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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" (UNESP), Brasil. Verónica García Fundación Vida Silvestre Argentina (FVSA), Argentina. COLABORADORES: Carlos Bustamante (Facultad de Ciencias del Mar y Recursos Biológicos, Universidad de Antofagasta, Chile. Co-Regional Vice Chair, Western South America Regional Group, IUCN SSC Shark Specialist Group) y Joost Pompert (Georgia Seafood Company, Is. Malvinas/Falklands Isl.) EXPERTO IUCN: Beth Polidoro REVISION Y EDICIÓN: Juan Martín Cuevas y Valeria Falabella DISEÑO Y ARTE: Victoria Zavattieri Wildlife Conservation Society CARTOGRAFÍA: Valeria Falabella Wildlife Conservation Society DIRECCIÓN: Claudio Campagna Wildlife Conservation Society COORDINACIÓN: Juan Martín Cuevas Wildlife Conservation Society 3 CITA: Cuevas, J.M., García, V., Montealegre Quijano, S., Paesch, L., Estalles, M., Falabella, V., Santos, R., Bovcon, N., Chiaramonte, G., Coller, M., Figueroa, D., García, M, Acuña, E., Bustamante, C. Pompert, J. & Campagna, C. 2020. Informe del Taller Regional de Evaluación del Estado de Conservación de Especies para el Mar Patagónico según criterios de la Lista Roja de UICN: Condrictios. Foro para la Conservación del Mar Patagónico y áreas de influencia. 302 pp. Citation: Cuevas, J.M., García, V., Montealegre Quijano, S., Paesch, L., Estalles, M., Falabella, V., Santos, R., Bovcon, N., Chiaramonte, G., Coller, M., Figueroa, D., García, M, Acuña, E., Bustamante, C. Pompert, J. & Campagna, C. 2020. Report of the IUCN Regional Red List Workshop for Species of the Patagonian Sea: Chondrichthyans. Forum for the Conservation of the Patagonian Sea. 302 pp. 4 INDICE: Amblyraja doellojuradoi Raya erizo _ 6 Atlantoraja castelnaui Raya pintada _14 Atlantoraja cyclophora Raya ojona _ 22 Atlantoraja platana Raya oscura _ 28 Bathyraja albomaculata Raya de manchas blancas _ 36 Bathyraja brachyurops Raya de cola corta _ 44 Bathyraja cousseauae Raya de aletas juntas _ 54 Bathyraja griseocauda Raya lija _ 60 Bathyraja macloviana Raya espinosa _ 68 Bathyraja scaphiops Raya picuda _ 76 Callorhinchus callorynchus Pez gallo_ 84 Carcharhinus brachyurus Tiburón bacota _ 92 Carcharias taurus Tiburón escalandrún_ 104 Dipturus trachyderma - Raya Espinuda_114 Discopyge tschudii Raya eléctrica_124 Galeorhinus galeus Cazón_132 Gymnura altavela Raya mariposa_146 Lamna nasus Tiburón sardinero_154 Mustelus fasciatus Gatuzo a rayas_168 Mustelus schmitti Gatuzo_174 Myliobatis goodei Chucho_184 Notorynchus cepedianus Gatopardo_192 Psammobatis bergi Raya reticulada_198 Pseudobatos horkelii Guitarra grande_204 Rioraja agassizii Raya lisa_212 Schroederichthys bivius Pintaroja_220 Squalus acanthias Espinillo_228 Squalus mitsukurii Cazón espinoso_240 Squatina argentina Pez ángel de aleta larga_246 Squatina guggenheim Pez ángel espinoso_252 Sympterygia acuta Raya marrón oscuro_260 5 Sympterygia bonapartii Raya marmorada_266 Tetronarce puelcha Torpedo_276 Zapteryx brevirostris Guitarra chica_282 Zearaja chilensis Raya picuda_290 6 LC Least Concern, (IUCN version 3.1) Assessment Rationale: The Southern Thorny Skate Amblyraja doellojuradoi is a medium-sized skate (up to 69 cm TL) endemic to the Patagonian Sea. Found from Uruguayan waters to southern Chile and around Malvinas/Falkland Islands. Around the Malvinas/Falkland Islands the species is a small component in the multispecies skate fishery. There was a gradual decrease in the size of specimens taken in this fishery between 1993 and 1997 although the data were often sparse. Following fishery declines in the early 1990s, the southern area of the Islands was closed to the commercial ray fleet and fishing now only occurs north of 52°S. An assessment of the northern ray population has indicated that the CPUE of A. doellojuradoi has increased from 1992 to 2001. There have been no assessments yet of the population in the southern area of the Islands since the fishery closure and the species may still be subject to bycatch pressure by deepwater teleost trawlers in this area. Documented population trends do not exist for the rest of the species' distribution. It was a regular bycatch of deeper water benthic trawl fisheries targeting Merluccius hubbsi and Dissostichus eleginoides off Argentina however there are no species-specific bycatch estimates available for these fisheries. This species is assessed as Least Concern because it is common and there is no evidence of generalized decline; moreover, there are reports of increases in CPUE over some of the species' range, although the magnitude of these increases is difficult to assess. The expansion of fishing pressure in deeper waters could increase takes of this species as bycatch. Assessor(s): Acuña, E., Bovcon, N., Figueroa, D. & Paesch, L. Contributor(s): Bustamante, C. & Pompert, J. Facilitators: Polidoro, B., Falabella, V. Compilers: García, V., & Cuevas, J.M. 7 Taxonomic information ANIMALIA - CHORDATA - CHONDRICHTHYES - RAJIFORMES - RAJIDAE - Amblyraja doellojuradoi (Pozzi, 1935) Common Names: Southern Thorny Skate (English), Raya (Spanish; Castilian), Raya Erizo (Spanish; Castilian) Geographic Range The Southern Thorny Skate Amblyraja doellojuradoi is an endemic species of the Patagonian Sea found from southern Uruguayan waters to southern Chile and around Malvinas/Falkland Islands (Ebert, 2016, Cousseau et al., 2007, Perier et al., 2011). 8 Population There are no species-specific bycatch estimates and therefore no population trend available for this species in the Patagonian Sea. In Falkland/Malvinas Islands observer data for the species showed no significant trends in abundance between 1993 and 1997 (Agnew et al. 2000). Mean disc width gradually decreased from 1993 to 1997 although the data were often sparse (Agnew et al. 2000). The Wakeford et al. (2004) assessment of the northern ray population, based on observer data, indicated that the CPUE of A. doellojuradoi increased from 1992 to 2001. Amblyraja doellojuradoi comprised 2.4% of the catch from the northern area of the fishery between 1993 and 2002 (Wakeford et al. 2004) while in 2016 it comprised 3.9% of the total capture weight of 21 fishing vessels (Winter et al., 2015). Population trend: unknown. Habitats and Ecology Amblyraja doellojuradoi is a medium-sized benthic species distributed in deep temperate waters of the continental shelf and slope. It was reported at depths from 51 to 642 m in bottom temperatures ranging from 2.5°C to 6.8°C (Menni and Stehmann 2000), and off Punta Arenas, Chile at 185 m depth and between 105 m and 1640 m around Malvinas/Falklands Islands (Joost Pompert pers. comm. 2017). This species has been recorded from 57 m to 323 m depth over the continental shelf (Laura Paesch and Gustavo Chiaramonte pers comm. 2017). Males mature at 44.8 cm and females at 41.1 cm (Delpiani, 2016). No sexual dimorphism was observed in the total length at maturity at which 50% of individuals were sexually mature. Reproduction might occur throughout the year with peaks in autumn (Delpiani, 2016). Diet is based mainly on crabs and to a lesser extent on polychaetes, teleosts, isopods, and other invertebrates. Ontogenetic diet changes include increased consumption of crabs as animals grow and decreased feeding on polychaetes and other invertebrates (Delpiani et al., 2013). Threats Amblyraja doellojuradoi is a by-cath species of bottom trawl fisheries of Uruguay targeting argentine hake Merluccius hubbsi (Paesch and Lorenzo, 2017). It is also a bycatch species in bottom trawl fisheries of Argentina targeting vertebrates and invertebrates such as the patagonic scallop fishery (Zygochlamys patagonica) (Schejter et al. 2012). It has been captured during fishery-independent investigations on hake and other species in the past (García de la Rosa et al. 1999). Off Argentina, the great depth range of the species offers it some refuge beyond the depth 9 of current fishing pressure, however, especially as fisheries expand into greater depths, there is a need for close monitoring and the collection of species-specific catch and bycatch data where none currently exists. This species
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  • Stock Status Report 2016

    Stock Status Report 2016

    SKATES – Familia Rajidae About twenty species of the Family Rajidae (Class Chondrichthyes) are distributed in the Treaty area. Commonly known as skates, these species constitute, together with the narrownose smoothhoundand the angular angel shark, the most exploited chondrichthyans of the region. Considering their geographical distribution and the fisheries to which they are subject, two groups can be established: coastal skates and deepwater skates. The coastal skates inhabit the coastal strip of the Treaty area, between 34° and 39° S and from the coast to 50 m depth. It is composed of at least 9 species (Sympterygia bonapartii, S. acuta, Atlantoraja castelnaui, A. cyclophora, Psammobatis bergi, P. extenta, P. rutrum, Rioraja agassizi and Zearaja flavirostris (= Z. chilensis, = Dipturus chilensis). It should be mentioned that the species S. bonapartii and Z. flavirostris have a wide geographic distribution in the maritime areas south of 34° S, including both the coastal region and the deeper one. However, the highest abundances of S. bonapartii occur at depths less than 50 m, while Z. flavirostris, the most important of all the skate from the commercial point of view, is concentrated especially at depths greater than 50 m. A third species, Psammobatis lentiginosa, inhabit in an intermediate region between the two previous or ecotone, close to the 50 m isobath, between 34° and 42° S. In the Treaty area the coastal skates are captured by the fleet Argentine coast that operates on the multispecific fishery called "variado costero" and by the Uruguayan fleet Category B. The others species of the Family Rajidae, which inhabit in the average and external continental shelf of the ZCP, are included in the group deepwater skates.