Parasitologicalassessment and host-parasite relationship in farmed Cachara catfish fingerlings (Pseudoplatystoma reticulatum Eigenmann & Eigenmann 1889), Mato Grosso do Sul, Brazil.

Farmed fingerlings of South American catfish are frequently exposed to several parasites, but little information is available for implementing health programs for control and prevention of parasitic diseases in the hatcheries. This study evaluated the parasitic fauna of cachara catfish fingerlings (Pseudoplatystoma reticulatum Eingenmann & Eigenmann, 1889) and the hostparasite relationship during the early stages of rearing. A total of 302 cachara fingerlings were used for parasitic diagnosis and histopathological analysis. Ichthyophthirius multifiliis and Trichodina heterodentata were diagnosed as the most prevalent parasites, followed by Cryptobia sp., Henneguya sp., Monogenea and Nematoda. There was a positive correlation between the size of the fish and the mean intensity of parasitism by I. multifiliis. Proliferation of mucus cells, club cells, multifocal area of degeneration, epithelial necrosis on the body surface, skin ulceration, fusion of secondary gill lamellae and inflammatory infiltration were observed in I. multifiliisinfected fish. Ciliated protozoans were the main etiological agents diagnosed, and the cachara (P. reticulatum) is a new host for T. heterodentata. In addition, ichthyophthiriasis induced severe tissue damage thus making the fingerlings susceptible to opportunistic infections.Los alevines de bagres del Sur de América en cautiverio están frecuentemente expuestos a muchos parásitos, pero poca información es evaluada para implementar programa de salud para control y prevención de enfermedades en criaderos. Este estudio evaluó la fauna de parásitos de alevines de cachara (Pseudoplatystoma reticulatum Eingenmann & Eingenmann, 1889) y la relación huésped-parásito durante las fases iníciales de cultivo. Un total de 302 alevines fueran sometidos a diagnóstico y análisis histopatológicos. Ichthyophthirius multifiliis y Trichodina heterodentata fueran diagnosticados como los parásitos mas prevalentes, seguidos de Cryptobia sp., Henneguya sp., Monogenea y Nematoda. Ha sido observada una correlación positiva entre la longitud de los peces y la intensidad promedio de I. multifiliis. Proliferación de células de moco, células club, áreas multifocales de degeneración, necrosis epitelial en la superficie del cuerpo, ulceración de piel, fusión de laminillas branquiales secundarias e infiltración inflamatoria fueron observados en peces infectados por I. multifiliis. Los protozoarios ciliados fueran los agentes etiológicos más importantes y el cachara (P. reticulatum) es un nuevo huésped para T. heterodentata. En adición, la ictioftiriasis indujo un daño severo favoreciendo las infecciones oportunistas en los alevines

Infestação por ictio em surubim híbrido durante a fase inicial de criação.

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Prevalência parasitária de Piaractus mesopotamicus Holmberg, 1887 produzidos na região da Grande Dourados, MS.

A intensificação dos sistemas de produção com intuito de aumentar a produtividade pode levar a uma maior prevalência parasitária e consequente perdas econômicas decorrentes destas parasitoses. Parasitas é uma grande preocupação nas pisciculturas, pois resultam em perdas diretas e indiretas. O controle eficaz da doença depende de manejo sanitário integrado, que considera o hospedeiro, o meio ambiente, os parasitas e as práticas de criação. Objetivou-se estudar a prevalência parasitária de P. mesopotamicus de pisciculturas e sua relação com o ambiente e o manejo sanitário

Biologia e estratégias na sanidade de alevinos de bagres carnívoros.

Aspectos Biológicos; Reprodução e desenvolvimento embrionário; Larvicultura e alimentação inicial; Aspectos Sanitários; Doenças parasitárias; Ictiofitiríase - doença-dos-pontos-brancos; Biologia do parasito; Ciclo da vida; Transmissão; Sinais clínicos; Tricodiníase; Biologia do parasito; Ciclo da vida; Transmissão Sinais clínicos; Epistilíase; Biologia do parasito; Ciclo da vida; Transmissão; Doença-da-ferida-vermelha (Red-sore-disease); Mixosporidíase; Biologia do parasito; Ciclo da vida; Transmissão; Doenças bacterianas; Septicemia hemorrágica bacteriana; Meningoencefalite bacteriana; Columnariose; Manejo Profiláticobitstream/item/74183/1/DOC2012115.pd

Parasitic infestations in hybrid surubim catfish fry (Pseudoplatystoma reticulatum x P. corruscans).

Made available in DSpace on 2012-11-17T00:04:34Z (GMT). No. of bitstreams: 1 MARCIA.pdf: 1332233 bytes, checksum: 3e931f37ddef5c4f9453bf436c148e7e (MD5) Previous issue date: 2012-11-16201

Vertical migration of Haemonchus contortus third stage larvae on Brachiaria decumbens grass

The present study aimed at evaluating the vertical migration of Haemonchus contortus third stage larvae (1-3) on Brachiaria decumbens grass, as well as at verifying whether larval numbers on pasture varies over the day due to climatic conditions. Feces containing H. contortus L3 were deposited on the soil in the middle of herbage which was initially 30 cm high. Seven days later, samples of different herbage strata (0-10, 10-20 and >20 cm), remaining feces and a layer of approximately 1 cm soil were collected. Tests were carried out in four periods: September 2006, December 2006, March 2007, and June 2007. Samples were collected at sunrise, mid-day, sunset, and mid-night. The humidity and temperature conditions observed in different months influenced larval migration from the feces to the grass. In September, December and March, it rained after fecal deposition on pasture, which favored migration of larvae from the feces to the herbage. Conversely, in June 2007, when there was no rainfall after fecal deposition and temperatures were lower, L3 were mainly recovered from feces. As regards the vertical migration of larvae, the numbers of H. contortus L3 in the forage strata remained relatively constant over the day. This indicates there is not a determined period in which sheep on pasture are at higher risk of infection. Finally, in all collection periods a considerable amount of third stage larvae was observed on the herbage top, which is the first plant part consumed by sheep. (C) 2008 Elsevier B.V. All rights reserved