Rearing and Population Growth of Fresh Water Snail, Semisulcospira libertina in the Laboratory

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  • カワニナ (Semisulcospira libertina) の累代飼育とその成長について
  • カワニナ(Semisulcospira libertina)の累代飼育とその成長について〔英文〕
  • カワニナ Semisulcospira libertina ノ ルイダイ シイ

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Abstract

The experiment was carried out to find out a rearing method for fresh water snail, Semisulcospira libertina. It was successful to rear snails as far as the 3rd generation in the base-filtrated aquarium containing green algae. A high growth of snails was observed when artificial food was given, but the survival rate of young snails was higher when diatoms or green algae were coexistent than when only artificial food was given. Among green algae Spirodela polyrhiza and Cratoneuron filicinum were most effective for snail growth as means of improving their living conditions and as their foods. The snails of the 3rd generation was produced when the average weight of those of the second reached 385 mg. In this case, the average duration until reaching 385 mg in weight was 13 months after hatching. It is assumed that the survival rate of one-year-old snail of the 2nd generation may be about 3-5%.

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