Étude sur la biologie des premiers stades larvaires d'Anguillicola crassus (Nematoda, Dracunculoidea) : spécificité de l'hôte intermédiaire et influence de la température sur la durée du développement

Abstract

RÉSUMÉ Des tentatives d'infestation de divers Arthropodes avec des oeufs et des larves éclosesà'Anguillicola crassus, Nématode parasite de la vessie gazeuse de l'Anguille, sont effectuées. Le développement jusqu'au 3 e stade est obtenu uniquement chez les Copépodes Cyclopidae etchezI'Ostracode Cypriaophthalmica. La croissance des larves et la durée du développement chez les Cyclopidae sont étudiées à 4 températures différentes : les premières larves du 3 e stade apparaissent à J6 à 28 °C, à J9 à 21 °C et à J31 à 12-14 °C ; à une température de 4-6 °C les larves ne montrent aucun développement après 91 jours d'infestation. Mots-clés : Anguillicolacrassus ; Nematoda ; Anguilla anguilla ; biologie des premiers stades larvaires. STUDIES ON THE BIOLOGY OF THE EARLY LARVAL STAGES OF ANGUILLICOLA CRASSUS (DRACUNCULOIDEA, NEMATODA) : SPECIFICITY OF THE INTERMEDIATE HOST AND EFFECT OF TEMPERATURE ON RATE OF DEVELOPMENT. ABSTRACTInfection of various Arthropods was attempted with eggs and larvae of Anguillicola crassus, a nématode parasite of the swimbladder of eels. Development up to the third larval stage was obtained only in Cyclopid Copepods and in Cypria ophthalmica (Ostracoda). Development was followed in Cyclopidae at 4 différent températures : third-stage larvae first appeared on day 6 at 28 °C, on day 9 at 21 °C, and on day 31 at 12-14 °C. No development occurred at 4-6 °C when observation was discontinued 91 days post infection.

Recovery of Third-Stage Larvae of Anguillicola Crassus (Nematoda : Dracunculoidea) From the Flesh of Fishes : Assessment of a Digestive Medium as a Tool for the Study of Fish Paratenic Hosts.

“…Larval survival was lower at 30°C than at 20°C (see Table 2), confirming results of DE CHARLEROY et al (1989), BONNEAU et al (1991) and THIBAUT (1992). Whatever the section type, digestion was better at 30°C than at 20°C.…”

“…The effect of temperature on survival of A. crassus L2 larvae has been investigated by DE CHARLEROY et al, 1989, BONNEAU et al, 1991, and THIBAUT, 1992. In the range 12-41°C, larval mortality increased with temperature.…”

Spatio-temporal dynamics of the nematode Anguillicola crassus in Northeast Tunisian lagoons

“…The survey of the evolutionary dynamic of parasitism reveals that A. crassus is present throughout the year in the Ichkeul lagoon, which is characterized by a low salinity (3-16h). The lagoon is fed by several wadis, where the intermediate host copepod, cyclopidae or ostracod [3,[11][12][13][14], the paratenic hosts fish [13][14][15], Amphibians and larvae of aquatic insects [3] are undoubtedly present, favouring the progress of the life cycle of this parasite. The low prevalence values recorded in December (12%) increase slightly in February and January, reaching a maximum in March (35%).…”