Dissemination of triactinomyxons (Myxozoa) via oligochaetes used as live food for aquarium fishes.
Freshwater 'tubifex' oligochaetes sold as live food for aquarium fishes were purchased from several pet shops in Munich, Germany, over a 1 yr period (March 2001 to February 2002). These samples were screened for parasitic infections of actinosporean myxozoans to gauge the possibility of parasite dispersal via this route. Of 7 samples, 6 contained infected oligochaetes; waterborne spores were present in 5 samples at the time of purchase. In the laboratory, 12 different types of actinosporeans were released by the oligochaetes. These could be assigned to 4 collective groups: triactinomyxon, aurantiactinomyxon, raabeia and hexactinomyxon; 4 novel triactinomyxons are described herein, a fifth triactinomyxon has been described earlier. Phenotypic descriptions of the spores are accompanied by molecular sequence data (18S rDNA). Descriptions of the other actinosporean types appear elsewhere. The worms sold as 'tubifex' originated from eastern European countries and were identified as a mix of Tubifex tubifex, Limnodrilus hoffmeisteri and L. udekemianus. Sale of live worms (and their accompanying parasite load) has clearly the potential to facilitate introduction both of parasites and suitable hosts to new areas.
Hallett
Sascha L
SL
Institute of Zoology, Fish Biology and Fish Diseases, University of Munich, Kaulbachstrasse 37, 80539 Munich, Germany.
Atkinson
Stephen D
SD
Erséus
Christer
C
El-Matbouli
Mansour
M
D000818:Animals; D001483:Base Sequence; D001837:Body Weights and Measures; D004587:Electrophoresis, Agar Gel; D056890:Eukaryota / Q000166:cytology* / Q000235:genetics*; D005618:Fresh Water / Q000469:parasitology*; D005858:Germany; D008969:Molecular Sequence Data; D009835:Oligochaeta / Q000469:parasitology*; D010641:Phenotype; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D011157:Population Dynamics; D012337:RNA, Ribosomal, 18S / Q000235:genetics; D017422:Sequence Analysis, DNA; D013045:Species Specificity; D033761:Spores, Protozoan / Q000166:cytology / Q000235:genetics*
D012337:RNA, Ribosomal, 18S