Semi-field studies on the bionomics of biomphalaria alexandrina in Egypt

ABSTRACT

Maximum growth of Biomphalaria alexandrina occured in Spring and minimal growth in Winter. A definite annual cycle in reproductivity and frequency was also recorded. Breeding was intense and mortality was low in Winter oviposition was at a high level in Spring and decreased in Summer. The snail population built gradually in Winter and Spring until a major density peak was reached in June, declined in Summer and breeding started again in Autumn