Main Content

The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Potamothrix hammoniensis

[ref. ID; 7044]

Test system

Bioassay

Strains

Worms were collected from Gorvaln Bay of Lake Malaren, central Sweden. Small worms (less than one week old and weighing about 0.2 mg).

Toxicants

Sediment (Lake Hjalmaren, Lake Malaren, Lake Rogsjon, Lake Runn).

Test design

Experiments were conducted in darkness at 21+/-1 degrees C in vessels 5.5 cm wide, 7 cm high, with a sediment depth of 1.5 cm and with 50% aerated tap water and 50% deionized water above the sediment surface. 5 worms. Different food conditions (0, 25, 75 mg/week). Experimental period 500 days.

Measurements/observations

Number and weight.

Evaluations

Growth rate.