Experiências de alimentação com tambaqui (Colossoma macropomum), pacu (Mylossoma sp), jaraqui (Semaprochilodus theraponura) e matrinchã (Brycon melanopterus)

Feeding trials with Colossoma macropomum, Mylossoma spec. Semaprochilodus theraponura and Brycon melanopterus have been concluded at the Institute Nacional de Pesquisas da Amazonia (INPA) since February 1977. Among five different pellet test diets (30% crude protein) containing 100%, 75%. 50%, 25% or 4,5% protein of vegetal origen. those containing 100% or 75% plant-protein (none or 75% animal protein) resulted in better growth rates when fed to alevins than those diets containing higher concentrations of animal protein (fishmeal). The conversion fators were 2,3, 3,2 and 3,9 respectively. Experiments with Brycon melanopterus using test diets of 31,6%. 35,6% and 41,6% crude protein. 50% of which was of fish meal origin, showed highly promising results with the 35% protein diet. In three experiments the conversion factors were 2.7, 1.4 and 1.5 respectively. Highest weight gain (3.4 g/fish/day) was observed when fish grew from 237 g to 406 g in a 50 days trial. From these preliminary results it was concluded that Brycon melanopterus and Colossoma macropomum show good potencial for intensive fish culture

Identifying Sumatran Peat Swamp Fish Larvae through DNA Barcoding, Evidence of Complete Life History Pattern

AbstractThe Eastern Sumatran peat swamp ecosystem is one of the most threatened and most poorly understood biotypes. Until recently, there is no scientific record concerning ichtyoplankton composition within this system and all fish's biodiversity research at this ecosystem relied on morphological diagnosis for adult stages. Two new fish records in this system, Rasbora pauciperforata and Ompok eugeneiatus were detected. Finally the authors concluded that, eleven fish species complete their life history in Eastern Sumatran peat swamp. This investigation enlarges the COI barcode database for the molecular identification of eastern Sumatran peat swamp fishes

Mangrove Crab Ucides cordatus Removal Does Not Affect Sediment Parameters and Stipule Production in a One Year Experiment in Northern Brazil

Mangrove crabs influence ecosystem processes through bioturbation and/or litter feeding. In Brazilian mangroves, the abundant and commercially important crab Ucides cordatus is the main faunal modifier of microtopography establishing up to 2 m deep burrows. They process more than 70% of the leaf litter and propagule production, thus promoting microbial degradation of detritus and benefiting microbe-feeding fiddler crabs. The accelerated nutrient turn-over and increased sediment oxygenation mediated by U. cordatus may enhance mangrove tree growth. Such positive feed-back loop was tested in North Brazil through a one year crab removal experiment simulating increased harvesting rates in a mature Rhizophora mangle forest. Investigated response parameters were sediment salinity, organic matter content, CO2 efflux rates of the surface sediment, and reduction potential. We also determined stipule fall of the mangrove tree R. mangle as a proxy for tree growth. Three treatments were applied to twelve experimental plots (13 m × 13 m each): crab removal, disturbance control and control. Within one year, the number of U. cordatus burrows inside the four removal plots decreased on average to 52% of the initial number. Despite this distinct reduction in burrow density of this large bioturbator, none of the measured parameters differed between treatments. Instead, most parameters were clearly influenced by seasonal changes in precipitation. Hence, in the studied R. mangle forest, abiotic factors seem to be more important drivers of ecosystem processes than factors mediated by U. cordatus, at least within the studied timespan of one year

Low levels of genetic diversity depicted from mitochondrial DNA sequences in a heavily exploited marine fish (Cynoscion acoupa, Sciaenidae) from the Northern coast of Brazil

The acoupa weakfish (Cynoscion acoupa - Sciaenidae) is a marine species of croaker with estuarine-dependent behavior, found in the western Atlantic from Panama to Argentina. It is one of the most exploited food fish on the northern coast of Brazil. In this study, DNA sequences were determined from the entire control region (D-loop) of the mitochondrial genome of 297 individuals collected during seven different months between December 2003 and August 2005 on the northern coast of Brazil (Amapá and Pará). Genetic variability expressed by haplotype (h = 0,892) and nucleotide (p = 0,003) diversities were low compared to other heavily exploited marine fish species from the western Atlantic and eastern Asia. AMOVA depicted a lack of genetic structuring among the samples from different years, indicating the presence of a single stock of C. acoupa within the sample area. The possible reasons for the low levels of genetic diversity are discussed. These results demonstrate a need for the monitoring of C. acoupa harvesting and the preservation of the estuaries within its geographic range, considering that this large fish depends on estuarine ecosystems during part of its life cycle

COMUNIDADE DE PEIXES COMO INDICADOR DE QUALIDADE AMBIENTAL DE ALGUNS CANAIS DE MARÉ DO ESTUÁRIO DO RIO PACIÊNCIA, SÃO LUÍS – MA

Nas análises de bioavaliação da qualidade dos ambientes aquáticos, têm sido essencial a aplicação de indicadores para avaliar a higidez da comunidade de peixes e determinar o status ambiental. Neste sentido, o presente estudo teve como objetivo identificar alterações na integridade biótica de alguns canais de maré do estuário do rio Paciência. Foram realizadas amostragens bimestrais nos canais de maré Iguaíba, Grande e Cristóvão, no período de janeiro/2006 a setembro/2007. Para avaliar as possíveis alterações na estrutura da ictiofauna, foram utilizadas as curvas (ABC) e o Índice de Integridade Biótica. As curvas demonstraram que o ambiente estuarino encontra-se moderadamente perturbado, enquanto o Índice de Integridade caracterizou a qualidade ambiental dos canais de maré entre muito pobre a regular. Alguns autores apresentam evidências que o estresse ambiental está associado à fragmentação da mata ciliar, ao aporte de efluentes líquidos e a interferência antrópica. Presume-se que o aumento dos níveis de perturbação nos canais de maré do estuário do rio Paciência poderá acarretar alterações na comunidade ictiofaunística destes locais. Os resultados sinalizam que os índices ecológicos estudados refletem eficientemente a qualidade ambiental dos canais de maré e as modificações ambientais sofridas pelo sistema estuarino.Palavras-Chave: Ictiofauna, indicadores ecológicos, qualidade ambiental, estuário do rio Paciência. AbstractFish community as indicator of environmental quality in tidal creeks of the Paciência River estuary, São Luís, BrazilIn bioassessments of the quality of aquatic environments, the use of indicators for the evaluation of the health of the fish community and the determination of its environmental status is essential. The aim of the present study was to identify changes in the biotic integrity of tidal creeks in the estuary of the Paciência River northern Brazil. Bi-monthly sampling was carried out in the Iguaíba, Grande and Cristóvão tidal creeks between January 2006 and September 2007. ABC curves and the Biotic Integrity Index were used for the assessment of possible changes in the structure of the ichthyofauna. The curves demonstrated that the estuarine environment is moderately disturbed and the Integrity Index characterized the environmental quality of the tidal creeks as very poor to fair. A number of authors offers evidence that environmental stress is associated to the fragmentation of riparian forests, the input of liquid effluents and anthropogenic interference. It is presumed that the increase in the degree of disturbance in the tidal creeks of the Paciência River estuary could trigger changes in the fish community in these creeks. The results indicate that the ecological indices studied efficiently reflect the environmental quality of the tidal creeks and environmental changes in the estuarine system.Key-words: Ichthyofauna; ecological indicators; environmental quality; Paciência estuar

Proceedings of the 13th annual conference of INEBRIA

CITATION: Watson, R., et al. 2016. Proceedings of the 13th annual conference of INEBRIA. Addiction Science & Clinical Practice, 11:13, doi:10.1186/s13722-016-0062-9.The original publication is available at https://ascpjournal.biomedcentral.comENGLISH SUMMARY : Meeting abstracts.https://ascpjournal.biomedcentral.com/articles/10.1186/s13722-016-0062-9Publisher's versio