Abstract
Flathead grey mullet, Mugil cephalus, with mass whitish cystlike plasmodia on their scales were collected at Kerchensky preglass of the Black Sea in 2015. The prevalence of infected fish varied from 15% in spring, reached 100% in summer, and declined to 2.5% in autumn. No fish mortality was detected. The spores were oval in frontal view, tapering to a blunt apex. Two unequal polar capsules were pyriform and extended over the anterior half of spore. Spores were 8.2±0.03 µm (7.9-8.4) long, 5.9±0.23 µm (5.2-7.3) wide, and 4.4±0.17 µm (4.0-4.7) thick. Two pyriform and unequal polar capsules were observed (4.0±0.07 µm (3.3-4.5) long, and 1.5±0.24 µm (1.1-1.8) wide). The investigation of nucleotide sequences of the 18S rDNA gene of the myxosporean spores from scales with universal primer А (5′-ACCTGGTTGATCCTGCCAGT-3′) and В (5′-TGATCCTTCTGCAGGTTCACCTAC-3′) showed 100% identity with episquamalis, and 99 % with M. bizerti, M. ichkeulensis, M. spinacurvata and Myxobolus sp. previously detected in mullets. The results obtained from the present study reveal that M. episquamalis, found on the scales of M. cephalus from Kerchensky preglass of the Black Sea, is new record for Russian waters.
Highlights
Flathead grey mullet (Mugil cephalus, Linnaeus, 1758) (Mugilidae) is a cosmopolitan coastal species found in tropical, subtropical and temperate zones of the Atlantic, Pacific and Indian oceans, and adjacent seas, This fish is of commercial importance in both fisheries and aquaculture
Flathead grey mullet serves as a host for at least 20 representatives of the genus Myxobolus: Myxobolus achmerovi (Schulman,1966), M. bizerti (Bahari and Marques, 1996), M. bramae (Reuss, 1906), M. branchialis (Markevich, 1932), M. cephalus (Iversen et al, 1971, M. cheni (Schulman, 1962), M. circulus (Achmerov, 1960), M. episquamalis (Egusa et al, 1990), M. exiguus (Thelohan, 1895), M. goensis (Eiras & D’Souza, 2004), M. ichkeulensis (Bahri & Marques, 1996), M. lizae (Landsberg & Lom, 1991), M. muelleri (Butschli, 1882), M. mugcephalus (Narasimhamurti et al, 1980; Langsberg & Lom, 1991), M. mugilii (Haldar et al, 1996), M. nile (Eiras, Molnár, 2005), M. parvus (Schulman, 1962), M. raibauti (Fall et al, 1997), M. rohdei (Lom, Dyková, 1994), M. spinacurvatura (Maeno et al, 1990), Myxobolus sp. [1;5;7,8,9;12,13,14,15]
Nine among these twenty species of Myxobolus have been reported from flathead grey mullet in the Black Sea: M. bramae, M. branchialis, M. circulus, M. muelleri, M. exiguous, M. exiguous, M. ichkeulensis, M. mugilii, M. parvus [12] and four - in the Mediterranean Sea: M. muelleri, M. exiguus, M. ichkeulensis and M. episquamalis
Summary
Flathead grey mullet (Mugil cephalus, Linnaeus, 1758) (Mugilidae) is a cosmopolitan coastal species found in tropical, subtropical and temperate zones of the Atlantic, Pacific and Indian oceans, and adjacent seas, This fish is of commercial importance in both fisheries and aquaculture. [1;5;7,8,9;12,13,14,15] Nine among these twenty species of Myxobolus have been reported from flathead grey mullet in the Black Sea: M. bramae, M. branchialis, M. circulus, M. muelleri, M. exiguous, M. exiguous, M. ichkeulensis, M. mugilii, M. parvus [12] and four - in the Mediterranean Sea: M. muelleri, M. exiguus, M. ichkeulensis and M. episquamalis. The latter is of particular concern, because it damages fish scales, adversely affecting the appearance of a commercially important species. Myxobolus episquamalis affects three other closely related hosts: harder (Liza haematocheilus), large-scale mullet (Liza macrolepis) and thinlipped grey mullet (Liza ramada)
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