Pojava parazitskih mirkrosporidija (Microsporidia) na četiri vrste riba iz porodice Carangidae u obalnom području Senegala

Hepatic microsporidiosis was observed in four species of carangid fishes from the Senegalese coast. Being unable to positively identify the parasitic species, we provisionally placed them in the collective group Microsporidium Balbiani, 1984. The Microsporidium found in Caranx crysos and Caranx senegallus was labeled sp1, that found in Selene dorsalis was called sp2, and that found in Trachurus trachurus was called sp3. The Microsporidia formed cysts (xenomas) in the hepatic tissues of their hosts.U obalnim vodama Senegala zabilježena je na 4 vrste riba mikrosporidioza jetre. Privremeno su parazitske vrste svrstane u zajedničku skupinu, Microsporidium Balbiani, 1984. Microsporidium u ribama Caranx crysos i C. senegallus nazvan je sp1, u ribi Selene dorsalis, sp2, a Microsporidium u ribi Trachurus trachurus predstavlja sp3. Microsporidia stvaraju ciste u jetrenim tkivima svojih domaćina

Pronalazak nametnika Myxobolus episquamalis (Myxozoa, Myxobolidae) kod cipla glavaša, Mugil cephalus (Pisces, Teleostei, Mugilidae) u Senegalskom priobalju (istočni tropski Atlantik)

Myxobolus episquamalis (Myxozoa, Myxobolidae), a myxosporidian parasite, was found for the first time infecting scales and fins of flathead mullet (Mugil cephalus) from the Senegalese coast. The overall prevalence of infection was 4.7% (25/529), while the highest infection rates were observed in January 2006 (17.1%) and July 2006 (13.9%). This parasite forms large and white cysts which cover a great part of the fish body. According to this new report from African Atlantic coast, Myxobolus episquamalis geographical distribution is extended considerably. However, the infection is of little commercial importance and does not cause a significant economic loss in Senegal.Myxobolus episquamalis (Myxozoa, Myxobolidae), mikrosporidijski nametnik, pronađen je po prvi put u cipla glavaša (Mugil cephalus) u senegalskom priobalju. Sveukupna prevalencija infekcije iznosila je 4.7% (25/529), dok je najveća stopa infekcije zabilježena u siječnju (17.1%) i srpnju (13.9%) 2006 godine. Ovaj nametnik stvara velike bijele ciste koje pokrivaju veliki dio tijela ribe. Prema ovom nalazu s afričke obale Atlantika, njegova zemljopisna rasprostranjenost je znatna. Ipak, infekcija nema veći gospodarski značaj tj. ne uzrokuje značajan ekonomski gubitak u ribarstvu Senegala

Ultrastructure and development of Nosema podocotyloidis n. sp. (Microsporidia), a hyperparasite of Podocotyloides magnatestis (Trematoda), a parasite of Parapristipoma octolineatum (Teleostei).

International audienceNosema podocotyloidis n. sp. (Microsporidia, Nosematidae) is described from Podocotyloides magnatestis (Trematoda: Opecoelidae), a parasite of the fish Parapristipoma octolineatum (Teleostei) in the Atlantic Ocean. Electron microscopy reveals that all the stages of the cycle (merogony and sporogony) are diplokaryotic and in direct contact with the cytoplasm of host cells. There is no sporophorous vesicle (pansporoblast). The earliest stages observed are meronts, which have a simple plasmic membrane. Their cytoplasm is granular, rich in ribosomes and contains some sacculi of endoplasmic reticulum. They divide by binary fission into diplokaryotic sporonts. The sporonts have a thick electron-dense wall. Their diplokaryon is slightly less electron-dense than the cytoplasm. The cytoplasm of more advanced sporonts has numerous electron-lucent vesicles. Sporonts with two diplokarya divide by binary fission into diplokaryotic sporoblasts. The older sporoblasts are irregular or elongate and the polar filament is in formation. Their cytoplasm is denser, with ribosomes and lamellae of granular endoplasmic reticulum. The sporoblasts evolve into spores. The mature spores are broadly oval and measure 3.6 (3.1-4.0) × 2.58 (1.8-3.3) μm. Their wall is 100-300 nm thick. The polar tube is isofilar with 11-16 coils, 130-155 nm in diameter and arranged in many layers in the centre of the spore. The polaroplast is divided into two regions: an outer electron-dense cup with granular content and lacking lamellae and an internal region, less electron-dense, composed of irregularly arranged sacs. The posterior vacuole, with an amorphous electron-dense content, is present. The new species is compared with other species of Nosema from trematodes

Ultrastructure and development of Nosema podocotyloidis n. sp. (Microsporidia), a hyperparasite of Podocotyloides magnatestis (Trematoda), a parasite of Parapristipoma octolineatum (Teleostei)

Nosema podocotyloidis n. sp. (Microsporidia, Nosematidae) is described from Podocotyloides magnatestis (Trematoda: Opecoelidae), a parasite of the fish Parapristipoma octolineatum (Teleostei) in the Atlantic Ocean. Electron microscopy reveals that all the stages of the cycle (merogony and sporogony) are diplokaryotic and in direct contact with the cytoplasm of host cells. There is no sporophorous vesicle (pansporoblast). The earliest stages observed are meronts, which have a simple plasmic membrane. Their cytoplasm is granular, rich in ribosomes and contains some sacculi of endoplasmic reticulum. They divide by binary fission into diplokaryotic sporonts. The sporonts have a thick electron-dense wall. Their diplokaryon is slightly less electron-dense than the cytoplasm. The cytoplasm of more advanced sporonts has numerous electron-lucent vesicles. Sporonts with two diplokarya divide by binary fission into diplokaryotic sporoblasts. The older sporoblasts are irregular or elongate and the polar filament is in formation. Their cytoplasm is denser, with ribosomes and lamellae of granular endoplasmic reticulum. The sporoblasts evolve into spores. The mature spores are broadly oval and measure 3.6 (3.1–4.0) × 2.58 (1.8–3.3) μm. Their wall is 100–300 nm thick. The polar tube is isofilar with 11–16 coils, 130–155 nm in diameter and arranged in many layers in the centre of the spore. The polaroplast is divided into two regions: an outer electron-dense cup with granular content and lacking lamellae and an internal region, less electron-dense, composed of irregularly arranged sacs. The posterior vacuole, with an amorphous electron-dense content, is present. The new species is compared with other species of Nosema from trematodes

Ultrastructure and development of

Nosema podocotyloidis n. sp. (Microsporidia, Nosematidae) is described from Podocotyloides magnatestis (Trematoda: Opecoelidae), a parasite of the fish Parapristipoma octolineatum (Teleostei) in the Atlantic Ocean. Electron microscopy reveals that all the stages of the cycle (merogony and sporogony) are diplokaryotic and in direct contact with the cytoplasm of host cells. There is no sporophorous vesicle (pansporoblast). The earliest stages observed are meronts, which have a simple plasmic membrane. Their cytoplasm is granular, rich in ribosomes and contains some sacculi of endoplasmic reticulum. They divide by binary fission into diplokaryotic sporonts. The sporonts have a thick electron-dense wall. Their diplokaryon is slightly less electron-dense than the cytoplasm. The cytoplasm of more advanced sporonts has numerous electron-lucent vesicles. Sporonts with two diplokarya divide by binary fission into diplokaryotic sporoblasts. The older sporoblasts are irregular or elongate and the polar filament is in formation. Their cytoplasm is denser, with ribosomes and lamellae of granular endoplasmic reticulum. The sporoblasts evolve into spores. The mature spores are broadly oval and measure 3.6 (3.1–4.0) × 2.58 (1.8–3.3) μm. Their wall is 100–300 nm thick. The polar tube is isofilar with 11–16 coils, 130–155 nm in diameter and arranged in many layers in the centre of the spore. The polaroplast is divided into two regions: an outer electron-dense cup with granular content and lacking lamellae and an internal region, less electron-dense, composed of irregularly arranged sacs. The posterior vacuole, with an amorphous electron-dense content, is present. The new species is compared with other species of Nosema from trematodes