FEEDING THE FAIRY SHRIMP STREPTOCEPHALUS (ANOSTRACA - CRUSTACEA) WITHTHE ROTIFER ANURAEOPSIS

Laboratory-cultured Streptocephalus torvicornis were offered 8 concent rations (from 6 to 800 ind. ml(-1)) of Anuraeopsis fissa for periods o f 2 h 30 min. Two size classes, small (male: 14.7 mm+/-1.6, female: 15 .4 mm+/-1.3) and large (male: 20.0 mm+/-2.0, female: 23.1 mm+/-1.5), o f S. torvicornis were used. Functional response for large S. torvicorn is (both sexes) plateaued at 400 rotifers ml(-1), while in small speci mens it did so at 200 prey ml(-1) Females consumed significantly more (30%) prey than males. Large males consumed maximum 4730 rotifers h(-1 ), females 6560 h(-1).