AB 13:293-302 (2011)  -  DOI: https://doi.org/10.3354/ab00374

Effects of hydrogen sulfide on the feeding activity of Manila clam Ruditapes philippinarum

Sou Nagasoe1,2*, Tatsuya Yurimoto1,3, Kengo Suzuki1, Yukio Maeno1,3, Katsunori Kimoto1

1Seikai National Fisheries Research Institute, Fisheries Research Agency, Nagasaki, Nagasaki 851-2213, Japan
2Miyazu Station, National Center for Stock Enhancement, Fisheries Research Agency, Miyazu, Kyoto 626-0052, Japan
3Japan International Research Center for Agricultural Sciences, Tsukuba, Ibaraki 305-8686, Japan

ABSTRACT: After being exposed to anoxia for 24 h, with and without hydrogen sulfide (H2S; 5 or 30 mg l−1), the feeding activities of the Manila clam Ruditapes philippinarum were examined in the laboratory under normoxic conditions. The clearance rates of clams after exposure to anoxia with 30 mg l−1 H2S (5.1 l h−1 ind.–1) were significantly lower than in those exposed to normoxic or anoxic conditions (11.4 or 11.2 l h−1 ind.–1, respectively). The phytopigment concentration of the digestive glands of clams treated with 30 mg l−1 H2S under anoxic conditions (41.7 µg g−1, wet weight of digestive gland) was significantly lower than that measured in other experimental treatments in this study (548.4 µg g−1 for normoxia, 461.9 µg g−1 for anoxia only, 479.8 µg g−1 for 5 mg l−1 sulfidic anoxia; p < 0.01). Histological examination of clam tissue revealed that the ciliary epi­thelium was damaged by a high concentration of H2S. These findings indicate that once the clams suffered damage to their gills by exposure to H2S, their feeding activity was impaired and they could not ingest prey, even when their environment was returned to optimal conditions.

KEY WORDS: Clearance rate · Gill · Digestive gland · Ingestion · Histology

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Cite this article as: Nagasoe S, Yurimoto T, Suzuki K, Maeno Y, Kimoto K (2011) Effects of hydrogen sulfide on the feeding activity of Manila clam Ruditapes philippinarum. Aquat Biol 13:293-302. https://doi.org/10.3354/ab00374

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