Abstract

Oxygen consumption by Procambarus clarkii (Louisiana red crayfish) was studied in laboratory in animals exposed to six different biodegradable surfactants: non-ionic Genapol OA-080, Genapol UD-080, Genapol OX-080, Emulsogen EL, Emulsogen EL 400 and anionic sodic dioctil-sulfosuccinate. Three concentrations, 0.0025, 0.0050 and 0.0100% (w/v) respectively, at the temperature of 20°C, were tested. Tests with Genapol OX-80 were further extended to concentrations of 0.0008 and 0.0003% (w/v). In general, oxygen uptake inhibition occurred on Procambarus clarkii upon exposure to these surfactants. It is assumed that inhibition of oxygen consumption by Procambarus clarkii in the presence of surfactants results in a decrease of physical activity, as consequence of a reduction of the metabolic rate. This effect might be useful in agrochemical methodologies to control crayfish activity to reduce damage in rice cultures. This methodology envisaged as a development of cleaner procedures (pesticides alternative) for controlling Procambarus clarkii populations in rice fields. Moreover, the application of this methodology might facilitate the management of crayfish populations in rice fields, taking profit of increased rice production and crayfish biomass that may be useful as valuable food for humans and animals.

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