DISTRIBUTION OF CESTODES IN FARMED COMMON CARP (CYPRINUS CARPIO L., 1758) FROM CYPRINID AQUACULTURE IN MACEDONIA

The aim of this study was to determine the distribution of parasites of the class Cestoda in farmed common carp from the cyprinid aquaculture facilities in Macedonia. The representatives of the class Cestoda occur most often during the winter (in 3.47% of examined fish), followed by spring (1.80%) and autumn (1.73%). They haven`t been identified during the summer. 20 fish out of 958 totally examined were infected with cestodes, with a mean intensity of 6.40, and a prevalence of 1.76%. In this study, the following parasite species were established: Caryophyllaeus fimbriceps, Bothriocephalus opsariichthydis and Ligula intestinalis (plerocercoid). Based on the total number of fish examined from cyprinid aquaculture facilities in Macedonia, the highest prevalence from the class Cestoda is determined by Bothriocephalus opsariichthydis (1.04%), followed by Caryophyllaeus fimbriceps and Ligula intestinalis with 0.55% each. The highest mean intensity with parasites of the class Cestoda is determined by Caryophyllaeus fimbriceps (9.40), followed by Bothriocephalus opsariichthydis (6.30) and Ligula intestinalis (3.60). The records of Caryophyllaeus fimbriceps in farmed common carp in the present study are considered as the first records for Macedonian aquaculture.

АНАЛИЗ ЭПИЗООТИЧЕСКОГО СОСТОЯНИЯ РЫБ ДЕЛЬТЫ ДОНА И ВОСТОЧНОЙ ЧАСТИ ТАГАНРОГСКОГО ЗАЛИВА В СОВРЕМЕННЫХ УСЛОВИЯХ, "Наука юга России"

Обобщены сведения по зараженности паразитами сельди Alosa immaculate, тарани Rutilus rutilus, судака Sander lucioperca, сазана Cyprinus carpio, карася серебряного Carassius gibelio, леща Abramis brama, бычка-сирмана Ponticola syrman, бычка-песочника Neogobius fluviatilis, бычка-кругляка N. melanostomum на основании собственных и литературных данных. Спектр паразитических организмов у рыб в дельте р. Дон и восточной части Таганрогского залива в 2019–2020 гг. включал представителей 9 классов: по 1 виду Myxrosporea, Peritricha, Bivalvia, по 3 вида Myxosporidia и Cestoda, 10 видов Monogenea, 6 видов Trematoda, 4 вида Nematoda и 5 видов Crustacea. В общей сложности у представителей азовской ихтиофауны выявлено 33 вида и не определенных до вида паразитов, из которых доминирующее положение (81 %) занимали пресноводные виды. Состав паразитов обследованных рыб отличался низким видовым разнообразием, количественные показатели – широкой вариабельностью. Выявлены потенциально патогенные для здоровья рыб виды (Myxobolus sandrae, Dactylogyrus extensus, D. vastator, Diplozoon paradoxum, Gyrodactylus sprostonae, Ancyrocephalus paradoxus, Caryophyllaeus laticeps, Khawia sinensis, Diplostomum spathaceum, Unionidae gen. sp., Achtheres percarum). Дан анализ эпизоотологической ситуации в дельте р. Дон и в восточной части Таганрогского залива и выделены возбудители, вызывающие заболевания рыб (Ligula intestinalis, Digramma interrupta), животных и человека (Apophallus donicus, Cryptocotyle concava, C. lingua, Hysterothylacium aduncum, Eustrongylides excisus).

Influence of Ligula intestinalis plerocercoids (Cestoda: Diphyllobothriidea) on the occurrence of eyeflukes in roach (Rutilus rutilus) from a lake in south-east England

Vertebrate hosts commonly harbour concurrent infections of different helminth species which may interact with each other in a synergistic, antagonistic or negligible manner. Direct interactions between helminths that share a common site in the host have been regularly reported, but indirect interactions between species that occur in different sites are rarely described, especially in fish hosts. Plerocercoids of Ligula intestinalis are common infections of the peritoneal (body) cavity of roach (Rutilus rutilus) in freshwater habitats. These larval cestodes can cause extensive systemic pathologies to the fish host, which in turn may alter its susceptibility as a target host for other helminth species. The present study, using an existing dataset, investigates the influence of L. intestinalis (ligulosis) on frequently occurring eyefluke infections in roach sampled from a lake in south-east England. The occurrence of two species of eyefluke (Diplostomum sp. and Tylodelphys sp.) in the roach population demonstrated no significant levels of interaction with each other. The prevalence but not mean intensity or abundance of Diplostomum sp. was significantly increased in ligulosed roach, while the incidence of Tylodelphys sp. remained unchanged. Analyses of bilateral asymmetry in the occurrence of eyeflukes in left and right eyes of infected fish demonstrate that Tylodelphys sp. shows significant asymmetry in non-ligulosed roach, which is not replicated in ligulosed individuals. In contrast, Diplostomum sp. shows no evidence of asymmetry in either ligulosed or non-ligulosed fish.