Trpis M
Bull World Health Organ. 1973;48(4):447-53.
The breeding of larvae of Aedes aegypti, Aedes simpsoni, and Eretmapodites quinquevittatus in empty shells of Achatina fulica was studied in the coastal zone of Dar es Salaam, Tanzania. The average density of shells was estimated to be 228 per ha. From 11 to 35% were positive for mosquito larvae. A. aegypti were found in 82-84% of positive shells; A. simpsoni in 8-13%. On Msasani peninsula, during the 3-month rainy season April-June 1970, the larval density of A. aegypti in shells was estimated at 1 100 per ha, that of A. simpsoni and E. quinquevittatus being estimated at 60 and 280 larvae per ha, respectively.Empty shells of A. fulica may contain up to 250 ml of water (average: 56.5 ml). The number of larvae per shell varies from 1 to 35 (average: 8.4) and it was estimated that, depending on the availability of food, and other factors, approximately 10 ml of water are required per larva. Viable eggs of A. aegypti were still to be found in 4% of the shells at the end of the dry season.
在坦桑尼亚达累斯萨拉姆的沿海地区，对埃及伊蚊、辛普森伊蚊和五带埃氏蚊的幼虫在非洲大蜗牛空壳中的孳生情况进行了研究。蜗牛壳的平均密度估计为每公顷228个。其中11%至35%的蜗牛壳中有蚊虫幼虫。在呈阳性的蜗牛壳中，82%至84%发现有埃及伊蚊幼虫；辛普森伊蚊幼虫占8%至13%。在姆萨萨尼半岛，1970年4月至6月的3个月雨季期间，蜗牛壳中埃及伊蚊幼虫的密度估计为每公顷1100条，辛普森伊蚊和五带埃氏蚊幼虫的密度分别估计为每公顷60条和280条。非洲大蜗牛的空壳可能容纳多达250毫升的水（平均为56.5毫升）。每个蜗牛壳中的幼虫数量从1条到35条不等（平均为8.4条），据估计，根据食物供应情况和其他因素，每条幼虫大约需要10毫升水。在旱季结束时，仍有4%的蜗牛壳中发现有埃及伊蚊的活卵。
