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| Fracácio,Renata; Verani,Nelsy Fenerich; Espíndola,Evaldo Luiz Gaeta; Rocha,Odete; Rigolin-Sá,Odila; Andrade,Cássio Arilson. |
| The objective of this work was to assess the toxicity of sediment samples from six cascade reservoirs in Tietê river system, in São Paulo State, Brazil, through chronic-partial toxicity bioassays with Danio rerio larvae as test-organisms. Histology of gills and biometric measurements were used to determine the existence of toxicity problems. The alterations on gill morphology here detected were considered of first stage (hyperplasia, lamellar junction and excess of mucous cells) in the first reservoirs and very slight in the last ones. The biometric analysis pointed to inadequate conditions for the growth of the test-organisms when exposed to the sediment of the rivers and upstream reservoirs and also indicated an improvement of environmental conditions... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gill morphology; Sediment toxicity; Danio rerio; Tietê reservoirs; Pollution. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000400023 |
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| SEVERI,W.; RANTIN,F. T.; FERNANDES,M. N.. |
| The pacu Piaractus mesopotamicus (Holmberg, 1887), is a commercially important serrasalmid fish endemic to the Paraná-Paraguay River basin, and one of the most widely cultivated native fish species in the Neotropics. As a migratory species, also inhabiting temporary pools subjected to hypoxic conditions, the species presents a high plasticity concerning respiratory adaptations. In order to supplement basic knowledge on the respiratory physiology and morphology of this species, some structural features of pacu gills, such as filament and lamellae structure, and circulatory pattern are described in this paper. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gill structure; Gill morphology; Pacu; Piaractus mesopotamicus. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300014 |
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| Duncan,Wallice Paxiúba; Silva,Maria Isabel da; Fernandes,Marisa Narciso. |
| This comparative study of gill morphometrics in near-term embryos of freshwater stingray potamotrygonids examines gill dimensions in relation to neonatal lifestyle and habitat. In embryos of the potamotrygonids Paratrygon aiereba, Plesiotrygon iwamae, Potamotrygon motoro, Potamotrygon orbignyi, and cururu ray Potamotrygon sp. the number and length of filaments, total gill surface area, mass-specific surface area, water-blood diffusion distance, and anatomical diffusion factor were analysed. In all potamotrygonids, the 3rd branchial arch possessed a larger respiratory surface than the other gill arches. Larger embryos had more gill surface area and large spiracles, which are necessary to maintain the high oxygen uptake needed due to their larger body size.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Foetus; Gill morphology; Hypoxia tolerance; Potamotrygonid; Respiratory area. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000100123 |
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| Alves, Luiz Fernando de Souza; Saravy, Taiany Miranda; Baldo, Grace Alessandra Araújo; Gabriel, Andrea Maria de Araújo; Cavichiolo, Fabiana. |
| To pathological assessments or recognition of changes in the morphology of these is necessary knowledge of a normal morphological pattern, being this then the goal of this study. Were collected 20 animals (Piaractus mesopotamicus), from cultivation environments the region of Grande Dourados, with total length of 35 cm and 750 g approximately. During data collection, the animals were anesthetized with benzocaine, euthanized and dissected for macroscopic evaluation of organs "in situ". After, collected the gills, fixed in Bouin solution and stained by the usual method Hematoxylin-eosin and alcian blue technique+ PAS. Macroscopically it was observed that these had brilliant crimson red coloration, located internally, protected by beeswax, with numerous traces... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Histology; Gill morphology; Teleosts.. |
| Ano: 2017 |
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/14316 |
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