These products can be used in aquaculture as therapeutic and prophylactic agents against fish pathogens, with antimicrobial and/or immunostimulant properties.

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RESUMO O objetivo deste estudo foi analisar a influência da adição de farinha de resíduos de jundiá (Rhamdia quelen) na dieta de exemplares desta espécie sobre a bioquímica plasmática, parâmetros hepáticos e digestivos. No experimento I (EXP I), compararam-se dietas com 30% de farinha de carne e ossos suína (FCO), farinha de carcaça de jundiás com vísceras (FCJCV), farinha de carcaça de jundiá sem vísceras (FCJSV) e farinha de jundiás inteiros (FJI). No experimento II (EXP II), níveis de inclusão de FCJCV foram testados (0; 3,75; 7,5; 15 e 30%) ABSTRACT The objective of this study was to analyze the influence of the addition of jundiá (Rhamdia quelen) waste meal in the diet of this species, on plasmatic biochemistry, liver and digestive parameters. Experiment I (EXP I) compared diets with 30% of meat and swine bones (FCO), Jundiá carcass meal with viscera (FCJCV), Jundiá carcass meal without viscera (FCJSV) and full Jundiá meal (FJI). In experiment II (EXP II), different FCJCV levels were tested (0, 3.75, 7.5, 15, and 30%

One of the current challenges of global fish farming is developing plant‐based proteins as a feasible substitute for fishmeal in the formulation of aquafeeds. Substitution levels of fishmeal with hydrolyzed soybean meal (HSM) in diets for silver catfish (Rhamdia quelen) were evaluated for growth, protein metabolism and antioxidant activity. The experiment was carried out in a recirculation system of 20 tanks of 250 L. A total of 300 silver catfish juveniles were used to compose five treatments and four replicates per treatment. Levels of soybean hydrolysate (0%, 5%, 10%, 15% and 20%) were tested in diets (39% protein and 3,500 Kcal) for 60 days. Silver catfish growth was higher at all inclusion levels of HSM when compared to the control diet. No change was shown for body protein deposition. The production of nitrogenous compounds in the liver and muscle was also unaffected by any of the diets. The diet containing 20% HSM promoted an increase in the amounts of non‐protein thiols in the gills and brain. The HSM substitution levels of up to 20% of fishmeal in the diet increases growth and contributes to silver catfish antioxidant activity.

Este estudo avaliou a substituição parcial de farinhas de origem animal pelo farelo de tungue como fonte proteica no arraçoamento de carpa húngara. Os tratamentos compreenderam a inclusão de farelo de tungue in naturaou detoxificado (obtido após aplicação de tratamento químico ao farelo), e o tratamento referência consistiu de base proteica composta por farinha de carne e ossos suína e farinha de peixe. O período de alimentação foi de 63 dias. No decorrer de 30 dias experimentais não foi observada diferença em indicadores de crescimento entre os animais que consumiram as rações controle e com farelo de tungue tratado quimicamente, porém o consumo da ração com farelo de tungue in natura provocou redução no desempenho até o final do período experimental. Após 63 dias de arraçoamento, alguns indicadores de crescimento mostraram-se inferiores também para o tratamento que continha farelo de tungue tratado em relação ao controle. A análise bioquímica no plasma e no fígado revelou aumento de triglicerídeos, glicogênio, glicose e a utilização de outras fontes, possivelmente aminoácidos, como precursores energéticos na produção de energia quando os animais consumiram a dieta com farelo de tungue in natura em relação às demais, o que refletiu na menor concentração de proteína e na maior deposição de gordura na carcaça. Em relação à atividade de enzimas digestivas, tripsina apresentou atividade aumentada no tratamento com farelo de tungue in natura e protease ácida, quimotripsina, amilase e lipase não foram alteradas em nenhum dos tratamentos avaliados.

This study evaluated the substitution of fish meal with tilapia protein hydrolyzate (TPH) in diets for Silver catfish (Rhamdia quelen) by verifying the effects on growth, body composition, blood and biochemical parameters, and biomarkers of oxidative stress. Five isoproteic and isoenergetic diets (37% crude protein, 3,800 kcal/kg) were produced with different substitution levels of TPH (0%, 5%, 10%, 15% and 20%) for fishmeal. The hydrolyzate was obtained by enzymatic hydrolysis from carcasses of Nile tilapia (Oreochromis niloticus), which were exposed to swine pepsin enzyme at 36°C for four hours. The experimental design was completely randomised with five treatments and four replications. The inclusion of 20% TPH in diets for silver catfish increased the growth of Silver catfish juveniles. At levels above 5%, there was an increase in body protein deposition and the efficiency of oxidative metabolism.