ウスカワマイマイの半合成飼料による飼育
スポンサーリンク
概要
- 論文の詳細を見る
A simple rearing method with a semi-synthetic diet was established for the SIEBOLD's globular snail. This is the first report of a land mollusca reared with a semi-synthetic diet. With this method, a colony of the snails was successfully maintained as long as three successive generations, and their interesting biological characters were also observed. Newly hatched snails were caged in a small plastic container (diameter : 13.5 cm, height : 3.5 cm, diameter of ventilation hole on top : 1.0 cm) and transferred into a larger one (diameter : 15.0 cm, height : 8.5 cm, diameter of ventilation hole : 4.0 cm) when they attained a growth stage of 6 mm in shell-height. A favorable humidity for the growth was kept with a sheet of moist filter paper on the bottom of each cage. As food sources, a commercial weaning food for human babies and a piece of cuttlebone were used for the newly hatched snails, and a semi-synthetic diet composed of soybean and cuttlebone, for those of the later stages (exceeding 6 mm shell-breadth). The optimum rearing density for the newly hatched snails was 10 individuals per smaller container at 30℃, and 30 individuals at 20℃. During the later stage a density of 4-5 individuals per larger container was optimum at 30℃. The optimum temperature for their growth ranged from 25℃ to 30℃. Under 15℃ condition, 100% survival rate was maintained for over 100 days, though the snails hardly grew. On the other hand, under higher temperature conditions, the growth rate was much higher and at 30℃, some snails attained an adult stage after a period as short as 6 months from their hatch. Under the above rearing conditions, a snail copulated 3 times at the highest frequency, and it was often observed that even a pair of snails copulated each other twice. An isolated snail never oviposited, even when they attained an adult stage.
- 日本貝類学会の論文
- 1976-06-30