EFEITOS DA APLICAÇÃO DE TRICHLORFON UTILIZADO NO TRATAMENTO DE PARASITOSES SOBRE MÉTRICAS BIOLÓGICAS DE Ctenopharingodon Idella (Valenciennes, 1844)

Este estudo avaliou, em condições laboratoriais, o efeito do uso de Trichlorfon para controle de parasitas – em níveis recomendados na literatura – sobre o crescimento, danos histológicos e possível bioacomulação em tecidos de carpa-carpim após tratamento. Dois ensaios com o mesmo desenho experimental foram conduzidos com 10 espécimes de C. idella em cada aquário, sob condições abióticas controladas. Trichlorfon 500 (ingrediente ativo de Triclorfon) foi adicionado à água do tanque a uma concentração de 0,25 mg/L, uma vez por semana durante cinco semanas consecutivas. Durante esse período, tomamos medidas biométricas e realizamos análises histológicas de brânquias e cromatografia da musculatura dos peixes. Os resultados indicam que Triclorfon promoveu alterações fisiológicas nos peixes analisados. No grupo de tratamento, houve uma inibição do apetite e uma diminuição no crescimento. Não houve diferenças histopatológicas significativas entre as amostras dos grupos controle e de tratamento. O cromatograma da amostra de músculo de peixe, coletado cinco dias após a última aplicação de Triclorfon, não indica evidência de bioacumulação para Triclorfon ou seus resíduos metabólicos. Assim, pode-se dizer preliminarmente que esse tipo de tratamento teve um baixo efeito sobre as estruturas morfológicas dos órgãos vitais e não foi acumulado no músculo do peixe. No entanto, o tratamento inibiu diretamente o crescimento, um dos fatores mais importantes no contexto da piscicultur

As pesquisas desenvolvidas pelo GIA - Grupo Integrado de Agricultura e Estudos Ambientais

Genero: EntrevistaRealizaçăo: UFPR TVEntrevistado: Prof. Walter BoegerEntrevistadora: Lauren Trilh

As pesquisas desenvolvidas pelo GIA - Grupo Integrado de Agricultura e Estudos Ambientais

Genero: EntrevistaRealizaçăo: UFPR TVEntrevistado: Prof. Walter BoegerEntrevistadora: Lauren Trilh

O GIA - Grupo Integrado de Aquicultura e Estudos Ambientais

Gęnero: EntrevistaRealizaçăo: UFPR TVEntrevistado: Walter Boeger, professor do Departamento de Zoologia da Universidade Federal do Parana e integra o GIA - Grupo Integrado de Aquicultura e Estudos AmbientaisEntrevistadora: Patricia Moskwi

Cestodes larvaires (Platyhelminthes, Cestoda) de poisson Sciaenidae de la côte sud du Brésil.

Submitted by Vanessa Brum da Silva ([email protected]) on 2011-05-01T23:04:24Z No. of bitstreams: 1 Larval tapeworms (Platyhelminthes, Cestoda).pdf: 1251478 bytes, checksum: eb696c9b3faf760bca0b73f1672c87ee (MD5)Approved for entry into archive by Barbara Milbrath([email protected]) on 2011-05-03T11:12:25Z (GMT) No. of bitstreams: 1 Larval tapeworms (Platyhelminthes, Cestoda).pdf: 1251478 bytes, checksum: eb696c9b3faf760bca0b73f1672c87ee (MD5)Made available in DSpace on 2011-05-03T11:12:25Z (GMT). No. of bitstreams: 1 Larval tapeworms (Platyhelminthes, Cestoda).pdf: 1251478 bytes, checksum: eb696c9b3faf760bca0b73f1672c87ee (MD5) Previous issue date: 2005Cestode larvae were collected from 10 species of sciaenid fishes from the coast of Rio Grande do Sul, Brazil. Eleven species of Trypanorhyncha and two unindentified larvae are reported: Pterobothrium heteracanthum, P. crassicolle, Callitetrarhynchus gracilis, C. speciosus, Dasyrhynchus pacificus, Heteronybelinia nipponica, H. annakohnae n. sp., H. estigmena, Nybelinia bisulcata, Progrillotia dollfusi, Dollfusiella sp., an unidentified species of plerocercoid larva, and an unidentified species of procercoid larva. Heteronybelinia annakohnae n. sp. is described based on specimens from four host species. It is characterized by a long pars postbulbosa and by bothridial margins covered with spines and that overlap the bulbs. Progrillotia dollfusi is redescribed based on paratypes and specimens collected in the present study. The basal tentacular armature, the presence of a prebulbar organ and of a pars postbulbosa, the attachment of the retractor muscle of the tentacle in the first third of the bulb, and the pres- ence of gland cells in the interior of the bulbs, are reported in this species for the first time. These characteristics support and amend the diagnosis of Progrillotia. A procercoid larva is described for the first time from fish in Brazil. Measurements, descriptions, and drawings of the specimens of those species which are insufficiently or incompletely known are presented.Des larves de cestodes ont été collectées chez 10 espèces de poissons sciaenidés provenant de la côte de Rio Grande do Sul, Brésil. Onze espèces de trypano-rhynques et deux larves non identifiées sont signalées : Pterobothrium heteracan-thum, P.crassicolle, Callitetrarhynchus gracilis, C. speciosus, Dasyrhynchus pacificus, Heteronybelinia nipponica, H. annakohnae n. sp., H. estigmena, Nybelinia bisulcata, Progrillotia dollfusi, Dollfusiella sp., une espèce non identifiée de larve plerocer-coïde ainsi qu’une espèce indéterminée de larve procercoïde. Heteronybelinia annakohnae n. sp. est décrit sur la base de spécimens collectés chez quatre espèces d’hôtes. Ce cestode est caractérisé par une longue pars postbulbosa et par les marges des bothridies qui sont couvertes d’épines et qui chevauchent le bulbe. Progrillotia dollfusi est redécrit sur la base des paratypes et des spécimens collectés lors de cette étude. L’armature tentaculaire de base, la présence d’un organe pré-bulbaire et de la pars postbulbosa, l’attachement du muscle rétracteur du tenta-cule au niveau du premier tiers du bulbe et la présence de glandes cellulaires à l’intérieur des bulbes sont observées pour la première fois chez cette espèce. Ces caractéristiques soutiennent et modifient la diagnose de Progrillotia. Une larve procercoïde est décrite pour la première fois chez un poisson brésilien. Les mesures, descriptions et dessins des spécimens de cette espèce, qui sont insuffi-samment ou incomplètement connues, sont présentés dans ce travail

The effect of temperature and body size on filtration rates of Limnoperna fortunei (Bivalvia, Mytilidae) under laboratory conditions

The golden mussel (Limnoperna fortunei, Mollusca: Bivalvia) is an invasive species that has been causing considerable environmental and economic problems in South America. In the present study, filtration rates of L. fortunei were determined in the laboratory under different temperatures (10, 15, 20, 25, 28, and 30 ºC) and two types of food (Algamac-2000® and the chlorophycean alga Scenedesmus sp.). There was a statistically significant relationship between time and filtration rates in the experiment using Scenedesmus sp., regardless of temperature. However, this pattern was absent in the experiment using Algamac, suggesting that the relationship between filtration rates and temperature might depend on the size of the filtered particles. In addition, there was no correlation between filtration rates and either shell size or condition index (the relationship between the weight and the length of a mussel). The filtration rate measured in the present study (724.94 ml/h) was one of the highest rates recorded among invasive bivalves to date. Given that the colonies of the golden mussel could reach hundreds of thousands of individuals per square meter, such filtration levels could severely impact the freshwater environments in its introduced range

Effects of shrimp cage farming on sediment nutrients in a subtropical estuary

The objective of this study was to evaluate the effects of shrimp (Litopennaeus vannamei) cage farming on sediment nutrients concentration. The farm were located in a subtropical estuary (Guaratuba Bay) in the south of Brazil and  held 300 cages (size: 3.6m x 3.6m x 2m) made of PVC distributed over an area of approximately 4200m². Shrimps were fed with two types of commercial feeds, one developed specifically for shrimp and other for fish. Five sampling points were defined, one was located at the center of the farm area, one was set 1000m away from the farm, in an area with similar hydrodynamics conditions, and the others were located 200m away from the culture in west, northeast and southwest directions. During one year, monthly sediment sampling was performed at each station. Carbon (C), phosphorus (P), calcium (Ca²+), and potassium (K+) concentrations were determined. The results consistently indicate that in the studied shrimp farm the nutrients concentration increased significantly below the cultivation cages. We also obtained an indication that under the studied conditions the raise in the levels of nutrients can reach distances in the range of 200m

Shared Physiological Traits of Exophiala Species in Cold-Blooded Vertebrates, as Opportunistic Black Yeasts

Several species of the genus Exophiala are found as opportunistic pathogens on humans, while others cause infections in cold-blooded waterborne vertebrates. Opportunism of these fungi thus is likely to be multifactorial. Ecological traits [thermotolerance and pH tolerance, laccase activity, assimilation of mineral oil, and decolorization of Remazol Brilliant Blue R (RBBR)] were studied in a set of 40 strains of mesophilic Exophiala species focused on the salmonis-clade mainly containing waterborne species. Thermophilic species and waterborne species outside the salmonis-clade were included for comparison. Strains were able to tolerate a wide range of pHs, although optimal growth was observed between pH 4.0 and 5.5. All strains tested were laccase positive. Strains were able to grow in the presence of the compounds (mineral oil and RBBR) with some differences in assimilation patterns between strains tested and also were capable of degrading the main chromophore of RBBR. The study revealed that distantly related mesophilic species behave similarly, and no particular trend in evolutionary adaptation was observed

Duration of the pre-settlement period of the mangrove crab Ucides cordatus (decapoda:Ocypodidae) under laboratory conditions

The goal of the present study was to determine the most appropriate time to release the immatures of Ucides cordatus (Linnaeus) produced in the laboratory into the natural environments. Specifically, the time when the megalopae sought the mangrove sediment to excavate the burrows was determined, as well as the time necessary for their metamorphosis into the first juvenile stage. Results indicated that the megalopae of U. cordatus reared in the laboratory took three to ten days (median = 6) after their molt to excavated burrows in the sediment. The average time for the megalopae to molt into juveniles was 12.6 days (SD = 2.3).<br>O estágio de desenvolvimento em que se encontram as formas jovens de caranguejo produzidas em laboratório, no momento da sua liberação para o ambiente, é um fator chave para o sucesso dos trabalhos de repovoamento. O presente trabalho teve como objetivo determinar a idade mais adequada das formas jovens de U. cordatus, produzidas em laboratório, para sua liberação no ambiente natural. Especificamente, o momento em que as megalopas procuram o sedimento de mangue para escavar tocas foi determinado, assim como o tempo que demoram até realizarem a metamorfose para o primeiro estágio juvenil. O experimento indicou que as megalopas de U. cordatus produzidas em laboratório levam de 3 a 10 dias (mediana = 6) após a metamorfose até escavarem tocas no sedimento. O tempo médio que as megalopas levaram até realizar a metamorfose para o primeiro estágio juvenil foi de 12,6 dias (desvio padrão = 2,33)