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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. Source


Wang Z.,CAS South China Sea Fisheries Research Institute | Wang Z.,Key Laboratory of Fishery Ecology and Environment | Wang Z.,Key Laboratory of Aquatic Product Processing | Wang X.,CAS South China Sea Fisheries Research Institute | And 3 more authors.
Journal of Applied Phycology | Year: 2014

The macroalga Gracilaria lemaneiformis is an important and commercially valuable renewable resource. It is distributed widely in shallow marine waters but grows mostly on tropical or subtropical coasts. We investigated the accumulation of Cd, Cu, and Pb by live G. lemaneiformis under low concentrations. There was a positive correlation between the organisms' metal concentrations and exposure concentrations. When exposed to both Cu and Cd, the concentrations of Cu and Cd in G. lemaneiformis were higher than those exposed to solutions of Cu and Cd alone. However, the concentrations of heavy metals in G. lemaneiformis were not markedly different (p < 0.05) between the treatment groups and the control groups. We analyzed the results with nonlinear curve fitting and employed a two-compartment model to study the accumulation kinetics of heavy metals by G. lemaneiformis. The uptake rate constants and bioconcentration factors (BCFs) of the metals decreased with increased exposure concentration. The theoretical equilibrium concentrations increased significantly with the exposure concentrations. Our results suggested that G. lemaneiformis obviously accumulated heavy metals from seawater. As an important resource for food and pharmaceuticals, G. lemaneiformis should be cultivated in clear seawater. © 2013 Springer Science+Business Media Dordrecht. Source


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. Source


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. Source


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. Source

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