Assessment of infection of hamsa Engraulis encrasicolus nematode Hysterothylacium aduncum in the Sea of Azov in the summer and autumn periods 2015-2020

The dynamics of infection of anchovy Engraulis encrasicolus Linnaeus, 1758 with nematode parasite Hysterothylacium aduncum Rudolphi, 1802 in the Sea of Azov during the summer seasons of 2015 and 2017-2020 and autumn seasons of 2017-2020 is analyzed. To specify the scheme of infestation, the division of nematodes into living and degenerating ones was used. The degenerating specimens were attributed to three stages of destruction. The infection rate was estimated by using of the common parasitological indices (prevalence of infection, intensity values, abundance of larvae). Statistical analysis of data obtained in the process of the research was conducted using Spearman’s rank correlation.

Helminth fauna of spawning pacific herring Clupea pallasii from the Taui population (Tauiskaya Guba Bay, Okhotsk Sea)

Parasites of spawning pacific herring (Clupea pallasii Valenciennes in Cuvier et Valenciennes, 1947) from the Taui population are explored on the samples caught on two spawning grounds located in the Ola lagoon and Amakhton Bay (Tauiskaya Guba Bay, Okhotsk Sea), and 17 species of helminthes are found, including 6 trematodes, 5 cestodes, 4 nematodes, and 2 acanthocephalans. Some differences in species composition of helminthes and their infestation were found between these estuarine and marine spawning grounds. In the Ola lagoon, 16 species of helminthes were identified, including 5 species of cestodes, whereas only 13 species of helminthes, including 3 species of cestodes, were found in the Amakhton Bay. The Taui population of herring is distinguished from the Okhotsk and Gizhiga-Kamchatka populations by presence of nematodes Hysterothylacium aduncum, l, and Ascorophis pacificus with rather high rates of invasion (occurence = 52.9 %; mean abundance = 4.16) and trematode Bucephaloides spp. On the other hand, the herring from the Taui population has common dangerous parasites with other populations in the Okhotsk Sea, as trematode Brachyphallus crenatus and nematode Anisakis spp. (larvae), with high degree of infestation.

Endohelminth fauna of teleost fishes from coasts of Şile region of the Black sea

Summary A total of 508 fish specimens belonging to 19 species collected in the coast of Şile region of the Black sea were examined to detect the presence of endohelminths. Of this, 357 (70.27%) were found to be infected with parasites. 15 distinct helminths species were recovered including four species of nematodes, seven digenean species, one species of cestodes and three species of acanthocephalans. It was also determined that the species of nematode Hysterothylacium aduncum was the most common parasite and the most diverse endohelminth fauna was found in Gobius niger and Solea vulgaris, with five species. Furthermore, it should be noted that Capillaria gracilis is reported for the first time from the Turkish coasts. The infection rates, hosts, and parasites are listed in this paper.

The helminth fauna of Pontic shad (Alosa Immacculata Bennet, 1835) from lower Dniester

In this study 60 specimens of Pontic were caught from lower Dniester, Stefan Voda district, Olănesti. As a result of the parasitological study of Pontic shad, three species of helminths were detected: Pronoprymna ventricosa (Rudolphi, 1819) Poche, 1926, Lecithasther confusus Odhner, 1905), Hysterothylacium aduncum (Rudolphi, 1802). The degree of infestation with these species was different. The most abundant species was Hysterothylacium aduncum with an extensivity of invasion of 85% and intensivity of invasion 1 – 80 parasites per fish, followed by Pronoprymna ventricosa (EI-20%, II-2-18 ex.) and Lecythaster confusus (EI-7,8%, II-1-12 ex.).

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).

Metazoan Parasites Infecting Xiphias gladius from the Eastern Coast of Algeria (SW Mediterranean Sea)

Five specimens of Xiphias gladius Linnaeus, 1758 were sampled from the eastern coast of Algeria and examined for their metazoan parasites. Pathological effects of the collected parasites were examined for the whole body of X. gladius. Four metazoan parasites species were collected: two monogeneans (Tristoma coccineum Cuvier, 1817; T. integrum Diesing, 1850), one copepod (Pennella instructa (Wilson, 1917)) and one parasitic nematode (Hysterothylacium aduncum (Rudolphi, 1802)). We report here for the first time a symbiotic species, Conchoderma virgatum Spengler, 1789 (Cirripedia) fixed on P. instructa. Collected monogenean and the copepod species are newly recorded for Algerian coast. Xiphias gladius is a new host for H. aduncum in the studied region. All examined specimens were infected (P = 100 %). The collected copepod parasite, P. instructa (P = 60 %) induces serious pathological effects to its host (necrosis and hemorrhage particularly). Histological sections showed that this copepod causes skin lesions, deteriorations on the dermal and muscle tissue.

Anisakis physeteris and Pseudoterranova decipiens in the Mugil curema fish caught in Tumaco, Colombia

Objetivo. Identificar nematodos de la familia Anisakidae en el pez de consumo Mugil curema. Materiales y métodos. Para este estudio, se recolectaron 16 peces Lisa (M. curema) del puerto de Tumaco, una ciudad en la costa colombiana del Pacífico. La identificación morfológica de las larvas se realizó mediante taxonomía clásica y se calculó el porcentaje de infestación de larvas. Para la identificación molecular, se realizó una PCR múltiple con cebadores para las especies Anisakis physeteris, Pseudoterranova decipiens, Anisakis simplex sensu stricto, Contracaecum osculatum, Hysterothylacium aduncum y Anisakis pegreffii. Resultados. La revisión taxonómica permitió la identificación de larvas de tipo II del género Anisakis y larvas del género Pseudoterranova. Las larvas se aislaron principalmente del intestino, donde se encontró que el 94% de los peces estaban parasitados por nematodos anisakidos. La PCR multiplex permitió la identificación de la especie A. physeteris (Larva tipo II) y P. decipiens. Conclusiones. Este estudio en el primer reporte del nematodo Anisakidae en Tumaco, Colombia. Estos resultados proporcionan una justificación convincente para un estudio adicional sobre la familia Anisakidae en Colombia, como un problema de salud pública.