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Biomonitoring with shrimp to detect seasonal change in river water toxicity
Author(s) -
Shigehisa Hatakeyama,
Shiraishi Hiroaki
Publication year - 1998
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620170424
Subject(s) - shrimp , diazinon , pesticide , biomonitoring , toxicology , biology , toxicity , malathion , ecotoxicology , fishery , chlorpyrifos , crustacean , environmental science , zoology , ecology , chemistry , organic chemistry
Seasonal changes in toxicity of Kokai River water to a freshwater shrimp ( Paratya compressa improvisa ) were monitored from 1989 to 1993. A 4‐d toxicity test was conducted three times a week from April to August from 1989 to 1993 to measure mortality. Seventeen pesticides were analyzed during the biological monitoring. Expected shrimp mortalities were calculated by adding mortalities caused by each insecticide at the measured concentrations. Shrimp mortalities increased in late May to mid‐June and could be attributed to additive effects of insecticides such as pyridaphenthion, malathion, and fenobucarb. Mortalities decreased toward the end of June but increased again from July to mid‐August and could be attributed to insecticides such as diazinon or fenobucarb, which drifted directly into the river after aerial pesticide spraying on paddy fields. High mortalities decreased rapidly after heavy rains in August.