O presente artigo teve como objetivos avaliar o enquadramento legal para o uso e descarte de efluentes em corpos hídricos utilizados pela atividade aquícola no estado do Amazonas, por meio do acesso às informações de controle e monitoramento de parâmetros ambientais, sendo o principal o resultado dos laudos das análises de indicadores de qualidade da água definidos como legalmente exigidos para um Programa de Monitoramento Ambiental (PMA), solicitado como procedimento obrigatório para manutenção da licença ambiental de empreendimentos classificados como de alto potencial de impactos ambientais pelo Órgão Estadual de Meio Ambiente (OEMA). De acordo com a legislação vigente, verificou-se que os principais parâmetros de variáveis físico-química dos empreendimentos pelo PMA encontravam-se dentro dos padrões aceitáveis permitidos. Não se descarta, porém, a cobrança da aplicação de melhores mecanismos de avaliação e controle de impactos ambientais como exigência para a regularização da atividade, como a aplicação de técnicas de Boas Práticas de Manejo (BPM’s) e implantação de sistemas de tratamento de efluentes nos empreendimentos.
The objective of the present study was to determine the apparent digestibility of juveniles of matrinxã Brycon amazonicus fed diets with different levels of protein. The experimental design was completely randomized, where the treatments consisted of four levels of protein in the diets (28, 32, 36 and 40%) and five replicates (water boxes) with 10 juveniles of matrinxã each. Diets were offered four times a day, and feces were collected twice a week, along 28 days, for digestibility analysis. Data collected were subjected to polynomial regression at 5% significance. Differences (p<0.05) were observed in dry matter digestibility, with higher digestibility according to increasing levels of protein in the diets. This behavior was directly expressed in the digestibility of nutrients by juveniles of matrinxã, such as % ash, % crude protein, apparent digestible energy, % digestibility of apparent digestible energy and energy: protein ratio. However, this was not observed (p > 0.05) in the digestibility of % ether extract. Digestibility of N, P, Ca, Mg, Cu and Zn presented linear positive (p < 0.05) behavior, in which the use of these minerals increased with the increase in the level of protein in the diets. However, the digestibility of K, Fe and Mn reduced (p < 0.05) with increasing protein levels in the diets. Thus, it can be concluded that the rise in protein level in diets for juveniles of matrinxã improves nutrient digestibility. The results of this study indicated that 40% crude protein in the diets provided better results.
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