. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ANIMAL HUSBANDRY AND DISEASE Reference: Biol. Bull. 195: 227-228. (October 1998) 227 In vivo and in vitro Growth of Nerve Parasite from Lophius americanus Earl Weidner and Teresa King (Biology, Louisiana State University. Baton Rouge, Louisiana) Microsporidian parasites of the genus Spraguea develop in neuronal cells in the central nervous system of different species of the genus Lophius (1). Large colonies ( 1 mm in diame- ter) of parasites locate in the trigeminal ganglia, dorsal spinal root ganglia, and supramedullary
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ANIMAL HUSBANDRY AND DISEASE Reference: Biol. Bull. 195: 227-228. (October 1998) 227 In vivo and in vitro Growth of Nerve Parasite from Lophius americanus Earl Weidner and Teresa King (Biology, Louisiana State University. Baton Rouge, Louisiana) Microsporidian parasites of the genus Spraguea develop in neuronal cells in the central nervous system of different species of the genus Lophius (1). Large colonies ( 1 mm in diame- ter) of parasites locate in the trigeminal ganglia, dorsal spinal root ganglia, and supramedullary cells (SMCsl. All of these neurons appear to send fibers to the skin. Recent tracer studies by Fanakoshi ct <//. (2) indicate that SMCs extend single or branched fibers directly to the skin. The infective spore stages of Spraguea are activated to discharge in Lophius surface mu- cus, and it is therefore believed that peripheral fibers of the fish may be parasitized directly upon the injection of sporoplasm from the activated spore into the nerve fiber. The parasitism of Lophius by Spraguea begins during the first year of the fish's growth, presumably after the shift from a pelagic to benthic existence. The development of the parasites into colonies is primarily confined to neuronal processes proxi- mal to the cell body (Fig. 1). The parasites locate freely within the cytoplasm of the host cell, although each colony appears to be confined to specific domains by the accumulation of interme- diate filaments that surround the parasites. In older fish, the colonies consist primarily of spores, although vegetative (mer- onts) elements persist even in the old colonies. The size of the parasite colony within the nerve process effectively blocks axonal flow; nevertheless, the cell body of host retains viability. For in vitro studies, colonies were removed from the sur- rounding host cells; the dense network of intermediate filaments surrounding the parasites permits their easy remov
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