Effects of dietary supplementation with Bacillus velezensis on the growth performance, body composition, antioxidant, immune-related gene expression, and histology of Pacific white shrimp, Litopenaeus vannamei Arwa E. M. Abdelsamad, Rashad E. M. Said, Mona Assas, Alkhateib Y. Gaafar, Awatef H. Hamouda, et al. BMC Veterinary Research, 2024 In recent decades, probiotics have become an acceptable aquaculture strategy for shrimp growth promotion and immune modulation. This study aimed to evaluate the effect of Bacillus velezensis on Litopenaeus vannamei following a 60-day trial. L. vannamei (3 ± 0.4 g) were distributed into four groups with three replicates per group and fed an isonitrogenous diet supplemented with B. velezensis at 0, 1 × 107, 1 × 108, and 1 × 109 CFU/g, which were defined as the control, G1, G2, and G3 groups, respectively. B. velezensis significantly improved the growth, survival rate, and proximate body composition of L. vannamei (P < 0.05). All groups fed the B. velezensis diet showed significant increases in digestive enzymes (lipase, amylase, and protease), superoxide dismutase (SOD; G3), catalase (CAT; G3, G2, and G1), lysozyme activity (G3 and G2), immunoglobulin M (IgM), bactericidal activity BA%, alkaline phosphatase (AKP), and acid phosphatase (ACP) compared with the control group (P < 0.05). Malondialdehyde (MDA), triglycerides, cholesterol, high-density lipoprotein (HDL), low-density lipoprotein (LDL), aspartate aminotransferase (AST), and alanine aminotransferase (ALT) levels were significantly decreased in all groups fed B. velezensis diet compared with the control group (P < 0.05). The expression levels of SOD (G3), LZM, and serine proteinase genes were significantly higher in L. vannamei fed diets containing B. velezensis than in the control group (P < 0.05). This is the first study to address the effects of B. velezensis on the expression of the LZM and serine proteinase genes in L. vannamei. L. vannamei fed diet containing B. velezensis had more B and R cells in its hepatopancreas than did the control group. In conclusion, B. velezensis is a promising probiotic that can be safely added to the diet of L. vannamei with 1 × 109 CFU/g. Its application had a positive influence on the health status, survival rate, nutritional value, and immunity of L. vannamei.
Antiviral activity of sulphated specialized metabolites from sea urchin Clypeaster humilis: in vitro and in silico studies Fahd M. Abdelkarem, Hamdy K. Assaf, Yaser A. Mostafa, Aldoushy Mahdy, Modather F. Hussein, et al. Rsc Advances, 2024 Chemical analyses of the sea urchin Clypeaster humilis yielded twelve compounds including; a new sulfonic acid derivative (7R) tridec-1-en-7-yl hydrogen sulphate (1), pyridine-3-yl methane sulfonate (2), boldine (12), and nine known compounds (3–11).
Seasonal variations of some heavy metal concentrations in seawater, sediment, and the surf clam, Mactra olorina (Philippi, 1846) in the Great Bitter Lake, Suez Canal, Egypt Egyptian Journal of Aquatic Biology and Fisheries, 2022
