An assessment of tobacco waste for control of the gastropod, Tympanotonus fuscatus (Linnaeus) in brackishwater fish ponds
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The common brackish water gastropod, Tympanotonus fuscatus or “periwinkle” can become a serious pest in tidal fish ponds. Control of the molluscs in fish ponds can be accomplished by using tobacco waste. This paper presents the results of behavioural response and survival of T. fuscatus at varying concentrations of tobacco waste. The time taken for 50% of the animals to escape from the solution increased with increasing concentration. The median times were 23, 28, 40, 62 and 213 min. for concent rations of 0.25, 0.50, 0.75, 1.00, and 1.25 g/l. AT 2 g/l no animals escaped. Using 1, 2, and 3 day old solutions, the escape time decreased with the age of the solution. The median lethal time for the snails exposed to lethal concentrations decreased with an increase in the concentration. At 1 g/l, median lethal time was 216 hours, decreasing to 71 hours for 2 g/l. At concentrations less than 2 g/l, T. fuscatus will attempt to escape the solution, but at this or higher concentrations the sn ail will close the operculum and eventually die.