Maria Cristina Oddone

• Professor
• Adjunct Professor at Federal University of Rio Grande

RESUMO O objetivo deste trabalho foi fazer a descrição dos dentículos dérmicos e utilizar estes como ferramenta de identificação taxonômica em espécimes de tubarões e raias processados para consumo humano. Os indivíduos são oriundos de apreensões realizadas por órgãos de fiscalização ambiental no período entre 2018 e 2020. Para análise dos dentícul...

Galeus mincaronei is endemic to the western Atlantic, occurring exclusively in Brazil. The species is still poorly known and regionally assessed as “Data Deficient” – DD. This work aimed to study the reproductive biology, size composition and distribution of G. mincaronei. A total of 79 specimens were analysed. Morphometric and reproductive measure...

The shortfin mako shark, Isurusoxyrinchus, plays essential ecological and economic roles in all oceans as a top predator and an important fishery resource. However, knowledge of its reproductive biology is still incomplete on a global basis, mainly due to a lack of sampling of mature females, particularly pregnant ones. In this paper, we studied th...

We describe for the first time in the Lago Colhué Huapi Formation (Coniacian–Maastricthian), south Central Patagonia, Argentina, continental bioerosion traces on dinosaur remains. Specifically, six different morphotypes, showing also different morphologic patterns, were identified. The preliminary identification of the trace makers include: crocody...

Preliminary findings regarding the reproduction of three neotropical freshwater stingray species, Potamotrygon henlei, P. motoro, and P. orbignyi, are presented herein. These species are characterized by the presence of a singular functional left ovary and two operational uteri. Two distinct fertility models have been identified: fecundity dependen...

This is a correction and reprint of Table 1 published on page 105 of the article “Diversity of the egg tertiary membranes in some elasmobranch species and comments on the actual yolk-sac viviparous reproductive mode”, published in the special issue Chondrichthyes of Revista de Biología Marina y Oceanografía 57(Especial): 102-121. <https://doi.org/1...

Sharks, rays, and chimeras have a limited fossil record compared to other taxa due to their predominantly cartilaginous skeletal structure. Fossilization tends to preserve anatomic structures such as teeth, scales, cephalic and caudal fins, and other fins. The Myliobatiformes order, derived from rays, is characterized by viviparity and distinctive...

Foi realizado um levantamento das espécies desembarcadas pela frota de pesca de arrasto de fundo do Rio Grande - RS entre os anos de 2001 e 2015. As amostragens ocorreram de modo descontínuo ao longo desse período. O intuito deste estudo foi elucidar a estrutura taxonômica do recurso “raia” na plataforma sul do Brasil, uma importante área para a re...

Nos peixes elasmobrânquios, a glândula oviducal é uma estrutura complexa, localizada entre o oviduto anterior e o útero. O presente estudo teve como objetivo conhecer os aspectos anatômicos e histológicos da glândula oviducal da fêmea adulta da raia Atlantoraja platana. Para cada amostra foram feitas as colorações AB (Alcian Blue) com pH 1,0 e 2,5;...

In this article, the capture of two pregnant females of the Brazilian Guitarfish, Pseudobatos horkelii, is recorded. Although the species is Critically Endangered and it capture is prohibited, the illegal catches occur nevertheless.

In this note the occurrence of an encapsulated embryo of Bathyraja brachyurops is reported. The embryo was in advanced stage of development. The capsule was collected after a bottom trawl operation, in the Argentinean-Uruguayan Common Fishing Zone, Southwest Atlantic, in September of 2000. After collection, the egg capsule was fixed in formalin 10%...

The Rio skate Rioraja agassizi is endemic to coastal waters of the Western South Atlantic. The species is common in the coasts of Argentina, Uruguay and Brazil. Previous studies performed in South Brazil, demonstrated that its hatched egg capsules are the most abundant among the co-occurring species. The aim of this study was to assess seasonality...

The crocodile shark, Pseudocarcharias kamoharai, is a species of ecological and economic importance in the marine ecosystems of Ecuador. Although it is a fishery resource for local consumption, biological and ecological information and appropriate fishery management are needed to allow its sustainable use. This research aimed to analyze the populat...

Abnormal embryonic development may result from mutations caused by genetics, environmental conditions or viruses. This study reports cases of cyclopia and a mouth malformation in two embryonic blue shark Prionace glauca collected off southern Brazil (South-western Atlantic). Such malformations are likely to reduce the chances of survival of embryos...

Sharks are cartilaginous fish that appeared 245 million years ago and became a highly diversified group, occupying several niches successfully. On the coast of Rio Grande do Sul, Brazil, shark fossils are commonly found ex situ associated with accumulations of biodetrital gravels along the current beach line. The present study consisted of a faunis...

After fertilization, elasmobranch eggs (mostly megalecithal) are encapsulated in a tertiary membrane of different complexity, in the oviducal gland. The gross morphological characteristics of this membrane in elasmobranchs are highly variable, attaining it most sophisticates’ forms within the oviparous species. The purpose of this study was to cont...

After fertilization, elasmobranch eggs (mostly megalecithal) are encapsulated in a tertiary membrane of different complexity, in the oviducal gland. The gross morphological characteristics of this membrane in elasmobranchs are highly variable, attaining it most sophisticates’ forms within the oviparous species. The purpose of this study was to cont...

Dermal denticles cover the skin of sharks for protection and may have additional functions, depending on the environment. The aim of the present study was to analyze the morphological pattern of dermal denticles across the body of the poorly known deep‐water catshark Galeus mincaronei, which is endemic to Southern Brazil. Additionally, we aimed to...

Latin American countries have a high diversity of sharks, rays, and chimaeras, yet many species are at high risk of extinction due to numerous threats. The conservation of chondrichthyans is key to achieving healthy and productive aquatic ecosystems, and countries in Latin America are increasingly recognizing the need for aligning conservation stra...

The present study analysed aspects of reproductive biology based on macroscopic and microscopic structures of whitespotted eagle ray Aetobatus narinari captured by artisanal fishing off the coast of Paraíba and Pernambuco (7° 30′ S, 34° 49′ W; 7° 47′ S, 34° 51′ W), northeast Brazil. Of the 71 individuals in the sample, 55% were female (disc width –...

Carolus Maria Vooren was a professor and researcher who worked at the Institute of Oceanography at the Universidade Federal do Rio Grande for 32 years. He worked in the area of Ecology, Biology and Population Dynamics of Chondrichthyan Fishes and Seabirds, being a pioneer in the studies of these two groups. He described three new species, a shark,...

Carolus Maria Vooren was a professor and researcher who worked at the Institute of Oceanography at the Universidade Federal do Rio Grande for 32 years. He worked in the area of Ecology, Biology and Population Dynamics of Chondrichthyan Fishes and Seabirds, being a pioneer in the studies of these two groups. He described three new species, a shark,...

The Rasptail skate Rostroraja velezi is commercially exploited in artisanal elasmobranch fisheries along the west coast of Baja California Sur, Mexico, but information on its life history is limited. This study aimed to investigate the reproductive biology of R. velezi. A total of 105 specimens were caught from April 2008 to May 2012, including the...

The reproductive biology and embryonic development of Mustelus higmani were examined between January 2015 and December 2016 in the southeastern Caribbean. Captures comprised 813 females (23.2-72.5 cm TL), and 960 males (22.6-62.5 cm TL). The total length at 50% maturity was estimated as 47.8 and 47.5 cm for females and males, respectively. Uterine...

Knowledge of reproductive parameters is necessary to efficiently evaluate and manage fishing stocks. Shortfin Mako constitutes the second most captured shark by the longline hook fleet situated in Rio Grande, RS, Brazil. However, little is known about the reproductive traits or abundance of this species in the Southwest Atlantic. Here we report on...

RESUMO Atlantoraja castelnaui (Arhynchobatidae) possui uma distribuição que vai do Rio de Janeiro ao norte da Argentina. O objetivo deste trabalho foi descrever a morfologia dentária da A. castelnaui, e avaliar a presença de mudanças ontogenéticas e dimorfismo sexual na dentição. De modo geral, a descrição morfológica dos dentes se remete à região...

The Angular Angelshark (Squatina guggenheim) is a small demersal shark that reaches a maximum total length of 95 cm total length and inhabits soft sediments from 10 to 80 m depth on the continental shelf in the Southwest Atlantic from Rio de Janeiro, Brazil, to northern Patagonia, Argentina. Threats to this species include being caught as bycatch i...

In this paper the occurrence of an immature female specimen of the Blurred Smooth Lanternshark, Etmopterus bigelowi is reported. The individual was caught by a longline vessel using a bottom hook on March 20 th , 2014, off South Brazil. RESUMEN Ocurrencia del tiburón lucero liso, Etmopterus bigelowi Shirai & Tachikawa 1993 (Squaliformes, Dalatiidae...

Of the 85 species of chondrichthyans recorded from the continental shelf of Rio Grande do Sul and/or from the adjacent oceanic area, 48 are sharks, 35 are batoids and two are chimaeras. In order to justify the conservation of that elasmobranch fauna as a whole, a review is presented of the available information on the reproductive mode and the spat...

The California butterfly ray Gymnura marmorata is frequently caught by artisanal fisheries in north‐western Mexico (Baja California Sur; BCS). The aim of this study was to estimate reproductive characteristics and describe the micro and macroscopic reproductive structures of female and male G. marmorata. Sampling was carried out at two fisheries la...

On Cassino beach, Rio Grande do Sul, Brazil, thousands of hatched cases of Rajoidei (suborder of oviparous skates) are brought by the tides being exposed on the seashore. The objective of this work was to analyze the egg cases taxonomic diversity and the occurrence frequency of the present taxa. The egg cases used in the study come from manual coll...

In this paper the occurrence of two specimens of the elephant fish, Callorhinchus callorynchus is recorded. Despite being common off Uruguay and Argentina, the species is occasionally caught in South Brazil. As a consequence, information on the populations of this species is not available.

Assim como em outros vertebrados derivados, o aparelho reprodutor masculino em condrictes é composto por os testículos (incluindo a glândula epigonal) e dutos reprodutivos. Estes últimos incluem dutos eferentes, epidídimo, glândula de Leydig, duto deferente e vesícula seminal. As raias S. acuta e S. bonapartii são endêmicas do Oceano Atlântico Sul...

This study presents information on the reproductive biology of Psammobatis rutrum based on 55 males and 53 females obtained as by-catch from bottom trawlers off southern Brazil during July 2013 and September 2014 and includes a detailed description of the egg capsule. Total lengths (LT) ranged from 22·3 to 31·6 cm and most of the sample comprised l...

Este trabajo analizó las relaciones largo-masa, crecimiento en talla, variaciones en masa y dinámica de consumo del saco vitelino de embriones de Mustelus schmitti extraídos de hembras capturadas por la flota pesquera artesanal del puerto de La Paloma (34°39'S, 54°10'W, Uruguay) durante 2006 y 2007. Las diferencias en largo total y masa total entre...

Squalus acanthias has been poorly studied in Uruguay, though reproductive studies have been carried out in Argentina in the decades of 1970-1980. The aim of this work was to analyze the population structure and the reproductive biology of S. acanthias along the Uruguayan continental shelf (south-western Atlantic Ocean) between 1995 and 2010. Total...

A beach seine operation was witnessed in Cassino Beach, Rio Grande do Sul coast, Brazil, with a discard of 178 individuals of Myliobatis goodei and M. ridens in one haul. Individuals had 44.0-84.0 cm of disc width. This species and fisheries need long-term monitoring and managing.

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 d...

Egg capsules of Zearaja chilensis were obtained from individuals kept in captivity and from dead specimens captured in Valparaíso Bay, central Chile. One female under laboratory conditions deposited three pairs of egg capsules in 6 days. The egg capsules of Dipturus trachyderma were obtained from a female captured in Valdivia, south Chile. Fresh eg...

Freshwater stingrays, or potamotrygonids, are restricted to Neotropical river drainages. These elasmobranchs are well adapted to freshwater environments and the number of described species gradually increases as further research is carried out. Some of the first studies on their systematics and natural history were carried out in the 1960s and 1970...

Between 2000 and 2002, three artisanal landing sites were sampled in southern Chile, with data on population structure and reproductive development collected from 5477 yellownose skates Zearaja chilensis. Total length (L(T) ) ranged from 33 to 158 cm for females and 34 to 155 cm for males. No sexual dimorphism was evident in disc size (length or wi...

A total of 483 specimens (236 males and 247 females) of the brown ray Raja miraletus were collected off the coast of Senegal (eastern tropical Atlantic). The hepatosomatic index (HSI) and gonadosomatic index (GSI) were calculated in both males and females, and the oviducosomatic index (OSI) in females. Both HSI and GSI increased significantly with...

A total of 483 specimens (236 males and 247 females) of the brown ray Raja miraletus were collected off the coast of Senegal (eastern tropical Atlantic). The hepatosomatic index (HSI) and gonadosomatic index (GSI) were calculated in both males and females, and the oviducosomatic index (OSI) in females. Both HSI and GSI increased significantly with...

The external morphology of the egg capsule of Bythaelurus canescens and its fixation to the substratum are described. Bythaelurus canescens egg capsules are typically vase-shaped, dorso-ventrally flattened, pale yellow in colour when fresh and covered by 12-15 longitudinal ridges. The anterior border of the capsule is straight, whereas the posterio...

A total of 1 893 males and 1 124 females of Squalus mitsukurii were collected from latitudes 34o 30' S and 37o 00' S, in the south-western Atlantic Ocean, during early autumn, late autumn and spring 1995, early autumn 1996 and early autumn 1998. Length-frequency distributions significantly varied between sexes for all seasons (P<0.05). Mature males...

En diciembre de 2005 se recolectaron cápsulas ovígeras de dos hembras de Psammobatis scobina, capturadas en Caleta Montemar, Chile central (32º57�S-71º33�W). La superficie de las cápsulas fue suave y finamente estriada, de color café y translúcida. Además presentaron la típica forma de barril. La longitud central fluctuó entre 35,25 mm y 38,45 mm y...

An abnormal hermaphroditic (intersexual) pelagic stingray Pteroplatytrygon violacea (Bonaparte, 1832) was captured off the southern coast of Brazil. The adult specimen was 470 mm disc width, 880 mm total length and 2440 g total weight. The right clasper was rigid, elongated and 115 mm in length while the left clasper was absent. The dissection of t...

En diciembre de 2005 se recolectaron cápsulas ovígeras de dos hembras de Psammobatis scobina, capturadas en Caleta Montemar, Chile central (32º57’S-71º33’W). La superficie de las cápsulas fue suave y finamente estriada, de color café y translúcida. Además presentaron la típica forma de barril. La longitud central fluctuó entre 35,25 mm y 38,45 mm y...

In this paper, the authors report morphological abnormalities observed in six species of skates and rays from off southeastern Brazil, between 2005 and 2008 as follows: the rio skate, Rioraja agassizi (Müller and Henle, 1841); the spotback skate, Atlantoraja castelnaui (Ribeiro, 1907); the eyespot skate, A. cyclophora (Regan, 1903); the pelagic sti...

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...

The softnose skates Bathyraja brachyurops and Bathyraja macloviana represent an important portion of the skate catches of the Uruguayan trawling fleet in the southwestern Atlantic. From March to October 2004, specimens of these species were collected at 75–200 m depth range in the area situated between latitudes 37°00′–39°30′S. For B. brachyurops,...

Specimens of Atlantoraja castelnaui were obtained from seven commercial fishing vessels operating in southeastern Brazilian waters, from March 2005 to April 2006. A total of 53 males, ranging from 17.9 to 111.0 cm in total length (TL), were examined. Based on analyses of the clasper gland and clasper length, testes weight, testicular lobes diameter...

Specimens of Atlantoraja castelnaui were obtained from seven commercial fishing vessels overating in southeastern Brazilian waters, from March 2005 to April 2006. A total of 53 males, ranging from 17.9 to 111.0 cm in total length (TL) were examined. Based on analyses ot the clasper gland and clasper length, testes weight, testicular lobes diameter...

Specimens o/Atlantoraja cyclophora were collected monthly from commercial fishing landings at Guarujá, São Paulo State, Brazil, from March 2005 to April 2006 at depths between 10 and 146 m. Males ranged from 13.3 to 58.5 cm TL (n = 396). Both the smallest mature male and the largest immature male were 47.0 cm long. Males' size-at-50% maturity was c...

The sexual development of Atlantoraja platana from the south-west Atlantic Ocean was analysed. According to the reproductive variables considered for both sexes, males were found to mature at 620 mm and females at 715 mm total length.

A total of 3518 specimens (1607 males, 1911 females) of Dipturus chilensis were sampled. Males ranged from 44.0 to 99.Ocm and females from 45.0 to 110.0 cm. Total length composition of the grouped catches differed significantly among sexes, with females being larger than males. The sex ratio favored the females. The total length at which 50% of the...

Four records of potamotrygonids in the Uruguay River and its tributaries in Paysandú, Uruguay are reported in this paper. The first one was a specimen caught in 1934, of undetermined sex and weighing 120 kg and with a disc width of ca 150 cm. The second specimen, caught in 1998, was also of undetermined sex; it weighed 50 kg total weight and its di...

During the present study, 107 specimens of Atlantoraja castelnaui, 188 of A. platana, and 770 of A. cyclophora, were obtained by commercial vessels operating in Southeastern Brazil from March 2005 to April 2006. Males of A. castelnaui ranged from 17.9-111.0 cm and females from 17.4-116.0 cm total length. Males of A. platana ranged from 13.1-70.0 cm...

Specimens of Rioraja agassizi were collected at Guarujá pier, São Paulo State, Brazil, from March 2005 to March 2006. A total of 275 males were captured. Based on the analysis of the clasper length, gonad weight, clasper gland length, alar thorns and lobule diameter, the size-at-maturity was estimated to be 32 cm. There were 1049 females in the rec...

Specimens of Rioraja agassizi were collected at Guarujá pier, São Paulo State, Brazil, from March 2005 to March 2006. A total of 275 males were captured. Based on the analysis of the clasper length, gonad weight, clasper gland length, alar thorns and lobule diameter, the size-at-maturity was estimated to be 32 cm. There were 1049 females in the rec...

A total number of 4824 Mustelus schmitti was sampled. Females ranged from 25 to 93 cm in spring and from 28 to 90 cm in summer. Males ranged from 34 to 82 and from 28 to 77 cm, respectively. Length composition of the population showed significant differences between spring and summer being females larger than males. Total length distribution did no...

Specimens of Rioraja agassizi were collected monthly off Santos, Southeast Brazil, between latitudes 23 degrees 37'S and 27 degrees 40'S, from March, 2005 to March, 2006. A total number of 278 males and 1023 females were captured. Observed depth range was 10120 m, being the species absent above 120 m. Sex ratio significantly favored females. The en...

An ecotrophic model of the neritic ecosystem of southern Brazil was developed and some strategies for elasmobranch fishes exploitation were analyzed using Ecopath with Ecosim. Fisheries policy optimization analysis showed that the elasmobranchs are badly affected by almost all fishing fleets, thus management and conservation actions must take this...

Freshly collected egg capsules of Rioraja agassizi were light and bright brown in colour, laterally keeled and symmetrically convex with a smooth configuration of the surface. The base of the horns, the lateral margins and the ventral wall of the egg capsules were covered by sticky, shiny yellow attaching fibrils. The mean total length of the egg c...

The population structure and reproductive biology of Mustelus schmitti was analysed during autumn (1994, 1995) and spring (1994) in the Rio de la Plata oceanic front. The samples consisted mainly of adult males and immature females, indicating that nursery areas are situated elsewhere. In autumn, the highest female densities occurred between 36°S a...

A total of 459 (245 females, 214 males) Atlantoraja cyclophora was captured by bottom trawl off the coast of Rio Grande do Sul between 30°40′S and 34°30′S during surveys conducted in winter 2001 and summer/autumn 2002 at depths of 100-300 m. Total length at maturity was 52.8 cm for females and 48.5 cm for males. Symmetry and functional parity of th...

Total length (TL) at first sexual maturity was estimated for Atlantoraja castelnaui and Dipturus chilensis from the south-western Atlantic Ocean. Total length at which 50% of the females were captured (50% c) was less than the TL at first sexual maturity (ML) in both species. Immature females are being captured and thus will not become sexually mat...

The microscopic structure of the egg capsules of Atlantoraja cyclophora, a species endemic to the Atlantic region of South America, is presented in this paper. In a transverse section, the dorsal face of the egg case is 70mu in width, and is subdivided into four layers. Ventrally, the egg capsule wall is 60 mu wide and composed of three layers. Bot...

A total of 459 individuals of Atlantoraja cyclophora were captured along the Rio Grande do Sul coast between latitudes 30º40'S and 34º30'S. Two surveys were performed, in the winter 2001 and in the summer/autumn 2002, using bottom-trawl between the depths of 100 and 600 m. This species occurred between 100 and 300 m deep, without significant differ...

The smallnose fanskate Sympterygia bonapartii is found in coastal and shelf waters between southern Brazil and southern Argentina. Since 1994 it has become an alternative and commercially important target of demersal fisheries. In Uruguayan waters, the onset of sexual maturity in the species is at 65.5 cm for females and at 50–57 cm for males.

Egg capsules of Atlantoraja cyclophora and A. platana are asymmetrical, dorsally convex and ventrally flat, with longitudinally striated faces. Those of other rajoid genera occurring in Cassino Beach ( Rio Grande do Sul State, Brazil), Psammobatis, Sympterygia and Rioraja, are equally convex in lateral view, and have smooth faces. In Atlantoraja th...

Egg capsules of Atlantoraja cyclophora and A. platana are asymmetrical, dorsally convex and ventrally flat, with longitudinally striated faces. Those of other rajoid genera occurring in Cassino Beach (Rio Grande do Sul State, Brazil), Psammobatis, Sympterygia and Rioraja, are equally convex in lateral view, and have smooth faces. In Atlantoraja the...

In order to allow growth comparisons and the indirect estimation of some of the von Bertalanffy growth model's parameters (specifically K or L¥), growth parameters and growth performance index (F¢) of 13 populations of 11 Ariidae catfish species are here presented and analysed. Some previously published data were re-analysed with non- linear regres...

RESUMEN Se registró la presencia de un macho de la mantarraya Manta birostris (Donndorff 1798) en la desembocadura del arroyo Pando (34º 48' S-55º 43' O), Río de la Plata, Uruguay. El ancho del disco fue de 4.20 m con un peso estimado de 900 kg. Este hallazgo es el primer registro de M. birostris para las costas uruguayas y representa una ampliació...

Ten egg-cases of Sympterygia acuta were collected from the surf line at Cassino Beach, Rio Grande do Sul, Brazil, and incubated in the laboratory. The egg-cases and neonates (77–84 mm total length) are described.

Ten egg-cases of Sympterygia acuta were collected from the surf line at Cassino Beach, Rio Grande do Sul, Brazil, and incubated in the laboratory. The egg-cases and neonates (77 84 mm total length) are described.