Performance and hematological variables of piavuçu whose diets were supplemented with phytobiotic and probiotic additives

Abstract

The performance and hematologic responses of juvenile piavuçu fish (Leporinus macrocephalus) that were fed with feeds containing garlic, cinnamon, and yeast before being submitted to stress from capture were evaluated. The experiment was conducted in the Fish Nutrition Laboratory (Laboratório de Alimentação e Nutrição de Peixes), where 192 piavuçu juveniles (3.09 ± 0.8 g) were distributed among 16 tanks (170 L), with a density of 12 fish per tank. The experiment consisted of four treatments and four repetitions. Treatments included the addition of 10 g Kg -1 garlic, 10 g Kg -1 cinnamon, and 9x10 5UFC g -1 of Saccharomyces cerevisiae yeast, in addition to a control diet that included no additives. The performance, body indices, and survival of the fish were evaluated. After the performance test, the fish were submitted to stress from capture, and the effect of the additives as a stress reducer was evaluated through hematologic analyses. Better weight gain and feed conversion ratios (P≤0.05) were observed in the fish fed with diets containing garlic and cinnamon; however, no alterations were noticed in the nutritional composition of fish carcasses, regardless of the treatment they were submitted to. A reduction in the number of leukocytes of the fish submitted to stress in all treatments was verified. It is possible to conclude that diets supplemented with garlic and cinnamon at the level of 10 g Kg -1 led to a better performance, while not influencing the hematologic standards after the stress from capture. canela e 9x10 5 UFC g -1 de levedura Saccharomyces cerevisiae e uma dieta controle, sem a inclusão de aditivo. Foram avaliados o desempenho, índices corporais e sobrevivência dos peixes. Após o ensaio de desempenho os peixes foram submetidos ao estresse de captura e o efeito dos aditivos como mitigador do estresse foi avaliado por meio de análises hematológicas. Observou-se melhor ganho de peso e conversão alimentar (P≤0,05) nos peixes alimentados com as dietas contendo alho e canela, porém não foram observadas alterações na composição bromatológica da carcaça em nenhum dos tratamentos. Verificou-se redução nos números de leucócitos dos peixes submetidos ao estresse em todos os tratamentos. Conclui-se que dietas suplementadas com alho e canela ao nível de 10 g Kg -1 apresentaram melhor desempenho, não influenciando nos parâmetros hematológicos após o estresse de captura.

Hematological and Hematopoietic Effects of Bactericidal Doses of Trans-Cinnamaldehyde and Thyme Oil on Cyprinus carpio Juveniles

“…Oreochromis niloticus fed diets with cinnamon nanoparticles showed an increase in innate immunity values including NBT ( Abdel-Tawwab et al, 2018 ). No changes in WBC, but an increase in neutrophil frequency and thrombocyte count in Leporinus macrocephalus fed feed supplemented with 10 g/kg of cinnamon was revealed ( de Lima et al, 2015 ). Feed containing 1% of cinnamon caused an increase in WBC and neutrophil frequency in Labeotropheus fuelleborni ( Amiri and Bahrekazemi, 2017 ).…”

“…To minimize antibiotic use in aquaculture, attempts have been undertaken to develop alternative therapies to prevent and treat bacterial diseases in fish. According to Chakraborty and Hancz (2011), herbal products have a broad spectrum of antipathogenic properties and can be applied orally. They act as immunostimulants that activate the innate defense mechanisms by triggering the activation of genes encoding the antimicrobial molecules.…”

Enrichment of Artemia sp. with autochthonous probiotics at different levels in larviculture of piauçu Megaleporinus macrocephalus

“…To increase the productivity of sustainable intensive fish farming, the use of probiotic bacteria has been adopted to promote intestinal microbiota balance, improve immunity and growth performance, as well as resistance to pathogens (Hoseinifar et al, 2018;Ringø et al, 2020). For piauçu, the only respective study performed so far focused on the allochthonous probiotic Saccharomyces cerevisiae, although it did not improve the physiology nor the production system of this species (Lima et al, 2015).…”