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Li Y.-F.,Shanghai Ocean University | Guo X.-P.,Shanghai Ocean University | Chen Y.-R.,Shanghai Ocean University | Ding D.-W.,State Oceanic Administration | And 3 more authors.
Journal of the Marine Biological Association of the United Kingdom | Year: 2016

Mussels are typical macrofouling organisms in the world. In this study, the interaction between the settlement of Mytilus coruscus plantigrades and bacterial community on coloured substrata was determined. Bacterial communities in biofilms developed on seven coloured substrata were analysed by Illumina Miseq sequencing. The mussel settlement response to coloured substrata with no biofilms was also examined. Flavobacteria, Alphaproteobacteria and Gammaproteobacteria were the first, second and third most dominant groups in seven biofilm samples. The results suggest that the inducing activities of these biofilms on plantigrade settlement varied with coloured substrata and the lowest percentage of settlement was observed on biofilms on the green substratum. High-throughput sequencing showed that bacterial community in biofilms also changed with the substratum colour. No significant difference in the inducing activity on plantigrade settlement was observed between the coloured substrata with no biofilms. Thus, difference in plantigrade settlement response may be correlated to the changes in bacterial community on coloured substrata. This finding extends current knowledge of interaction among mussel settlement and bacterial community variability. Copyright © Marine Biological Association of the United Kingdom 2016 Source

Yang J.-L.,State Oceanic Administration | Yang J.-L.,Shanghai Ocean University | Yang J.-L.,Collaborative Innovation Center for Zhejiang Marine High efficiency and Healthy Aquaculture | Li Y.-F.,Shanghai Ocean University | And 6 more authors.
Biofouling | Year: 2016

Abstract: This study investigated the effect of carbon nanotubes (CNTs) and titanium dioxide (TiO2) incorporated in PDMS on biofilm formation and plantigrade settlement of Mytilus coruscus. TiO2 increased bacterial density, and CNTs also increased bacterial density but reduced diatom density in biofilms after 28 days. Further analysis was conducted between bacterial communities on glass, PDMS, CNTs (0.5 wt%) and TiO2 (7.5 wt%). ANOSIM analysis revealed significant differences (R > 0.9) between seven, 14, 21 and 28 day-old bacterial communities. MiSeq sequencing showed that CNTs and TiO2 impacted the composition of 28 day-old bacterial communities by increasing the abundance of Proteobacteria and decreasing the abundance of Bacteroidetes. The maximum decreased settlement rate in 28 day-old biofilms on CNTs and TiO2 was > 50% in comparison to those on glass and PDMS. Thus, CNTs and TiO2 incorporated in PDMS altered the biomass and community composition of biofilms, and subsequently decreased mussel settlement. © 2016 Informa UK Limited, trading as Taylor & Francis Group. Source

Ding L.,Ningbo University | Ding L.,Jinan University | He S.,Ningbo University | He S.,Collaborative Innovation Center for Zhejiang Marine High efficiency and Healthy Aquaculture | And 7 more authors.
Molecules | Year: 2015

5-Hydroxytryptamine type 2A (5-HT2A) receptor is an important target for developing innovative antipsychotic agents in neuropsychiatric disorder therapies. To search for 5-HT2A receptor antagonists, a new indole alkaloid termed 6-bromo-N-propionyltryptamine (1), together with one known homologue 6-bromo-N-acetyltryptamine (2) were isolated and identified from a marine bacterium Pseudoalteromonas rubra QD1-2. Compound 1 with an N-propionyl side chain exhibited stronger 5-HT2A receptor antagonist activity than that of N-acetyl derivative (2), indicating that 6-bromotryptamine analogues with a longer chain acyl group perhaps displayed a more potent capacity to the target. Therefore, a series of new 6-bromotryptamine analogues (3-7) with different chain length of the acyl group (C4-C8) were prepared and evaluated activity against 5-HT2A receptor. Remarkably, 6-bromo-Nhexanoyltryptamine (5) displayed the most effective inhibitory activity, which was 5-fold stronger than that of the parent compound 1 and showed 70% efficacy of the positive control (ketanserin tartrate). © 2015 by the authors; licensee MDPI, Basel, Switzerland. Source

Chen H.,Post University | Chen H.,Collaborative Innovation Center for Zhejiang Marine High efficiency and Healthy Aquaculture | Jian Q.,Post University | Luo Q.,Post University | And 3 more authors.
Journal of Applied Phycology | Year: 2015

Oligosaccharides can elicit a defense-related response in marine algae or seaweeds. This study aimed to investigate the possible application of oligosaccharides as biological elicitors for algal farming by measuring their antirotting effects on Pyropia haitanensis. The concentration of oligoagars and the time of treatment were optimized by examining their effects on the percentage of rotting in thalli. Oxidative burst and expression of defense-related genes were examined. The optimized conditions obtained were then applied in an aquaculture setting for P. haitanensis. Elicitation with oligoagars at 100 μg mL−1 for 2 h produced the optimal rot resistance effect, and oligoagars delayed the severe rotting of thalli by more than 13 days. Oligoagars elicited rapid respiration in thalli. The expression levels of Phrboh and Phhsp70 genes were up-regulated whereas Phsod was down-regulated. During aquaculture, treatment with oligoagars when thalli were 30 days old and when conchospores adhered to nets improved growth, increased yield of products, and delayed the maturation of thalli. However, treatment when conchospores adhered to nets had better results and was more convenient and practical. Overall, we found that oligoagars have potential applications as elicitors for biological farming and can be applied in the aquaculture of P. haitanensis with promising results. © 2015 Springer Science+Business Media Dordrecht Source

Wang S.-H.,Jimei University | Wang S.-H.,Collaborative Innovation Center for Zhejiang Marine High efficiency and Healthy Aquaculture | Hong W.-T.,Jimei University | Chen J.-X.,Xiamen University | And 6 more authors.
Chinese Journal of Applied Ecology | Year: 2015

The natural coral reef resources degrade rapidly because of climate change, environmental pollution and exploitation of aquarium species. Artificial propagation is an effective way to facilitate the reduction of wild harvesting, reef restoration, preservation of biodiversity. This paper reviewed the technique and research progresses focused on coral artificial propagation. We compared the advantages and disadvantages of sexual reproduction and asexual reproduction as well as in situ and ex situ propagation. Moreover, we summarized the important roles of irradiation, flow rate, nutrients, feed and other factors in coral propagation within recirculating aquaculture system (RAS). Irradiation is the key to successful ex situ coral culture and different species show different needs of radiation intensity and light spectrum. Therefore, artificial lighting in RAS, as well as power and maintenance costs, are very important for ex situ coral aquaculture. In addition, corals are very sensitive to NH4 +, NO3 -, NO2 - as well as phosphate in RAS, and many physical, chemical and biological methods are acquired to maintain low nutrients condition. Although RAS has progressed a lot in terms of irradiation, flow rate and nutrient control, future studies also should focus on sexual reproduction, genetic modification and disease control. ©, 2015, Editorial Board of Chinese Journal of Applied Ecology. All right reserved. Source

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