Egg masses of Pomacea canaliculata were collected monthly from three habitats including reservoir,rice field,and irrigation canals and ditches in Ya' an,Sichuan Province from March to October 2012 and the fecundity of P.canaliculata was studied by using the methods of collecting snail eggs in the fields and breeding in the laboratory.The field investigation results indicated that egg numbers per egg mass varied distinctly,ranging from 33 to 621 individual eggs per mass (an average of 233 individual eggs per mass) with a coefficient of variation (CV) of 55.0％.The egg diameter ranged from 2.17 to 3.20 mm (mean =2.60 mm,CV =8.95％).The number of eggs was significantly positively correlated with the weight of egg mass (P ＜ 0.01).The absolute fecundity value of P.canaliculata in May was the highest (403.1 eggs ·mass-1),and significantly different (P＜0.05) from those in the other months.The absolute fecundity from the reservoir was higher (P＜0.05) than from rice field and irrigation canals and ditches.Meanwhile,a comparative study on the fecundity of P.canaliculata collected from Chengdu,Ya'an and Ziyang was also conducted by using the single-pair mating method in the laboratory.The results showed that the individual relative fecundity values from the three areas were 12.33,9.58 and 10.54 eggs per gram of snail body weight,and 4.55,3.92 and 3.54 eggs per millimeter of the snial shell height,respectively.The individual relative fecundity values of P.canaliculata from the three areas were not significantly different.Our work would provide a preliminary understanding for the reproductive characteristics of P.canaliculata in Sichuan and offer a scientific reference for snail prevention and control.
Pomacea canaliculatafecundityprevention and controlreproductive characteristics
国家科技期刊平台
NSTL
万方数据
维普
