Peces Anuales de la Argentina.

"Peces anuales" son los especies con un corto ciclo de vida, adaptadas a sobrevivir en aguas temporarias

Use of the neotropical fish Cnesterodon decemmaculatus for long-term control of Culex pipiens L. in Argentina

We released the native mosquito fish, Cnesterodon decemmaculatus, into suburban 37 drainage ditches to evaluate its potential as a long-acting agent for the control of CulexCnesterodon decemmaculatus, into suburban 37 drainage ditches to evaluate its potential as a long-acting agent for the control of CulexCulex 38 pipiens larvae in natural breeding sites. The inoculation of predatory fish was conducted in 9 ditches at three densities: 1, 7, and 13 fish/m2 39 during a 2-year period (2006—2008). 40 The number of immature stages of Cx. pipiens was recorded before and after release. On 41 a monthly basis, the digestive-tract contents of some fish and the average number of 42 offspring from the females was recorded. Fifteen weeks after release, a 99% reduction 43 in the number of immature mosquito stages was recorded in the drainage ditches containing 13 fish/m244 , while at 22 weeks, a 99% reduction was also observed in those with 7 fish/m2. The ditches with 1 fish/m2 45 had lower densities of immature mosquito 46 stages relative to the controls, but over the entire experiment these observations did not 47 prove statistically significant. The number of offspring per adult C. decemmaculatuspipiens larvae in natural breeding sites. The inoculation of predatory fish was conducted in 9 ditches at three densities: 1, 7, and 13 fish/m2 39 during a 2-year period (2006—2008). 40 The number of immature stages of Cx. pipiens was recorded before and after release. On 41 a monthly basis, the digestive-tract contents of some fish and the average number of 42 offspring from the females was recorded. Fifteen weeks after release, a 99% reduction 43 in the number of immature mosquito stages was recorded in the drainage ditches containing 13 fish/m244 , while at 22 weeks, a 99% reduction was also observed in those with 7 fish/m2. The ditches with 1 fish/m2 45 had lower densities of immature mosquito 46 stages relative to the controls, but over the entire experiment these observations did not 47 prove statistically significant. The number of offspring per adult C. decemmaculatus2 39 during a 2-year period (2006—2008). 40 The number of immature stages of Cx. pipiens was recorded before and after release. On 41 a monthly basis, the digestive-tract contents of some fish and the average number of 42 offspring from the females was recorded. Fifteen weeks after release, a 99% reduction 43 in the number of immature mosquito stages was recorded in the drainage ditches containing 13 fish/m244 , while at 22 weeks, a 99% reduction was also observed in those with 7 fish/m2. The ditches with 1 fish/m2 45 had lower densities of immature mosquito 46 stages relative to the controls, but over the entire experiment these observations did not 47 prove statistically significant. The number of offspring per adult C. decemmaculatusCx. pipiens was recorded before and after release. On 41 a monthly basis, the digestive-tract contents of some fish and the average number of 42 offspring from the females was recorded. Fifteen weeks after release, a 99% reduction 43 in the number of immature mosquito stages was recorded in the drainage ditches containing 13 fish/m244 , while at 22 weeks, a 99% reduction was also observed in those with 7 fish/m2. The ditches with 1 fish/m2 45 had lower densities of immature mosquito 46 stages relative to the controls, but over the entire experiment these observations did not 47 prove statistically significant. The number of offspring per adult C. decemmaculatus244 , while at 22 weeks, a 99% reduction was also observed in those with 7 fish/m2. The ditches with 1 fish/m2 45 had lower densities of immature mosquito 46 stages relative to the controls, but over the entire experiment these observations did not 47 prove statistically significant. The number of offspring per adult C. decemmaculatus2. The ditches with 1 fish/m2 45 had lower densities of immature mosquito 46 stages relative to the controls, but over the entire experiment these observations did not 47 prove statistically significant. The number of offspring per adult C. decemmaculatusC. decemmaculatus 48 female ranged from 4 ± 1.4 (mean ± SD) to 7.4 ± 0.9. Larval remains were detect.Fil: Tranchida, Maria Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Estudios Parasitológicos y de Vectores. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios Parasitológicos y de Vectores; ArgentinaFil: Pelizza, Sebastian Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Estudios Parasitológicos y de Vectores. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios Parasitológicos y de Vectores; ArgentinaFil: Bisaro, V.. Universidad Nacional de Rosario. Facultad de Ciencias Agrarias; ArgentinaFil: Beltrán, C.. Universidad Nacional de Rosario. Facultad de Ciencias Agrarias; ArgentinaFil: Garcia, Juan Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Estudios Parasitológicos y de Vectores. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios Parasitológicos y de Vectores; ArgentinaFil: Micieli, Maria Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Estudios Parasitológicos y de Vectores. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios Parasitológicos y de Vectores; Argentin

A Study of Freshwater Ichthyofaunal Diversity of Lakshmipuram Lake in Anakapalli District of Andhra Pradesh, India

The present study investigates the ichthyofaunal diversity of Lakshmipuram Lake in Anakapalli District of Andhra Pradesh state of India from January 2024 to December 2024, a vital freshwater body supporting ecological balance and local livelihoods. A total of 47 fish species were identified at different sites. Freshly collected fishes were carefully cleansed and photographed. They were preserved in 9-10% formalin solution. Fish species were identified using classical taxonomical observations. Among the identified 12 orders, the order Cypriniformes was dominant with 18 species which contributed to 37% followed by Siluriformes 10 (21%), Perciformes 3 (4%), Channiformes, Cichliformes, Anguilliformes each 3 (6%), Beloiniformes, Synbranchiformes each 2 (4%), while Cyprinodontiformes, Gobiiformies, Osteoglossiformes, Anabantiformes each 1 (2%). The population status of 11 species were abundant which contributed to 23% whereas 25 species were common contributing to 53%, 4 species were moderate by contributing to 8%, and the least percent of species i.e., 7 were represented as rare which contributed to only 14%. According to IUCN 2024, 36 species contributed around 77% are least concern (LC), 8 species contributed about 16% are near threatened (NT), about 2 species contributed to 4% are not evaluated (NE), and 1 species of 2% are data deficient (DD). As per the present study, the Lake is found good potential with variety of freshwater fish fauna

Papiliolebias hatinne, a new annual fish species (Cyprinodontiformes: Rivulidae) from Salta, Argentina

Papiliolebias hatinne sp. n. is described from a temporary pond, 5 km north of Embarcación, in the río Bermejo basin, Province of Salta, Argentina. Papiliolebias hatinne sp. n. is distinguished from the only congener, P bitteri, from the río Paraguay basin, by a combination of characters: 26-28 vertebrae, with 8-10 being precaudal: second proximal radial of anal fin located between vertebrae 9 and 10 or 10 and 11: 1-2 vomerine teeth: an elongation of jaw suspensorium: first epibranchial somewhat triangular: 7-8 pelvic-fin rays: 12- 13 pectoralfin rays: 20-23 caudal-fin rays: males with anal fin turquoise blue, dorsal and caudal fins bluish. pelvic fin blue, and humeral spot metallic bluish green; females without dark dots on flanks. The chromosome formula is 2n= 28. the FN= 36, integrated by two pairs of metacentric, two pairs of submetacentric and ten pairs of subtelocentric chromosomes.Facultad de Ciencias Naturales y Muse

Effect of salinity on locomotor performance and thermal extremes of metamorphic Andean Toads (Rhinella spinulosa) from Monte Desert, Argentina

Rhinella spinulosa is distributed from Peru to Argentina (from 1200 to 5000 m elevation), inhabiting arid mountain valleys of the Andes, characterized by salty soils. The variations in soil salinity, caused by high evapotranspiration of water, can create an osmotic constraint and high thermal oscillations for metamorphsed Andean toad (R. spinulosa), affecting their thermoregulation and extreme thermal tolerances. We investigated the changes in thermal tolerance parameters (critical thermal maximum and crystallization temperature) of a population of metamorphosed R. spinulosa from the Monte Desert of San Juan, Argentina, under different substrate salinity conditions. Our results suggest that the locomotor performance of metamorphs of R. spinulosa is affected by increasing salinity concentrations in the environment where they develop. On the other hand, the thermal extremes of metamorphs of R. spinulosa also showed changes associated with different salinity conditions. According to other studies on different organisms, the increase of the osmolarity of the internal medium may increase the thermal tolerance of this species. More studies are needed to understand the thermo-osmolar adjustments of the metamorphs of toads to environmental variability.Fil: Sanabria, Eduardo Alfredo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina. Universidad Nacional de San Juan. Facultad de Filosofía, Humanidades y Artes. Instituto de Ciencias Básicas; ArgentinaFil: Quiroga, Lorena Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina. Universidad Nacional de San Juan. Facultad de Filosofía, Humanidades y Artes. Instituto de Ciencias Básicas; ArgentinaFil: Vergara Alvarez, Silvia Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Departamento de Biología; ArgentinaFil: Banchig, Mariana. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Departamento de Biología; ArgentinaFil: Rodriguez Marun, Cesar Yamil. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Departamento de Biología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; ArgentinaFil: Ontivero, Roberto Emanuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis; Argentina. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Departamento de Biología; Argentin

Evaluation of ornamental freshwater fish trade in Aracaju, Sergipe

The purpose of this study was to conduct a survey of freshwater ornamental fish species sold in aquarium stores in Aracaju, Sergipe State, Brazil. Fishes sold in 15 establishments were identified and recorded monthly from May 2009 to April 2010. A total of 54,981 specimens of 143 species were registered, with a predominance of Neotropical fishes (n = 61). The most speciose families were Cichlidae (n = 48), Characidae (n = 18) and Cyprinidae (n = 18). Most of marketed species were: Xiphophorus maculatus, Poecilia latipinna and Carassius auratus. Fishes with the lowest trade prices represented those with greater commercialization. Five of the 15 stores visited amounted more than 60% of the individuals registered during the study, which was attributed mainly to the location in the central business area. Astyanax lacustris, Characidium fasciatum, Dormitator maculatus, Eigenmannia virescens, Geophagus brasiliensis, Hypostomus sp., Moekhausia costae and Moenkhausia sanctaefilomenae were also presented distribution in rivers of Sergipe state. The risk of bioinvasion in watercourses near to Aracaju cannot be dismissed due to the number of non-native species available in the market. The monitoring of the aquarium trade is necessary to control activity, as well as to contribute with the international convention of endangered species of wild fauna and flora that are traded (CITES) and in national programs of continental endangered species.O presente estudo realizou o levantamento das espécies de peixes ornamentais dulcícolas comercializados em lojas de aquarismo na cidade de Aracaju, estado de Sergipe, Brasil. Os peixes à venda em 15 estabelecimentos foram identificados e contabilizados mensalmente no período de maio de 2009 a abril de 2010. Foi registrado um total de 54.981 espécimes pertencentes a 143 espécies, com predomínio de representantes da região neotropical (n=61). As famílias com maior registro de espécies foram Cichlidae (n=48), Characidae (n=18) e Cyprinidae (n=18). Xiphophorus maculatus, Poecilia latipinna e Carassius auratus foram as três espécies mais comercializadas. As espécies com menores preços corresponderam àquelas com maior comercialização. Cinco dentre15 lojas visitadas somaram mais de 60% dos espécimes registrados durante o estudo, fato atribuído principalmente à maior estrutura do estabelecimento e à localização em bairro comercial. Astyanax lacustris, Characidium fasciatum, Dormitator maculatus, Eigenmannia virescens, Geophagus brasiliensis, Hypostomus sp., Moekhausia costae e Moenkhausia sanctaefilomenae foram as espécies que também apresentam distribuição em rios do estado de Sergipe. Não é descartado o risco de bioinvasão nas principais cursos d’água próximos de Aracaju em função do número de espécies não nativas comercializadas. O monitoramento da comercialização de peixes ornamentais faz-se necessário para controle da atividade, bem como contribuir com o acordo internacional de espécies ameaçadas que são comercializadas (CITES) e nos programas nacionais de espécies continentais ameaçadas

INVENTÁRIO DA FAUNA DE PEIXES DA FLORESTA NACIONAL DE IBIRAMA (SC) COMO BASE DE ESTUDOS ICTIOLÓGICOS DO VALE DO ITAJAÍ

A Mata Atlântica é um bioma que abriga uma grande biodiversidade e um alto grau de endemismo, mas sofre intensa pressão antrópica, especialmente com a degradação de rios causada pela perda de vegetação ripária, poluição das águas, barramentos e introdução de espécies exóticas. Neste contexto, o desenvolvimento de ferramentas para conhecer a identidade e a capacidade adaptativa de animais, como peixes, permite desenvolver estratégias de conservação da biota aquática e promover intervenções ambientais mais adequadas. Neste estudo objetivamos produzir um inventário da fauna de peixes para a Bacia Hidrográfica do Rio Itajaí, por meio de uma revisão sistematizada de documentos científicos e pareceres técnicos, que pode ser utilizado para embasar trabalhos de preservação e conservação dos riachos de cabeceira na área de estudo. Identificamos apenas três publicações científicas e quatro estudos de impactos ambientais relacionados com a bacia do Rio Itajaí. Nessa literatura, foram reportadas a ocorrência de 77 espécies de peixes, distribuídas em 7 ordens e 19 famílias. Siluriformes e Characiformes foram as ordens mais representativas (47% e 26%, respectivamente). A alta diversidade de Siluriformes pode ser explicada pela adaptação de peixes dessa ordem a ambientes de águas rápidas, os quais geralmente possuem o corpo achatado dorso-ventralmente e uma boca em forma de ventosa que pode ser utilizada para se aderir ao substrato, evitando o deslocamento pela correnteza. Do total de espécies de peixes reportadas para a região, 10 são não-nativas (13%), sendo quatro Cypriniformes, três Perciformes, duas Siluriformes e uma Cyprinodontiforme. A ocorrência de espécies de peixes com potencial invasor, tais como tilápia e carpa, na bacia do Rio Itajaí é extremamente preocupante pois elas têm o potencial de causar consideráveis mudanças na composição da comunidade nativa, alterações no ambiente e provocar a extinção de diversas espécies de vertebrados e de invertebrados. Ficou claro que pouco se sabe sobre a ictiofauna do Vale do Itajaí e que nossos resultados são importantes para ações de avaliação e conservação desta área, pois o levantamento preciso da ictiofauna é um pré-requisito para a preservação das espécies de peixes nativas e a manutenção dos estoques pesqueiros da região

Notas experimentales sobre <i>Gambusia cf. affinis</i> (Osteichthyes: poeciliidae) en Argentina

G. affinis is a native poecilid of North America. It was introduced in Argentina in 1945, since then G. affinis has established as stable populations in several provinces like Cordoba and Buenos Aires up to 35º S approximately. On this work, three different kinds of experiences have been made to obtain some ecophysiological features of this exotic fish. The results were compared with those of Cnesterodon decemmaculatus, a native poecilid widely used in bioassays in Argentina. Some comments were made upon the morphological and pigmentation aspects of both species. The incipient lethal level of pH (96 h) was estimated at 10.3. The average swimming capacity using the Fatigue Time technique with a constant velocity of 6.8 cm.s-1 was 46.6 min and the lethal temperature obtained by means of the Critical Maximum technique was 41.21 ºC. All the analyzed parameters were larger than those noted for C. decemmaculatus. Both species showed a significant loss in their pigmentation when they were exposed to light or high temperatures. However, there are not any references of presence for G. cf. affinis in Patagonia nor in Pampasian lagunas, it has shown to be more eurithopic than C. decemmaculatus suggesting that it fulfills all the requirements to be found in these regions together with other Cyprinodontiforms.Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) - Instituto de Limnología "Dr. Raul A. Ringuelet" (ILPLA