Rs. Kirk et al., Survival and transmission of Anguillicola crassus Kuwahara, Niimi & Itagaki, 1974 (Nematoda) in seawater eels, PARASITOL, 120, 2000, pp. 289-295
The study aims were to quantify the survivorship of Anguillicola crassus in
eels in seawater and investigate transmission in estuarine (50 % seawater)
and marine (100 ii, seawater) simulated conditions. Most A. crassus were a
ble to survive and reproduce in 50 % and 100 %, seawater eels for up to 6 m
onths and therefore could survive during the spawning migration of eels to
the Sargasso Sea. Up to 10 % of the parasite metapopulation were damaged af
ter long-term exposure to 50 % or 100% seawater. Transmission of A. crassus
was completed in 50% and 100%, seawater in the laboratory, although infect
ion levels in 100% seawater hosts were always lower. Transmission in estuar
ies is ecologically possible since the copepod Eurytemora affinis is suscep
tible to infection and is the dominant autochthonous species in most tidal
estuaries in the Northern hemisphere. Transmission at sea is unlikely due t
o lack of suitable intermediate hosts. The data support the suggestion that
dissemination of A. crassus has been facilitated by natural movement of ee
ls in coastal waters. It is possible that A. crassus could impair the succe
ss of the eel spawning migration to the Sargasso Sea, although there is no
direct evidence to support this.