A. O. Kovalevsky Institute of Biology of the Southern Seas of RAS, 2 Nakhimov Av., 299011, Sevastopol, Russian Federation.
Papanin Institute for Biology of Inland Waters Russian Academy of Sciences, Yaroslavl region, Borok, 152742, Nekouz District, Russian Federation.
Parasitol Res. 2022 Oct;121(10):2927-2943. doi: 10.1007/s00436-022-07620-6. Epub 2022 Aug 16.
In March and April 2018, we carried out a survey of myxosporean parasites in coastal fishes collected from Nha Trang Bay in Vietnam's East Sea. Of the 159 fish specimens, 18 fish species were represented, belonging to 10 families. In 8 host species, 7 myxosporean species were found, representing the genera Kudoa and Unicapsula. Two of these species were new to science: Kudoa igori n. sp. from the gallbladder of Longarm mullet Osteomugil cunnesius (Valenciennes, 1836) (prevalence 10%) and Kudoa borimiri n. sp. from skeletal muscles of Longarm mullet and Longfinned mullet Osteomugil perusii (Valenciennes, 1836) (prevalence 30% and 60%, respectively). Vegetative stages were not found. Spores of K. igori n. sp. were small, orbicular to quadrate in apical view, and with four equal valves. In lateral view, spores were shallowly ovoid with a slightly protruding anterior pole. The 4 polar capsules were slightly unequal sizes and were oriented toward the apex of the spore. Dimensions were as follows: spore length 4.56 ± 0.22 (4.18-4.56), thickness 4.42 ± 0.39 (3.55-5.13), width 5.74 ± 0.46 (4.66-6.50), length of biggest polar capsule 1.38 ± 0.14 (1.1-1.65), middle 1.28 ± 0.12 (1.03-1.53), smallest 1.13 ± 0.11 (0.94-1.30), width of biggest polar capsule 1.03 ± 0.14 (0.83-1.4), middle 0.92 ± 0.12 (0.76-1.08), smallest 0.74 ± 0.12 (0.55-0.94). Spores of K. borimiri n. sp. had four equal valves with slightly rounded ends and were quadrate in apical view. In lateral view, spores were broadly deltoid. Four equal-sized polar capsules opened at the apex of the spore. In O. cunnesius, spore dimensions were as follows: length 3.51 ± 0.15 (3.34-3.92), thickness 3.65 ± 0.38 (2.79-4.21), width 4.97 ± 0.37 (4.13-5.97), length of the polar capsules 1.23 ± 0.18 (0.99-1.57), width 0.88 ± 0.07 (0.70-1.00). Overlapping dimensions for K. borimiri n. sp. spores were also found in O. perusii. Other known myxozoan species we encountered were Kudoa thyrsites and Kudoa whippsi, which had not previously been reported from the East Sea and Vietnam. We also encountered Kudoa monodactyli, which had not previously been reported from Nha Trang Bay. In addition, we report 2 additional species, a Kudoa sp. and a Unicapsula sp., that were not attributable to previously described myxozoans and need further investigation to completely characterize.
2018 年 3 月至 4 月，我们对从越南东海芽庄湾采集的沿海鱼类中的粘孢子虫寄生虫进行了调查。在 159 个鱼类标本中，有 18 种鱼类，属于 10 个科。在 8 种宿主物种中，发现了 7 种粘孢子虫，代表了 Kudoa 和 Unicapsula 属。其中有两种是新发现的物种：从长臂鲻鱼 Osteomugil cunnesius（Valenciennes，1836）的胆囊中发现的 Kudoa igori n. sp.（流行率 10%）和从长臂鲻鱼和长鳍鲻鱼 Osteomugil perusii（Valenciennes，1836）的骨骼肌中发现的 Kudoa borimiri n. sp.（流行率分别为 30%和 60%）。未发现营养体阶段。K. igori n. sp. 的孢子较小，在顶端视图中呈圆形到方形，有四个相等的瓣。在侧视图中，孢子呈浅卵形，前极略微突出。四个极囊大小略有不同，朝向孢子的顶端。尺寸如下：孢子长度 4.56±0.22（4.18-4.56），厚度 4.42±0.39（3.55-5.13），宽度 5.74±0.46（4.66-6.50），最大极囊长度 1.38±0.14（1.1-1.65），中间 1.28±0.12（1.03-1.53），最小 1.13±0.11（0.94-1.30），最大极囊宽度 1.03±0.14（0.83-1.4），中间 0.92±0.12（0.76-1.08），最小 0.74±0.12（0.55-0.94）。K. borimiri n. sp. 的孢子有四个相等的瓣，末端略圆，在顶端视图中呈方形。在侧视图中，孢子呈宽三角形。四个大小相等的极囊在孢子的顶端打开。在 O. cunnesius 中，孢子尺寸如下：长度 3.51±0.15（3.34-3.92），厚度 3.65±0.38（2.79-4.21），宽度 4.97±0.37（4.13-5.97），极囊长度 1.23±0.18（0.99-1.57），宽度 0.88±0.07（0.70-1.00）。在 O. perusii 中也发现了与 K. borimiri n. sp. 孢子重叠的尺寸。我们遇到的其他已知粘孢子虫物种是 Kudoa thyrsites 和 Kudoa whippsi，它们以前没有在东海和越南报道过。我们还遇到了 Kudoa monodactyli，它以前没有在芽庄湾报道过。此外，我们报告了另外 2 个种，一个 Kudoa sp. 和一个 Unicapsula sp.，它们不能归因于以前描述的粘孢子虫，需要进一步调查以完全确定其特征。
