8Albrecht EA, Carreno NB, Castro-Vazquez A. 1996. A quanti- tative study of copulation and spawning in the south Ameri- can apple-snail, Pomacea canaliculata (Prosobranchia: Ampullariidae). Veliger, 39 : 142-147.
9Albrecht EA, Carreno NB, Castro-Vazquez A. 1999. A quanti- tative study of environmental factors influencing the season- al onset of reproductive behaviour in the south American Apple-snail Pomacea canaliculata ( Gastropoda : Ampullari- idae). Journal of Molluscan Studies, 65: 241-250.
10Estoy GF, Yusa Y, Wada T, et al. 2002. Effects of food avail- ability and age on the reproductive effort of the apple snail, Pomacea canaliculata (Lamarck) ( Gastropoda : Ampullari- idae). Applied Entomology and Zoology, 37: 543-550.
