The need for a sustainable aquaculture is increasing the use of plant ingredients in replacement to fishmeal and fish oil in diets for tambaqui Colossoma macropomum, which is leading to not detectable levels of docosahexaenoic acid (DHA) in its flesh. We evaluated the effect of a finishing plant diet supplemented with 5% of microalgae meal from Schizochytrium sp. (MD) on tambaqui growth, on proximal composition and fatty acid content of its flesh, comparing it to a non‐supplemented diet. One hundred and sixty‐two fish (489.67 g) were distributed into six tanks (2,000 L) and fed the experimental diets for a 90‐day period. Three fish per tank were euthanized for analyses every 15 days. The MD did not affect the growth and proximal composition of fish flesh. The MD increased the DHA content (from 14.81 to 38.60 mg/g of lipids) and the n‐3:n‐6 ratio (from 0.16 to 0.51) in the flesh of fish, beginning on the 15th day and reaching the highest DHA content on the 71st day (39.81 mg/g of lipids). We recommend C. macropomum to be fed with a finishing diet supplemented with microalgae meal for 71 days before slaughter to improve the DHA content and n‐3:n‐6 ratio in the flesh.

-The objective of this work was to analyze the proximate and fatty acid composition of the dorsal and ventral muscles of wild pirarucu (Arapaima gigas) captured from a Brazilian Amazonian lake. Dorsal and ventral muscles were dissected out, freeze-dried, vacuum-packed, and had the proximate and fatty acid composition analyzed. Ash, total proteins, and lipids were inversely proportional to moisture and had higher levels in the ventral muscles. Twenty-seven fatty acids were quantified in both muscles without significant differences between them, except for the heneicosylic, palmitoleic, γ-linolenic, and dihomo-γ-linolenic acids. Saturated and monounsaturated fatty acids were predominant in both muscles. The eicosapentaenoic (EPA) and docosahexaenoic (DHA) acids were quantitatively similar: 9.25 (dorsal) to 10.14 (ventral) and 8.50 (dorsal) to 10.63 (ventral) mg g -1 of total lipids, respectively. The EPA+DHA content of the dorsal and ventral muscles were 113.25 and 165.78 mg 100 g -1 , respectively. The ratios of polyunsaturated/saturated (0.54 and 0.59 for the dorsal and ventral muscles, respectively), n-3/n-6 (0.20 and 0.21), and hypocholesterolemic/ hypercholesterolemic fatty acids (1.41 and 1.45) ratios, as well as the atherogenicity (0.59 and 0.53) and thrombogenicity (1.02 and 0.94) indices, indicate that pirarucu muscle is a good dietary source of EPA+DHA, and its nutritional lipid quality can be beneficial for human health.Index terms: Arapaima gigas, fatty acids, flesh lipid quality, n-3 Hufa, n-3/n-6, nutraceutical fish. Perfis nutricionais e lipídicos dos músculos dorsal e ventral em pirarucus selvagensResumo -O objetivo deste trabalho foi avaliar a composição proximal e de ácidos graxos dos músculos dorsal e ventral em pirarucus (Arapaima gigas) selvagens, capturados em um lago amazônico brasileiro. Os músculos dorsal e ventral foram dissecados, liofilizados, embalados a vácuo, e sua composição proximal e de ácidos graxos foram analisadas. Cinzas, proteínas totais e lipídeos foram inversamente proporcionais à umidade e apresentaram teores maiores no músculo ventral. Foram quantificados 27 ácidos graxos em ambos os músculos sem diferença significativa entre eles, exceto para os ácidos heneicosílico, palmitoleico, γ-linolênico e dihomo-γ-linolênico. Ácidos graxos saturados e monoinsaturados predominaram em ambos os músculos. O ácido eicosapentaenoico (EPA) e o docosahexaenoico (DHA) foram quantitativamente similares 9,25 (dorsal) a 10,14 (ventral) e 8,50 (dorsal) a 10,63 (ventral) mg g -1 do total de lipídeos, respectivamente. O conteúdo de EPA+DHA nos músculos dorsal e ventral foi 113,25 e 165,78 mg 100 g -1 , respectivamente. A proporção de ácidos graxos poli-insaturados/saturados (0,54 e 0,59 para os músculos dorsal e ventral, respectivamente), n-3/n-6 (0,20 e 0,21) e hipocolesterolêmicos/hipercolesterolêmicos (1,41 e 1,45), assim como os índices de aterogenicidade (0,59 e 0,53) e trombogenicidade (1,02 e 0,94), indicam que o músculo do pirarucu pode ser considerado uma boa fonte dietética de...

Due to the importance of ornamental fishing of silver arowana, as well as, Lago Grande lake as one of the main areas for capturing baby arowanas in Peru, the present study aimed to evaluate the productivity and the biologicalreproductive characteristics of the species in the lake, which is located in the lower basin of the Putumayo River and represents an area preferred by fishermen because the important populations of silver arowana inhabiting it. Analysis of population density, biometrics, sexual maturity, spawning, fecundity, sex ratio, water level of the lake and production of baby arowana were made. The study was developed between March and July of 2012 and to implement the activities of the study was important the participation of the Association of Fishermen "Fronteras Vivas". In general, the population density extrapolated to the lake area was 1.29 fish/ha. Of these, the density of progenitors in the lake was 1.19 fish/ha. Also, male animals had total length, standard length and total weight higher than females and it was observed that the spawning period occurred in synchronization with the start of the growing of the hydrological regime. The average number of oocytes produced by females of silver arowana in the study area was 201 and the sex ratio was equilibrated. Furthermore, the study shows the capacity of production of the lake. In order to this the water lever influenced in the production of baby arowanas. It is important to continue studying the species for regulate the fishing and recover populations.

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Increasing the consumption of healthy foods such as those containing long-chain polyunsaturated fatty acids (LC-PUFA) of the n-3 series, mainly the eicosapentaenoic (EPA; 20:5n-3), a precursor of eicosanoids that have anti-inflammatory action, and docosahexaenoic (DHA; 22:6n-3), which favours the prevention of cardiovascular, mental and retinal diseases, is a current trend (Cortegano et al., 2019;Swanson et al., 2012) and actually recommended by the WHO (2015) at levels equal to or greater than 200 mg of EPA+DHA per day. An adequate balance of n-3 and n-6 fatty acids, with an n-3/n-6 ratio greater than 0.2, will assure the nutraceutical function of these fatty acids in humans (Simopoulos, 2008), and fish are considered the main and less expensive source of LC-PUFA for a healthy diet (Tocher, 2003).Deposition and quality of lipids in the flesh of farmed fish are the function of contents and composition of dietary lipids (NRC, 2011). Therefore, because of its adequate LC-PUFA profile and contents, fish oil is the choice ingredient for the formulation of aquafeeds (Tacon & Metian, 2008). However, because fish oil