Knopf, K.; Würtz, J.; Sures, Bernd; Taraschewski, H.:

Impact of low water temperature on the development of Anguillicola crassus in the final host Anguilla anguilla.

In: Diseases of aquatic organisms : international journal., Jg. 33 (1998) ; Nr. 2, S. 143-149
ISSN: 0177-5103
Zeitschriftenaufsatz / Fach: Biologie
The effect of low water temperatures on the development and viability of larval and adult
Ang~lillicolac rassus (Nematoda) in the final host Anguilla ang~lillaw as studied. European eels were
experimentally infected with A. crassirs and then maintained for 4 mo at 4,9, 10 and 19°C. Larval development
showed a temperature-dependent pattern and was significantly retarded at low temperatures.
Third-stage larvae survived a 4 mo period at 4'C without belng affected, although they were not able
to invade the swimbladder wall at this temperature. In contrast, adult worms were severely harmed
during a 4 mo period at 4'C, as reflected by increased mortality and decreased growth and reproductivity
compared to the worms maintained for Lhe same period at 18°C. Starvation of the eels for 4 mo at
19°C dld not affect the development and growth of the nematode The experimentally obtained results
support the hypothesis that the spread of A. crasslrs in boreal regions, e.g. Northern Europe, IS
restricted by the natural ambient temperature regimes.