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Wu X.-Y.,Jinan University | Wu X.-Y.,Key Laboratory of Eutrophication and Red Tide Control | Yang Y.-F.,Jinan University | Yang Y.-F.,Key Laboratory of Eutrophication and Red Tide Control
Aquaculture Research

This paper compares and discusses the accumulation of eight heavy metals (Cd, Co, Cr, Cu, Pb, Fe, Mn and Zn) and total phosphorus (TP) in surface sediments from five intensive farms of tilapia Oreochromis niloticus × Oreochromis aureu, Asian seabass Lates calcarifer and white shrimp Litopenaeus vannamei (n=75). Results indicate that the sediments were significantly contaminated by Cd, Co, Cr, Cu, Pb, Fe, Mn and Zn as well as P. The mean concentrations of Cd (0.47 mg kg-1), Co (2.25 mg kg-1), Cu (31.56 mg kg-1), Pb (23.45 mg kg-1), Fe (1.15%), Mn (145.5 mg kg-1), Zn (41.5 mg kg-1) and TP (750.69 mg kg-1) in tilapia farm surface sediments were significantly lower than the levels observed in Asian seabass and white shrimp farm surface sediments, where the concentrations were, respectively, Cd - 2.69 and 2.35 mg kg-1, Co - 17.66 and 15.22 mg kg-1, Cu - 116.84 and 110.03 mg kg-1, Pb - 38.5 and 33.26 mg kg-1, Fe - 3.4% and 3.31%, Mn - 853.61 and 728.5 mg kg-1, Zn - 105.21 and 83.92 mg kg-1 and TP - 1445.63 and 1069.8 mg kg-1. The heavy metal content of the sediments follow the order: Asian sea bass>white shrimp>tilapia. Cadmium and Cu in Asian seabass and white shrimp farm sediments would pose a major potential risk. Further, the sediment is highly enriched by Fe, P, Mn and Co. © 2009 The Authors. Journal Compilation © 2009 Blackwell Publishing Ltd. Source

Wu X.-Y.,Jinan University | Wu X.-Y.,Key Laboratory of Eutrophication and Red Tide Control | Yang Y.-F.,Jinan University | Yang Y.-F.,Key Laboratory of Eutrophication and Red Tide Control
Journal of Food Composition and Analysis

The present research project was undertaken to determine heavy metal (Pb, Co, Cd, Cr, Cu, Fe, Mn and Zn) concentrations in intensive aquaculture and wild white shrimp tissues (muscle, shell and liver), and to inform aquatic shrimp food safety. The aquaculture samples were obtained from ten intensive farms and wild animals from one station in Zhanjiang Harbour Bay. Heavy metal concentrations (mgkg-1, dry weight; means±S.D.) in aquaculture white shrimp muscle, shell and liver tissues were, respectively: Cr - 20.86±5.27, 28.70±8.34 and 18.91±5.50, Cu - 24.26±8.36, 30.86±9.84 and 126.42±90.9, Fe - 61.35±30.76, 55.07±17.72 and 124.04±56.15, Mn - 5.33±2.5, 10.72±4.34 and 8.79±5.29, Zn - 171.56±118.74, 51.84±10.94 and 111.74±84.67. Cadmium was observed only in liver tissue at 3.30±1.29mgkg-1. Lead could not be detected, and cobalt was detected only in wild shrimp liver tissue. Chromium and manganese mean concentrations in shell tissue were significantly higher than levels in muscle tissue (P<0.05), but the zinc mean concentration was significantly lower than noted in muscle tissue (P<0.05). Copper and iron mean concentrations in liver tissue were significantly higher than those in muscle or shell tissues (P<0.05). Overall, only chromium in white shrimp tissue was the primary risk for human health. © 2010 Elsevier Inc. Source

Yang Y.,Jinan University | Yang Y.,Key Laboratory of Eutrophication and Red Tide Control | Liu Q.,Jinan University | Liu Q.,Key Laboratory of Eutrophication and Red Tide Control | And 4 more authors.
Journal of Applied Phycology

While harmful algal blooms (HABs) have become a threat to fisheries, environmental and public health, and economies worldwide, most of the approaches under investigations for prevention, control, and mitigation (PCM) of HABs are limited by high cost and possible secondary pollution. This study reports our laboratory and field experiments demonstrating effective growth-inhibiting effects of the widely cultivated seaweed Gracilaria lemaneiformis on phytoplankton possibly forming HABs. Laboratory experiments demonstrated significant growth-inhibiting effects of fresh G. lemaneiformis thalli in a dose-response manner on four of six test microalgae commonly observed in the seaweed cultivation area (Scrippsiella trochoidea, Prorocentrum micans, Skeletonema costatum, Dunaliella salina) and on the natural phytoplankton assemblage in seawater. Significant inhibiting effects were also observed from in situ bottle (1.0 L) and mesocosm (50 and 1000 L) experiments on the harmful alga Phaeocystis globosa during its blooms. Based on a large-scale field survey, the phytoplankton abundance in the areas with Gracilaria cultivation was demonstrated to be significantly lower than that in the areas without Gracilaria. Collectively, our results showed that large-scale cultivation of G. lemaneiformis is an effective approach to prevent HABs in coastal waters, as an added value to the economically viable industry of Gracilaria cultivation. © 2014, Springer Science+Business Media Dordrecht. Source

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