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

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Animal Nutrition 2023年第2期13卷 101-115页

作者： Chaoqun He Haoyu Geng Yawen Qin Peng Yang Wenqiang Wang Kangsen Mai Fei Song Institute of Modern Aquaculture Science and Engineering(IMASE) Guangzhou Key Laboratory of Subtropical Biodiversity and BiomonitoringGuangdong Provincial Key Laboratory for Healthy and Safe AquacultureCollege of Life ScienceSouth China Normal UniversityGuangzhou510631China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519000China

Xanthophyll has multiple physiological functions to improve the quality of farmed *** present study aimed to investigate the effects of xanthophyll on the growth performance,antioxidation,immunity,pigmentation and meat quality of southern catfish(Silurus soldatovi meridionalis Chen).Juvenile southern catfish(18.35±0.04 g)were randomly allocated into 24 cages(30 juveniles per cage),and fed diets with different dietary xanthophyll levels(at 14,42,80,108,126 and 152 mg/kg,dry matter of diet)twice daily for 8 *** indicated that the diet with 80 mg/kg xanthophyll induced a higher specific growth rate(SGR),feed efficiency ratio and protein productive ***,the 80 mg/kg xanthophyll diet also increased complement 3,immunoglobulin M(IgM)and lysozyme content more than the other *** mRNA expression level of inflammation-related genes and antioxidant enzyme activities further confirmed the effects of 80 mg/kg dietary xanthophyll on improving immune *** present study also found that the 126 mg/kg xanthophyll diet significantly enhanced the content of total carotenoids and xanthophyll,hydroxyproline,collagen and amino acid in *** diet with 126 mg/kg xanthophylls also induced lower drip loss,thawing loss,centrifugal loss,cooking loss and higher muscle adhesiveness,cohesiveness,springiness,gumminess and chewiness than the other *** conclusion,quadratic regression model analysis based on SGR and IgM revealed that the optimum xanthophyll level in the diet was 86.78 and 84.63 mg/kg,***,broken line regression analysis based on xanthophyll content in dorsal skin and chewiness in muscle demonstrated that the optimal xanthophyll level was between 89.73 and 108.66 mg/kg in the diet of southern catfish(*** meridionalis Chen).

关键词： Xanthophyll Growth performance Antioxidant capacity fish quality Southern catfish(Silurus soldatovi meridionalis Chen)

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Preservation Potentials of Essential Oils of Ocimum basilicum and Ocimum gratissimum from Two Agro-Ecological Zones on Freshwater Smoke-Dried Oreochromis niloticus fish Sold in Some Local Markets in Cameroon

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Advances in Biological Chemistry 2023年第5期13卷 192-207页

作者： Tsi Celestine Angu Pride Ndasi Ngwasiri Lifoter Kenneth Navti Diane Youmbi Yimta Fonteh Florence Anyanwe Angaba Department of Biochemistry Faculty of Science The University of Bamenda Bamenda Cameroon Department of Nutrition Food and Bio-Resources Technology College of Technology The University of Bamenda Bamenda Cameroon Labouratory for Phytobiochemistry and Medicinal Plants Studies Yaounde Cameroon

Dried fish are susceptible to bacteria and fungi attack and are liable to chemical changes which cause losses in quality and reduction of shelf-life. It is important therefore to maintain the quality of fish because continuous consumption of contaminated fish and their products may predispose consumers to health hazards. Maintenance of high quality fish therefore calls for adequate and effective preservation techniques. The study examined the effectiveness of essential oils of Ocimum basilicum and Ocimum gratissimum from two Agro-ecological zones of Cameroon in limiting the microbial proliferation and preserving the quality of smoke-dried Oreochromis niloticus fish stored at 25˚C for two months. The plant materials were harvested from the Western Highlands and Monomodal Humid Forest agroecological zones of Cameroon. Extraction of the essential oil from the plants was done by hydro-distillation. The fish species (Oreochromis niloticus) used in this study was chosen based on a survey study on the most consumed species of freshwater smoke-dried fish in the Western Highlands and Monomodal Humid Forest Agro-ecological zones of Cameroon. Heterotrophic bacteria counts, fungi counts and Enterobacteriaceae counts were used to assess the level heterotrophic bacteria, fungi and Enterobacteriaceae respectively in the fish samples during storage and were done by culture techniques using total plate count agar, potato dextrose agar and violet red bile glucose agar respectively. Total volatile basic nitrogen, peroxide value, and thiobarbituric acid reactive substance assays were used as spoilage indices to assess the nutritional quality of the fish during storage. From the survey study, Oreochromis niloticus was the most consumed smoke-dried fish in the Western Highlands (35.45%) and Monomodal Humid Forest (34.55%) agroecological zones. All the EOs caused a significant reduction in the microbial loads, total volatile basic nitrogen, peroxide value, and thiobarbituric acid reactive

关键词： Oreochromis niloticus Essential Oils fish quality Ocimum basilicum Ocimum gratissimum Agro-Ecological Zone

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