Study of Myxosporea (Myxozoa), infecting worldwide mullets with description of a new species

Yurakhno, Violetta; Ovcharenko, Mykola

doi:10.1007/s00436-014-4031-5

Cited by 30 publications

(21 citation statements)

References 34 publications

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“…Myxosporean species infecting mullets worldwide amount to 64, according to the last counting, and, from these, 32 are Myxobolus species (Yurakhno and Ovcharenko 2014). Only 31% of the mullets infecting Myxobolus have DNA sequences published in GenBank, and surely, many new species are yet to be discovered.…”

Section: Discussionmentioning

confidence: 99%

Description of new types of sphaeractinomyxon actinospores (Myxozoa: Myxosporea) from marine tubificid oligochaetes, with a discussion on the validity of the tetraspora and the endocapsa as actinospore collective group names

et al. 2016

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Ten new types of sphaeractinomyxon actinospores are morphologically and molecularly described from the coelomic cavity of two marine oligochaete hosts, Hrabě, 1967 and Tubificoides pseudogaster (Dahl, 1960), from Aveiro 2 estuary, Portugal. The smallest sphaeractinomyxon type measured 17 µm (length) × 19 µm (width) × 19 µm (apical diameter), whereas the largest type measured 61 µm × 76 µm × 80 µm. While considering the ten types of sphaeractinomyxon, it was found that the number of spores developing inside pansporocysts varied between one, two, four and eight. The total prevalence of infection was of 19% for the two host species, with a maximum recorded for spring and summer (25-26%). While considering each type of sphaeractinomyxon individually, it was found that the prevalence values ranged between 0.3 and 1.7%. All described sphaeractinomyxons were most similar to mugilids infecting Myxobolus species. Limnodriloides agnesThe validity of the tetraspora and endocapsa collective group names is discussed.

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Section: Discussionmentioning

confidence: 99%

Description of new types of sphaeractinomyxon actinospores (Myxozoa: Myxosporea) from marine tubificid oligochaetes, with a discussion on the validity of the tetraspora and the endocapsa as actinospore collective group names

et al. 2016

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“…To date, 51 species of Myxobolus have been reported from mugiliform hosts worldwide (see Marcotegui and Martorelli, 2017; Cardim et al ., 2018; Rocha et al ., 2019 d , 2019 e ). Of these, 20 are known to occur in the Iberian Peninsula, parasitizing mullets that were either captured from the estuary of the River Minho in northern Portugal (Rocha et al ., 2019 d , 2019 e ), or from the Spanish Mediterranean coast (Yurakhno and Ovcharenko, 2014; Sharon et al ., 2019). This includes M. mugiliensis , M. labrosus and the Myxobolus sp., which life cycles are clarified in this study.…”

Section: Discussionmentioning

confidence: 99%

Involvement of sphaeractinomyxon in the life cycle of mugiliform-infecting Myxobolus (Cnidaria, Myxosporea) reveals high functionality of actinospore morphotype in promoting transmission

et al. 2020

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Four new actinospore types belonging to the sphaeractinomyxon collective group (Cnidaria, Myxosporea) are described from the coelomic cavity of a marine Baltidrilus sp. (Oligochaeta, Naididae) inhabiting a northern Portuguese estuary. Host identification supports the usage of marine oligochaetes, namely of the family Naididae Ehrenberg, 1828, as definitive hosts for myxosporeans inhabiting estuarine/marine environments. The absence of mixed infections in the host specimens analysed is suggested to reflect the influence of host-, parasite- and environmental-related factors regulating myxosporean–annelid interactions. Molecular analyses matched the SSU rDNA sequences of three of the four new types with those of mugiliform-infecting Myxobolus spp., namely Myxobolus mugiliensis and a Myxobolus sp. from flathead grey mullet Mugil cephalus, and Myxobolus labrosus from thicklip grey mullet Chelon labrosus. These results directly link, for the first time, the sphaeractinomyxon collective group to a myxospore counterpart, further confirming their previously hypothesized specific involvement in the life cycle of myxobolids that infect mullets. Acknowledging this life cycle relationship, the functionality of the sphaeractinomyxon morphotype is suggested to have been decisive for the evolutionary hyperdiversification of the genus Myxobolus in mullets. Unlike other actinospore morphotypes, sphaeractinomyxon lack valvular processes, which implies a limited capability for buoyancy. Considering the benthic-feeding nature of mullets, this feature is most likely crucial in promoting successful transmission to the vertebrate host.

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“…Sphaerospora dicentrarchi впервые описана из жёлчного и плавательного пузыря, кишечника, желудка, почек, селезёнки, поджелудочной железы, гонад и серозной оболочки лаврака Dicentrarchus labrax в Средиземном море [17]. Позднее этот вид был найден в жёлчном пузыре, кишечнике, почках кефалевых рыб в Чёрном, Азовском и Средиземном морях [5,16,20], а также в Восточной Атлантике [5]. Кефалевая форма S. dicentrarchi отличается от формы из лаврака несколько большей длиной и меньшей толщиной спор, а также большей длиной полярных капсул.…”

Section: Myxobolus Spinacurvaturaunclassified

“…Для оценки численности паразитов использовали стандартные показатели -экстенсивность (ЭИ) и интенсивность (ИИ) инвазии [7]. Myxobolus spinacurvatura ранее был найден в том же хозяине -лобане -в Средиземном, Чёрном, Азовском, Японском морях и в Тихом океане у берегов Австралии и Японии [20]. Места локализации -кишечник, печень, жёлчный пузырь, селезёнка, мезентерий, мозг, печень, поджелудочная железа, жабры.…”

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Первые Данные О двустворчатых Миксоспоридиях Кефалевых Рыб Залива Нячанг (Вьетнам)

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2019

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Mullets are objects of fishery in Vietnam; some of them are raised in rice paddies. Intensive development of fish mariculture in this country, as well as a large proportion of hydrobionts in the population diet, requires knowledge not only of the species composition of parasites, but also of their life cycles, pathogenicity, medical and epizootiological significance. The fauna of marine myxosporeans in this area has been studied very poorly. Totally 36 species of Myxosporea in freshwater fishes of Vietnam are known and 10 are not identified; 7 species of myxosporeans are found in marine fishes and 9 are not identified. In March – April of 2018 in the Nha Trang Bay (Vietnam, South China Sea, which the Vietnamese call the East Sea) 71 specimens of 7 species of Mugilidae fish were examined for identifying myxosporeans by the method of incomplete parasitological autopsy (4 specimens Chelon planiceps, 25 specimens Valamugil speigleri, 10 specimens V. formosae, 1 specimen Planiliza subviridis, 19 specimens Paramugil parmatus, 9 specimens Mugil cephalus, 3 specimens Moolgarda seheli). All organs were examined under Olympus SZ61 binocular microscope at magnification from ×15 to ×25. Smears from the tissues of various fish organs were examined under Olympus CKX53 microscope with phase contrast at magnification ×400 and under Olympus CX41 microscope with the Olympus SC50 digital camera and phase contrast at magnification ×800. Myxosporeans were fixed in glycerol-gelatin according to the standard technique. Parasite measurements were based on 20 Myxobolus spinacurvatura spores, 25 Sphaerospora dicentrarchi spores, and 10 Henneguya sp. spores. All measurements were carried out by the standard method. To assess the number of parasites, data on prevalence and intensity of invasion were used. The first data on Bivalvulida myxosporeans of Mugilidae fish in Nha Trang Bay were obtained: Myxobolus spinacurvatura was found in the gallbladder and intestine of 78 % Mugil cephalus with the intensity of invasion of unit spores in the gallbladder smear and 5–11 cysts in the intestine; Sphaerospora dicentrarchi was found in the gallbladder of 5 % Paramugil parmatus, 12 % Valamugil speigleri, 20 % V. formosae and 56 % Mugil cephalus with the intensity of invasion of unit spores in the smear; Henneguya sp. was found in the gallbladder of 8 % V. speigleri and 10 % V. formosae with the intensity of invasion of unit, tens of spores in the smear. Description of the revealed species was made. Their distribution in other regions of the World Ocean was considered. S. dicentrarchi turned out to be a new species for the fauna of the East Sea and Vietnam. This species was found not only in Mugil cephalus, the typical host in other regions, but also in new hosts Paramugil parmatus, Valamugil speigleri, and V. formosae. Myxobolus spinacurvatura was first found in the Nha Trang Bay. Since Myxobolus spinacurvatura and Sphaerospora dicentrarchi are known in Mugil cephalus not only in the Pacific Ocean basin but also in the Atlantic Ocean one, taking into account the connection of these water bodies in ancient times, it is assumed that each of these parasites had a common large distribution area in the past, which was then broken due to powerful geological transformations of our planet.

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Study of Myxosporea (Myxozoa), infecting worldwide mullets with description of a new species

Cited by 30 publications

References 34 publications

Description of new types of sphaeractinomyxon actinospores (Myxozoa: Myxosporea) from marine tubificid oligochaetes, with a discussion on the validity of the tetraspora and the endocapsa as actinospore collective group names

Description of new types of sphaeractinomyxon actinospores (Myxozoa: Myxosporea) from marine tubificid oligochaetes, with a discussion on the validity of the tetraspora and the endocapsa as actinospore collective group names

Involvement of sphaeractinomyxon in the life cycle of mugiliform-infecting Myxobolus (Cnidaria, Myxosporea) reveals high functionality of actinospore morphotype in promoting transmission

Первые Данные О двустворчатых Миксоспоридиях Кефалевых Рыб Залива Нячанг (Вьетнам)

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