Changes on physiological parameters of tambaqui (Colossoma macropomum) fed with diets supplemented with Amazonian fruit Camu camu (Myrciaria dubia)

<div><p>Abstract The physiological responses of juvenile tambaqui (Colossoma macropomum) fed commercial feed supplemented with different concentrations of camu camu (Myrciaria dubia) were evaluated. The design was completely randomized, with treatments arranged in a factorial design with three proportions of camu camu (15%, 30% and 45%) and a control treatment (100% commercial diet), with four replicates per treatment. A total of 96 tambaqui specimens were used, with a mean initial weight of 11.69 ± 2.68 g and a mean length of 7.06 ± 0.44 cm. After 30 days, hematological parameters, metabolic variables, growth and fish swimming performance were evaluated. The different proportions of camu camu in the diet did not cause significant changes to the tambaqui's hematological parameters during the feeding period, except for hemoglobin (Hb) concentration and mean corpuscular hemoglobin concentration (MCHC) after the 30th day, and hematocrit (Ht) after the swimming stress test, which increased significantly (p < 0.05). The significant increases in metabolic variables, such as cortisol, glucose, proteins and triglycerides, and in hematologic variables after the Ucrit test reflect, respectively, biochemical adaptations for maintenance of the energy mobilization process and a regulatory necessity in tissue oxygen demand during intense exercise. Fish fed 15% and 30% camu camu gained the most weight and achieved the best swimming performance, respectively. The results for camu camu concentrations above 30% suggest a saturation of its intrinsic properties in the diet at this level and a loss of nutrients from the commercial feed replaced by the fruit, reducing productive performance and nutritional assimilation.</p></div

"Ciência de potes quebrados": nação e região na arqueologia brasileira do século XIX

The paper explores distinct expectations created in different places and institutions with the archaeological discoveries taken place in Brazilian territory in the second half of 19th century. By means of a case study about the professional trajectory of Domingos Soares Ferreira Penna (1818-1888), founder of Museu Paraense in 1866 and traveling naturalist of Brazilian Museu Nacional between 1872 and 1884, the present article reconstructs the origins of scientific debates and disputes over the Amazonian archaeological heritage, in great evidence at that time, due to discoveries of pre-historic sites at Marajó Island, in the State of Pará. The intention is to demonstrate how the discourse about national identity, broadly used by the director of the Brazilian Museu Nacional, Ladislau de Souza Mello Netto (1838-1894), overshadowed political divergence and had little repercussion among Brazilian provinces that were building, at the time, their respective regional identities and historical narratives - to which archaeological evidences were equally fundamental