The Effects of Dietary Arthrospira platensis on Oxidative Stress Response and Pigmentation in Yellow Catfish Pelteobagrus fulvidraco

Abstract

In aquaculture, fish are often exposed to several stress conditions, which will cause oxidative disorder and bring about health and quality problems. Arthrospira platensis contains abundant bioactive ingredients, which are beneficial for animal health. This study was conducted to investigate the effects of A. platensis on pigmentation, antioxidant capacity, and stress response after air exposure of fish. A total of 120 yellow catfish Pelteobagrus fulvidraco (initial weight 70.19 ± 0.13 g) were divided into three tanks per treatment and fed diets supplemented with 0 g kg−1 A. platensis (CON) and 20 g kg −1 A. platensis (AP) for 65 days. The results indicated that dietary A. platensis had no effects on the growth of yellow catfish. The AP diet significantly reduced lactic acid (LD) and cortisol levels stimulated by air exposure stress (p < 0.05). Dietary A. platensis significantly increased plasma superoxide dismutase (SOD) and glutathione peroxidase (GPX) activities and glutathione (GSH) contents, and the relative expression levels of sod and cat, to protect against oxidative stress caused by air exposure (p < 0.05). The AP diet significantly improved the relative expression level of nrf2 (nuclear factor erythroid-2 related factor 2), while the relative expression level of keap1 (kelch-like ECH associated protein 1) was downregulated, and the protein levels of liver Nrf2 were significantly increased after air exposure stimuli (p < 0.05). Dietary A. platensis significantly increased skin lutein contents, increased skin redness, yellowness and chroma (p < 0.05), and improved body color abnormalities after oxidative stress caused by air exposure stimuli. Skin yellowness was associated with lutein contents and the expression levels of some antioxidant genes to varying degrees. Overall, dietary A. platensis could be utilized as a feed additive to activate the antioxidant response, as well as alleviate oxidative stress and pigmentation disorder induced by air exposure.

Colour characteristics, phenolic content and antioxidant activity of Spirulina platensis soaked in basil (Ocimum basilicum) leaves extract

“…Carotenoid generally contributes to the yellowness or redness colour. However, some studies showed that carotenoid induces yellowness colour more than redness on the muscle of rainbow trout (Pulcini et al ., 2021) and yellow catfish (Liu et al ., 2022). Furthermore, phycocyanin pigment in S. platensis with the dark blue green colour might contribute to the increase in greenness more than blueness; hence, the b* ‐value did not show a negative value in all samples.…”

Dietary xanthophyll improved growth, antioxidant, pigmentation and meat quality in the southern catfish (Silurus soldatovi meridionalis Chen)

“…A previous study on discus fish ( Symphysodon aequifasciatus ) found that carotenoids accumulated more in dorsal fin than in skin and muscle ( Song et al., 2017 ). A study in yellow catfish ( Pelteobagrus fulvidraco ) by Liu et al. (2022) also showed that carotenoids were more likely to be deposited in the skin than in the liver.…”

Fish microbiota repel ovipositing mosquitoes

“…This could explain the total lack of response to a mixture containing both an attractive and repelling bacterium (Figure 4). Low (~1 mg/L) concentrations of CuSO 4 altered the bacterial community structure on the skin of adult Snook (Tarnecki et al., 2021) and the gills of Yellow catfish (Zhou et al., 2023). However, this effect likely differs between fish species.…”