Prevalence and spatial distribution of the ectoparasites on the gills of Mystus vittatus from River Penna flowing throug
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ORIGINAL ARTICLE
Prevalence and spatial distribution of the ectoparasites on the gills of Mystus vittatus from River Penna flowing through YSR District, Andhra Pradesh, India Asha Kiran Modi1 • Anu Prasanna Vankara1
Received: 3 April 2020 / Accepted: 12 September 2020 Ó Indian Society for Parasitology 2020
Abstract A parasitic survey was performed during July 2017 to February 2018 to emphasize the prevalence and spatial distribution of ectoparasites in Mystus vittatus from three sampling sites of River Penna flowing through YSR District, Andhra Pradesh by routine parasitological procedures. A total of 238 ectoparasites were obtained from the gills of 70 examined fishes with a prevalence of 77.1%, mean intensity of 4.4 and mean abundance of 3.4 respectively. Three species of ectoparasites i.e., two monogeneans—Cornudiscoides vittati (n = 119); Bifurcohaptor indicus (n = 90) and one copepod, Lamproglena hospetensis (n = 29) were obtained from the gills of the host. All the 3 species of gill ectoparasites showed an aggregated distribution pattern (2.92, 2.52 and 2.83). Only, B. indicus showed a significant positive relationship between the condition factor and parasitic abundance (rs = 0.361, p = 0.0021) followed by C. vittati (rs = 0.206, p = 0.086) whereas the parasitic abundance of L. hospetensis (rs= - 0.213, p = 0.076) showed a weak negative correlation with the relative condition factor of the host. Parasitization was analyzed location wise and fishes collected from Site-I (Mylavaram) were highly infected with both the monogeneans while parasitization with copepods was nil. However, the parasitization of copepods was relatively higher in Site-II (Chennur). There was no influence of host size and host sex on the parasitization and also no specific preference for the sides of the fish host. The
& Anu Prasanna Vankara [email protected]; [email protected]; http://livedna.org/91.16872 1
Department of Zoology, Yogi Vemana University, YSR District, Andhra Pradesh 516005, India
monogeneans segregated the niche to prevent resource competition i.e., C. vittati and L. hospetensis were prevalent in gill arches II and I respectively whereas B. indicus occupied gill arch III. Both the monogeneans showed very a high interspecific association (rj = 0.96) with each other but showed a very negligible association with L. hospetensis. This type of study will help the aquaculturists to implement many advanced management strategies in aquaculture and improve the yield of Mystus vittatus in the Southern states of India. Keywords Cornudiscoides vittati Bifurcohaptor indicus Lamproglena hospetensis Mystus vittatus Spatial distribution
Introduction Mystus vittatus (striped dwarf catfish) commonly known as ‘tengra’ in India is a species of catfish family: Bagridae mostly inhabiting the brackish water systems with marginal vegetation in lakes and swamps of Asian countries such as India, Pakistan, Sri Lanka, Nepal, Bangladesh and probably Myanmar and reaches a length of 21 cm in maximum (Froese and Pauly
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