Influence of stocking density on water quality and growth performance in production of juvenile pirarucu, Arapaima gigas, in irrigation canals / Influência da densidade de estocagem na qualidade da água e na performance de crescimento na produção de juvenis de pirarucu, Arapaima gigas, em canais de irrigação

The pirarucu is reared in cages under intensive systems or ponds under semi-intensive systems. This research evaluates the effect of stocking density on water quality, survival and growth of juvenile pirarucu reared in net pens located in irrigation canals. Pirarucu (193.3±37.3 g; 31.5±2.1 cm) were stocked at densities of 3.6, 6 or 10 fish m-3 in 4.2 m3 net pens installed at the Irrigation District of the Coastal Tablelands (DITALPI), Parnaíba (Piauí, Brazil), with three replicate for each density. Fish were fed a formulated diet containing 40% crude protein and 14.2 MJ kg-1 of feed and cultured for 180 days. The physicochemical parameters of the water were at satisfactory levels for fish culture. Survival was 100.0% in all density tested. The final weight, weight gain and and absolute growth rate (AGR) were higher for the medium stocking density (6 fish m-3) than for fish at low stocking density (3.6 fish m-3) and high stocking density (10 fish m-3). Final weight gain, survival, and productivity have demonstrated that the production of pirarucu in net pens using water from irrigation canals can become a viable strategy and a cheaper alternative to increase fish production. In addition, it improves the efficient use of water by integrating two productive activities, agriculture and aquaculture

Expanding tropical forest monitoring into Dry Forests: The DRYFLOR protocol for permanent plots

This is the final version. Available on open access from Wiley via the DOI in this recordSocietal Impact Statement Understanding of tropical forests has been revolutionized by monitoring in permanent plots. Data from global plot networks have transformed our knowledge of forests’ diversity, function, contribution to global biogeochemical cycles, and sensitivity to climate change. Monitoring has thus far been concentrated in rain forests. Despite increasing appreciation of their threatened status, biodiversity, and importance to the global carbon cycle, monitoring in tropical dry forests is still in its infancy. We provide a protocol for permanent monitoring plots in tropical dry forests. Expanding monitoring into dry biomes is critical for overcoming the linked challenges of climate change, land use change, and the biodiversity crisis.Newton FundNatural Environment Research Council (NERC)Fundação de Amparo à Pesquisa do Estado de São PauloCYTE

Bullying: desafíos para a convivencia ética no combate ao assedio

Este artigo registra parte dos resultados de uma atividade de extensão universitária realizada junto a trabalhadores na educação e saúde do município de Humaitá, sul do Estado do Amazonas, onde foram realizadas atividades de reflexão-ação acerca da convivência ética e democrática. Está organizado em duas partes: a primeira destaca aspectos conceituais e filosóficos acerca do tema; a segunda parte apresenta os resultados da intervenção em contextos da educação e da saúde