Key Laboratory of Fishery Ecology and Environment

Laboratory of, China

Key Laboratory of Fishery Ecology and Environment

Laboratory of, China
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Gu Y.-G.,CAS South China Sea Fisheries Research Institute | Gu Y.-G.,Key laboratory of Fishery Ecology and Environment | Gu Y.-G.,Key Laboratory of Open Sea Fishery Development | Ouyang J.,Key laboratory of Fishery Ecology and Environment | And 4 more authors.
Marine Pollution Bulletin | Year: 2017

China is the world's largest mariculture producer. However, there is limited detailed information on organic matter distribution generated by mariculture in China. This study assessed the total organic carbon (TOC), total nitrogen (TN), and isotopic composition (δ13C and δ15N) in surface sediments from Zhelin Bay in South China. TOC, TN, δ13C and δ15N ranged from 0.46-1.23%, 0.08-0.20%, -22.07 to -21.13‰ and 5.28-7.14‰, respectively, and followed similar spatial patterns. The C/N ratio coupled with isotopic composition (δ13C and δ15N), indicates that the TOC originated from both terrestrial and marine sources. In general, surface sediments of Zhelin Bay were dominated by marine derived organic carbon; this form of carbon was separately calculated based on δ13C-based two end-member mixing and C/N ratio models. © 2017 Elsevier Ltd.


Du F.,Key Laboratory of Fishery Ecology and Environment | Wang L.,Key Laboratory of Fishery Ecology and Environment | Wang X.,Key Laboratory of Fishery Ecology and Environment | Gu Y.,Key Laboratory of Fishery Ecology and Environment | And 2 more authors.
Journal of Fisheries of China | Year: 2017

From May 21 to 23 and on May 27, 2014, during light falling net fishing operations in the central Nansha Islands waters, the samples of meso-And micro-zooplankton were collected and analyzed to investigate their changes before and after the light trap. The results showed that zooplankton were sensitive to artificial light at night; the community of zooplankton was affected by artificial nighttime light. A total of 178 zooplankton species belonging to 16 groups were recorded before and after the traps. The results show that the number of species increased after traps. The succession rate of species compositions was estimated at 41%, except Cladocera, all the 15 groups of zooplankton showed significant changes in species composition. Except for the Protozoa which showed a decline in species number, all groups showed a tendency of increased species number after traps. The results also indicated that most of the zooplankton species are sensitive to light traps, either positive or negative, and the occurring frequency of dominant species decreased obviously after light traps. The dominant species composition was changed after light traps (replacement rate was 50%). Before light traps, the Copepoda was the main dominant species. The dominant degree of Appendiculata was dramatically enhanced after light traps. The dominant species of meso-And micro-zooplankton in Nansha Islands trended towards cumulative distribution. All dominant species were sensitive to artificial light. The adaptation to light was different between species. Most dominant species had high adaptation to light; their aggregation intensity was enhanced after light traps, such as Oikopleuridae. The aggregation intensity of Farranula gibbula and Corycaeus agilis was reduced after light traps. At first, the aggregation intensity of Copepoda larvae and Acartia negligens was enhanced, but then the intensity was significantly reduced. Biomass and density of zooplankton were significantly increased in the overall trend, with the largest increase occurring during the initial trap, then declined, but still remaining higher than before the trap. As increase in nekton feeding intensity led to the fall of zooplankton. Although the species richness and diversity were significantly improved by the light trap, the structure of the zooplankton community did not change. Zooplankton species react to artificial light, and the difference between groups is determined by the biological and physiological characteristics of different feeding strategies. Artificial light pollution is a global environmental issue, the ecological impacts of which are only now beginning to be examined in detail. Current knowledge of these impacts in marine ecosystems is insufficient. Although the light trap increases production, but it is important to pay attention to and strengthen the ecological effects of science, and strictly limit the intensity of light trapping with appropriate restrictions on the development of light trap fisheries.


Qi Z.,Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization | Wang J.,Key Laboratory of Fishery Ecology and Environment | Wang J.,CAS South China Sea Fisheries Research Institute | Mao Y.,Chinese Academy of Fishery Sciences | And 2 more authors.
Journal of the World Aquaculture Society | Year: 2013

Feasibility of offshore co-culture of abalone and sea cucumber was investigated in Northern China. Survival and growth of abalone, Haliotis discus hannai Ino, and sea cucumber, Apostichopus japonicus, co-cultured in abalone cages from suspended longlines, in the offshore area, were examined. Abalone and sea cucumbers were co-cultured at density ratios of both 3:1 and 6:1 for 1yr. Abalone were fed with fresh kelp and no additional feed was given to sea cucumbers. Survival of abalone and sea cucumber was 100% for all treatments. Abalone and sea cucumber grew well; the body weight (BW) of abalone and sea cucumber was nearly doubled and had reached a commercial size. There were no significant differences in the growth rates for both abalone and sea cucumber between the two density treatments. The specific growth rate of BW of abalone (SGRbw) was highest in June, with a value of 0.536%/d. Growth rate of sea cucumber (SGRsc) was highest in December, reached 1.84%/d, with an annual average SGRsc of 0.182%/d. Results suggested that the offshore co-culture of abalone and sea cucumber was feasible offshore. The co-culture of abalone with sea cucumbers may provide an additional valuable crop without additional financial input. © Copyright by the World Aquaculture Society 2013.


Wang R.X.,CAS South China Sea Fisheries Research Institute | Wang R.X.,Key Laboratory of Fishery Ecology and Environment | Wang R.X.,South China Normal University | Wang A.,South China Normal University | And 2 more authors.
Ecotoxicology and Environmental Safety | Year: 2014

A total of 1,050 strains of heterotrophic bacteria isolated from farming seawater and the intestines of oyster species Crassostrea hongkongensis were tested for resistance to 10 antibiotics by the Kirby-Bauer diffusion method. The resistant rates of seawater-derived bacteria to chloramphenicol, enrofloxacin, and ciprofloxacin were low (less than 20%), whereas the bacteria obtained from oysters showed low resistance to chloramphenicol and enrofloxacin. Many strains showed high resistant rates (more than 40%) to furazolidone, penicillin G, and rifampin. A total of 285 strains from farming seawater and oysters were resistant to more than three antibiotics. Several strains showed resistance to more than nine antibiotics. Furthermore, the peak resistant rates of the seawater-derived strains to multiple antibiotics overlapped in April, June, September, and November, and those of oyster-derived strains overlapped during April, July, and September. The multi-resistant rate patterns of strains from farming seawater and oyster intestines were similar. © 2014 Elsevier Inc.


He H.,South China Agricultural University | Yu J.,Key Laboratory of Fishery Ecology and Environment | Chen G.,South China Agricultural University | Li W.,South China Agricultural University | And 2 more authors.
Ecotoxicology and Environmental Safety | Year: 2012

Both single and joint toxicity of atrazine and butachlor to freshwater green alga Scenedesmus obliquus and cladoceran Daphnia carinata isolated from South China were investigated in the present study. The 96h-EC 50 values of atrazine and butachlor to S. obliquus were 0.0147 and 2.31mgL -1, while the 48h-LC 50 values to D. carinata were 60.6 and 3.40mgL -1, respectively. These results suggest that atrazine could be highly toxic to S. obliquus and slightly toxic to D. carinata, while butachlor exhibits moderate toxicity to both organisms. The additive indexes of atrazine and butachlor mixtures were -2.68 (-3.02 to -2.32) to S. obliquus and 0.054 (-0.025 to 0.238) to D. carinata, respectively. Therefore, the joint action of two herbicides was significant antagonism to S. obliquus, while significant synergism was not shown to D. carinata. Moreover, significant linear correlation between the natural logarithm of herbicide concentrations and growth rates of alga S. obliquus was observed. Taken together, it is the first study reporting the toxicity endpoints for mixture of atrazine and butachlor against S. obliquus and D. carinata isolated from south China. The present results would be helpful to provide data to assess the ecological risk of both herbicides to aquatic organisms. © 2012 Elsevier Inc.


Wang R.X.,South China Normal University | Wang R.X.,CAS South China Sea Fisheries Research Institute | Wang R.X.,Key Laboratory of Fishery Ecology and Environment | Wang J.Y.,CAS South China Sea Fisheries Research Institute | And 4 more authors.
Marine Pollution Bulletin | Year: 2015

546 Vibrio isolates from rearing seawater (292 strains) and intestines of abalone (254 strains) were tested to ten antibiotics using Kirby-Bauer diffusion method. Resistant rates of abalone-derived Vibrio isolates to chloramphenicol (C), enrofloxacin (ENX) and norfloxacin (NOR) were <. 28%, whereas those from seawater showed large fluctuations in resistance to each of the tested antibiotics. Many strains showed higher resistant rates (>. 40%) to kanamycin (KNA), furazolidone (F), tetracycline (TE), gentamicin (GM) and rifampin (RA). 332 isolates from seawater (n. =. 258) and abalone (n. =. 74) were resistant to more than three antibiotics. Peaked resistant rates of seawater-derived isolates to multiple antibiotics were overlapped in May and August. Statistical analysis showed that pH had an important effect on resistant rates of abalone-derived Vibrio isolates to RA, NOR, and ENX. Salinity and dissolved oxygen were negatively correlated with resistant rates of seawater-derived Vibrio isolates to KNA, RA, and PG. © 2015 Elsevier Ltd.


Zhang L.,Chinese Academy of Sciences | Zhang L.,CAS Yantai Institute of Coastal Zone Research | Zhang L.,University of Chinese Academy of Sciences | Gan J.,Key Laboratory of Fishery Ecology and Environment | And 8 more authors.
Environmental Toxicology and Pharmacology | Year: 2012

With the objective to identify promising molecular biomarkers for marine pollution monitoring, a new cytochrome P450 gene was identified from Venerupis (Ruditapes) philippinarum and classified as a member of a new subfamily, CYP414A1. Phylogenetic analysis showed that CYP414A1 was closely related to members of the CYP2 family. CYP414A1 mRNA expression was significantly induced by 50μg/L B[. a]P at 96. h, while no significant change was found in 5μg/L B[. a]P-exposed samples. For heavy metals exposure, the expression of CYP414A1 was significantly up-regulated by Cd but sharply depressed by Cu exposure. These results suggested that CYP414A1 responded to various xenobiotics stresses, and could be used as a candidate biomarker of heavy metals and B[a]P. © 2011 Elsevier B.V.


Wang R.,CAS South China Sea Fisheries Research Institute | Wang R.,Key Laboratory of Fishery Ecology and Environment | Wang R.,Key Laboratory of Aquatic Products Processing | He J.,CAS South China Sea Fisheries Research Institute | And 2 more authors.
Journal of Shellfish Research | Year: 2016

Currently, the knowledge of ecology and function of bacteria harbored by molluscs is very limited. In this study, quantity and richness of culturable heterotrophic bacteria (CHB) in seawater of the farming environment and guts of the oyster Crassostrea hongkongensis were determined monthly, with classical, biochemical, and molecular methods. About 800 randomly selected bacterial strains were purified and identified.Quantities of CHB and vibrios, ranging from2.3×103 to 2.2×105 CFU/ml and 1.6×102 to 3.0×103 CFU/ml, respectively, were present in the farming seawater, whereas those in the oyster C. hongkongensis ranged from 5.3×104 to 5.4×106 CFU/g and 6.0×103 to 1.4×105 CFU/g, respectively. Vibrio spp., Pseudoalteromonas spp., Bacillus spp., and Shewanella spp. appeared almost every month. Richness of heterotrophic microbial communities of the seawater and the oysters was very similar and peaked in August. Variation in the diversity (Shannon index) of CHB in the seawater and in the oysters was similar, a significant positive correlation was showed between them (r = 0.894), and their diversities were both peaked in August. Statistical analysis showed that salinity hasmore important impact on quantity of CHB in seawater. Similarly, temperature hadmore important impact on that in the oysters. Important threshold data were analyzed to further explain the relationships.


Gu Y.-G.,CAS South China Sea Fisheries Research Institute | Gu Y.-G.,Key Laboratory of Fishery Ecology and Environment | Gu Y.-G.,Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization | Lin Q.,CAS South China Sea Fisheries Research Institute | And 4 more authors.
Marine Pollution Bulletin | Year: 2014

Surface sediments collected from Zhelin Bay, the largest mariculture base of eastern Guangdong Province, were analyzed for total metal concentrations and chemical speciation. The results demonstrated that the average total concentration (mg/kg) ranges were 36.7-65.8 (Pb), 53.8-98.8 (Cr), 39.0-87.1 (Ni), 50.9-144.5 (Cu), and 175.0-251.2 (Zn), which were clearly higher with respect to their corresponding benchmark values. The predominant speciation of Pb was reducible and comprised a residual fraction, whereas a major portion (57.6-95.4%) of Cr, Ni, Cu, and Zn was strongly associated with the residual fractions. Taking as a whole, surface sediments of Zhelin Bay had a 21% probability of toxicity based on the mean effects range-median quotient. © 2014 Elsevier Ltd.


PubMed | Key Laboratory of Fishery Ecology and Environment
Type: Journal Article | Journal: World journal of microbiology & biotechnology | Year: 2012

Four marine bacterial strains P1, P5, N5 and N21 were isolated from the surface water and sediment of Mirs Bay in southern Chinese coast using the liquid infection method with 48-well plates. These bacteria were all shown to have algicidal activities against Skeletonema costatum. Based on morphological observations, biochemical tests and homology comparisons by 16S rDNA sequences, the isolated strains P1, P5, N5 and N21 were identified as Halobacillus sp., Muricauda sp., Kangiella sp. and Roseivirga sp., respectively. Our results showed that bacterial strain P1 killed S. costatum by release of heat labile algicide, while strains P5, N5 and N21 killed them directly. The algicidal processes of four bacterial strains were different. Strains P1, N5 and N21 disrupted the chain structure and S. costatum appeared as single cells, in which the cellular components were aggregated and the individual cells were inflated and finally lysed, while strain P5 decomposed the algal chains directly. We also showed that the algicidal activities of the bacterial strains were concentration-dependent. More specifically, 10 % (v/v) of bacteria in algae showed the strongest algicidal activities, as all S. costatum cells were killed by strains N5 and N21 within 72 h and by strains P1 and P5 within 96 h. 5 % of bacteria in algae also showed significant algicidal activities, as all S. costatum were killed by strains N5, P5 and N21 within 72, 96 and 120 h, respectively, whereas at this concentration, only 73.4 % of S. costatum cells exposed to strain P1 were killed within 120 h. At the concentration of 1 % bacteria in algae, the number of S. costatum cells continued to increase and the growth rate of algae upon exposure to strain N5 was significantly inhibited.

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