Abstract
Tachaea chinensis Thielemann, 1910 (Isopoda: Corallanidae) is a branchial ectoparasite that attaches onto shrimps and prawns. However, the distribution of T. chinensis in China, especially its epidemiology, remains unclear. We determined the prevalence of T. chinensis on the ridgetail white prawn (Exopalaemon carinicauda Holthuis, 1950) in Jiangsu Province. Fifty ponds in 10 shrimp farms were assessed. Isopod species were identified by morphological features and mitochondrial 16S rRNA gene analysis. A literature review was performed to determine the geographical distribution of T. chinensis in China. Published data revealed that T. chinensis was geographically distributed throughout five provinces in China, including Liaoning, Tianjin, Henan, Hubei, and Guangxi. A total of 998 T. chinensis were collected from 50 ridgetail white prawn ponds in Yancheng City and Rudong County. Tachaea chinensis prevalence ranged from 0.98% to 4.42% in Yancheng City and 0.62% to 0.92% in Rudong County. This is the first study to investigate the geographical distribution of T. chinensis in China and determine the prevalence of T. chinensis on the ridgetail white prawn in Jiangsu Province. Overall, we provide available data that fill gaps in the epidemiology of T. chinensis.
Highlights
Tachaea chinensis Thielemann, 1910 (Isopoda: Corallanidae) is a branchial ectoparasite that attaches onto shrimps and prawns
998 T. chinensis individuals were collected from cultured ridgetail white prawn ponds in Jiangsu
The results confirmed that the isopods that were collected from Panjin, Yancheng, and Rudong were T. chinensis
Summary
Tachaea chinensis Thielemann, 1910 (Isopoda: Corallanidae) is a branchial ectoparasite that attaches onto shrimps and prawns. Corallanidae are generally considered to be fish parasites[13,14], but Tachaea spp. are thought to be ectoparasites of shrimps, with a few species being commensals of sponges. To the best of our knowledge, only a few studies have been conducted on T. chinensis in China, and it only infects the cultured white shrimp Litopenaeus vannamei and Macrobrachium spp.[16,17]. Another study reviewed the distribution of T. chinensis in Japan[22], but no report on the occurrence of this species in other regions of the world was found.
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