Abstract
1. 1. Life history study on Lernaea cyprinacea showed that the first copepodid stage appeared 3–4 days after hatching and there are six copepodid stages similar to those reported in other studies on this species. The life cycle from egg to mature adult was completed in 13–14 days at 22–25°C. 2. 2. Complete elimination of anchor worms was achieved by the use of 0.8: 10 000 formalin and 0.3 to 1 ppm of dipterex. 3. 3. Dipterex gave an effective control of anchor worms in ponds after four bi-weekly treatments at a rate of 1 ppm.
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