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Effects of dietary tert-butylhydroquinone on domoic acid metabolism and transcription of detoxification-related liver genes in red sea bream Pagrus major

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Chinese Science Bulletin 2013年第16期58卷 1906-1911页

作者： HE Shan LIANG XuFang SHEN Dan ZHANG WenBing mai kangsen Key Laboratory of Freshwater Animal Breeding of Ministry of Agriculture College of Fisheries Huazhong Agricultural University Key Laboratory of Mariculture of Ministry of Education Ocean University of China

Domoic acid (DA) is a neuroexcitatory amino acid that is produced by Pseudo-nitzschia during harmful algal blooms (HAB). Accumulation of DA can be transferred through food chain and cause neuronal damage in marine animal and in human. Like other algal toxins, DA was suggested to increase the oxidative stress and increase the detoxification-related gene expression in fish. The widely used food antioxidant, tert-butylhydroquinone (tBHQ), was known to induce a wide range of antioxidative potentials such as elevation of the glutathione levels and glutathione S-transferases (GSTs), via the activation of antioxidant response elements (AREs). In this study, the influences of dietary tBHQ on domoic acid (DA) metabolism and detoxification-related gene transcription were investigated both in vivo and in vitro. Oral administration of tBHQ resulted in significant decreases of DA accumulation of liver tissues in which red sea bream were fed with a single dose of 10 mg DA and 100 mg tBHQ per kg body weight per fish. Real-time PCR further revealed that the mRNA levels of AHR/ARNT/CYP1A1/GSTA1/GSTR were up-regulated in the above liver tissues at 72 h post tBHQ treatment. In consistence, tBHQ exposure also resulted in increased mRNA transcription of GSTA1, GSTA2 and GSTR in cultured red sea bream hepatocytes. Collectively, our findings in this research suggested that the dietary intake of tBHQ accelerated DA metabolism in fish, through mechanisms involving altered transcription of detoxification- related liver genes.

关键词： mRNA转录相关基因软骨藻酸特丁基对苯二酚酸代谢真鲷解毒肝脏

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Comparative study on the organoleptic quality of wild and farmed large yellow croaker Larimichthys crocea

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Journal of Oceanology and Limnology 2020年第1期38卷 260-274页

作者： MA Rui MENG Yuqiong ZHANG Wenbing mai kangsen Key Laboratory of Aquaculture Nutrition and Feed(Ministry of Agriculture)&Key Laboratory of Mariculture(Ministry of Education) Ocean University of ChinaQingdao 266003China State Key Laboratory of Plateau Ecology and Agriculture Qinghai UniversityXining 810016China Laboratory for Marine Fisheries Science and Food Production Processes Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China

To fill the blank in systematic study on the organoleptic quality of large yellow croaker Larimichthys crocea,we analyzed the organoleptic quality of the fish meat of wild,trash-fish-fed,and compound-feed-fed large yellow *** fish(weight:500 g)per group were sampled in the same period,and 89 indices of fish organoleptic quality were measured and *** reveal significant differences in the body condition factor,skin/muscle color,flesh texture,odor,and taste aspects between wild and farmed *** with the wild fish,farmed fish showed fatter body shape,whiter skin or muscle color,tender muscle,higher level of fishy odor or volatile intensity,but lower delicious *** addition,compared with trash-fish feeding,compound-feed feeding could improve the body shape,skin color,flesh texture,and fish taste of large yellow croaker,but it also increased the fishy *** principle component analysis and cluster analysis,the present study preliminarily established the systematic evaluation with multiple indices to the quality of large yellow *** shall be helpful for the evaluation or improvement of the quality of farmed large yellow croaker.

关键词： large yellow croaker appearance texture odor taste

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Comparative Study on the Leaching Dynamic Properties of Five Kinds of Microparticulate forms of Vitamin B_1

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High Technology Letters 2001年第2期7卷 1-5页

作者：吴格天 mai kangsen Zhu Wei Aquaculture Research Laboratory College of Fisheries Ocean University of Qingdao

With an aim to reduce leaching of water soluble vitamins, the leaching properties of five kinds of microparticulate forms of vitamin B 1 are investigated by means of dynamic system. These microparticles include: alginate and alginate CMC microcapsules prepared by emulsion coacervation process (ECP), alginate and gelatin microcapsules prepared by spray drying process (SDP), and alginate microbound. The results show these five microparticulate forms of VB 1 can reduce leaching significantly compared to crystalline form VB 1, and the leaching rates at different intervals, diameters and encapsulation efficiencies ( EE ) are significantly different among all kinds of microparticles (ANOVA, P <0.05). The leaching properties of the five microparticles are in accord with Higuchi equation. Based on the regression equation, the half loss time ( T 50 ) is *** conclusion, the alginate CMC microencapsule is a potential tool to reduce leaching of water soluble vitamins.

关键词： Leaching Microencapsulation Microbound Vitamin B 1

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Recent progress in the understanding of the gut microbiota of marine fishes

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Marine Life Science & Technology 2021年第4期3卷 434-448页

作者： Weihao Ou Guijuan Yu Yanjiao Zhang kangsen mai The Key Laboratory of Aquaculture Nutrition and Feed(Ministry of Agriculture)and the Key Laboratory of Mariculture(Ministry of Education) Ocean University of ChinaQingdao 266003China Laboratory for Marine Fisheries Science and Food Production Processes Pilot National Laboratory for Marine Science and TechnologyQingdao 266237China

As the significance of the gut microbiota has become increasingly realized,a large number of related studies have *** respect to the gut microbial composition of fish,the predominant gut microbes and core gut microbiota have been reported by many *** understanding of fish gut microbiota,especially its functional roles,has fallen far behind that of terrestrial vertebrates,although previous studies using gnotobiotic zebrafish models have revealed that the gut microbiota performs a significant role in gut development,nutrient metabolism and immune *** that environmental factors of marine habitats are very different from those of freshwater habitats,a distinct difference may exist in the gut microbiota between freshwater and marine ***,this review aims to address the advances in marine fish gut microbiota in terms of methodologies,the gut microbial composition,and gnotobiotic models of marine fish,the important factors(host genotype and three environmental factors:temperature,salinity and diet)that drive marine fish gut microbiota,and significant roles of the gut microbiota in marine fish.

关键词： Marine fish Gut microbiota Gnotobiotic Influence factors Gut microbial functions

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Supplementation of Yeast Extract to Practical Diet Improves the Growth, Anti-Oxidative Capacity and Intestinal Morphology of Shrimp Litopenaeus vannamei

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Journal of Ocean University of China 2019年第4期18卷 933-938页

作者： MA Shuoli WANG Xiaoxia GAO Weihua ZHANG Wenbing mai kangsen The Key Laboratory of Aquaculture Nutrition and Feeds of Ministry of Agriculture and the Key Laboratory of Mariculture of Ministry of EducationOcean University of ChinaQingdao 266003China Department of Fisheries College of Animal ScienceYangtze UniversityJingzhou 434024China Laboratory for Marine Fisheries Science and Food Production Processes Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China

Two control diets based on the commercial formula were designed to contain high(27%,D1)and low(22%,D2)levels of fish meal,*** D2,500,1000 and 1500 mg kg 1 of yeast extract were added,respectively,yielding three experimental diets(YE1 through YE3).Shrimp(initial body weight 0.30 g±0.02 g)were fed with the experimental diets,five tanks each diet and 30 shrimp individuals each tank,for 8 weeks,and then challenged with Vibrio *** results showed that the specific growth rate(SGR)of shrimp in D2 was significantly lower than that of shrimp in D1(P0.05).YE significantly improved the activity of glutathione *** concentration of glutathione(GSH)and the total serum anti-oxidative capacity(T-AOC)of D1 were significantly higher than those of shrimp feeding other diets(P0.05).In conclusion,1000 1500 mg kg 1 of YE was suggested to be supplemented into the practical diets to improve the growth,anti-oxidative capacity and intestinal mor-phology of shrimp ***.

关键词： yeast extract shrimp growth anti-oxidative capacity intestinal morphology

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Dietary Leucine Requirement of Juvenile Japanese Seabass(Lateolabrax Japonicus)

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Journal of Ocean University of China 2015年第1期14卷 121-126页

作者： LI Yan CHENG Zhenyan mai kangsen AI Qinghui The Key Laboratory of Mariculture (Ministry of Education of China) Ocean University of China

A 56-day feeding trial was conducted to examine the dietary leucine requirement of juvenile Japanese seabass in sea- water floating net cages （1.5 m × 1.5 m × 2.0 m）. Six isonitrogenous （crude protein 40%） and isoenergetic （gross energy 20 kJ g-1） diets were formulated to contain different concentrations of leucine （0.9%, 1.49%, 2.07%, 2.70%, 3.30% and 3.88% of dry matter）. Crys- talline L-amino acids were supplemented to simulate the whole body amino acid pattern of Japanese seabass except for leucine. Three groups （30 fish individuals each, 8.0g±0.20g in initial weight） were fed to apparent satiation at 5：00 and 17：30 every day. During the experimental period, the water temperature ranged from 26 to 32℃ and salinity from 26 to 30, and the dissolved oxygen was maintained at 7mgL-l. The results showed that weight gain （WG）, nitrogen retention （NR）, feed efficiency （FE） and protein efficiency ratio （PER） were significantly increased when dietary leucine was increased from 0.90% to 2.70% of dry matter, and then declined. WG was the highest when fish were fed D4 containing 2.70% of leucine. No significant differences were observed in body composition among dietary treatments （P 〉 0.05）. Considering the change of WG, the optimum dietary leucine requirement of juve- nile Japanese seabass was either 2.39% of dry matter or 5.68% of dietary protein.

关键词： growth leucine requirement Japanese seabass

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Effects of Dietary Carbohydrate-to-Lipid Ratio on the Growth Performance and Feed Utilization of Juvenile Turbot(Scophthalmus maximus)

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Journal of Ocean University of China 2016年第4期15卷 660-666页

作者： MIAO Shuyan NIE Qin MIAO Huijun ZHANG Wenbing mai kangsen The Key Laboratory of Aquaculture Nutrition and Feed of Ministry of Agriculture The Key Laboratoryof Mariculture of Ministry of Education Ocean University of China Qingdao 266003 P. R. China College of Animal Science and Technology Yangzhou University Yangzhou 225009 P. R. China

A 9-week feeding trial was conducted to investigate the effects of dietary carbohydrate to lipid ratio(CHO:LIP) on the growth performance and feed utilization of juvenile turbot Scophthalmus maximus(initial body weight 8.75 g ± 0.04 g). Four isonitrogenous and isoenergetic low protein level(39%) diets were formulated with increasing ratios of dietary carbohydrate to lipid(2:18, 6:18, 18:12 and 28:6). A high protein level(50%) diet with the 2:12 ratio of carbohydrate to lipid was used as the control. Results showed that the survival rate, contents of moisture, crude protein and ash in muscle were not significantly affected by dietary treatments. With the dietary CHO:LIP ratio increased from 2:18 to 18:12, weight gain rate significantly increased(P < 0.05). Higher dietary CHO:LIP ratio(28:6) resulted in the significantly decreased weight gain rate(P < 0.05). Meanwhile, this treatment also resulted in the highest daily feed intake and liver glycogen content, as well as the lowest feed efficiency(P < 0.05). Muscle glycogen content in fish fed the diet with 2:12 or 2:18 CHO:LIP ratio was significantly lower than those fed with the other three diets(P < 0.05). The present results confirmed that the juvenile turbot can utilize carbohydrate. Furthermore, the appropriate ratio of dietary carbohydrate to lipid was important to the growth and feed utilization of turbot. The proper CHO:LIP ratio based on the growth performance in the present study was determined to be 18:12 when the dietary protein level was 39%.

关键词： Scophthalmus juvenile Lipid carbohydrate dietary glycogen dextrin lipid Paralichthys intake

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Dietary Protein Requirement of Juvenile Turbot(Scophthalmus maximus Linnaeus)

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Journal of Ocean University of China 2015年第2期14卷 325-328页

作者： LIU Xingwang mai kangsen LIUFU Zhiguo AI Qinghui Key Laboratory of Nutrition and Feed of Department of Agriculture of China Ocean University of China Guangdong Evergreen Feed Industrial Co. Ltd.

The dietary protein requirement of juvenile turbot(initial average weight, 38.2 g ± 0.1 g) reared indoor in aerated aquaria was determined in this study. Five energy equal experimental diets were formulated with fish meal as protein source, which contained different concentrations of protein(47.2%, 51.0%, 54.6%, 59.3% and 63.6% of dry diet). Three groups of fish with 18 individuals in each, were cultured in 300-L tanks and fed twice a day for 8 weeks. During culture, temperature was controlled between 15.0 and 18.0℃, salinity was controlled between 28.5 and 32.0, acidity was controlled between p H7.8 and p H8.5, and ammonia nitrogen was maintained below 0.03 mg L-1 and dissolved oxygen was maintained about 7 mg L-1. Results showed that the growth of fish was significantly affected by dietary protein content(P 0.05). Broken-line regression analysis of SGR showed that the optimal dietary protein requirement of turbot was about 57.0%.

关键词： turbot Scophthalmus maximus protein requirement feed nutrition

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Isolation and Identification of a Bacterium from Marine Shrimp Digestive Tract:A New Degrader of Starch and Protein

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Journal of Ocean University of China 2011年第3期10卷 287-292页

作者： LI Jiqiu TAN Beiping mai kangsen The Key Laboratory of Mariculture Ministry Education of China Fisheries College Ocean University of China Qingdao 266003 P. R. China College of Life Science South China Normal University Guangzhou 510631 P. R. China Fisheries College Guangdong Ocean University Zhanjiang 524025P. R. China

It is a practical approach to select candidate probiotic bacterial stains on the basis of their special traits. Production of digestive enzyme was used as a trait to select a candidate probiotic bacterial strain in this study. In order to select a bacterium with the ability to degrade both starch and protein, an ideal bacterial strain STE was isolated from marine shrimp (Litopenaeus vannamei) intestines by using multiple selective *** selected isolate STE was identified on the basis of its morphological, physiological,and biochemical characteristics as well as molecular analyses. Results of degradation experiments confirmed the ability of the selected isolate to degrade both starch and casein. The isolate STE was aerobic, Gram-negative, rod-shaped, motile and non-spore-forming, and had catalase and oxidase activities but no glucose fermentation activity. Among the tested carbon/nitrogen sources, only Tween40, alanyl-glycine, aspartyl-glycine, and glycyl-l-glutamic acid were utilized by the isolate STE. Results of homology comparison analyses of the 16S rDNA sequences showed that the isolate STE had a high similarity to several Pseudoalteromonas species and, in the phylogenetic tree, grouped with P. ruthenica with maximum bootstrap support (100%). In conclusion, the isolate STE was characterized as a novel strain belonging to the genus *** study provides a further example of a probiotic bacterial strain with specific characteristics isolated from the host gastrointestinal tract.

关键词： candidate probiotic selection identification marine shrimp

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Palatability of Water-Soluble Extracts of Protein Sources and Replacement of Fishmeal by a Selected Mixture of Protein Sources for Juvenile Turbot(Scophthalmus maximus)

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Journal of Ocean University of China 2016年第3期15卷 561-567页

作者： DONG Chun HE Gen mai kangsen ZHOU Huihui XU Wei Key Laboratory of Water Project Ecological Effect and Ecological Restoration Institute of HydroecologyMinistry of Water Resources and Chinese Academy of Sciences Key Laboratory of Aquaculture Feed and Nutrition of Ministry of Agriculture Ocean University of China

Poor palatability is a limiting factor for replacing fishmeal with other protein sources in aquaculture. The water-soluble molecules with low molecular weights are the major determinants of the palatability of diets. The present study was conducted to investigate the palatability of water-soluble extracts from single protein source(single extract pellets) and the mixture of these extracts with different proportions(blended extract pellets) in juvenile turbot(Scophthalmus maximus). Then according to the palatability of blended extract pellets, an optimal mixture proportion was selected, and a new protein source made from raw protein materials with the selected proportion was formulated to replace fishmeal. Summarily, the palatability of single extract pellets for turbot was descendent from fishmeal to pet-food grade poultry by-product meal, wheat gluten meal, soybean meal, peanut meal, meat and bone meal, and corn gluten meal. Subsequently, according to the palatability of single extract pellets, 52 kinds of blended extract pellets were designed to test their palatability. The results showed that the pellets presented remarkably different palatability, and the optimal one was diet 52(wheat gluten meal: pet-food grade poultry by-product meal: meat and bone meal: corn gluten meal = 1:6:1:2). The highest ingestion ratio(the number of pellets ingested/the number of pellets fed) was 0.73 ± 0.03, which was observed in Diet 52. Then five isonitrogenous(52% crude protein) and isocaloric(20 k J g^(-1) gross energy) diets were formulated by replacing 0(control), 35%, 50%, 65% and 80% of fishmeal with No.52 blending proportion. After a 10-weeks feeding trial, a consistent feed intake was found among all replacement treatments. Replacement level of fishmeal up to 35% did not significantly influence final body weight, specific growth rate, feed efficiency ratio, and protein efficiency ratio of turbot. Therefore, the water-soluble extracts of protein sources play an important role

关键词： protein source water-soluble extract palatability fishmeal replacement turbot

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