Sample records for dinoflagellida

  1. Piscinoodinium pillulare (Schäperclaus, 1954 Lom, 1981 (Dinoflagellida infection in cultivated freshwater fish from the Northeast region of São Paulo State, Brazil: parasitological and pathological aspects


    Full Text Available The Aquaculture Center of Unesp, Jaboticabal, SP, Brazil, received fishes for diagnosis from fish farmers reporting fish crowding at pond edges and in water inlets. Fifty-three out of 194 cases showed round to oval, immobile whitish structures, measuring up to 162 mm diameter, identified as the dinoflagellate Piscinoodinium pillulare. In 34 diagnosed cases the parasites were present in the gills, in 2 on body surface, and 9 in both. Thirty-one out of 53 were tambacu hybrids hosts; 7, Piaractus mesopotamicus; 6, Colossoma macropomum; 5, Leporinus macrocephalus; 3, Oreochromis niloticus; and 1, Prochilodus lineatus. Fish showed increased mucous production on body surface and gills, while ecchymosis in the caudal peduncle and operculum was present. The gills also showed paleness, congestion, and petechiae. Histopathology presented a great number of trophonts situated between secondary lamellae, fixed to or detached from the epithelium. Primary lamellae presented interstitial hemorrhages, severe hyperplasia of the epithelium, goblet cells, and mononuclear infiltrates. The present work is the first report of P. pillulare in Brazil and emphasizes the importance of this dinoflagellate which caused significant economic losses from 1995 through 1997.

  2. Acute Toxicity of Formalin to the Red-tide Dinoflagellate Prorocentrum minimum Schiller (Protozoa, Mastigophora)

    XU Henglong; SONG Weibo; ZHU Mingzhuang; QIU Yantao; MA Honggang


    The acute toxic levels of formalin to a marine red-tide dinoflagellate Prorocentrum minimum Schiller(Mastigophora,Dinoflagellida) were determined by linear regression analysis. The data obtained revealed that there is a close regression relationship between logarithmic concentrations of formalin and mortality probit scales of the organism whenexposure times are1, 2, 6, 12, 24 h. The median lethal concentrations (LC50 values) obtained from correlation analysis for these exposure times (with 95% confidence intervals), were 11.83, 6.76, 4.37, 4.27 and 3.98mgL-1, respectively. A toxicity curve was obtained to connect the exposure time and LC50 value from the correlation between them. The results indicated that P. minimum could be killed or fixed by formalin in the concentration range of 4-12 mgL-1 within 1-24 h.

  3. Fauna parasitária de tambaqui Colossoma macropomum (Characidae cultivado em tanque-rede no estado do Amapá, Amazônia oriental Parasitic fauna of tambaqui Colossoma macropomum(Characidae farmed in cages in the State of Amapá, eastern Amazon

    Evandro Freitas Santos


    Full Text Available O objetivo principal deste trabalho foi estudar a parasitofauna e a relação hospedeiro- parasito em tambaqui Colossoma macropomum cultivados em tanques-rede no Rio Matapi, município de Santana, estado do Amapá, região da Amazônia oriental, Brasil. Foram examinados 60 tambaquis, dos quais 96,7% estavam parasitados por protozoários Ichthyophthirius multifiliis (Ciliophora e Piscinoodinium pillulare (Dinoflagellida, monogenoideas Mymarotheciun boegeri e Anacanthorus spathulatus (Dactylogyridae e sanguessugas Glossiiphonidae gen. sp. (Hirudinea. Os maiores níveis de parasitismo foram causados por protozoários I. multifiliis e P. pillulare e os menores por sanguessugas Glossiiphonidae gen. sp. Porém, os índices de infestação não tiveram efeitos na saúde dos peixes hospedeiros, uma vez que o fator de condição relativo (Kn não foi estatisticamente (pThe purpose of this paper was to evaluate the parasitic fauna and the host-parasite relationship in Colossoma macropomum farmed in cages of Matapi River, municipally of Santana, State of Amapá, in eastern Amazon, Brazil. Of 60 specimens of tambaqui examined, 96.7% were parasitized by protozoans Ichthyophthirius multifiliis (Ciliophora and Piscinoodinium pillulare (Dinoflagellida, monogenoideans Mymarotheciun boegeri and Anacanthorus spathulatus (Dactylogyridae, and leeches Glossiphoniidae gen. sp. (Hirudinea. The higher infestation levels were caused by protozoans I. multifiliis and P. pillulare, while the lower infestation levels were caused by leeches. No effects of parasitic infestation rates on fish health were observed. The relative condition factor (Kn was not correlated with the intensity of parasites found. This was the first record of I. multifiliis and P. pillulare in C. macropomum farmed in cages in the Brazilian Amazon.

  4. Parasitic fauna in hybrid tambacu from fish farms

    Ronilson Macedo Silva


    Full Text Available The objective of this work was to evaluate the parasitic fauna of hybrid tambacu (Colossoma macropomum x Piaractus mesopotamicus from fish farms and the host-parasite relationship. A hundred and fourteen fish were collected from four fish farms in Macapá, in the state of Amapá, Brazil, 80.7% of which were infected by: Ichthyophthirius multifiliis (Ciliophora; Piscinoodinium pillulare (Dinoflagellida; Anacanthorus spatulatus, Notozothecium janauachensis, and Mymarothecium viatorum (Monogenoidea; Neoechinorhynchus buttnerae (Acanthocephala; Cucullanus colossomi (Nematoda; Perulernaea gamitanae (Lernaeidae; and Proteocephalidae larvae (Cestoda. A total of 8,136,252 parasites were collected from the examined fish. This is the first record of N. buttnerae, C. colossomi, N. janauachensis, M. viatorum, and Proteocephalidae for hybrid tambacu in Brazil. Ichthyophthirius multifiliis was the most prevalent parasite, whereas endohelminths were the less. A positive correlation was observed between number of I. multifiliis and total length and weight of fish, as well as between number of P. gamitanae and total length. The infection by I. multifiliis had association with the parasitism by Monogenoidea. Low water quality contributes to high parasitism of hybrid tambacu by ectoparasites, which, however, does not influence the relative condition factor of fish.

  5. Parasitic fauna of eight species of ornamental freshwater fish species from the middle Negro River in the Brazilian Amazon Region Fauna parasitária de oito espécies de peixes ornamentais de água doce do médio Rio Negro na Amazônia brasileira

    Marcos Tavares-Dias


    Full Text Available Twenty-seven specimens of cardinal tetra Paracheirodon axelrodi, 33 rosy tetra Hyphessobrycon copelandi (Characidae, 28 marbled hatchetfish Carnegiella strigata, 26 blackwing hatchetfish Carnegiella martae (Gasteropelecidae, 27 bodó Ancistrus hoplogenys (Loricariidae, 31 brown pencilfish Nannostomus eques, 38 oneline pencilfish Nannostomus unifasciatus (Lebiasinidae and 13 angelfish Pterophyllum scalare (Cichlidae were collected from the middle Negro River, State of Amazonas, Brazil, for parasitological studies. Out of the total of 223 fish examined, 143 (64.1% were parasitized by at least one parasite species. The highest prevalence rate was for Monogenea (36.7%, followed by Ichthyophthirius multifiliis (Ciliophora (20.6%, Trichodina spp. (Ciliophora (4.0%, Piscinoodinium pillulare (Dinoflagellida (1.3%, Tetrahymena sp. (Ciliophora (0.89%, and Procamallanus sp. (Nematoda (0.4%. All eight fish species had Monogenea (Gyrodactylidae and Dactylogyridae in the gills, but the highest prevalence occurred in P. scalare and the lowest in P. axelrodi and C. strigata. However, the highest mean intensity of Monogenea was found in P. scalare and A. hoplogenys. The protozoan I. multifiliis occurred in the six ornamental fish species examined, but C. strigata and C. martae had higher prevalence and mean intensity. Trichodina spp. were found only in the gills of C. strigata, C. martae and N. eques, and with higher mean intensity in C. strigata. On the other hand, the protozoan P. pilullare was found only in the gills of C. martae. This is the first report of Tetrahymena sp. in Brazil, and it occurred in the gills of C. strigata.Para estudos parasitológicos, 27 espécimes de cardinal Paracheirodon axelrodi, 33 rosa-céu Hyphessobrycon copelandi (Characidae, 28 peixes borboleta Carnegiella strigata e 26 Carnegiella martae (Gasteropelecidae, 27 bodó ou cascudo Ancistrus hoplogenys (Loricariidae, 31 peixes-lápis Nannostomus eques e 38 Nannostomus unifasciatus

  6. 甘肃尕海湿地冬季肉鞭虫物种多样性研究%Studies on Species Diversity of Amoebae and Flagellates in Gahai Wetland of Gansu Province in Winter

    刘汉成; 王珊珊; 马雄; 马海财; 巩红冬; 宁应之


    Species diversity of amoebae and flagellates in Cahai wetland was studied with "non-flooded pelri dish method" and in vivo observation from October 2011 to January 2012. In addition to 6 unnamed species, total 81 species, belonging to 2 subphylums,6 classes, 13orders,26 families and 39 genera,were identified. Euglenida and Kineto-plastida are the dominant groups, occupied 38. 18% and 25.45% respectively in Mastigophora. And amoebida is the dominant group (62.5% ) in Sarcodina. The results showed that Dinoflagellida was rare community in this area with only one species, one genus found. Results of the studies indicated that there is abundant species in Gahai wetland, and the species distribution has an obvious negative relationship to the temperature of various sampling sites,but no significant relationship with the altitude or humidity of the sampling site.%自2011年10月至2012年1月,用“非淹没培养皿法”和活体现察法对冬季尕海湿地内肉鞭虫物种多样性和群落特征进行了研究.共鉴定到肉鞭类原生动物87种,隶属于2亚门6纲13目26科39属,其中包括6个未定名种.在鞭毛亚门中眼虫目和动基体目为优势类群,物种数分别占该亚门物种总数的38.18%和25.45%.肉足亚门中变形目为优势类群,物种数占该亚门物种总数的62.5%.腰鞭目物种为该地区罕见类群,只有1属1种.研究结果表明,尕海湿地内肉鞭虫物种丰富,物种分布与海拔和样点湿度无明显关系,而与样点内生境的温度呈显著负相关性.