Gustavo E. Chiaramonte

• Dr.
• Managing Director EHPQ - Head of Ichthyology - Fish Curator at Museo Argentino de Ciencias Naturales "Bernardino Rivadavia" - Consejo Nacional de Investigaciones Científicas y Técnicas

Strandings of juvenile porbeagles are recurrent in the South West Atlantic (SWA). We provide new biological information and explore to which haplogroups the juveniles may belong. Fourteen stranding events occurred between May 2009 and May 2022 on porbeagle in the beaches of the SWA Argentine coast were identified. Based on a 2019 beached specimen,...

This study reports variations found along a latitudinal gradient in relative growth and life history traits in a shark. The present work focuses on proving that individuals from the southern distribution of the shark Mustelus schmitti will be larger and mature to larger sizes than individuals from the northern distribution. We also show that inters...

El gatuzo, Mustelus schmitti (Carcharhiniformes, Triakidae) es un tiburón endémico del Océano Atlántico Sudoccidental y está catalogado como en peligro crítico por la UICN. La edad y el crecimiento de M. schmitti se estudiaron utilizando cortes sagitales de vértebras de 102 hembras y 121 machos capturados incidentalmente por la pesquería de langost...

We present the first complete and commented list of the ichthyofauna of the Ría Deseado (47°45´S, 65°55´W) and record the southernmost limit distribution of five species. The systematic checklist comprises 44 species belonging to 4 classes, 15 orders, 26 families, and 35 genera. The largest Families are Nototheniidae (8) and Zoarcidae (6). The icht...

In the Argentine Sea there are about 35 species of sharks. Three species are subjected to directed fishing: the smoothhound Mustelus schmitti, the school shark Galeorhinus galeus and the copper shark Carcharhinus brachyurus. Other species of elasmobranchs with commercial importance are the angel shark Squatina spp. and several species of skates and...

El Equipo Costero de Observadores de Fauna y Ambiente Marinos (ECOFAM) es un programa de ciencia ciudadana que promueve, a través de la participación de voluntarios de comunidades locales, la generación de información de calidad sobre el ambiente y fauna marina en el litoral atlántico de Argentina. Durante los dos primeros años de actividades en la...

Ernesto Guevara, conocido como “El Che”, fue uno de los ideólogos y comandantes de la Revolución Cubana de 1959. A pesar de su fama, poco se sabe sobre su vida antes de sus estudios universitarios y posiblemente uno de los hechos menos conocidos sea su participación en el Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” (MACN). Durante...

The lectotype specimen of Bryconamericus rubropictus (Berg) and its designation have remained imprecisely documented since its publication. The lack of a photograph or an unambiguous illustration, correct size, inaccurate labelling, and proper specimen separation has led to an uncertainty about the identity and nomenclatural status of the lectotype...

En el presente artículo se describen los procesos de cambio y adaptaciones que se produjeron en el Museo de Fauna Regional de la Estación Hidrobiológica de Puerto Quequén desde diciembre de 1999 a la actualidad debido a factores internos y externos, cambios y adaptaciones que proponemos como sucesos inscriptos en el concepto de resiliencia cultural...

In 2019, the tribute cycle called “Pioneers: the female scientists of the Museo Argentino de Ciencias Naturales” began as a new way of making notorious the role of women in science. This cycle, carried out by women of the Museum, seeks to recognize and honor the first women dedicated to scientific activities at the Institution. This fourth edition...

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...

El gatuzo Mustelus schmitti, es un tiburón vivíparo aplacentario del Océano Atlántico Sudoccidental. En la gestación (11–12 meses) los embriones alojados en los úteros se nutren inicialmente del saco vitelino y luego de secreciones de origen materno mediante un proceso de transferencia de nutrientes aún no elucidado. Las crías nacen con 25,0 – 27,5...

Palabras clave: peces cartilaginosos, pesca, GAMM, esfuerzo de captura

Regional migration of the copper shark Carcharhinus brachyurus was recorded for the first time in the Southwest Atlantic (SWA) from Argentina (latitude: –38.1037, longitude: –57.5371) to Brazil (latitude: –20.6833, longitude: –40.2846) as a result of a citizen science tagging project. The recaptured specimen was a female (103 kg weight), with 18 de...

Contributions for the strategic planning of the conservation of the Carcharias taurus (sand tiger shark) in the Southwestern Atlantic. Este es el informe de dos talleres sobre la conservación del tiburón Carcharias taurus (sand tiger shark, mangona, escaladrún, sarda), organizados en el año de 2020, para una planificación colectiva de acciones de...

The Multispine Skate (Bathyraja multispinis) is a medium-sized (to 126 cm total length) skate that occurs in the Southeast Pacific Ocean from Coquimbo, Chile to Cape Horn and in the Southwest Atlantic Ocean from Santa Catarina, Brazil to Tierra del Fuego and the Falkland Islands (Malvinas) and is demersal on the continental and insular shelves and...

The Broadnose Skate (Bathyraja brachyurops) is a medium-sized (to 125 cm total length) skate that occurs in the Southeast Pacific and Southwest Atlantic Oceans from Biobío, Chile, south around Cape Horn and north to Rio Grande do Sul, Brazil, including the Falkland Islands (Malvinas). It is demersal on the inner continental shelf and upper slope at...

The Whitedotted Skate (Bathryraja albomaculata) is a large (to 150 cm total length) skate that occurs in the Southeast Pacific and Southwest Atlantic Oceans from Coquimbo, Chile south around Cape Horn and north to Uruguay, including the Falkland Islands (Malvinas) and the Burdwood Bank, and is demersal on the inshore continental shelf and upper slo...

The Greytail Skate (Bathyraja griseocauda) is a large (to 157 cm total length) skate that occurs in the Southeast Pacific and Southwest Atlantic Oceans from Coquimbo, Chile south around Cape Horn and north to Uruguay, including the Falkland Islands (Malvinas), and is demersal on the mid-continental shelf and upper slope at depths of 30–1,010 m. It...

The Patagonian Skate (Bathyraja macloviana) is a small (to 71 cm total length) skate that occurs in the Southeast Pacific Ocean off Magallanes, Chile and in the Southwest Atlantic Ocean from Uruguay to Tierra del Fuego, Argentina and the Falkland Islands (Malvinas) and is demersal on the inner continental shelf and upper slope at depths of 50–515 m...

The Narrowmouth Catshark (Schroederichthys bivius) is a small (to 82 cm total Length) catshark that occurs in the Southeast Pacific and Southwest Atlantic from Valdivia, Chile, south around Cape Horn and north to southern Brazil. It is demersal on the continental shelf and upper slope at depths of 12–359 m (mostly <130 m). It is occasionally caught...

The Southern Thorny Skate (Amblyraja doellojuradoi) is a small (to 69 cm total length) deepwater skate that occurs in the Southeast Atlantic Ocean from Uruguay to Southern Argentina and the Burdwood Bank, including the Falkland Islands (Malvinas). It is demersal on the mid- and outer continental shelf and upper slope at depths of 50–1,000 m. This s...

The Darkbelly Skate (Bathyraja meridionalis) is a large (to 158 cm total length) that occurs in the Southeast Pacific Ocean off Magallanes Province, Chile, in the Southwest Atlantic Ocean from Buenos Aires to Tierra del Fuego, Argentina and westward to the Falkland Islands (Malvinas), and in the Antarctic Atlantic Ocean around the Shag Rocks and So...

The Magellan Skate (Bathyraja magellanica) is a medium-sized (to 105 cm total length) skate that occurs in the Southeast Pacific Ocean from Puerto Montt, Chile to Cape Horn and in the Southwest Atlantic Ocean from San Matías Gulf to Tierra del Fuego, Argentina, off the Falkland Islands (Malvinas), and on the Burdwood Bank. It is demersal on the con...

IUCN Redlist

Results of the 2017 IUCN Regional Red List Workshop for Species of the Patagonian Sea: CHONDRICHTHYANS.

Results of the 2017 IUCN Regional Red List Workshop for Species of the Patagonian Sea: CHONDRICHTHYANS, with 35 species of rays, skates and sharks listed: Amblyraja doellojuradoi; Atlantoraja castelnaui; Atlantoraja cyclophora; Atlantoraja platana; Bathyraja albomaculata; Bathyraja brachyurops; Bathyraja cousseauae; Bathyraja griseocauda; Bathyraja...

Predictive regression equations were generated to estimate total length of the Argentine seabass (A. patachonicus) using skull and pectoral girdle bones, specific body and otolith lengths. Regressions of skull and pectoral girdle bones, specific body and otolith lengths were all statistically significant. Generating regressions of the bony and exte...

The Thintail Skate (Dipturus leptocaudus) is a medium-sized (to 88 cm total length) skate that occurs in the Southwest Atlantic from Santa Catarina, Brazil to Uruguay (and possibly Argentina). It inhabits the continental shelf and upper slope at depths of 10–550 m. It is captured in commercial deep-water trawl, longline, and gillnet fisheries, whic...

The Lesser Numbfish (Narcine brasiliensis) is a small (to 45 cm total length) ray that occurs in the Southwest Atlantic from southern Brazil to Buenos Aires Province, Argentina. It is benthic on soft substrates of the continental shelf at depths of 6–60 m. It is captured in intense and largely unmanaged commercial and artisanal trawl and beach sein...

The Southern Eagle Ray (Myliobatis goodei) is a medium-sized (to at least 115 cm DW) coastal eagle ray that occurs in the Western Central and Southwest Atlantic Oceans from South Carolina and Florida, USA and Quintana Roo, Mexico to San Jorge Gulf, Santa Cruz, Argentina. It inhabits continental shelves from inshore to depths of 181 m. It is capture...

The Shortnose Eagle Ray (Myliobatis ridens) is a medium-sized (to 70 cm disc width) ray that occurs in the Southwest Atlantic from Santa Catarina, Brazil, to Buenos Aires Province, Argentina. It inhabits inshore bays and estuaries at depths of 5–47 m. It is captured in intense and largely unmanaged artisanal gillnet and beach seine fisheries throug...

The Bullnose Eagle Ray (Myliobatis freminvillii) is a medium-sized (to 106 cm disc width) demersal coastal eagle ray that occurs in the Northwest, Western Central, and Southwest Atlantic Oceans from Massachussetts, USA to the Texas coast of the Gulf of Mexico and from Venezuela to Buenos Aires, Argentina and inhabits continental shelves from the su...

The Freckled Catshark (Scyliorhinus haeckelii) is a small (to 57 cm total length) shark that occurs in the Southwest Atlantic from Bahia, Brazil to northern Argentina. It inhabits the continental shelf and upper slope at depths of 37–402 m, and is often associated with deep-water reefs. This catshark is captured in artisanal and commercial trawl, g...

Castello's Apron Numbfish (Discopyge castelloi) is a small (to at least 31 cm total length) ray that occurs in the Southwest Atlantic from Necochea, Buenos Aires, to Camarones, Chubut, Argentina. It inhabits the inner continental shelf at depths of 35–56 m. Its depth range suggests that it is exposed to commercial and artisanal demersal trawl fishe...

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...

Carlos Berg (1843–1902) was one of the most important zoologists in South America, and a key figure in the development of the collections and organisation of the former Museo Nacional de Buenos Aires (macn). Responsible for the creation of the Ichthyology Division there (1895), his name is also forever linked to Argentinian fish studies. In additio...

The Argentine Angelshark (Squatina argentina) is a small (to 138 cm total length) demersal shark species that occurs in waters in the Southwest Atlantic from Santa Catarina, Brazil, south to Buenos Aires, Argentina. This species inhabits sandy substrates at depths of 51-320 m. The species has a relatively slow life history, giving birth to 7-11 pup...

Es bien conocido el alto grado de vulnerabilidad de los condrictios a los efectos de la pesca. El 49% de las especies de tiburones de la Argentina ha sido evaluada entre las categorías IUCN de especies amenazadas (33% Vulnerable, 9% En Peligro y 7% Peligro Crítico). Una medida para mitigar las causas que conducen a esta situación ha sido la creació...

Bahía San Blás (Northern Patagonia, Argentina) is an important shark breeding ground in the Southwest Atlantic, including endemic species. It was declared in 2001 as a MPA with multiple uses including small scale fisheries. Although artisanal fishing was allowed to continue in the area after its protection and included in its Management Plan in 200...

The aim of this work is to make a contribution to the knowledge of the state of condition and reproductive cycle of the moraine (Gymnotus omarorum) of Laguna Blanca, Pilcomayo River National Park (PNR P) in the province of Formosa. Gymnotus omarorum Richer-de-Forges, Crampton & Albert, 2009 is captured by members of “The Spring” Qom Community at La...

Background: Angelsharks (Genus Squatina) are distributed in the southern Southwest Atlantic Ocean between southeastern Brazil and central Patagonia. The endangered hidden angelshark Squatina occulta is reported in the literature as ranging from Espírito Santo, Brazil to Southern Uruguay. Its presence in Argentine waters has been suspected but not v...

This work summarily reviews the evidence of the existence of different populations of school shark Galeorhinus galeus globally; it updates the taxonomy of the species as well as discussing the theoretical pertinence of a single population in the South West Atlantic ocean. It summarizes the conservation status of the species in the area and reports...

Se estudia estacionalmente la biología reproductiva de Squalus acanthias por medio del análisis de la morfología corporal, la proporción de los estadios de madurez sexual y la variación de los parámetros reproductivos. Los ejemplares fueron obtenidos de la pesca artesanal desde octubre de 2007 hasta febrero de 2009. Sólo se obtuvieron muestras en i...

A description of the historical development of the Colección Nacional de Ictiología deposited at the Ichthyological Division of the Museo Argentino de Ciencias Naturales B. Rivadavia, reviewing the contributions of leading researchers who worked on it. The current conservation status and the amount of total lots housed, quantity of type specimens,...

The aim of this work is to make a contribution to the knowledge of the state of condition and reproductive cycle of the moraine (Gymnotus omarorum) of Laguna Blanca, Pilcomayo River National Park (PNRP) in the province of Formosa. Gymnotus omarorum Richer-de-Forges, Crampton & Albert, 2009 is captured by members of "The Spring" Qom Community at Lag...

The exploitation of elasmobranchs in Argentina reached the same levels that conducted some species to the extinction in other fisheries around the world. Although some species show strong evidences of declines (school shark, sand-tiger shark, copper shark, and some species of skates), few and soft actions were adopted by the national fisheries auth...

Se analiza la importancia relativa del recurso rayas para las distintas flotas que operan en el Mar Argentino. Las flotas Fresquera y Costera producen masas de desembarque semejantes –45% cada una del total desembarcado– y el 10% restante corresponde a la flota Congeladora. De la Costera implica el 9,9% de sus desembarques de peces, de la Fresquera...

Two dates of publication have been associated with the hidden angelshark Squatina occulta. Additionally, the name of the second author of this species has been cited with different spellings in different publications. Both inconsistencies are addressed in this study. It is suggested that the hidden angelshark be consistently cited as Squatina occul...

Argentinean Sharks Tagging Manual The manual has three main parts: 1) Project history and objectives; previous recommendations before starting the tagging process, tips to ensure the survival of the shark and an explanation of the tagging process step by step; 2) Identification sheets for 16 different species of Argentinean sharks with original art...

The double–beam trawl fishery for the Patagonian red shrimp (Pleoticus muelleri) is the main crustacean fishery of the Southwestern Atlantic Ocean. The shark bycatch in 723 tows of this fishery was surveyed from April 2003 to October 2003. Six species of sharks were recorded: Squalus acanthias (n=321); Squalus mitsukurii (n=1); Squatina sp. (n=1);...

The double–beam trawl fishery for the Patagonian red shrimp (Pleoticus muelleri) is the main crustacean fishery of the Southwestern Atlantic Ocean. The shark bycatch in 723 tows of this fishery was surveyed from April 2003 to October 2003. Six species of sharks were recorded: Squalus acanthias (n=321); Squalus mitsukurii (n=1); Squatina sp. (n=1);...

Between 2004 and 2007, tournament editions and the recreational fishery for the broadnose seven-gill shark, Notorynchus cepedianus, were monitored in Natural Reserves of Ría Deseado (RD, a breeding area for the Patagonian smooth hound) and Peninsula de San Julian (SJ), southern Patagonia, Argentina. Sharks' catch composition by sex; total length (T...

Se presentan los resultados de las primeras experiencias de pesca deportiva con devolución del tiburón gatopardo (Notorhynchus cepedianus), realizadas entre 2004 y 2009 en las reservas naturales Ría de Deseado y Península de San Julián (provincia de Santa Cruz, Patagonia, Argentina), como un avance hacia buenas prácticas de pesca deportiva en la zo...

SummaryA total of 230 specimens of the skate, Rioraja agassizii, was collected from the commercial bottom trawl fishery of Puerto Quequén, Argentina. During the warmer seasons greater proportions of females were sampled. The largest male and female sampled were 629 and 698 mm total length (TL), respectively. Sexual dimorphism was detected in the re...

A higher resolution of the type specimen of Discopyge castelloi when captured along with other specimens of Discopyge tschudii. This image was provided by Gustavo Chiaramonte and it was included in the species description, but herein is presented again in a broader view.

Temporal and sexual effects in feeding ecology were examined in the marbled sand skate (Psammobatis bergi). Of 137 stomachs analysed, 130 (95%) contained food. Among these, >50% contained between 2 and 4 items, with a maximum of 18 prey items found. Thirty taxonomic levels of prey items were identified: 18 crustaceans, 5 polychaetes, 3 molluscs, 3...

Elasmobranchs have become an important element of the bycatch in the fisheries worldwide and an important resource for most of Argentine trawl fisheries. This work is the first analysis of the diversity of batoid fishes in the bycatch of the Argentine coastal fisheries. Between July 1998 and June 2000, an onboard observer program was carried out an...

The reproductive biology of Psammobatis bergi was investigated based on 92 males and 136 females skates taken from the coastal bottom trawl fishery at Puerto Quequén, Argentina. The relationship between total body mass and total length (TL) was not significantly different between sexes, but females were heavier than males. Minimum length at maturit...

The reproductive biology of M. schmitti collected from the commercial bottom trawl fishery operating in Puerto Quequén, Argentina is investigated in the present study. The specimens were sampled seasonally during 2003–2004. The number of sharks collected was 637 (298 males and 339 females), including 190 pregnant females with 1,103 embryos. Size ra...

This paper provides an overview of the research being carried out at the moment by a group of Argentinean scientists working on the subjects of marine biodiversity and oceanography. When the idea of the Census of Marine Life (CoML) was proposed following the Symposium held during the IAPSO-IABO conference in Mar del Plata in October 2001, there was...

In male sand skate Psammobatis extenta, from the commercial fishery of Puerto Quequén, Argentina, six of 13 proportional dimensions analysed were constant (isometric) with total length, while seven proportions remained constant in females. The nature of the allometric and isometric relationships of disc length, disc width, interspiracular distance...

Psammobatis extenta collected from the commercial bottom trawl fishery operating in Puerto Quequén, Argentina, between 2000 and 2001, had a sex ratio of 1:1 (535 specimens). Both the largest male and female measured 313 mm total length (LT). The relationship between total body mass and LT was significantly different between sexes; mature females we...

Psammobatis extenta is a common off-shore member of the South American skate fauna and its biology is poorly known. Aspects of the biology of P. extenta were investigated using data collected from bycatch of commercial trawls in February 2000 off the coast of Puerto Quequén, Argentina. The maximum size attained by females was 313 mm T L and 295 mm...

Psammobatis extenta is a common off-shore member of the South American skate fauna and its biology is poorly known. Aspects of the biology of P. extenta were investigated using data collected from bycatch of commercial trawls in February 2000 off the coast of Puerto Quequén, Argentina. The maximum size attained by females was 313 mm TL and 295 mm T...

The relationship of body weight and total length (L(T)) of Mustelus schmitti in southern Patagonia was different between sexes. Changes in maturity stages in males appear at larger sizes in Ria Deseado specimens than in the Mar del Plata area. Mature females ranged from 795 to 913 mm while all male specimens >759 mm L(T) were mature. The data sugge...

The relationship of body weight and total length (LT) of Mustelus schmitti in southern Patagonia was different between sexes. Changes in maturity stages in males appear at larger sizes in Ría Deseado specimens than in the Mar del Plata area. Mature females ranged from 795 to 913 mm while all male specimens >759 mm LT were mature. The data suggest t...

The purpose of this contribution is to review the species of the shark genus Carcharhinus found along the coast of Argentina. New southern limits for the distribution of the genus are given for the western South Atlantic. The presence of Carcharhinus leucas (Valenciennes, 1839) is recorded for the first time on the Province of Buenos Aires coast. N...

Placental characters are described tor Carcharhinus brachyurus (Günther, 1870) and , for the first time, the presence of an only common zone of placentation in the uterus is described in carcharhinid sharks. Consigns the maximum registration of the number of embryos per litter for the species: 24.