Physa acuta check for this species in other resources - water bug - Sphaerodema rusticum check for this species in other resources - predation - India"/>
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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 97, No. 4, 2002, pp. 531-534
Bioline Code: oc02101
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 97, No. 4, 2002, pp. 531-534

 en Predation Potential of the Water Bugs Sphaerodema rusticum check for this species in other resources on the Sewage Snails Physa acuta check for this species in other resources
G Aditya & SK Raut

Abstract

The sewage snail Physa acuta check for this species in other resources is a serious threat to certain economic plants and to the purification plant of sewage works by rendering the biofilters ineffective. Various attempts are being made to control it. The efficacy of the predacious water bugs Sphaerodema rusticum check for this species in other resources was judged experimentally, in the laboratory in the potential control of P. acuta . It is revealed that, when supplied separately, the first, second and third instar and the adult S. rusticum did not attack P. acuta belonging to 3.1-8 mm, 5.1-8 mm, 7.1-8 mm and £ 3 mm size classes respectively. In the remaining trials predation rate varied from zero to eight (average 2.3) individuals per predator per day. In experiments with P. acuta belonging to all the size classes supplied together, none, except the first instar S. rusticum , attacked the prey individuals belonging to the lowest (£ 3 mm) size class. The first and second instar S. rusticum , in both trials did not attack P. acuta larger than 4 mm and 5 mm in shell length respectively. The water bugs belonging to the third, fourth, fifth instar and adult stages though preyed upon P. acuta with 3.1-8 mm shell length. The average rate of predation by a single S. rusticum varied from 0.14-3.08 individuals per day depending upon the size of P. acuta and the stage of S. rusticum . A single S. rusticum , irrespective of instar and adult stages, destroyed on average 4.16 P. acuta daily irrespective of sizes. It is estimated that one S. rusticum could destroy 1,360 P. acuta in its life time. The results clearly indicate that the water bug S. rusticum may be used to control the snails P. acuta .

Keywords
sewage drains - snail - Physa acuta check for this species in other resources - water bug - Sphaerodema rusticum check for this species in other resources - predation - India

 
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