Abstract Amphibians show a variety of reproductive modes and strategies. The cyclicity and continuity of
reproduction can often be predicted from the annual gonadosomatic index trends in a species specific manner. This
research aims to document the female and male gonadosomatic index profiles and to ascertain the reproductive cyclicity
or continuity of Fejervarya limnocharis (Anura: Ranidae) caught in Mae Sot, Tak Province, Thailand. Frogs were
collected monthly between November 2007 and October 2009 in rice fields and their surrounding areas in the study site.
For each frog, total weight and ovarian/testicular weight were measured to obtain the female and male gonadosomatic
index. The number of female individuals with mature eggs (postvitellogenic eggs) was also counted. The results showed
that female frogs had two main surges of increased GSI in March and September of 2008. Alternatively, male frogs
showed a more gradual increase and decrease in gonadosomatic index, thus the index remaining high throughout the
year. This study concluded that while F. limnocharis in this area is essentially a continuous breeder, it is more optimized
for a cyclic reproduction mode with two breeding cycles during the rainy season