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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Keratella

  1. Keratella americana
  2. Keratella cochlearis

1. Keratella americana

[ref. ID; 1264]

Test system

Strains

From Butterfly Lake on August 11, 1972. Immature female, young female without egg, egg-bearing female.

Toxicants

Water-soluble or water-emulsifiable commercial formulations of 2,4,5-T (Line Rider Amine 4T, Veon 245, Line Rider 4T, Dacamine 4T, Lo-Vol 4T, and Lo-Vol 6T).

Test design

Temperature 20 degrees C. Food: Chlorella sp. or Cryptomonas sp. Sampling time: 12, 24, 48, 72, and 96 hr.

Measurements/observations

Mean remaining length of life (days), mean time to hatch (days), and mean longevity.

Evaluations

LC50.

2. Keratella cochlearis

[ref. ID; 1264]

Test system

Strains

From Lake Forest on August 11, 1972. Immature female, young female without egg, egg-bearing female.

Toxicants

Water-soluble or water-emulsifiable commercial formulations of 2,4,5-T (Line Rider Amine 4T, Veon 245, Line Rider 4T, Dacamine 4T, Lo-Vol 4T, and Lo-Vol 6T).

Test design

Temperature 20 degrees C. Food: Chlorella sp. or Cryptomonas sp. Sampling time: 12, 24, 48, 72, and 96 hr.

Measurements/observations

Mean remaining length of life (days), mean time to hatch (days), mean longevity, and form changes.

Evaluations

LC50.