However, after four months, isolated appearance of Capillaria was observed in few tanks. The treatment was repeated. No significant adverse effects of treatment were observed. The youngest fish in the system which received medication had been feeding on brine shrimp for at least five days. No toxicity was observed.
Parasitic infections are common in fresh water fish and heavy infestations can be lethal.
We feel the wasting illness and reduced fertility seen in our fish was the result of nutritional deprivation since the intestinal bulb of all fish examined was fully occupied by live worms. Eradication of the parasite was coincident with weight gain and a dramatic improvement in fertility. Within a large facility, recurrence even after several months is possible, and fish with wasting syndrome should be routinely checked for parasites. We thank Drs. A new anti-helminthic for removing monogenetic trematodes from fish.