Study on the ecological safety of algacides: a comprehensive strategy for their screening
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The ecological safety of 14 algacidal materials were appraised using algal growth inhibition tests as well as toxicity test for zooplankton and fish and prawn juveniles. In addition, an integrative analysis for evaluating their potential as algacides was made by comparing the 24-h LC50 and ratio of efficiency to safety (RES) of each material. The results showed that the growth of algae tested were not affected after 96 h of exposure to diallyl trisulfide even when the concentration was 10 mg L−1; there was a similar toxicity between garlic solution and diallyl trisulfide on seven species of aquatic organisms tested. Moreover, both prawn juveniles had lower resistances to garlic solution and diallyl trisulfide than the other 12 materials. According to the RES, green tea, garlic solution, diallyl trisulfide, and the Chinese medical herbs Cortex Fraxini, Herba Houttuyniae, Semen Arecae, and Rhizoma Coptidis are better algacides than the other materials tested in this study.
KeywordsAlgacide Ecological safety Ratio of efficiency to safety Aquatic organism Toxicity
This research was supported by the Special Research Funds Program of China for Public Sector(Agriculture): Research and Demonstration of eel pond culture with Sustainable Development Technology (no. nyhyzx07-043), the High-Tech Research and Development Program of China (no.2008AA09Z408), the subitem of National Science Foundation of China (no. B04005), the NSF of China (no. 40930847, 40876061), and the Program for Changjiang Scholars and Innovative Research Team in University (no. 40821063).We would like to thank Professor I. J. Hodgkiss for his assistance with English and L.N. Han for her help with the experiments.
- Lovejoy C, Bowman JP, Hallegraeff GM (1998) Algacidal effects of a novel marine Pseudoalteromonas isolate (class Proteobacteria, gamma subdivision) on harmful algal bloom species of the genera Chattonella, Gymnodinium, and Heterosigma. Appl Environ Microb 64:2806–2813Google Scholar