Acute Effects of a Cylindrospermopsis Raciborskii (Cyanobacteria) Strain on Mouse, Daphnia and FishPedro A. Zagatto1* and Aloysio da S. Ferrão-Filho2
- *Corresponding Author:
- Pedro A. Zagatto
Laboratory Assessment and Health
Promotion Environmental Institute
Oswaldo Cruz-FIOCRUZ Av Brazil 4365
Manguinhos - Rio de Janeiro, RJ 21045-900
Tel: (5521) 2562-1562
Fax: (5521) 2562-1525
E-mail: [email protected]
Received date: October 02, 2012; Accepted date: December 04, 2012; Published date: December 06, 2012
Citation: Zagatto PA, Ferrão-Filho AdS (2012) Acute Effects of a Cylindrospermopsis Raciborskii (Cyanobacteria) Strain on Mouse, Daphnia and Fish. J Ecosyst Ecogr 2:121. doi:10.4172/2157-7625.1000121
Copyright: © 2012 Zagatto PA, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and and source are credited.
The toxicity of a cyanobacterial strain Cylindrospermopsis raciborskii was evaluated in acute toxicity tests with mouse, Daphnia and fish. The test with mouse was performed with aqueous extracts of lyophilized material. The acute tests with Daphnia were performed with three types of samples: (A) culture of cyanobacteria in ASM-1 medium; (B) concentrated cianobacterial cells in culture Daphnia medium; and (C) culture of the strain sonicated and filtered in membranes (45 μm). As controls for each treatment we used ASM-1 and Daphnia culture medium and culture medium with chlorophytes as food for Daphnia sonicated and filtered in membranes (45 μm), respectively. In the acute toxicity test with fish, only sample A was used. The average LD50 (24h) in the mouse bioassays was 16.0±4.3 mg kg-1 and the symptoms were characteristic of neurotoxicosis. The three types of samples were toxic to Daphnia, with sample A as the most toxic and sample C the less toxic. The fish did not show any symptoms, showing greater resistance than Daphnia to this cyanobacterium. We conclude that, since this strain of C. raciborskii is highly toxic to mouse, when blooms of this cyanobacterium occurs in waters for public supply, special care must be taken to eliminate toxins from the water due to risks to human health. Also, since this strain is highly toxic to Daphnia, zooplankton populations may be affected in the natural environments where this cyanobacterium occurs.