is proposed that in the study area breeding occurs throughout the year with no population synchronism. The diet consisted mainly of teleosts (IA = 99.5 %), with the predominance of one species (Pomadasys corvinaeformis). The graphical ecological analysis characterizes... (Complete abstract click electronic access below)
Orientador: Roberto Goitein
Coorientador: Rosângela Paula Lessa
Coorientador: Ricardo de Souza Rosa
Banca: Otto Bismarck Fazzano Gadig
Banca: Patricia Charvet
Banca: Getulio Rinson Filho
Banca: June Ferraz Dias
Doutor
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BARRETO, Rodrigo Risi Pereira. "História de vida e vulnerabilidade de tubarões oceânicos (Elasmobranchii) do atlântico sul." Universidade Federal Rural de Pernambuco, 2015. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/7085.
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Rodrigo Risi Pereira Barreto.pdf: 4263357 bytes, checksum: 758f4258cdf8151b0f0baf5581f7b980 (MD5)Made available in DSpace on 2017-10-23T13:23:40Z (GMT). No. of bitstreams: 1 Rodrigo Risi Pereira Barreto.pdf: 4263357 bytes, checksum: 758f4258cdf8151b0f0baf5581f7b980 (MD5) Previous issue date: 2015-08-28
A great diversity of sharks has been explored by modern fisheries, regularly caught as by-catch and after the decade of 1990’s as target species, mainly due to the high value of their fins in the international market. This species group is characterized by slow growth, late maturity, high longevity, low rates of fertility and productivity that implies in low potential of replacement for most species, resulting in serious implications for the sustainability of populations and also for fishing. Coastal nations of the South Atlantic (Brazil, Uruguay, South Africa and Namibia) have historically (since the 50s) given its ports to traditional longline fleets (mainly from Asia and the European Union) in order to exchange technology to develop their own fleets through a policy known as leasing. Declines of commercial species such as tuna and swordfish elsewhere, moreover divisions of fishing quotas established by the ICCAT, main RFMO in Atlantic, were responsible for the introduction of at least 20 different pelagic longline fleets. Pelagic longline fishing are demonstrably associated with declines in abundance of many species of oceanic sharks in various locations around the world. However information on the South Atlantic is incipient, with few studies focusing on more abundant species such as the blue shark. This thesis gathers information about catches and life history collected from the main monitoring fishing agencies from Brazil, in order to identify population trends and conservation status for main species caught in the South Atlantic. In the first chapter, we address the age and growth of the shortfin mako shark, because growth of this specie had not yet been studied in our study area. In Chapter 2, we discuss the history of fishing as well the different phases of exploitation focused in western and central South Atlantic, resulting in the identification of trends in exploitation and thus, abundances of key species. The third chapter addresses the vulnerability of this group of species through the use of different demographic methods. Overall our results show that most species analyzed are depleted and seriously threatened by pelagic longline fishing, which still lacks adequate monitoring and control in the South Atlantic.
Uma grande diversidade de tubarões vem sendo explorada pelas pescarias modernas, capturados regularmente como by-catch (ou captura incidental) e apos a década de 90 como espécies alvo, principalmente devido ao alto valor de suas nadadeiras no mercado internacional. Este grupo de espécies é caracterizado por crescimento lento, maturação tardia, alta longevidade, baixas taxas de fecundidade e produtividade, conjunto de características que implicam em baixo potencial de reposição para a maioria das espécies, resultando em sérias implicações para a sustentabilidade das populações e também da pesca. Nações costeiras do Atlantico Sul (Brasil, Uruguai, Africa do Sul e Namibia) têm desde a década de 50 cedido seus portos a frotas espinheleiras tradicionais (principalmente da Asia e Uniao Europeia) objetivando intercâmbio de tecnologia para desenvolver suas próprias frotas através de uma politica conhecida como arrendamento. Declinios de espécies comerciais como por exemplo os atuns e os espadartes em outras localidades, assim como as divisões de cotas de pesca estabelecidas pela principal RFMO do Atlantico, a ICCAT, foram responsáveis pela introducao pelo menos 20 diferentes frotas que utilizam espinheis pelágicos. Espinheis pelágicos estão comprovadamente associados a declínios em abundancia de inúmeras espécies de tubarões oceânicos, em diversas localidades do mundo. Entretanto informações sobre o Atlantico Sul sao incipientes, com poucos estudos concentrados em espécies mais abundantes como, por exemplo, o tubarão azul. A presente tese reúne informações sobre captura e historia de vida coletadas junto aos principais órgãos de monitoramento sediados no Brasil, com objetivo de identificar tendências populacionais para as principais espécies capturadas no Atlantico Sul. No primeiro capitulo, abordamos a idade e crescimento do tubarão mako, em virtude de ser a única espécie (em meio as principais) cujo crescimento ainda não tinha sido estudado na área do presente estudo. No capítulo 2, abordamos o histórico da pesca bem como as diferentes fases de exploração em nossa área de estudo, resultando na identificação de tendências na exploração e abundancia das principais espécies. O capitulo 3 aborda a vulnerabilidade deste grupo de espécies através do uso de diferentes métodos demográficos. Nossos resultados apontam que a maioria das espécies analisadas encontram-se depletadas e seriamente ameaçadas pela pesca de espinhel pelágico, que ainda nao dispõe de adequado monitoramento e controle no Atlantico Sul.
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Bruno, Carlos Eduardo Malavasi. "Análise morfológica da nadadeira do tubarão-azul, Prionace glauca, Linnaeus, 1758 (Carcharhiniformes: Elasmobranchii)." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/10/10132/tde-11062013-094219/.
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Tubarões e Raias pertencem à classe dos Chondrichthyes, por serem animais que possuem esqueleto cartilaginoso. O Tubarão-azul (Prionace glauca), popularmente conhecido como \"cação-azul\" dentre todas as espécies de tubarão é a mais abundante no ambiente marinho, podendo ser encontrado em toda a parte do mundo. O estudo teve como objetivo estudar a morfologia das nadadeiras do tubarão-azul (Prionace glauca) e os efeitos sobre células tumorais \"in vitro . Os resultados foram obtidos através da microscopia de luz e Citometria de fluxo. Com os caracteres encontrados na analise macroscópica foi possível identificar as nadadeiras obtidas como sendo do Tubarão-azul (Prionace glauca). A histologia da cartilagem da nadadeira do Tubarãoazul, demonstrou que é formada de cartilagem hialina, apresentando três regiões distintas, sendo no seu interior formado por condrócitos, na periferia de cartilagem calcificada e nas bordas formada por pericôndrio com a presença de colágeno tipo I,II e III. Os resultados obtidos das amostras do Elemento Radial não evidenciam alterações funcionais, quanto ao armazenamento, transporte e obtenção do suprimento celular, estes são viáveis e satisfatórios. O composto da cartilagem de tubarão para o tratamento de tumor \"in vitro\" neste estudo sugeriu que o mesmo apresenta uma atividade anti-tumoral significativa. Mostrou efeito tóxico sobre os tumores de mama murina (TAE) e tumor de mama canino (TMC) em baixas concentrações, não apresentando efeito tóxico nas células de fibroblasto nas mesmas concentrações.Sharks and rays belong to the Chondrichthyes Class, once they have cartilaginous skeleton. The blue shark (Prionaceglauca), popularly known as \"blue-cation\", among all shark species is the most abundant in the marine environment and can be found everywhere in the world. This study aimed to study the fin morphology in the blue shark (Prionaceglauca) and its effects on \"in vitro\" tumor cells. The results were obtained using light microscopy and flow cytometry. Using the gross morphology we confirm that the fins belonged to the blue shark (Prionaceglauca). The fin cartilage of the blue shark was formed of hyaline cartilage. It showed three distinct regions with chondrocytes inside, calcified cartilage in the periphery, and perichondrium with collagen type I, II and III in the margins. The results obtained from the Radial Element not showed functional changes as storage, transport and cellular supplies obtaining, they were feasible and satisfactory. The use of shark cartilage compound for the treatment of \"in vitro\" tumor cells suggested that it showed a significant anti-tumor activity. It showed a toxic effect on murine breast tumors (MBT) and canine breast tumor (CBT) at low concentrations, with no significant toxic effect on fibroblast cells using the same concentrations.
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Melo, Luana Felix de. "Desenvolvimento embríonário do fígado do Tubarão-azul, Prionace glauca (Linnaeus, 1758), Elasmobranchii, Carcharhiniformes." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/10/10132/tde-15062018-155713/.
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O Tubarão azul (Prionace glauca), popularmente conhecido como cação-azul dentre todas as espécies de tubarão é a mais abundante no ambiente marinho, podendo ser encontrado em todos os mares. Com a diversidade das espécies, a descrição de qualquer fígado especifico, dificilmente poderá ser utilizada como um modelo. Juntamente com essa variabilidade, algumas características fisiológicas dos peixes contribuem para ampliar seu polimorfismo hepático, entretanto pode ser considerado o ponto inicial para os estudos comparativos e filogenéticos entre os vertebrados. O fígado dos peixes aparece como em todos os outros vertebrados, como um órgão chave que vai controlar muitas funções vitais e realizar um papel proeminente na fisiologia dos peixes, tanto no anabolismo (proteínas, lipídios e carboidratos) e no catabolismo (nitrogênio, glicogenólises e desintoxicação). Por outro lado, deve ser considerado como um órgão alvo para muitos parâmetros biológicos e ambientais que podem alterar a estrutura e o metabolismo do fígado, como por exemplo, a alimentação, toxinas, parasitas, microrganismos e metais pesados acumulados. Nos peixes o fígado é localizado ventralmente na cavidade celomática, ajustando-se ao espaço disponível na cavidade do corpo. Foi realizada através da microscopia de luz e eletrônica de varredura a morfologia estrutural do desenvolvimento do fígado do tubarão azul nos 33 espécimes, divididos em diferentes tamanhos de embriões e fetos de 4 cm até 45 cm, comparados com um indivíduo adulto fêmea de 2 metros. A contagem de hepatócitos e vacúolos de gordura foi pela morfometria, através da técnica de pontos em fotomicrografias aleatórias. Nos resultados obtidos, pode-se notar que o fígado ocupava 20% do tamanho do animal. Microscopicamente, observou a presença de diferentes tamanhos de vacúolos de armazenamento de lipídio nos hepatócitos, diferença nas proporções de hepatócitos, linfócitos e vasos sanguíneos que diminui à medida que aumenta a estocagem de lipídios, consequentemente diminuindo a visibilidade da estrutura do fígado. Maior visualização de vacúolos translúcidos intracitoplasmáticos microgoticular aumentando gradativamente para macrogoticulares. Sugerindo assim que a presença de lipidios seja para manutenção dos filhotes, flutuabilidade e reserva energéticado animal, indicando que ele armazena gordura em seu fígado desde o início da embriogênese.The blue shark (Prionace glauca), popularly known as blue dogfish among all shark species is the most abundant in the marine environment, and can be found in all seas. With the diversity of species, the description of any specific liver can hardly be used as a model. Together with this variability, some physiological characteristics of the fish contribute to increase its hepatic polymorphism, however, it can be considered the starting point for comparative and phylogenetic studies among vertebrates. Fish liver appears as in all other vertebrates as a key organ that will control many vital functions and play a prominent role in fish physiology, both in anabolism (proteins, lipids and carbohydrates) and in catabolism (nitrogen, glycogenolysis and detoxification). On the other hand, it should be considered as a target organ for many biological and environmental parameters that can alter the structure and metabolism of the liver, such as food, toxins, parasites, microorganisms and accumulated heavy metals. In fish, the liver is located ventrally in the coelomic cavity, adjusting to the available space in the body cavity. The structural morphology of blue shark liver development in 33 specimens divided into different sizes of embryos and fetuses from 4 cm to 45 cm was compared to a female adult of 2 meters, using light microscopy and scanning electron microscopy. The counts of hepatocytes and fat vacuoles were by morphometry, using the technique of points in random photomicrographs. In the results obtained, it can be noted that the liver occupied 20% of the size of the animal. Microscopically, it observed the presence of different sizes of lipid storage vacuoles in hepatocytes, a difference in the proportions of hepatocytes, lymphocytes and blood vessels that decreases as lipid storage increases, consequently decreasing the visibility of the liver structure. Greater visualization of microcyticular intracytoplasmic translucent vacuoles gradually increasing for macrogoticulares. Thus suggesting that the presence of lipids is for the maintenance of the puppies, buoyancy and energy reserve of the animal, indicating that it stores fat in its liver from the beginning of embryogenesis.
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Bruno, Carlos Eduardo Malavasi. "Desenvolvimento embrionário dos órgãos linfoides do Tubarão-azul, Prionace glauca (Linnaeus, 1758), Elasmobranchii, Carcharhiniformes." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/10/10132/tde-21032017-150059/.
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O tubarão-azul, Prionace glauca (Linnaeus, 1758) é uma espécie cosmopolita, de alto valor comercial, principalmente capturado por embarcações que operam em alto mar e vendido em mercados e feiras-livres. Poucos dados biológicos estão disponíveis sobre esta espécie, principalmente quanto à sua sanidade e, o conhecimento do desenvolvimento de seus órgãos linfoides pode trazer importantes informações neste contexto. Desta forma, o objetivo do trabalho é descrever o desenvolvimento embrionário dos órgãos linfoides em embriões de tubarão-azul: timo, órgão epigonal, baço e órgão de Leydig, quanto à estrutura e arquitetura macroscópica, microscópica e ultraestrutural, pelas técnicas de microscopia de luz e eletrônica de transmissão. Foram coletados cinco espécimes de cada fase representativa do desenvolvimento embrionário: I, II, III e IV e do animal adulto. O timo foi visível macroscopicamente nas fases III e IV e microscopicamente da fase I a IV. O órgão de Leydig está presente nas fases II, III e IV. O baço e o órgão epigonal estão presentes em todas as fases embrionárias e no adulto. O timo apresentou principalmente populações de timócitos em diversos estágios de maturação e melanomacrófagos, o baço apresentou melanomacrófagos linfócitos em diversos estágios de maturação, neutrófilos, trombócitos e grande quantidade de eritrócitos. O órgão epigonal apresentou um grande número de células imaturas, principalemente de linfócitos e células polimorfonucleares. A função do órgão de Leydig é perdida quando adulta, sendo substituída pelo órgão epigonal. Os resultados desse trabalho permitem sugerir que esses órgãos apresentam uma função hematopoiética desde o inicio da embriogênese até a fase adulta.The blue shark (Prionace glauca) is a cosmopolitan species of high commercial value, easily caught by vessels operating on the high seas and sold in markets and street fairs. Few biological data are available on this species, mainly from their sanity. Studies on development of these lymphoid organs can provide important information in this regard. Thus, the aim of this study is to describe the gross, microscopic and ultraestrutural morphology of the embryonic development of lymphoid organs: thymus, epigonal organ, spleen and the Leydig organ by light microscopy and transmission electron techniques. Five specimens were collected from each representative stage of embryonic development: II, III and IV besides adult specimens. Thymus was visible macroscopically at phases III and IV and microscopically from phase I to IV. Leydig organ is presente in phases II, III and IV. Spleen and epigonal organ are present in all embrionic phases and adult. Thymus presented mainly thymocytes populations in several maturation stages and melanomacrophages, spleen presentes melanomacrophages and lymphocytes, neutrophyls, trombocytes and huge amount of erytrocytes. Epigonal organ presented many immature cells, mainly lymphocytes and polimorphonuclear cells. Leidigs organ function is lost in adulthood being replaced by the epigonal organ. The results of this work allow to suggest that these organs present a hematopoietic function since the early development until the adult phase.
Books on the topic "Elasmobranchii"
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K, Carlson John, and Goldman Kenneth J, eds. Special issue: Age and growth of chondrichthyan fishes : new methods, techniques and analysis. Dordrecht: Springer, 2006.
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Cappetta, Henri. Chondrichthyes II: Mesozoic and Cenozoic Elasmobranchii. Stuttgart: G. Fischer Verlag, 1987.
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Balai Riset Perikanan Laut (Indonesia). Sumber daya ikan elasmobranchii di Laut Jawa. [Jakarta]: Balai Riset Perikanan Laut, Pusat Riset Perikanan Tangkap, Badan Riset Kelautan dan Perikanan, 2005.
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Zangerl, Rainer. Comparative microscopic dental anatomy in the Petalodontida (Chondrichthyes, Elasmobranchii). [Chicago, Ill.]: Field Museum of Natural History, 1993.
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Rowe, Todd. Urolophus halleri: A proving of round stingray. Edited by Grill Yolande. [Phoenix, Ariz.?: The Author, 2000.
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Maisey, John G. Braincase of the Upper Devonian shark Cladodoides wildungensis (Chondrichthyes, Elasmobranchii), with observations on the braincase in early chondrichthyans. New York, NY: American Museum of Natural History, 2005.
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Shuttleworth, Trevor J., ed. Physiology of Elasmobranch Fishes. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73336-9.
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G, Raje S., and Central Marine Fisheries Research Institute., eds. Elasmobranch fisheries of India: An appraisal. Cochin: Central Marine Fisheries Research Institute, Indian Council of Agricultural Research, 2002.
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International, Symposium on Morphological Sciences (8th 1988 Rome Italy). Evolutionary and contemporary biology of elasmobranchs. New York, N.Y: A.R. Liss, 1989.
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C, Hamlett William, Tota Bruno, and International Symposium on Morphological Sciences (8th : 1988 : Rome, Italy), eds. Evolutionary and contemporary biology of elasmobranchs. New York: A.R. Liss, 1989.
Find full textBook chapters on the topic "Elasmobranchii"
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Ax, Peter. "Elasmobranchii — Holocephali." In Multicellular Animals, 195–200. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-08874-6_24.
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Mossman, Harland W. "Chondrichthyes (Elasmobranchii)." In Vertebrate Fetal Membranes, 27–32. London: Macmillan Education UK, 1987. http://dx.doi.org/10.1007/978-1-349-09065-5_4.
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da Costa, Luis M., Hugulay Albuquerque Maia, and Armando J. Almeida. "The Fishes of the Gulf of Guinea Oceanic Islands." In Biodiversity of the Gulf of Guinea Oceanic Islands, 431–78. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-06153-0_17.
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AbstractThis chapter reviews the current knowledge of the marine (including deep-sea species) and freshwater fishes of the Gulf of Guinea oceanic islands. Some biogeographic and conservation considerations are also presented. A total of 1045 species are likely present in the region, including 107 Elasmobranchii (37 confirmed, 65 potential, and 5 erroneous), one confirmed Holocephali, and 937 Actinopteri species (515 confirmed, 385 potential, 32 erroneous, and 5 questionable). Most of the coastal species are shared with the surrounding African continental shelf, while several species are amphi-Atlantic (present in both sides of the Atlantic Ocean), and some species have sister-species in the western Atlantic. A total of 15 species are endemic to the region, and 2 are introduced. Further studies are still needed to better understand the ichthyofauna of the Gulf of Guinea oceanic islands and help policymakers better define conservation and protection plans.
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Ballatori, Nazzareno, Gregory C. Connolly, and James L. Boyer. "Elasmobranch hepatocytes." In The Hepatocyte Review, 37–47. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-3345-8_5.
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Butler, P. J., and J. D. Metcalfe. "Cardiovascular and Respiratory Systems." In Physiology of Elasmobranch Fishes, 1–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73336-9_1.
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Callard, I. P., L. Klosterman, and Gloria V. Callard. "Reproductive Physiology." In Physiology of Elasmobranch Fishes, 277–317. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73336-9_10.
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Roberts, B. L. "The Central Nervous System." In Physiology of Elasmobranch Fishes, 49–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73336-9_2.
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Montgomery, J. C. "Sensory Physiology." In Physiology of Elasmobranch Fishes, 79–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73336-9_3.
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Bone, Q. "Muscles and Locomotion." In Physiology of Elasmobranch Fishes, 99–141. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73336-9_4.
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Nilsson, S., and S. Holmgren. "The Autonomic Nervous System." In Physiology of Elasmobranch Fishes, 143–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73336-9_5.
Full textConference papers on the topic "Elasmobranchii"
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Sokolskyi, Tymofii, and Guillaume Guinot. "ELASMOBRANCH (CHONDRICHTHYES: ELASMOBRANCHII) FAUNAL COMPLEX FROM LATE ALBIAN (EARLY CRETACEOUS) OF KANEV DISLOCATIONS, UKRAINE." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-320036.
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Hoffman, Brian L., and Scott A. Hageman. "PRELIMINARY ANALYSIS OF TEETH OF THE EXTINCT REQUIEM SHARK PHYSOGALEUS CONTORTUS (ELASMOBRANCHII: CARCHARHINIFORMES) AS CUTTING TOOLS." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-341034.
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Kalmijn, Ad J. "Graded Positive Feedback in Elasmobranch Ampullae of Lorenzini." In UNSOLVED PROBLEMS OF NOISE AND FLUCTUATIONS: UPoN 2002: Third International Conference on Unsolved Problems of Noise and Fluctuations in Physics, Biology, and High Technology. AIP, 2003. http://dx.doi.org/10.1063/1.1584884.
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Phillips, George E., and Gerard R. Case. "AN ELASMOBRANCH ASSEMBLAGE FROM THE DANIAN (EARLY PALEOCENE) OF MISSISSIPPI." In 68th Annual GSA Southeastern Section Meeting - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019se-326707.
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Shell, Ryan, Sergey Solonin, Alexey Vodorezov, and Robert Niedzwiedzki. "PRELIMINARY REPORT OF AN UPPER CRETACEOUS ELASMOBRANCH FAUNA FROM RYAZAN OBLAST, RUSSIA." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-355009.
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Gallo, Samira, Bakiu Rigers, Massimiliano Bottaro, Ilija Cetkovic, Samira Enajjar, Gianni Giglio, Luca Lanteri, et al. "Sigthings of large elasmobranchs from the Mediterranean: new data from MEDLEM database in the last five years (2017–2022)." In 2022 IEEE International Workshop on Metrology for the Sea; Learning to Measure Sea Health Parameters (MetroSea). IEEE, 2022. http://dx.doi.org/10.1109/metrosea55331.2022.9950984.
Full textReports on the topic "Elasmobranchii"
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Johns, M. J., C. R. Barnes, and M. J. Orchard. Taxonomy and biostratigraphy of Middle and Late Triassic elasmobranch ichthyoliths from northeastern British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1997. http://dx.doi.org/10.4095/209171.
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