Malays. Appl. Biol. (1998) 27(1 & 2): 63-67
PREVALENCE AND ECOLOGY OF FRESHWATER SNAILS IN PUNJAB
A. MAQBOOL*, C.S. HAYAT, T. AKHTAR, A.D. ANJUM and B. HAYAT
Faculty of Veterinary Science, University of Agricluture, Faisalabad-38040
*Dept. of Zoology, University of the Punjab, Lahore-54770, Pakistan
ABSTRACT
Eleven snail species belonging to Pulmonata and Prosobranchia classes were collected from 6 districts of the Punjab province, Pakistan. These were Lymnaea luteola, L. acuminata, L. truncatula, L. auricularia, L. rufescens, Bullinus contortus, Physa acuta, Indoplanorbis exiistus, Gyraulus convexiuscutus, Oncomelonta Impensis and Bellamaya bengalensis. Prevalence of snails was high in autumn followed by spring and summer and decreased in early winter. Factors affecting snail population (under field conditions) including water temperature, light, water depth and hydrogen ions concentration (pH) were also studied. The optimum favourable temperature 26.0 ± 1.0°C, maximum day light (14 hr) and pH ranging from 6.0 to 7.14 were recorded.
ABSTRAK
Sebelas spesies siput dari kelas Pulmonata dan Prosobranchia, iaitu Lymnaea luteola, L. acuminata, L. truncatula, L. auricularia, L. rufescens, Bullinus contortus, Physa acuta, Indoplanorbis exiistus, Gyraulus convexiuscutus, Oncomelonta Impensis dan Bellamaya bengalensis telah dikutip dari 6 daerah kawasan Punjab, Pakistan. Prevalens siput adalah tinggi pada musim luruh, diikuti musim bunga dan musim panas dan menurun pada musim sejuk. Faktor-faktor yang mempengaruhi populasi siput termasuk suhu air, cahaya, kedalaman air dan pH juga dikaji. Parameter-parameter optimum yang telah direkodkan ialah suhu 26.0 ± 1.0°C, 14 jam cahaya siang maksimum dan pH berbanjaran 6.0 — 7.14.
Key words: Freshwater snails, Prosobranchia, Pulmonata
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