EVALUATION OF CAGING DESIGNS AND A FINGERNAIL CLAM FOR USE AN IN SITU BIOASAY

摘要

Two cage designs and fingernial clams (Sphaerium fabale) were evaluated for their suitability for use in in situ bioassays to assess the ecological condition of a stream and predict ecological recovery potential. One design (referred to as tray design) was a modified pastic tray about one-fourther full of small gravels and covred with 1 mm fiberglass mesh. The seocnd design (referred to as tube-plates) consisted of short plexiglass tubes about one-third full of small gravels and attached horizontally to a plexiglass plate.