The division process of Cryptobia salmositica in experimentally infected rainbow trout (Salmo gairdneri)

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Abstract
Cryptobia salmositica was isolated from its vector, Piscicola salmositica, which was collected from spawning salmon. The organisms were first injected into coho salmon and then maintained in rainbow trout. The process of multiplication is described from Giemsa's stained smears. The first stage of division is the production of two new flagella (one long and one short). This is followed by nuclear division which is not completed until kinetoplast division is completed. Body division commences from the posterior end soon after the long flagellum attaches to the body. Following this, the nucleus, the kinetoplast, and the blepharoplast migrate into the newly divided part of the organism. Final body division is completed after the migration of these organelles. Multiplication of C. salmositica is by unequal longitudinal binary fission.