室内飼育による水棲貧毛類Tubifex hattaiの生長と産卵数に対する餌量の影響

概要

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Groups consisting of various numbers of newly hatched individuals from eggs of Tubifex hattai Nomura were reared in mud mixed with various amounts of dried yeast for food (0.0-0.8 g yeast per 80 g mud). Mortality, live weight and fecundity in each group, and the rate of hatched individuals from eggs in deposited cocoons were recorded weekly. In the groups reared with larger amounts of food, the maximum weight per worm and the mean number of eggs per cocoon increased with decreasing numbers of individuals, but mortality became higher and hatchability lower compared with the groups given smaller amounts of food. On the contrary, in the group reared with smaller amounts of food, the mortality dropped, the rate of hatched individuals increased and oviposition continued without ceasing deposition of cocoons over a rearing period of 104 weeks (two years). In the group reared without food, oviposition occurred in two cycles during the rearing period.
社団法人日本動物学会の論文
1983-06-25