Results 131 to 140 of about 634 (141)
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Lower light intensity reduces larval aggression in matrinxã, Brycon amazonicus
Behavioural Processes, 2018Brycon amazonicus shows a high frequency of aggressive behavior, which can be a limiting factor in intensive farming systems. Environmental changes can modulate the social interactions of fish and reduce aggression during the different stages of production.
Lopes, Ana Caroliny C. +2 more
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Dietary l-tryptophan alters aggression in juvenile matrinxã Brycon amazonicus
Fish Physiology and Biochemistry, 2011This study evaluated the effect of dietary supplementation with L: -tryptophan (L-TRP), a serotonin precursor, on the aggressiveness of juvenile matrinxã Brycon amazonicus. Fish were kept in individual aquaria for 7 days receiving the diets: D1 (control: 0.47% of TRP), D2 (0.94% of TRP), D3 (1.88% of TRP), and D4 (3.76% of TRP).
Bejo Wolkers, Carla Patricia +3 more
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Physiology & Behavior, 2015
The dichotomic effect of a cortisol level rise in vertebrate behavior has been widely observed. Generally, a chronic increase of the hormone level inhibits aggression, while an acute rise increases aggression. However, in this study, we show that this increase in aggression through an acute rise of cortisol also depends on the context in which the ...
Serra, Monica +2 more
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The dichotomic effect of a cortisol level rise in vertebrate behavior has been widely observed. Generally, a chronic increase of the hormone level inhibits aggression, while an acute rise increases aggression. However, in this study, we show that this increase in aggression through an acute rise of cortisol also depends on the context in which the ...
Serra, Monica +2 more
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Aquatic Toxicology, 2008
The effects of cadmium exposure on both environment exploration and behavioral responses induced by alarm substance in matrinxã (Brycon amazonicus), a fish species endemic to the Amazon basin, were investigated. Fish exposed to 9.04+/-0.07 microg/L waterborne cadmium for 96h followed by 24h depuration period in clean water, were video-recorded for 15 ...
Honda, Rubens Tomio +2 more
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The effects of cadmium exposure on both environment exploration and behavioral responses induced by alarm substance in matrinxã (Brycon amazonicus), a fish species endemic to the Amazon basin, were investigated. Fish exposed to 9.04+/-0.07 microg/L waterborne cadmium for 96h followed by 24h depuration period in clean water, were video-recorded for 15 ...
Honda, Rubens Tomio +2 more
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Metabolical effects of Folidol 600 on the neotropical freshwater fish matrinxã, Brycon cephalus
Environmental Research, 2004The neotropical freshwater fish matrinxã, Brycon cephalus (Günther, 1869), was exposed to 1/3 of 96 h-LC50 of Folidol 600 (methyl parathion) for 96 h and allowed to recover for 24, 48, 96, and 192 h. Acetylcholinesterase (AChE), alanine aminotransferase (ALAT), aspartate aminotransferase (AAT), lactate dehydrogenase (LDH), malate dehydrogenase (MDH ...
Lucia Helena, de Aguiar +4 more
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Fish Physiology and Biochemistry, 2015
The neural circuitry for social behavior and aggression appears to be evolutionarily conserved across the vertebrate subphylum and involves a complex neural network that includes the hypothalamus as a key structure. In the present study, we evaluated the changes in monoamine levels in the hypothalamus and on serum cortisol and plasma glucose of ...
Wolkers, Carla Patrícia Bejo +2 more
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The neural circuitry for social behavior and aggression appears to be evolutionarily conserved across the vertebrate subphylum and involves a complex neural network that includes the hypothalamus as a key structure. In the present study, we evaluated the changes in monoamine levels in the hypothalamus and on serum cortisol and plasma glucose of ...
Wolkers, Carla Patrícia Bejo +2 more
openaire +3 more sources
Light and electron microscopy oogenesis in matrinxã, Brycon cephalus.
Journal of submicroscopic cytology and pathology, 2003Oocyte development has been divided into 5 distinct stages in the reared matrinxã, Brycon cephalus, based on morphological criteria by light and transmission electron microscopy: I) chromatin-nucleolus; II) perinucleolar; III) cortical alveoli; IV) vitellogenesis; V) final maturation.
E, Romagosa +3 more
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Transport stress in matrinxã, Brycon cephalus (Teleostei: Characidae), at different densities
Aquaculture International, 2002Matrinxa, Brycon cephalus, is a nativeteleost fish from the Amazon Basin, and is of economic importance forcultivation for food and sport in Brazil. Mortality losses due to handling andtransport of this stenohaline freshwater species are common. The effects oftransportation at different densities on the biochemical stress responses ofmatrinxa (mean ...
Carneiro, PCF +1 more
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Effect of high levels of dietary vitamin C on the blood responses of matrinxã (Brycon amazonicus)
Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 2007Juvenile matrinxã (Brycon amazonicus) were fed with different dietary vitamin C (ascorbic acid or AA) concentrations for 2 months in order to evaluate its effect on the physiological condition of this species. Five treatments were tested: Reference diet-RD (350 mg AA kg(-1) and 45% crude protein commercial feed); C400, C500, C600 and C800 with ...
Affonso, Elizabeth Gusmão +10 more
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PRÁTICAS REPRODUTIVAS DE ESPÉCIES AMAZÔNICAS EM CATIVEIRO: TAMBAQUI E MATRINXÃ
2021Alzira Miranda de Oliveira +6 more
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