Characterization of four novel actinospore types of fish parasitic myxozoans and the occurrence of and from fish farms of Hungary.

Six distinct actinospore types were identified in the intestinal epithelium of oligochaetes collected from the Szigetbecse and Makád fish farms of Ráckeve Danube Arm Fishing Association, in Hungary. Four new types: triactinomyxon type, raabeia type, aurantiactinomyxon type 1, and aurantiactinomyxon type 2, were described morphologically and molecularly from three invertebrate host species: , and . The 18S ribosomal DNA (rDNA) analysis revealed that these new types of actinospores did not match any myxospore sequences available in GenBank.

First record and description of actinospore stages (raabeia, triactinomyxon, and aurantiactinomyxon types) of fish parasitic myxozoans from Malaysia.

During a 2-month survey in 2023 at Tasik Telabak, Terengganu, Malaysia three distinct actinospore types, namely raabeia, triactinomyxon and aurantiactinomyxon were identified in three invertebrate host species: , sp., and sp. utilizing morphometric and molecular analyses Maximum likelihood of 18S rDNA positioned the raabeia type within the clade from fish of the Order Cypriniformes, suggesting a detected actinospore has a potential life cycle development in Cypriniformes and the genus .

Morphological and molecular characterisation of two closely related species: n. sp. and Reuss, 1906.

Based on spore morphology and small subunit ribosomal DNA sequences, we describe a new species, n. sp., parasitizing the European perch () from Lake Balaton in Hungary.

The first detection of Myxobolus lentisuturalis Dyková, Fiala et Nie, 2002, a highly pathogenic muscle-infecting parasite of gibel carp (Carassius auratus gibelio Berg, 1932) in Hungary.

Myxobolus lentisuturalis is a myxosporean parasite infecting the musculature both of goldfish (Carassius auratus auratus) and gibel carp (Carassius auratus gibelio). The species was originally described in China from gibel carp that is a common fish for sport fishing in Hungary meanwhile is one of the most popular farmed fish in China due to its high demand. Eighteen gibel carp with distortions were collected from a barrage pond in southern Hungary.