SnailsBiomphalariaSchistosoma mansoniDisease VectorsLymnaeaFresh WaterAnimal ShellsMolluscacidesBulinusEchinostomaCercariaHost-Parasite InteractionsSchistosomiasis mansoniEgyptMartiniqueGuadeloupeSchistosomaTrematodaSaint LuciaPopulation DensityHemolymphHemocytesInvertebrate HormonesBrazilSchistosomiasisHelix (Snails)EuphorbiaNiclosamideSilver StainingLatexOocystsEgg ShellCompetitive BehaviorBiological PhenomenaConus SnailLethal Dose 50TilapiaEchinostomiasisAngiostrongylusDNA, HelminthLakesArgentinaPest Control, BiologicalGillsPhylogenyPalaemonidaePiperaceaeParasite Egg CountDalbergiaPest ControlEcologySeawaterDNA, Ribosomal SpacerRiversSchistosomicidesFishesMolecular Sequence DataFreshwater BiologySpecies SpecificityCubaRandom Amplified Polymorphic DNA TechniqueLarvaEcosystemDNA, RibosomalPredatory BehaviorGastropodaPlant ExtractsSchistosoma haematobiumWater MicrobiologyPlanktonEnvironmentBivalviaPolymorphism, Restriction Fragment LengthSeasonsTrematode InfectionsPolymerase Chain Reaction