Larves d'Ascarides parasites de Poissons en Méditerranée occidentale

Abstract

Larves d' Ascarides parasites de Poissons en Méditerranée occidentale par Annie J. Petter et Claude Maillard Résumé. -Les larves d'Ascarides parasites de Poissons Téléostéens de Méditerranée occidentale présentes dans les collections du Muséum national d'Histoire naturelle de Paris sont étudiées. Neuf espèces différentes de larves ont été trouvées : Anisakis simplex s. 1. [= Anisakis sp. larva (I) de Berland] ; Anisakis physeteris [= Anisakis sp. larva (II) de Berland] ; Pseudoterranova decipiens ; Contracaecum sp. ; Hysterothylacium aduncum ; H. fabri ; H. arnoglossi ; Hysterothylacium sp. n os 1 et 2. Les larves de Contracaecum sp. et Hysterothylacium sp. n" 1 et 2 sont décrites ; des planches de figures sont données pour toutes les espèces et des mensurations pour les larves de Hysterothylacium aduncum, H. fabri et H. arnoglossi. Chez les espèces H. aduncum et H. fabri , la valeur des rapports longueur totale/longueur oesophage, longueur oesophage/longueur appendice oesophagien et longueur oesophage/longueur caecum intestinal est plus faible chez les larves que chez les adultes. Les larves les plus fréquemment rencontrées sont celles de H. fabri (chez 54,5 % de Poissons étudiés), H. aduncum (23,6 %) et Anisakis simplex s. 1. (11,8%). Un tableau dichotomique des différentes larves étudiées est donné.Abstract. -Larval Ascarids parasites of fishes from western Mediterranean sea. -Larval Ascarids parasitic in Teleostean fishes from the western Mediterranean, present in the collections of the Muséum national d'Histoire naturelle de Paris, are studied. Nine distinct larval types were found : Anisakis simplex s. 1. [= Anisakis sp. larva (I) Berland] ; A. physeteris [= Anisakis sp. larva (II) Berland] ; Pseudoterranova decipiens ; Contracaecum sp. ; Hysterothylacium aduncum ; H. fabri ; H. arnoglossi ; Hysterothylacium sp. n os 1 and 2. Illustrations are given for each species and measurements for H. aduncum, H. fabri and H. arnoglossi. Contracaecum sp. and Hysterothylacium sp. n os 1 and 2 are described.A key for all of these larvae is proposed. In Hysterothylacium aduncum and H. fabri, the ratios : total body length/oesophagus length, oesophagus length/appendix length, oesophagus length/caecum length are smaller in larvae than in adults. The most common larvae are those of H. fabri (in 54,5 % of the studied fishes), H. aduncum (23,6%) and Anisakis sp. s. 1. (11,8%).

Influence of Thermal Regimes on the Relationship between Parasitic Load and Body Condition in European Sardine along the Catalan Coast

“…For better identification of internal structures, nematode parasites were cleared in Amann's lactophenol. Parasites were classified based on their morphology and internal structures to the lowest possible taxonomic level and larval stage, following several keys and descriptions [39][40][41]. Digenean trematodes infecting sardines were identified and quantified, but no lower taxonomic level was specified because the present study focused on nematode parasites.…”

Hysterothylacium aduncum

“…These values were determined in our laboratory (Ruiz-Valero, 1991), although there may be some variation due to the source of the parasite or its level of development. Other data for morphological identification can be found in Petter and Maillard (1988), Petter et al (1995) and Yoshinaga et al (1987a). The low genetic variability of this parasite obviates the need for molecular identification (Klimpel et al, 2007).…”

“…These are often heavily parasitized by larval and/or adult stages, with high prevalence (up to 100%) as a function of catch area and/or age of the fish. Among commercial species that may show high prevalence and/or intensity are Clupea harengus (herring); Engraulis encrasicolus (anchovy); Gadus morhua (cod); Merluccius merluccius (European hake); Merluccius australis (southern hake); Scomber japonicus (chub mackerel); Scophthalmus maximus (turbot); Lepidorhombus whiffiagonis (m egrim); Sardina pilchardus (sardine); Trachurus trachurus (horse mackerel); Micromesistius poutassou (blue whiting); Phycis blennoides (greater forkbeard); and Trisopterus luscus (pouting) (Adroher et al, 1996;Álvarez et al, 2002;Andersen, 1993;Carvajal et al, 1995;Costa et al, 2018;Huang, 1988;Moravec and Nagasawa, 2000;Navone et al, 1998;Petter and Maillard, 1988;Rello et al, 2008aRello et al, ,b, 2009Ruiz-Valero et al, 1992;Sanmartín et al, 1989;Valero et al, 2000Valero et al, , 2006.…”

Anisakid parasites of the pouting (Trisopterus luscus) from the Cantabrian Sea coast, Bay of Biscay, Spain

“…Larvae were gathered from the liquid resulting from pepsin digestion and washed with 0.9% NaCl solution. Subsequently, after preservation in 70% ethanol, they were cleared in lactophenol and mounted for microscopic observation and identification according to the compatibility of their morphological features with descriptions by Berland (1961), Petter & Maillard (1988) and Petter & Cabaret (1995).…”