The infection with Myxobolus intimus Zaika, 1965 in the gills of the roach Rutilus rutilus (L.) from Lake Balaton was recorded in 28 out of the 39 fish examined. Developing and mature plasmodia were detected on the gills exclusively in the spring. The Myxobolus intimus infection was found only in 2- to 3-year-old fish. In histological sections, young plasmodia were found in capillaries of the s...

Over the period 1953-1979, a battery factory on the Hudson River in New York released approximately 53 tons of cadmium (Cd) and nickel hydride wastes into Foundry Cove. The most common aquatic benthic species, the oligochaete Limnodrilus hoffmeisteri, rapidly evolved resistance to Cd. The capacity for detoxification and internal storage of Cd resulted in a strong potential for trophic transfer ...

Oligochaete worms are often the dominant organisms present in contaminated sediment in the field. Bioturbation, the reworking of sediments or soils by organisms, can be a significant fate and transport mechanism in contaminated sediment systems. The fate of pyrene, a polycyclic aromatic hydrocarbon, subjected to oligochaete bioturbation is the focus of this paper. Limnodrilus cervix, a represen...

We experimentally followed the life cycle of Myxobolus parviformis sp. n., a myxozoan parasite from the gills of common bream Abramis brama L. Establishing the development of both stages (myxospore and actinospore) in 2 consecutive, full transmission trials, we were able to separate plasmodia of a common genotype from sympatric Myxobolus spp. occurring in naturally infected gill lamellae. There...

Aquatic oligochaetes are very common in streams, and are used as biological assessment indicators as well as in the biological management of organic-enriched systems. In this study, we analyzed the effects of environmental factors influencing the distribution of aquatic oligochaetes Limnodrilus hoffmeisteri in streams. We used 13 environmental factors in three categories (i.e., geography, hydro...

Echinactinomyxon-type actinospores were found in a mixed-species oligochaete culture originating from the Temperate Water Fish Hatchery near Budapest, Hungary. On the basis of DNA sequence analysis, the actinospores were identified as Myxobolus pavlovskii (Akhmerov, 1954), the 18S rDNA sequence from myxospores of which is available in GenBank. Silver carp Hypophthalmichthys molitrix (Valencienn...

The present study aims at diagnosing the species of Annelida in sediment Shatt Al-Arab and studying their density. period sample collection starts from January 2021 up to May 2021. Nine stations lying on Basrah district were chosen starting Qurna station northward Al-Fao southward. included measuring some environmental factors water sediments. Water temperature ranged between 9-19, 7.2-8.6 for ...

The present study aims at diagnosing the species of Annelida in sediment Shatt Al-Arab and studying their density. period sample collection starts from January 2021 up to May 2021. Nine stations lying on Basrah district were chosen starting Qurna station northward Al-Fao southward. included measuring some environmental factors water sediments.
 Water temperature ranged between 9-19, 7.2-8....

We determined total and methyl mercury contents in soil, three earthworm species and their vomitus to study the species-specific differences of mercury bioconcentration in Huludao City, a heavily polluted region by chlor-alkali and nonferrous metal smelting industry in Liaoning Province, northeast China. Total and methyl mercury contents were 7.20 mg/kg and 6.94 ng/g in soil, 1.43 mg/kg and 43....

The objective of this study was to establish the rate at which predatory leeches consume tubificid worms, at worm population densities simulating those of Cleveland Harbor. Two common species of leeches from Lake Erie were studied, Helobdella stagnalis and Erpobdella punctata. A mixed population of tubificids, mostly Limnodrilus hojfmeisteri, Limnodrilus cervix and Peloscolex multisetosus were ...