Studies on the cockroach, Periplaneta japonica (II)

DOI Web Site Web Site 1 Citations Open Access
  • Shiraki Yuji
    Department of Parsitology, School of Medicine, Gifu University

Bibliographic Information

Other Title
  • ヤマトゴキブリに関する研究 (II)
  • ヤマトゴキブリに関する研究-2-
  • ヤマトゴキブリ ニ カンスル ケンキュウ 2

Search this article

Description

The observations on variations of number of eggs in an egg-sheath, hatching rate and immature period of the roach, Periplaneta japonica, under several environments were carried out and following results were reported in this paper. 1. Number of eggs in an egg-sheath is about 15 both in the colony of female and in the mixed colony of male and female. In the case of even number, eggs are arranged in double line, while number of left side is fewer than right side in the case of uneven number. 2. Thirteen individuals hatched from an egg-sheath of mixed colony (average hatching rate 87%) and 5 from female colony (average hatching rate 30%). 3. Average immature stage of larva from mixed colony was 6 months and only 4 out of 118 individuals needed more than one year. While the one of female colony was 8 months and female matured faster than male. 4. The average longevity of a female reared with a male from mixed colony in a same lot was 137 days and that of female colony was 112 days. And average number of egg-sheath produced by the former was 25, in which 6 were of abnormal sheath, and that of the latter was 14, 8 of which were abnormal ones. The longevity of females one of the reared from egg of female colony was 348 days and no egg-sheath was observed. 5. A generation of the roach is 7 to 8 months and reproduction is taken place even in the winter if temperature rises as higher as in the summer. The increase of roaches may be caused by progress of environment such as better structure of houses and heating apparatus. 6. The longest longevity was observed when the roaches were served with water only and it was longer than the cases neither water nor food was served or food was served only. The resistance of female against starvation was stronger than male. Female lived in 2 weeks and male could live in one week.

Journal

Citations (1)*help

See more

Details 詳細情報について

Report a problem

Back to top