|
|
|
| Registros recuperados: 501 | |
|
|
| Pavanelli,Gilberto C; Machado,Marion H; Takemoto,Ricardo M; dos Santos,Leonilda C. |
| In the present paper the authors describe and illustrate a new species of proteocephalidean cestode, Monticellia belavistensis, sp.n., parasite of a freshwater siluriform fish (thorny catfish). Pterodoras granulosus (Valenciennes, 1833), from the Itaipu Reservoir and Paraná River, in the region of Porto Rico. This is the first reference of a proteocephalid in this host. The values of prevalence and mean intensity of infection are given and the life cycle is discussed. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Proteocephalidea; Monticellia belavistensis; New species; Pterodoras granulosus; Paraná River; Ecology; Fish. |
| Ano: 1994 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751994000400001 |
| |
|
|
| Kavamoto,Emico Tahira; Narahara,Massuka Yamane; Andrade-Talmelli,Elaine Fender de. |
| This Study Concerns the morphological changes of the testes of "curimbatá", Prochilodus scrofa (Steindachner, 1881) at the beginning of sperm production, before and after the hormonal injections. We examined 25 three year old males that were reared in tanks at the Experimental Fish and Frog Culturing Station of Pindamonhangaba of the Fisheries Institute of São Paulo. The testes were sampled at the start of sperm production, after the first hormone injection (5 IU/g for weight of hCG), and 14 days before and after a second injection. Testicle fragments of these specimens were fixed and embedded in historesin. At the beginning of sperm production, the milky-white gonad showed consistem superficial vascularization, exceeding thick sperm under light pressure.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Prochilodus scrofa; Fish; Testes; Morphology; Hormonal stimulation. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751998000100008 |
| |
|
| |
|
|
| Rodrigues,Edson de Lara; Fanta,Edith. |
| Among the new substances that were synthesised by the chemical industiy during the last decades, with the aim to improve human prosperity, some cause negative effects on non target organisms like fish. Among the pesticides, the organophosphates (OP) are widely used in cattle management, agriculture and aquaculture activities. Brachydanio rerio Hamilton-Buchman, 1822 is used world-wide in fish-tests for the establishment of the lethal levels of pesticides. Nevertheless, these fish show morphological changes in their hepatocytes when exposed experimentally for 24 hours to the sublethal dose of 0.025 µl/l of the OP Dimethoate 500, in acute tests. Right hours after exposure, a high density of cells with cytoplasmic granulation is seen as well as focal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dimethoate; Histopathology; Fish; Liver; Organophosphates; Sublethal contamination. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751998000200014 |
| |
|
| |
|
|
| Martins,Maurício Laterça; Castajjnolli,Newton; Zuim,Sônia Maria Fontes; Urbinati,Elisabeth Criscuolo. |
| Haematological changes in ascorbic acid deficient fishes, observed by some authors, awoked the interest in the haematological response of pacu, Piaractus mesopotamicus. The present work studied the influence of different levels of ascorbic acid (vitamin C) in the ration on the haematological parameters of pacu. Fishes at the beginning of the experiment, presented average body weight 8.64±1.62g and 6.15±0.33cm standard length, were fed with diets containing 0. 50, 100 and 200mg ascorbic acid/kg dry ration. The present work was developed for a period of 24 weeks at the Fish Nutrition Laboratory of Aquaculture Center of Universidade Estadual Paulista (Unesp), Jaboticabal (São Paulo). The fishes were distributed by the completely randomized design in 20... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Osteichthyes; Characidae; Piaractus mesopotamicus; Haematology; Vitamin C; Fish. |
| Ano: 1995 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751995000300016 |
| |
|
|
| Sousa,José Américo de; Eiras,Jorge da Costa; Ranzani-Paiva,Maria José T; Alexandrino,Agar Costa. |
| Bacterial strains isolated from the kidney and liver of grey mullets, Mugil platanus Giinther, 1880, captured in Cananéia, São Paulo State, Brazil, in October 1996, belong to the genera Micrococcus, Pseudomonas, Flavobacterium, Aeromonas and Vibrio. The resistance/susceptibility patterns of the isolated micro-organisms to nine antimicrobial substances were determined, the more resistant bacteria had been Pseudomonas, Flavobacterium and Micrococcus. To the best of the authors knowledge this is the first bacteriological study done on Mugil platanus in Brazil. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mugil platanus; Grey mullets; Fish; Bacteriology; Brazil. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000400015 |
| |
|
| |
|
|
| Bastos,Vera Lucia F. Cunha; Folly,Evelize; Rossini,Ana; Ceccarelli,Paulo S.; Senhorini,José A.; Bastos,Jayme Cunha. |
| Enzymatic production of p-nitrophenol in liver of Piaractus mesopotamicus Holmberg, 1887 was consistently assayed at pH 8.5 using 7.5 mM paraoxon as substrate. This pacu liver paraoxonase activity was activated by NaCl. Apparent values of K M were 2.42 x 10-3 M in the presence of 0.5 M NaCl and 8.99 x 10-3 M without NaCl. Apparent maximum velocity values calculated in the absence and presence of 0.5 M NaCl were 1.09 x 10-3 µmoles/min/mg of proteins and 1.29 x 100-3 µmoles/min/mg of proteins, respectively. These Vmax values are fifty-fold the value described for trout (Salmo trutta Linnaeus, 1758) liver paraoxonase. Paraoxonase activity of pacu liver homogenates was recovered as much in cytosolic as in particulate cellular subtractions, but the particulate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Detoxication; Esterase; Fish; Organophosphate. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751998000300012 |
| |
|
| |
|
| |
|
|
| Fanta,Edith. |
| The behavioural patterns and their cireadian rhythms may be adaptive to the peculiar environmental conditions of subtropical brackish waters where Ba-thygobius soporator Valenciennes, 1837 live. Adult fish were caught at the southern Brazilian coast from mangrove rivers and rocky shores in a bay, where temperature and water salinity vary during the day and through the year. Observation on the behaviour of the animals was undertaken in salinity 8.5ppt, 17.0ppt, 25.5ppt and 34.0ppt, each one in temperatures of 18ºC and 28ºC. Temperature and salinity affect the frequency and intensity of some of the behavioural events, more than its pattern or rhythm. Swimming is rare, decreasing along the day and with temperature increase, being even lower at low salinity;... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bathygobius soporator; Fish; Behaviour; Cireadian rhythm; Salinity; Temperature. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751997000100021 |
| |
|
|
| Donatti,Lucélia; Fanta,Edith. |
| The retina of Metynnis roosevelti Eigenmann, 1915, a very active freshwater fish, was investigated by light and electron microscopy and was found to have a complex neuronal structure that allows rapid responses of visual stimuli. Retina photoreceptors are double cones, single long cones, single short cones and rods. Cone inner segments are arranged as mosaics. The outer nuclear layer contains small nuclei of twin cones, long and wide nuclei of long single cones, spherical large nuclei of short cones, and small dense nuclei of rods. Horizontal, amacrine, bipolar and ganglion neurones are responsible for connections and integration between photoreceptor cells and afferent neurones. The pigmented epithelium comprises a single layer of cylindrical cells each... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish; Retina; Morphology; Red light. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000100011 |
| |
|
|
| Pessanha,André Luiz Machado; Araújo,Francisco Gerson; Azevedo,Márcia Cristina Costa de; Gomes,Iracema David. |
| A year-long beach seine survey at the continental margin of Sepetiba Bay, Rio de Janeiro State, Brazil, catching mainly young-of-the-year and juvenile fishes was carried out from July 1983 to June 1984, in order to describe the community structure and their spatial and seasonal variations. Fifty-five monthly samplied carried out in five sites in the marginal surf zone waters yielded 11,463 fishes in 82 species, 59 genera and 31 families. Gerreidae, Engraulidi-dae, Atherinidae and Ariidae families amounted 87.01% of the total catch in number, and 81% in weight. Cerres aprion Cuvier, 1829, Anchoa januaria (Steindachner, 1879), Anchoviella lepidentostole (Fowler, 1911), Atherinella brasiliensis (Quoy & Gaimard, 1824) and Neluma barba (Lacépède, 1803)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sepetiba Bay; Ichthyofauna; Fish; Bioecology. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000100022 |
| |
|
|
| Bennemann,Sirlei Terezinha; Orsi,Mário Luís; Shibatta,Oscar Akio. |
| The fish assemblage in a stretch of Tibagi river was studied during the period of one year, throught monthly sampling. It was observed that four fish species (Schizodon intermedius Garavello & Britski, 1990, Acestrorhynchus lacustris Reinhardt, 1874, Pimelodus maculatus Lacépède, 1803 and Steindachnerina insculpta Fernandez-Yepez, 1948) were very frequent and they represent all the main trophic groups. In order to characterize feeding activity, fat storage and reproduction the means degree of repletion, fat and maturation, obtained for each species in each month were compared among the four fish species. Steindachnerina insculpta, a detritivovous species was the one with the highest feeding activity while A. lacustris, a piscivorous fish, showed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish; Feeding activity; Gonadal development; Tibagi river; Paraná. |
| Ano: 1996 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751996000200018 |
| |
|
|
| Farias,Luciana Aparecida; Fávaro,Déborah Inês; Santos,José Osman; Vasconsellos,Marina Beatriz; Pessôa,Artemiza; Aguiar,Jaime Paiva Lopes; Yuyama,Lucia. |
| This study evaluated different cooking processes (roasted, cooked and fried) on total mercury (Hg) content in fish species most consumed by Manaus residents and surrounding communities, Amazon region. The results obtained for total Hg in natura and after the three types of preparation (roasted, cooked and fried) for 12 fish species showed a significant Hg concentration variation. In the present study the cooked and frying processes resulted in higher Hg losses for Pacu, Pescada, Jaraqui, Curimatã, Surubin and Aruanã fish species, most of them presenting detritivorous and carnivorous feeding habits. The higher Hg losses in the roasting process occurred for Sardinha, Aracu, Tucunaré, Pirapitinga, Branquinha and Tambaqui fish species, most of them being... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mercury; Cooking processes; Fish; Nutrition; Micronutrients. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672010000400015 |
| |
|
| |
|
|
| FREITAS¹*,Tiago Magalhães da Silva; SOUZA¹,Joao Batista de Souza e; PRUDENTE²,Bruno da Silveira; MONTAG²,Luciano Fogaça de Assis. |
| ABSTRACT Studies on the length-weight relationship (LWR) of fishes are an important tool to describe several biological aspects of the species. Consequently, these studies are relevant due the necessity of comprehension about fish life cycle. Thus, this study aimed to establish the length-weight relationship of the ten most common fish in the Lower Nhamundá River, left tributary of the Amazon River. The capture of fish was conducted in January 2008 using gill nets. A total of 807 individuals, ten species and three Orders (Characiformes, Siluriformes and Clupeiformes) were analyzed. The parameter b varied from 2.680 to 3.698. The LWR were shown for the first time for two species: Anostomoides laticeps and Ageneiosus polystictus. Finally, this research... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Growth pattern; Alometry; Fish; Amazonia. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672017000100075 |
| |
|
|
| COSTA,Igor David da; SOARES,Maiza Oliveira. |
| Trophic relationships in fish communities are affected by the availability of resources, which in turn is affected by spatial and temporal variations throughout the year. The aims of this study were to characterize the diet of A. tetramerus in a streamlet in the north of Brazil and compare its composition in different hydrological seasons (wet and dry seasons). Collections were performed every two months from October 2011 to September 2012 with the aid of seine nets, hand net and fishing traps in the streamlet located in the Machado River drainage basin in the Rondônia state. Most of the specimens collected were quite small (< 40 mm) and had empty stomachs. Our results showed that A. tetramerus feeds on a wide variety of items of plant origin, such as... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish; Perciformes; Amazon; Feeding habits; Ornamental fish. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672015000400365 |
| |
| Registros recuperados: 501 | |
|
|
|
