Studies on the Philometrosis of Crucian Carp—IV (original) (raw)

Abstract

The first stage larvae of Philometroides carassii(ISHII, 1931) NAKAJIMA et EGUSA, 1977, measured 332-404μlong in whole body length, were eaten actively by Cyclops; Cyclops strenus FISHER, C. vicinus ULJANIN and Tropocyclops prasinus(FISHER). The swallowed larvae penetrated the stomach wall of Cyclops and moved to the hemocoel within five hours. Most larvae began to grow in two days in the hemocoel under room temperature(21-26°C)and fully developed within a week when their total body length reached about 470μon the average, though the maximun size reaching 554μ. In this first one week the tail length was gradually decreased, and afterward the total body length changed no longer until after 20 days. Cyclops infected with numerous larvae lost activity and died within a week.