A new record of Hexanchus griseus is reported for the coast of Argentina in Patagonia (45° 36´32.73´´S - 67° 16´ 33.68 W) at a depth of 19 m and with water temperature at 15.4°C. The specimen was a female captured, tagged and released inside a Marine Protected Area by local recreational fishermen as part of a national citizen science project. The specimen was a juvenile of 284.1 cm total length and it also constitutes the first tagged individual in the Southwest Atlantic Ocean for this species. Keywords: Hexanchus griseus, sixgill shark, Argentina, recreational fishery, citizen science, tagging, juvenile.

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 developing embryos within the uterus. The total distance was at least 2566 km, and it is the longest ever recorded for the species. Furthermore, it extends its northern distribution in the SWA.

Knowledge of the three-dimensional movement patterns of elasmobranchs is vital to understand their ecological roles and exposure to anthropogenic pressures. To date, comparative studies among species at global scales have mostly focused on horizontal movements. Our study addresses the knowledge gap of vertical movements by compiling the first global synthesis of vertical habitat use by elasmobranchs from data obtained by deployment of 989 biotelemetry tags on 38 elasmobranch species. Elasmobranchs displayed high intra- and interspecific variability in vertical movement patterns. Substantial vertical overlap was observed for many epipelagic elasmobranchs, indicating an increased likelihood to display spatial overlap, biologically interact, and share similar risk to anthropogenic threats that vary on a vertical gradient. We highlight the critical next steps toward incorporating vertical movement into global management and monitoring strategies for elasmobranchs, emphasizing the need to address geographic and taxonomic biases in deployments and to concurrently consider both horizontal and vertical movements.

We report the southernmost known occurrence in the Atlantic Ocean of the striped smooth-hound, Mustelus fasciatus (Garman, 1913). The shark, a female measuring 106 cm TL, was fished in warm coastal waters, with a salinity of 33,189 PSU, of central Argentina (40°52ʹ13ʺ S, 062°18ʹ42ʺ W). This report increases by 205 km southward the known range of this endemic and Critically Endangered species.

The tope shark (Galeorhinus galeus Linnaeus, 1758) is a temperate, coastal hound shark found in the Atlantic and Indo-Pacific oceans. In this study, the population structure of Galeorhinus galeus was determined across the entire Southern Hemisphere, where the species is heavily targeted by commercial fisheries, as well as locally, along the South African coastline. Analysis was conducted on a total of 185 samples using 19 microsatellite markers and a 671 bp fragment of the NADH dehydrogenase subunit 2 (ND2) gene. Across the Southern Hemisphere, three geographically distinct clades were recovered, including one from South America (Argentina, Chile), one from Africa (all the South African collections) and an Australia-New Zealand clade. Nuclear data revealed significant population subdivisions (FST = 0.192 to 0.376, p<0.05) indicating limited gene flow for tope sharks across ocean basins. Marked population connectivity was however evident across the Indian Ocean based on Bayesian clustering analysis. More locally in South Africa, F-statistics and multivariate analysis supported moderate to high gene flow across the Atlantic/Indian Ocean boundary (FST = 0.035 to 0.044, p<0.05), with exception of samples from Struisbaai and Port Elizabeth which differed significantly from the rest. Discriminant and Bayesian clustering analysis indicated admixture in all sampling populations, decreasing from west to east, corroborating possible restriction to gene flow across regional oceanographic barriers. Mitochondrial sequence data recovered seven haplotypes (h = 0.216, π = 0.001) for South Africa, with one major haplotype shared by 87% of the individuals and at least one private haplotype for each sampling location except Port Elizabeth. As with many other coastal shark species with cosmopolitan distribution, this study confirms the lack of both historical dispersal and inter-oceanic gene flow while also implicating contemporary factors such as oceanic currents and thermal fronts to drive local genetic structure of G. galeus on a smaller spatial scale.

Journal of Applied IchthyologyVolume 32, Issue 1 p. 123-125 Short Communication First record of bigeye thresher shark (Alopias supercillosus Lowe, 1841) and new record of thresher shark [Alopias vulpinus (Bonnaterre, 1788)] (Chondrichthyes, Alopiidae) from Argentina J. M. Cuevas, Corresponding Author J. M. Cuevas División Zoología Vertebrados, Museo de la Plata, Universidad Nacional de La Plata, Buenos Aires, Argentina Instituto de Medio Ambiente, Universidad Nacional de la Matanza, Buenos Aires, Argentina Author's address: Juan Martín Cuevas, División Zoología Vertebrados, Museo de la Plata, Universidad Nacional de La Plata, Avenida 7 776, 1900 La Plata, Buenos Aires, Argentina. E-mail: [email protected]Search for more papers by this authorM. García, M. García División Zoología Vertebrados, Museo de la Plata, Universidad Nacional de La Plata, Buenos Aires, ArgentinaSearch for more papers by this author J. M. Cuevas, Corresponding Author J. M. Cuevas División Zoología Vertebrados, Museo de la Plata, Universidad Nacional de La Plata, Buenos Aires, Argentina Instituto de Medio Ambiente, Universidad Nacional de la Matanza, Buenos Aires, Argentina Author's address: Juan Martín Cuevas, División Zoología Vertebrados, Museo de la Plata, Universidad Nacional de La Plata, Avenida 7 776, 1900 La Plata, Buenos Aires, Argentina. E-mail: [email protected]Search for more papers by this authorM. García, M. García División Zoología Vertebrados, Museo de la Plata, Universidad Nacional de La Plata, Buenos Aires, ArgentinaSearch for more papers by this author First published: 07 November 2015 https://doi.org/10.1111/jai.12945Citations: 1Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat References Amorim, A. F.; Arfelli, C. A.; Fagundes, L., 1998: Pelagic elasmobranchs caught by longliners off southern Brazil during 1974-97: an overview. Mar. Freshw. Res. 49, 621–632. Bedford, D., 1992: Thresher shark. 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Citing Literature Volume32, Issue1February 2016Pages 123-125 ReferencesRelatedInformation