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Diseases of Aquatic Organisms

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DAO 45:141-144 (2001)  -  doi:10.3354/dao045141

Effects of trematode infection on metabolism and activity in a freshwater snail, Semisulcospira libertina

Kazuko Shinagawa*, Misako Urabe**, Makoto Nagoshi***

Department of Biological Science, Faculty of Science, Nara Women¹s University, Kitauoyanishi-machi, Nara 630-8506, Japan
Present addresses: *Fumigaoka-machi 15-18, Tondabayashi, Osaka 584-0094, Japan **(Corresponding author.) Japan Science and Technology Corporation, Aqua Restoration Research Center, Kasada, Kawashima-cho, Hashima-gun, Gifu 501-6021, Japan. E-mail: ***Shimizu 856-36, Anno, Mie 514-2305, Japan

ABSTRACT: Changes in the metabolism and activity of the freshwater snail Semisulcospira libertina infected with larval trematodes were studied experimentally. In snails up to 11 mm in shell width, crawling distance, feeding frequency, and the proportion of individuals located on vertical walls did not differ among snails infected with mature or immature cercariae, or uninfected snails (p > 0.05). In snails larger than 11 mm, individuals infected with mature cercariae tended to feed more frequently during the light period (p = 0.0081), but the distance they crawled and the proportion of individuals located on vertical walls did not differ, regardless of infection (p > 0.05). Infection with mature cercariae significantly increased the oxygen consumption rate (p = 0.016), which was measured only in the large size.

KEY WORDS: Semisulcospira libertina · Larval trematodes · Activity · Metabolism

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