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Microcystins in cyanobacterial blooms from two freshwater prawn (Macrobrachium rosenbergii) ponds in Northern Thailand


, : Microcystins in cyanobacterial blooms from two freshwater prawn (Macrobrachium rosenbergii) ponds in Northern Thailand. ScienceAsia 32(4): 365-370

The presence of cyanobacterially-produced microcystins (cyclic peptide hepatotoxins) was determined by analysis of Microcystis spp. in scum and water samples collected from a surface cyanobacterial bloom at a giant freshwater prawn (Macrobrachium rosenbergii) farm in Teung District, Chiang Rai Province, in northern Thailand during March to August 2004. M. aeruginasa and M. wesenbergii were the dominant species of cyanobacteria at concentrations between 850,000 190,000 and 302,000 73,000 colonies l(-1). Microcystins were present at 0.44 +/- 0.020 g kg(-1) dry weight with microcystin-LR and microcystin-RR as the dominant microcystin types, accounting for 45% and 48% of the total microcystins detected, respectively. Microcystins in pond water were present at between 2.2 +/- 3.0 mu g l(-1) and 9.4 +/- 2.0 pg l(-1). Total microcystin concentrations in water seemed to be positively correlated with the number of Microcystis colonies. A decrease of microcystins in water was observed from April to August 2004, which may have resulted from removal by mechanisms not examined in this study. The total microcystin in water was slightly negatively correlated with total culturable bacteria numbers. Microcystis spp. colony number showed a significant negative correlation with soluble reactive phosphorus (r = -0.98; p < 0.05). Nitrate-N, ammonium-N and soluble reactive phosphorus concentrations were between 1.2-1.9, 0.85-1.15 and 0.9-1.7 mg l(-1), respectively. Phosphorus concentrations were higher than the permitted limit for waste water from a fishery farm (less than 0.4 mg l(-1)). This study suggested that surface blooms of Microcystis species in cultivation ponds may present a risk for microcyst in bioaccumulation in prawns, either directly or via other organisms in the food web.

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Other references

Anderson, S.D.; Charlton, B.; Weiler, J.M.; Nichols, S.; Spector, S.L.; Pearlman, D.S.; Boushey, H.; Casale, T.; Ford, L.; Greos, L.; Halverson, P.; Hampel, F.; Korenblat, P.; Irani, A-Marie.; Matz, J.; Nayak, A.; Ostrum, N.; Pearlman, D.; Pedinoff, A.; Prenner, B.; Qaqundah, P.; Quesada, J.; Ratner, P.; Rundell, K.; Shapiro, G.; Sorkness, C.; Spector, S.; Tan, R.; Weinstein, S.; Ziering, R., 2009: Comparison of mannitol and methacholine to predict exercise-induced bronchoconstriction and a clinical diagnosis of asthma. Asthma can be difficult to diagnose, but bronchial provocation with methacholine, exercise or mannitol is helpful when used to identify bronchial hyperresponsiveness (BHR), a key feature of the disease. The utility of these tests in subjects with...

Stafford, J., 1986: The wintering cormorant survey, 1985/86. Isle of Wight Birds, 34

Collier, Albert, 1954: A study of the response of oysters to temperature, and some long-range ecological interpretations. Combined study of the rates of pumping, growth, and mortality shows that the optimum temperature range for Crassostrea virginica lies between 15 and 25[degree]C, even on the Gulf Coast of the United States. The northern limit of distribution of th...

Staudinger, M.R.; Erk, S.; Walter, H., 2012: Dorsolateral prefrontal cortex modulates striatal reward encoding during reappraisal of reward anticipation. Recent research showed that cognitive emotion regulation (ER) both increases activity in the dorsolateral prefrontal cortex (DLPFC) and decreases striatal responsivity to monetary rewards. Using a mixed monetary incentive delay/memory task as well...

Hoflund, S., 1946: Investigations in the physiology of the stomach in new-born calves. Svensk Veterinartidskr 51(4-5-6): 88-101, 122-134, 158-163

Ayad, M.M.; Yousef, M., 1985: D.c. polarographic determination of certain aminoglycosides. Analyst 110(8): 963-965

Kellermann, A.L., 2010: The base of the pyramid. Western Journal of Emergency Medicine 11(3): 233-234

Fenoglio-Marc, L.; Schöne, T.; Illigner, J.; Becker, M.; Manurung, P.; Khafid,, 2012: Sea Level Change and Vertical Motion from Satellite Altimetry, Tide Gauges and GPS in the Indonesian Region. We investigate the sea level rise in Indonesia during the period 1993 2011 using satellite altimetry and tide gauge data. Satellite altimetry indicates a positive sea level rise with mean of 4 mm/yr, which is higher than the global averaged mean s...

He, Y-Fang.; Nan, M-Lun.; Sun, J-Ming.; Meng, Z-Jie.; Li, W.; Zhang, M., 2013: Design, synthesis and cytotoxicity of cell death mechanism of rotundic acid derivatives. In the present investigation, 16 new rotundic acid (RA) derivatives modified at the C-3, C-23 and C-28 positions were synthesized. The cytotoxicities of the derivatives were evaluated against HeLa, A375, HepG2, SPC-A1 and NCI-H446 human tumor cell...

Boitor I.; Muntean M.; Groza I.; Moise D.; Musca M.; Kadar L.; Ghitulescu C., 1988: Investigations on the stimulating effect of minerals on young female cattle with acquired utero ovarian hypoplasia. The experimentations were on young female Romanian Spotted cattle aged 3-4 years, diagnosed with 1st degree utero-ovarian hypoplasia due to nutritional disorders. The mineral supplements were: sodium selenite 2 mg (only one administration); cobalt...