Effects of dietary supplementation with filamentous microalgae (Oedocladium sp. or Tribonema ultriculosum) on growth performance, fillet fatty acid composition, skin pigmentation, and immune response of yellow catfish Pelteobagrus fulvidraco

Abstract

A 40‐day feeding trial was conducted to investigate the effect of dietary microalgae Oedocladium sp. or Tribonema ultriculosum supplementation on growth performance, fillet fatty acid composition, skin pigmentation, and immune response of yellow catfish Pelteobagrus fulvidraco. Two hundred and seventy experimental fish (51.19 ± 1.17 g) were distributed among nine net cages (2 × 2 × 2 m3) in a randomized design and were fed diets containing 0% (control), 4% Oedocladium meal (Oedocladium), and 5% T. utriculosum meal (Tribonema) to apparent satiation twice a day. After the feeding trial, a hypoxic stress test was conducted to evaluate the effect of dietary microalgal supplementation on fish immune response. Compared to the control, microalgal supplementation did not affect fish growth performance. Dietary supplementation of T. utriculosum significantly increased fillet contents of palmitoleic acid by 100.44% and eicosapentaenoic acid by 12.51%, while the supplementation of Oedocladium meal in diet significantly increased the fish skin ventral lutein content by 61.6%. In addition, dietary Oedocladium or T. utriculosum supplementation significantly increased the plasma total superoxide dismutase activity (before hypoxic stress) and complement component 3 contents (after hypoxic stress). The addition of T. utriculosum meal also significantly increased the plasma immunoglobulin M content regardless of hypoxic stress. These results demonstrated Oedocladium sp. and T. utriculosum can be used to enhance fillet nutritional quality, skin pigmentation, and fish immune response.

Grazing Effects of Xenocypris davidi Bleeker (Cyprinidae, Cypriniformes) on Filamentous Algae and the Consequent Effects on Intestinal Microbiota

“…Some flamentous microalgae, such as Oedocladium sp. and Tribonema sp., have been confrmed to be used as feed ingredients to improve fsh fesh quality, nutritional quality, and microalgal supplementation so that the does not fsh growth performance is not afected [39,40]. In this study, after feeding with Spirogyra, especially S2, an increase in the weight of the fsh was observed, indicating that Spirogyra can be digested and utilized by X. davidi Bleeker.…”

Dietary Chlorella vulgaris mitigated the adverse effects of Imidacloprid on the growth performance, antioxidant, and immune responses of common carp (Cyprinus carpio)

“…It is known that antioxidant enzymes in fish are usually affected by nutritional factors. Superoxide dismutase (SOD) production and catalase (CAT) activity are widely used as non-specific immune indices in fish as well as their activities are key indicators of the antioxidant capability of cells (Shiau et al, 2015;Nayak et al, 2020;Chen et al, 2021).…”

“…Microalgae, namely Chlorella sp., have recently received a great deal of attention for their high nutritional value, antioxidant capacity, and health benefits (Pina-Pérez et al, 2019). Adding a certain dose of microalgae dry powder to fish diet can result in a significant increase in their immune resistance to toxins (Nayak et al, 2020;Chen et al, 2021;Nagappan et al, 2021).…”

Alternative Proteins for Fish Diets: Implications beyond Growth

“…Yellow catfish were fed Oedocladium sp. and Tribonema ultriculosum at 4 and 5% inclusion levels, respectively, for 40 days and submitted to acute hypoxia stress [164]. Both microalgae were able to enhance plasma complement factor C3 levels after acute stress, whereas dietary T. ultriculosum improved plasma IgM content, regardless of hypoxic stress.…”