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1 Morphology and Dynamics of Testicular Gametogenesis in Sympterygia Bonapartii
Morphology and dynamics of testicular gametogenesis in Sympterygia bonapartii (Chondrichthyes, Rajidae). Ana C. Moya; María C. Díaz Andrade & Elena J. Galíndez Lab. de Citología, Histología y Embriología Animal DBByF, UNS, San Juan 670, 8000, Bahía Blanca, Argentina - INBIOSUR-CONICET. E-mail: [email protected] ABSTRACT. Chondrichthyans constitute a successful group with a long and intricate evolutionary history that makes them highly vulnerable. The smallnose fanskate, Sympterygia bonapartii (MÜLLER & HENLE, 1841) is one of the most disembarked items in commercial harbors in Argentina. In this work, the microscopic architecture of mature male gonads and the dynamics of cysts development are analyzed as an interesting tool for understanding the reproductive biology of this specie. Some biological data related to reproduction are given as well. Two seasons were sampled (fall and spring) and length classes’ frequency distribution and maturity stages frequency distribution are given. LT 50 for males was estimated as 58.01 cm of total length. Testes are symmetric, peer, lobated, with several germinal zones. Inside the gonads, there are many spermatocysts, which contain reproductive cells at the same developmental stage. On the basis of their cytological and microanatomical features, seven maturative degrees of the spermatogenic series were differentiated. Few Leydig cells were recognized at the interstitial tissue between cysts. The microscopic quantitative analysis performed in this work provides a promising tool that may contribute to a better knowledge of the reproductive cycles of this economically and ecologically important species. 1 KEY WORDS: Histology, testis, smallnose fanskate, spermatogenesis. RESUMEN. Morfología y dinámica de la gametogénesis testicular en Sympterygia bonapartii (Chondrichthyes, Rajidae). -
Reproductive Biology of Sympterygia Bonapartii (Chondrichthyes: Rajiformes: Arhynchobatidae) in San Matías Gulf, Patagonia, Argentina
Neotropical Ichthyology, 15(1): e160022, 2017 Journal homepage: www.scielo.br/ni DOI: 10.1590/1982-0224-20160022 Published online: 03 April 2017 (ISSN 1982-0224) Printed: 31 March 2017 (ISSN 1679-6225) Reproductive biology of Sympterygia bonapartii (Chondrichthyes: Rajiformes: Arhynchobatidae) in San Matías Gulf, Patagonia, Argentina María L. Estalles1, María R. Perier2 and Edgardo E. Di Giácomo2 This study estimates and analyses the reproductive parameters and cycle of Sympterygia bonapartii in San Matías Gulf, northern Patagonia, Argentina. A total of 827 males and 1,299 females were analysed. Males ranged from 185 to 687 mm of total length (TL) and females from 180 to 742 mm TL. Sexual dimorphism was detected; females were larger, heavier, exhibited heavier livers, wider discs and matured at lager sizes than males. Immature females ranged from 180 to 625 mm TL, maturing females from 408 to 720 mm TL, mature ones from 514 to 742 mm TL and females with egg capsules from 580 to 730 mm TL. Immature males ranged from 185 to 545 mm TL, maturing ones from 410 to 620 mm TL and mature males from 505 to 687 mm TL. Size at which 50% of the skates reached maturity was estimated to be 545 mm TL for males and 594 mm TL for females. According to the reproductive indexes analysed, S. bonapartii exhibited a seasonal reproductive pattern. Mating may occur during winter-early spring and the egg-laying season, during spring and summer. Keywords: Elasmobranchii, Reproduction, Skate, South Western Atlantic Ocean. El presente estudio estima y analiza los parámetros reproductivos y el ciclo reproductivo de Sympterygia bonapartii en el Golfo San Matías, Patagonia norte, Argentina. -
Egg Capsules of the Filetail Fanskate Sympterygia Lima
Ichthyol Res (2013) 60:203–208 DOI 10.1007/s10228-012-0333-8 FULL PAPER Egg capsules of the Filetail fanskate Sympterygia lima (Poeppig 1835) (Rajiformes, Arhynchobatidae) from the southeastern Pacific Ocean, with observations on captive egg-laying Francisco Concha • Naitı´ Morales • Javiera Larraguibel Received: 31 October 2012 / Revised: 13 December 2012 / Accepted: 13 December 2012 / Published online: 6 February 2013 Ó The Ichthyological Society of Japan 2013 Abstract A total of 42 egg capsules of Sympterygia lima the Bignose fanskate, Sympterygia acuta (Garman 1877), are examined in this study. Freshly laid egg capsules are occurring exclusively from Brazil to Argentina; the pale yellow-brownish in color and turn to dark brown over Smallnose fanskate, Sympterygia bonapartii (Mu¨ller and time in sea water. Dorsal and ventral surfaces are soft and Henle 1841), ranging from the southwestern Atlantic to the slightly striated. Anterior horns are shorter than posterior Magellan Strait; the Shorttail fanskate, Sympterygia brev- and are arranged in parallel. Posterior horns transition into icaudata (Cope 1877) and the Filetail fanskate, Symptery- long coiled tendrils, which are the first to emerge through gia lima (Poeppig 1835), both restricted to Chilean coasts the cloaca during egg-laying. Notes on oviposition rates are (McEachran and Miyake 1990b; Pequen˜o and Lamilla discussed; these were shown to vary from 4 to 20 days, 1996; Pequen˜o 1997). Phylogenetic interrelationships and with two eggs being deposited each time. The presence of zoogeography within Sympterygia and its sister group, tendril-like posterior horns is not common in rajids. They Psammobatis Gu¨nther 1870 have been investigated by seem to occur only within the genus Sympterygia, McEachran and Miyake (1990a, b) and McEachran and becoming a useful character for distinguishing them from Dunn (1998). -
A Review of Longnose Skates Zearaja Chilensisand Dipturus Trachyderma (Rajiformes: Rajidae)
Univ. Sci. 2015, Vol. 20 (3): 321-359 doi: 10.11144/Javeriana.SC20-3.arol Freely available on line REVIEW ARTICLE A review of longnose skates Zearaja chilensis and Dipturus trachyderma (Rajiformes: Rajidae) Carolina Vargas-Caro1 , Carlos Bustamante1, Julio Lamilla2 , Michael B. Bennett1 Abstract Longnose skates may have a high intrinsic vulnerability among fishes due to their large body size, slow growth rates and relatively low fecundity, and their exploitation as fisheries target-species places their populations under considerable pressure. These skates are found circumglobally in subtropical and temperate coastal waters. Although longnose skates have been recorded for over 150 years in South America, the ability to assess the status of these species is still compromised by critical knowledge gaps. Based on a review of 185 publications, a comparative synthesis of the biology and ecology was conducted on two commercially important elasmobranchs in South American waters, the yellownose skate Zearaja chilensis and the roughskin skate Dipturus trachyderma; in order to examine and compare their taxonomy, distribution, fisheries, feeding habitats, reproduction, growth and longevity. There has been a marked increase in the number of published studies for both species since 2000, and especially after 2005, although some research topics remain poorly understood. Considering the external morphological similarities of longnose skates, especially when juvenile, and the potential niche overlap in both, depth and latitude it is recommended that reproductive seasonality, connectivity and population structure be assessed to ensure their long-term sustainability. Keywords: conservation biology; fishery; roughskin skate; South America; yellownose skate Introduction Edited by Juan Carlos Salcedo-Reyes & Andrés Felipe Navia Global threats to sharks, skates and rays have been 1. -
COMPARATIVE MORPHOLOGY and IDENTIFICATION of EGG CAPSULES of SKATE SPECIES of the GENERA Atlantoraja MENNI, 1972, Rioraja WHITLE
COMPARATIVE MORPHOLOGY AND IDENTIFICATION OF EGG CAPSULES OF SKATE SPECIES OF THE GENERA Atlantoraja MENNI, 1972, Rioraja WHITLEY, 1939 AND Sympterygia MÜLLER & HENLE, 1837 Arquivos de Ciências do Mar Morfologia comparativa e identificação de cápsulas do ovo das espécies de raias dos gêneros Atlantoraja Menni, 1972, Rioraja Whitley, 1939 e Sympterygia Müller & Henle, 1837 María Cristina Oddone1, Carolus Maria Vooren2 ABSTRACT A comparative study of the morphology of the egg capsule for six species of skates endemic to the southwestern Atlantic Ocean was carried out through literature review and analysis of new data. Egg capsules of Sympterygia acuta and S. bonapartii differ from those of genera Atlantoraja and Rioraja by their elongated, tendril-like posterior horns and their flat lateral margins. Egg capsules of the twoSympterygia species that occurring in the area in question differ from each other in size. In lateral view the egg capsule of Rioraja agassizi has convex ventral and dorsal faces, whereas in the three species of Atlantoraja the ventral face is flat. Within the genusAtlantoraja the most important taxonomical features for the identification of the capsules are the surface texture, the morphology of the velum and the capsule dimensions. The presence and location of attachment fibres is also an important character for capsules identification. Based on the aforementioned identification characteristics, a key to species for egg capsules of the six species is presented. Key Words: Rajidae, egg capsule, taxonomy, phylogeny, batoid. RESUMO Um estudo comparativo da morfologia das cápsulas ovígeras para seis espécies de raias endêmicas do Atlântico Sudocidental através de revisão de literatura e analise de novos dados é apresentado neste trabalho. -
Diversity of Empruthotrema Johnston and Tiegs, 1992 Parasitizing Batoids (Chondrichthyes: Rajiformes and Myliobatiformes) from T
Parasitology Research (2019) 118:3113–3127 https://doi.org/10.1007/s00436-019-06456-x FISH PARASITOLOGY - ORIGINAL PAPER Diversity of Empruthotrema Johnston and Tiegs, 1992 parasitizing batoids (Chondrichthyes: Rajiformes and Myliobatiformes) from the Southwest Atlantic Ocean, with description of three new species Manuel M. Irigoitia1 & Paola E. Braicovich1 & María A. Rossin1 & Delfina Canel1 & Eugenia Levy1 & Marisa D. Farber2 & Juan T. Timi1 Received: 3 May 2019 /Accepted: 4 September 2019 /Published online: 13 September 2019 # Springer-Verlag GmbH Germany, part of Springer Nature 2019 Abstract During an extensive research project involving 519 specimens of batoids, including 13 species of Rajiformes and Myliobatiformes (Chondrichthyes) from the Argentine Sea, three new species of Empruthotrema were found and are described using morphologic characteristics and two molecular markers: LSU rDNA and COI mtDNA. The new species can be distin- guished from their congeners by the number and distribution of the marginal loculi, the length and morphology of male copulatory organ, and the presence of eyespots. Additionally, multivariate analysis identified the dimensions of the pharynx and ejaculatory bulb as diagnostic features. Host specificity and previous records of the genus in the region are discussed. This is the first description of new species in this genus for the Southwestern Atlantic Ocean, as well as for arhynchobatid hosts. Keywords Empruthotrema aoneken . Empruthotrema orashken . Empruthotrema dorae . Rajiformes . Myliobatiformes . Argentine Sea Introduction (Myliobatidae) (Kuznetsova 1975) and of an unidentified spe- cies of Empruthotrema in Sympterygia bonapartii Muller and At present, Empruthotrema Johnston and Tiegs, 1922 com- Henle, 1841 (Rajiformes) (Irigoitia et al. 2017). prises nine valid species parasitizing batoids and sharks from Recently, the monophyly of the genus has been questioned different oceans. -
AC24 Inf. 5 (English and Spanish Only / Únicamente En Francés Y Español / Seulement En Anglais Et Espagnol)
AC24 Inf. 5 (English and Spanish only / únicamente en francés y español / seulement en anglais et espagnol) CONVENTION ON INTERNATIONAL TRADE IN ENDANGERED SPECIES OF WILD FAUNA AND FLORA ___________________ Twenty-fourth meeting of the Animals Committee Geneva, (Switzerland), 20-24 April 2009 SHARKS:CONSERVATION, FISHING AND INTERNATIONAL TRADE This information document has been submitted by Spain. * * The geographical designations employed in this document do not imply the expression of any opinion whatsoever on the part of the CITES Secretariat or the United Nations Environment Programme concerning the legal status of any country, territory, or area, or concerning the delimitation of its frontiers or boundaries. The responsibility for the contents of the document rests exclusively with its author. AC24 Inf. 5 – p. 1 Sharks: Conservation, Fishing and International Trade Norma Eréndira García Núñez GOBIERNO MINISTERIO DE ESPAÑA DE MEDIO AMBIENTE Y MEDIO RURAL Y MARINO Sharks: Conservation, Fishing and International Trade MINISTERIO GOBIERNO DE MEDIO AMBIENTE DE ESPAÑA Y MEDIO RURAL Y MARINO 2008 Ministerio de Medio Ambiente y Medio Rural y Marino. Catalogación de la Biblioteca Central GARCÍA NÚÑEZ, NORMA ERÉNDIRA Tiburones: conservación, pesca y comercio internacional = Sharks: conservation, fishing and international trade / Norma Eréndira García Núñez. — Madrid: Ministerio de Medio Ambiente y Medio Rural y Marino, 2008. — 236 p. : il. ; 30 cm ISBN 978-84-8320-474-0 1. TIBURON 2. ESPECIES EN PELIGRO DE EXTINCION 3. COMERCIO INTERNACIONAL 4. ECOLOGIA MARINA I. España. Ministerio de Medio Ambiente y Medio Rural y Marino II. Título 639.231 597.3 Cita: García Núñez, N.E. 2008, Tiburones: conservación, pesca y comercio internacional. -
Pontoporia Blainvillei
1 Taller Regional de Evaluación del Estado de Conservación de Especies para el Mar Patagónico según criterios de la Lista Roja de UICN: CONDRICTIOS. Buenos Aires, ARGENTINA - 2017 Results of the 2017 IUCN Regional Red List Workshop for Species of the Patagonian Sea: CHONDRICHTHYANS. Septiembre 2020 Con el apoyo de: 2 PARTICIPANTES DEL TALLER: Daniel Figueroa Universidad Nacional de Mar del Plata, Argentina. Departamento de Biología Marina y Millennium Nucleus for Ecology and Enzo Acuña Sustainable Management of Oceanic Islands (ESMOI), Universidad Católica del Norte, Larrondo 1281, Coquimbo, Chile. División Ictiología, Museo Argentino Ciencias Naturales Bernardino Gustavo Chiaramonte Rivadavia (MACN), Argentina. Wildlife Conservation Society, Programa Marino, Argentina. Universidad Juan Martín Cuevas Nacional de La Plata (UNLP), Argentina. Laura Paesch Dirección Nacional de Recursos Acuáticos DINARA, Uruguay Estación Hidrobiológica de Puerto Quequén. Museo Argentino Ciencias Marilú Estalles Naturales Bernardino Rivadavia (MACN), Argentina. Centro de Investigación Aplicada y Transferencia Tecnológica en Marina Coller Recursos Marinos Almirante Storni (CIMAS), Argentina. Mirta García Universidad Nacional de La Plata (UNLP), Argentina. Secretaría de Pesca, Provincia de Chubut. Instituto de Hidrobiología de Nelson Bovcon la UNPSB (Chubut), Argentina. CEPSUL, Instituto Chico Mendes de Conservação da Biodiversidade, Roberta Santos Aguiar Brasília, Brasil. Santiago Montealegre Quijano Universidade Estadual Paulista "Julio de Mesquita Filho" -
Boletim Pag1 Copy
N° 107 – ISSN 1808-1436 Londrina, 31 de Dezembro de 2013 EDITORIAL Prezados leitores, matérias para serem divulgadas neste Boletim. Na seção Destaques tivemos a contribuição dos sócios e participantes Ao findar mais um ano, é muito bom fazer um do Fifth International Conference of Pan African Fish and balanço e verificar que a ictiologia brasileira avançou Fisheries Association, que nos enviaram uma matéria muito bastante. No início do ano tivemos a satisfação de interessante, contendo informações do evento, de acompanhar o Encontro Brasileiro de Ictiologia, cujo expedições de coletas na região de Bujumbura e do povo de sucesso pode ser atribuído aos organizadores, participantes Burundi. Na seção Entrevista, tivemos a honra de conversar e patrocinadores. O número de inscritos no evento com Stanley H. Weitzman, um dos ictiólogos sistematas evidencia a magnitude da ictiologia nacional, cuja norte-americanos que muito contribuíram ao conhecimento excelente qualidade pode ser vista nos trabalhos dos peixes neotropicais e que continua em plena atividade. apresentados. Também pudemos acompanhar os artigos Em Comunicações publicamos a primeira parte do artigo publicados pela Neotropical Ichthyology, cujo fator de que trata da biografia dos pesquisadores que descreveram impacto também se deve à qualidade dos trabalhos. A peixes brasileiros no século XIX. No Peixe da Vez são publicação desses artigos, por sua vez, é decorrente da apresentadas novas informações a respeito de Atlantirivulus dedicação exaustiva do editor chefe e dos editores de área, depressus. Acreditamos que a remodelagem do Boletim, que não mediram esforços para manter a periodicidade dos com a criação de novas seções como a de entrevistas com fascículos. -
Ovarian Foliculogenesis in the Smallnose Fanskate Sympterygia Bonapartii (Müller & Henle, 1841) (Chondrichthyes, Rajidae)
Int. J. Morphol., 29(1):174-181, 2011. Ovarian Foliculogenesis in the Smallnose Fanskate Sympterygia bonapartii (Müller & Henle, 1841) (Chondrichthyes, Rajidae) Foliculogénesis Ovárica en la Raya Marmorada, Sympterygia bonapartii (Müller & Henle, 1841) (Chondrichthyes, Rajidae) *,**Díaz-Andrade, M. C.; *Galíndez, E. J.; **,***López-Cazorla, A. & *Estecondo, S. DÍAZ-ANDRADE, M. C.; GALÍNDEZ, E. J.; LÓPEZ-CAZORLA, A. & ESTECONDO, S. Ovarian foliculogenesis in the smallnose fanskate Sympterygia bonapartii (Müller & Henle, 1841) (Chondrichthyes, Rajidae). Int. J. Morphol., 29(1):174-181, 2011. SUMMARY: Chondrichthyes have become an important economic resource in the last decades, with Argentina as one of the countries that exploits more sharks and skates, even at levels that exceed de limits of many species. However, there is a scarce knowledge of the reproductive biology of this group, particularly from species inhabiting the Southern hemisphere. This work shows the most relevant facts during folliculogenesis in Sympterygia bonapartii. Results show that germinal cells are present in immature and maturing females. The most important facts that vary along de follicular development are the number of types and layers of follicular cells, the establishment of thin projections from the follicular cells and the degree of development of the thecae. Follicular cells are, at least, of two different types and both of them emit projections that break through the zona pellucida. The outer theca shows signs of synthetic activity. Atretic follicles of different sizes are present in exemplars of all the reproductive stages. These results are discussed in a physiological and adaptive context. KEY WORDS: Elasmobranchs; Reproduction; Ovary; Folliculogenesis; Sympterygia bonapartii. INTRODUCTION Chondrichthyes represent the oldest surviving jawed and is endemic to temperate waters of South America (Ebert vertebrates. -
Reproductive Biology of the Skates Sympterygia Acutagarman, 1877
Neotropical Ichthyology, 12(4): 771-782, 2014 Copyright © 2014 Sociedade Brasileira de Ictiologia DOI: 10.1590/1982-0224-20130097 Reproductive biology of the skates Sympterygia acuta Garman, 1877 and S. bonapartii Müller & Henle, 1841 (Chondrichthyes: Rajoidei) in south Brazil Alexander Basallo1 and Maria Cristina Oddone2 The present study analyzed the sexual development, sizes at maturity and morphometric relationships for both sexes of Sympterygia acuta and S. bonapartii, endemic of south-western Atlantic Ocean. The examined specimens were obtained through research cruises and commercial fishing trips, during 2011 and 2012, along the southern Brazilian coast, in latitudes ranging from 34°28’S to 31°29’S and at depths between 15 and 142 m. Significant differences (p<0.05) in S. bonapartii and in S acuta between sexes for the relationships total length (cm) - disc width (cm) and total length - total/eviscerated weight (g) respectively, demonstrated sexual dimorphism during the development in both species. The estimated size at maturity for males and females, respectively, were 46.1 and 44.7 cm, for S. acuta, and 58.4 and 59.9 cm, for S. bonapartii. A decrease in size at maturity for both sexes was observed in S. acuta and females of S. bonapartii of the southern coast of Brazil, respect to previous studies carried out over the last 30 years. O presente estudo analisou o desenvolvimento sexual, os tamanhos de maturidade e as relações morfométricas para ambos os sexos das espécies Sympterygia acuta e S. bonapartii endêmica do sudoeste do Oceano Atlântico. Os indivíduos foram coletados em cruzeiros de investigação e viagens de pesca comercial durante 2011 e 2012 ao longo da costa do Sul do Brasil em latitudes que variam de 34°28’S a 31° 29’S, e em profundidades entre 15 e 142 m. -
Guia Condrictios Pdf.Indd
Guía para el reconocimiento de: TIBURONES, RAYAS Y QUIMERAS DE CHILE Documento 18/ Noviembre 2005 Julio Lamilla G. Dr. en Ciencias Biológicas. Universidad Austral de Chile Carlos Bustamante D. Biólogo Marino (c). Universidad Austral de Chile www.oceana.org Prohibida su reproducción. Todos los derechos reservados. Registro de Propiedad Intelectual Nº 149.638. Como citar esta Guía: Lamilla, J. y C. Bustamante. 2005. Guía para el reconocimiento de: tiburones, rayas y quimeras de Chile. Oceana 17(nov. 2005):1-80 Guía para el reconocimiento de: TIBURONES, RAYAS Y QUIMERAS DE CHILE Julio Lamilla G. Dr. en Ciencias Biológicas Universidad Austral de Chile Carlos Bustamante D. Biólogo Marino (c) Universidad Austral de Chile Dibujos Originales Daniela Farías A. Bióloga Marina (c) Universidad Austral de Chile Edición Científica Antonia Fortt Z. Ingeniero Civil Ambiental Oceana Fotocomposición: Roberto Tapia T. En la fotografía, Tiburón sedoso, Tiburón martillo y Pez diablo. Edición Periodística Cristian Cabalin Q. Diseño Gráfico Roberto Tapia T. “Hay un misterio ignoto en este mar, cuyas palpitaciones suavemente terribles parecen indicar la presencia de algún alma escondida bajo el agua” Moby Dick. Herman Melville AGRADECIMIENTOS Los autores agradecen a todas aquellas personas involucradas en la elaboración de este proyecto tanto como revisores o por sus valiosas opiniones y correcciones. Julio Lamilla agradece, en primer lugar, a todos los estudiantes que se interesaron por trabajar con condrictios de todas las Universidades del país. También a los pescadores artesanales, dirigentes, sectorialistas, empresarios y colegas investigadores que comprenden hoy la importancia de la conservación y manejo de las pesquerías de condrictios. Carlos Bustamante agradece a mi familia, a Carlos y Ana Cecilia por el apoyo siempre en todas las decisiones.