A5017870953- Fish biology, ecology, and behavior
- Fish Biology and Ecology Studies
- Aquatic Ecosystems and Phytoplankton Dynamics
- Fish Ecology and Management Studies
- Water Quality and Pollution Assessment
- Aquaculture Nutrition and Growth
- Marine and coastal ecosystems
- Marine and fisheries research
- Aquatic Ecosystems and Biodiversity
- Environmental Toxicology and Ecotoxicology
- Biodiesel Production and Applications
- Aquatic Invertebrate Ecology and Behavior
- Marine Invertebrate Physiology and Ecology
- Petroleum Processing and Analysis
- Marine and coastal plant biology
- Algal biology and biofuel production
- Freshwater macroinvertebrate diversity and ecology
- Lubricants and Their Additives
- Aquaculture disease management and microbiota
- Wastewater Treatment and Nitrogen Removal
Universidade Federal do Rio Grande do Norte
2006-2021
University of Glasgow
1989-1990
North Eastern Hill University
1977
We report the occurrence of cyanobacterial blooms and presence cyanotoxins in water samples from Armando Ribeiro Gonçalves reservoir (06 degrees 08 S 37 07 W), located state Rio Grande do Norte, semiarid region northeastern Brazil. The species were identified quantified during rainy dry seasons year 2000. Cyanotoxins such as microcystins, saxitoxins cylindrospermopsins analyzed using HPLC ELISA methods. mixed toxic Cylindrospermopsis raciborskii, Microcystis spp (M. panniformis, M....
The Phytoplankton community and the abiotic factors of Cruzeta reservoir were studied at three depths, surface, middle (2 m) bottom, from September, 2004 to June, 2005, in order characterize environment assess possible that influence compositional change phytoplankton. Ninety species belonging 6 classes (Chlorophyceae, Bacillariophyceae, Cyanophyceae, Dinophyceae, Chrysophyceae Euglenophyceae) identified with 66 80 taxonomic units dry rainy season. most representative class terms richness...
The aim of this work was to study the eutrophication in tropical freshwater ecosystems and consequent cyanobacterial bloom formation economical damage fisheries harmful effects public health. Mass fish mortality due toxin producing blooms registered during December 2003 Marechal Dutra Reservoir, Acari/RN, Northeast Brazil. Phytoplankton samplings were carried out on alternate days episode monthly January June 2004. identified quantified from seston samples liver dead fishes using standard...
The current study analysed spatial-temporal modifications of the phytoplankton community and water quality, during dry wet seasons. was studied in three areas: Armando Ribeiro Gonçalves Reservoir (ARG), which is an important public use reservoir RN, Pataxó Channel (PC-before treatment), Itajá, after treatment (WTP). Water samples from were collected both (January, February November, 2006) seasons (March to June, 2006). Quali-quantitative analyses carried out. Results indicated a qualitative...
The reproductive ecology of the freshwater fish Cichla monoculus Spix, 1831 (Osteichthyes: Cichlidae) was investigated in Campo Grande Reservoir, Northeast Brazil. Rainfall, temperature, pH, dissolved oxygen and electrical conductivity water were recorded monthly. Fish collected on a monthly basis measured, weighted, dissected, sexed stage maturation gonads assessed by macro microscopic means. semi-arid study region has short spells rain 2-3 months duration interspersed with dry seasons. A...
The Serra Spanish mackerel, Scomberomorus brasiliensis is an important fishery resource of the Atlantic Ocean and a major component artisanal fisheries in northern northeastern Brazil. Ovarian development spawning period S. were investigated using both macroscopic histological techniques. Mean monthly values GSI ovarian maturation indicate that main occurs during rainy season.
A traira, Hoplias malabaricus e o cascudo, Hypostomus pusarum sao especies de peixes que apresentam importância ecologica economica nos ecossistemas aquaticos neotropicais. O presente trabalho comparou os aspectos morfologicos do trato digestorio H. , relacionando-os com seu habito alimentar. No periodo julho 2011 a junho 2012, foram capturados 45 especimes 33 utilizando-se rede espera tarrafa no acude Marechal Dutra, Acari, RN. Foram obtidos cada exemplar comprimento total peso corpo....
AbstractThe present study focuses on the structure and function of phytoplankton community during periods marked changes in hydrological traits, influenced by an atypical climatic event (La Niña) its impact Armando Ribeiro Gonçalves Reservoir Rio Grande do Norte, situated Caatinga biome northeastern Brazil. The main questions addressed were: What are effects environmental factors temporal variation Morphologically Based Functional Group (MBFG) community? How does composition cyanobacterial...
O presente trabalho verificou as táticas e estratégias reprodutivas de sete espécies peixes água doce do Estado Rio Grande Norte, Brasil. Para doce, três padrões foram propostas: (1) estrategistas equilibrio (K), que são tamanho corporal grande, primeira maturação tardia, desovas repetidas, com longo período vida cuidado parental; (2) sazonais, intermediário a fecundidade intermediária alta sem (3) oportunistas (r), pequeno precoce, curto, repetidos pouco ou nenhum parental. Os aspectos...
This work presents information regarding the biology and state of conservation an endangered annual fish Hypsolebias antenori. Fish were captured from small seasonal pools located in Northeastern Brazil. The total body length, mass, sex ratio, first sexual maturity investigated. sampled population showed dimorphism. There was a predominance females (60%) over males (40%) with ratio 1: 1.4 bigger heavier than females. Amplitude length ranged 2.6 to 7.1cm (4.1±1.15) that 2.2 5.4cm (3.6±0.9)....
O presente trabalho verificou as estratégias reprodutivas de sete espécies peixes marinhos da região costeira do Rio Grande Norte, Brasil. Traços história vida dos em ambientes relativamente estáveis sugerem um modelo três reprodutivas: (1) estrategistas oportunistas, são pequeno tamanho corporal com primeira maturação precoce, período curto baixa fecundidade; (2) sazonais, intermediário, intermediária e fecundidade a alta; (3) equilíbrio, grande, tardia longo vida, além alta fecundidade. Os...
Prochilodus brevis Steindachner 1875, e uma especie de peixe dulcicola nativa da regiao semiarida do Brasil a compreensao biologia reprodutiva importante para sua conservacao gestao. O presente trabalho teve como objetivo verificar os aspectos reproducao P. parâmetros ambientais acude Marechal Dutra, Rio Grande Norte, Brasil. Os peixes foram capturados, medidos, pesados dissecados. As gonadas removidas pesadas identificacao sexo determinacao macroscopica dos estadios maturacao das gonadas. A...
This study concerns the reproductive strategy of freshwater fish, Leporinus piau, native to Brazilian semi-arid region. The hypothesis this work predicts that species would spawn during rainy season, presenting a seasonal strategy. investigated structure total body length and mass, sex ratio, size at first sexual maturity, developmental stages gonads, fecundity, gonadosomatic index (GSI), condition factor (K) spawning season L. piau. Twelve monthly samplings (mean n = 18) were carried out in...
O peixe cascudo, Hypostomus pusarum é de importância ecológica e econômica dos ecossistemas aquáticos da região neotropical. presente estudo verificou os aspectos alimentares reprodutivos dessa espécie no açude Marechal Dutra, Acari, Rio Grande do Norte. As capturas peixes foram realizadas durante o período julho 2011 a junho 2012, com auxílio pecadores locais, que utilizaram redes espera tarrafas.
The Lake Extremoz is one of the three big lakes in State Rio Grande do Norte. present work was carried out this lake during period October 2000 to September 2001, which included dry and rainy seasons. Parauchenipterus galeatus Linnaeus, 1766 represent 10% commercially important species captured from lake. Fish samples were collected on a monthly basis, besides registering rainfall, temperature, dissolved oxygen populational structure cangati stage maturation gonads determined, gonadosomatic...
Biodiesel is composed of saturated and unsaturated long chain fatty acid alkyl esters. Due to these compounds, there a susceptibility the autoxidation process. Castor biodiesel has excellent thermal oxidative stabilities due its chemical composition. Blends sunflower castor were obtained in ratios 20, 40, 60 80% m/m with intention study effect addition on induction period low stability, employing Rancimat method (EN 14112) P-DSC isothermal mode. The above mentioned blend containing 40% meets...
O objetivo deste estudo foi avaliar a diversidade do fitoplâncton e qualidade da agua Lago Jiqui em escalas espaciais temporais. Este ecossistema de doce uma importante fonte abastecimento para cidade Natal municipio adjacente Parnamirim, Rio Grande Norte. As amostras foram coletadas setembro 2008 aagosto 2009, quatro locais diferentes: margem lago, local agua, meio lago um dominado por macrofitas enraizadas flutuantes. das aguas superficiais fundo durante o periodo chuvoso seco, ciclo...
Frequency of phytoplankton community in reservoirs depends on several physical, chemical and biological factors, which turn are subjected to rainfall regime. This work presents temporal variations limnological parameters, frequent groups indices the Santa Cruz reservoir, Rio Grande do Norte, Brazil. The surface water samples reservoir were collected monthly during October, 2013 August, 2014, environmental parameters registered was identified. Mean temperature dry period 29°C rainy season...