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Journal of Oceanology and Limnology - A mass mortality often occurs from molting to the megalopa stage during the larval development of the swimming crab Portunus trituberculatus. Larvae with... 相似文献
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A mass mortality often occurs from molting to the megalopa stage during the larval development of the swimming crab Portunus trituberculatus. Larvae with insuffcient nutrient accumulation during the zoeal stages are probably unable to develop into juvenile swimming crabs. However, the nutritional information such as the primary metabolites is scarce for P. trituberculatus larvae. The aim of this work is to obtain an insight into the metabolite traits of P. trituberculatus at early developmental stages. 1 H nuclear magnetic resonance spectroscopy coupled with multivariate data analysis was used to determine how the metabolite pro?les shift during larval development in P. trituberculatus. Our results show that the trend of total metabolites exhibited a rise from zoea 1 to zoea 3, followed by a drop from zoea 4 to megalopa and recovery during the ?rst juvenile stage. A large-scale depletion of total metabolites in the zoea 4 and megalopa stages suggests a deep depression of metabolic activity, which may be linked to the mass mortality from molting to the megalopa stage. These ?ndings provided essential metabolic information about the larval development of P. trituberculatus and important clues for understanding the nutritional requirements of P. trituberculatus in early developmental stages. 相似文献
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Phospholipids are used to improve the growth and survival of Portunus trituberculatus,a widely cultured crab species in China.However,only total phospholipids or several classes are applied in crab diets.In this study,we employed a targeted lipidomic method to investigate the comprehensive phospholipid composition in P.trituberculatus larvae and reveal the changing phospholipid profile over the larval development.Results showed that P.trituberculatus larvae contain 112 phospholipid species belonging to 10 phospholipid classes,in which phosphatidylcholine(PC)and phosphatidylethanolamine(PE)species are the most abundant,and PC,PE,phosphatidic acid,and phosphatidylserine(PS)are with high concentrations.The levels of all phospholipids significantly changed with larval development,which was highlighted by the downward parabolic changes in PE,phosphatidylglycerol,phosphatidylino-sitol,PS,lysophosphatidic acid,and sphingomyelin levels.In addition,nearly all phospholipid species were depleted at the M stage,which probably contributed to the mass mortality of crab larvae.These findings on the composition and alterations of phospholipids in P.trituberculatus larvae provide novel perspectives for the targeted supplementation of phospholipids in crab diets.Our work also highlights the use of targeted UHPLC-MS lipidomics in understanding the changes of phospholipids during crab development. 相似文献
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JI Zilu LI Ronghua WANG Chunlin ZHANG Zhouyi ZHANG Weijia MU Changkao SONG Weiwei 《中国海洋大学学报(英文版)》2022,21(1):179-185
This study investigated the effects of long-term low-salinity on the growth performance,proximate composition,amino acid and fatty acid profiles of Scylla paramamosain.The salinity of the low-salinity-culture group(LC)and maintained-salinity-cul-ture group(MC)were set at 5 and 25 respectively.After rearing for 30 d,the survival rate(SR)of the LC group was significantly lower,whereas the average daily molting frequency(ADMF)was significantly higher than those in MC group(P<0.05).There were no significant difference for weight gain rate(WGR)and specific growth rate(SGR)between the two groups.The moisture content of the LC group was slightly higher than the MC group without significant difference.The contents of ash,crude lipid and crude pro-tein in the LC group were lower than those in the MC group,but no significant differences were found except for ash content.A total of 17 free amino acids and 23 fatty acids were identified from the muscle of S.paramamosain.The total amino acids(TAA),essen-tial amino acids(EAA)and essential amino acid index(EAAI)had no significant difference between the two groups.The crabs from LC group had a significantly higher HUFA,including EPA,DHA,ARA.The percentage of n-3 PUFA and the ratio of n-3/n-6 PUFA were significantly higher in the LC group.These results indicated that S.paramamosain rearing at low salinity had significantly de-creased SR;however,the low-salinity environment significantly promoted the accumulation of unsaturated fatty acids(UFAs),espe-cially the n-3 PUFA,which might be related to the osmoregulation mechanism. 相似文献
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We established a line (screened) of Portunus trituberculatus by selectively breeding individuals that survived from challenge with Vibrio alginolyticus, and compared the response of screened and unscreened (control) P. trituberculatus challenged with V. alginolyticus. We measured superoxide dismutase, catalase, acid phosphatase, alkaline phosphatase, and peroxidase activity and the content of hemocyanin in the plasma and phenoloxidase activity in serum. The cumulative survival rate after 24-h challenge with V. alginolyticus was significantly higher in the screened crabs than in the unscreened crabs (P<0.05). T-SOD and PO activity were significantly lower in the screened stock than in the unscreened stock (P<0.05). POD, CAT, and ACP activity and hemocyanin content were significantly higher in the screened stock than in the unscreened stock. Our results suggest that the screened stock was more resistant to infection. Furthermore, the indices we measured may be used to evaluate the health state of P. trituberculatus. 相似文献
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LU Shaokun LI Ronghua GAO Tianlong WANG Chunlin ZHENG Weibing MU Changkao SONG Weiwei 《中国海洋大学学报(英文版)》2019,(5)
In this study, the methylation-sensitive amplification polymorphism(MSAP) was used to compare the genomic DNA methylation level of muscle, gill and hepatopancreas of Portunus trituberculatus subjected to salinity 12 for 30 days to illustrate the epigenetic mechanism of osmoregulation. Thirty primers were used to analyze the difference of methylation level of different tissues. The results showed that the baseline methylation level of muscle, hepatopancreas and gill was 47.31%, 22.94% and 17.69%, respectively. After exposed to low salinity stress, the methylation epiloci changed in the three tissues. Both demethylation and methylation processes occurred under low salinity stress. The methylation ratio decreased in muscle and gill but increased in hepatopancreas. These results indicated that DNA methylation is tissue-specific when P. trituberculatus responds to low salinity. 相似文献
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以克氏原螯虾为材料,采用聚丙烯酰胺凝胶电泳方法,分析了肌肉、眼球、肝胰腺和心脏4种组织和器官中乳酸脱氢酶(LDH)同工酶的表达情况.结果发现,眼球中出现Ldh-5和Ldh-6 2条酶带,肌肉中出现Ldh-1、Ldh-2、Ldh-3、Ldh-4、Ldh-5共5条酶带,肝胰腺中只出现Ldh-6 1条酶带,心脏中出现Ldh-3和Ldh-5共2条带.在这些检测到的酶带中,肌肉中Ldh-5活性最强,染色最深.实验结果表明,不同组织中LDH的同工酶的表达存在差异,表现出明显的组织特异性. 相似文献
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QIU Xueni ZHOU Qiongyan ZHU Xiaoxia LIN Wei MU Changkao LI Ronghua YE Yangfang SONG Weiwei SHI Ce LIU Lei WANG Huan WANG Chunlin XU Suling 《中国海洋大学学报(英文版)》2022,21(2):421-429
Crustacean is one of the major allergic foods.It is of great significance to identify more crab allergens and research the detection methods for crab food anaphylaxis.In this study,IgE reactivity to three recombinant proteins from Portunus trituberculatus,including tropomyosin(rPtTM),myosin light chain(rPtMLC),and pancreatic lipase(rPtPL),were detected by enzyme-linked im-munosorbent assay(ELISA).The expressions of tropomyosin(TM)in various tissues of P.trituberculatus were detected by Western blot(WB).Furthermore,microplates were coated with rPtTM and the ELISA conditions were optimized.The cut-off value was deter-mined by the receiver operating characteristic(ROC)curve.Among 51 crab-allergic sera,21(41.2%)showed positive IgE to rPtTM.Other 70 crab-allergic sera more frequently recognized rPtPL(9/70;12.9%),followed by rPtMLC(1/70;1.4%).WB results showed that TM was mainly expressed in the muscle,followed by the heart and a small amount in gills and the testis.The optimal results showed that the coating condition of rPtTM was 50 ng per well with coating for 3 h at 37℃.The optimal blocking condition was 1.2%BSA with blocking for 3 h at 37℃,and the optimal dilution of the second antibody was 1:1500.The ROC curve showed that the ELISA reagent had high sensitivity(83.52%)and specificity(98.00%)when the cut-off value was 0.45.All results indicated that tropomyosin is the major allergen of P.trituberculatus,and myosin light chain and pancreatic lipase are the potential allergens.Addi-tionally,the ELISA reagent developed with the rPtTM was feasible for laboratory detection of crab anaphylaxis. 相似文献