Parasitic incidence in a cyprinid fish Labeo rohita (Ham.) at river Song in Doon valley (Uttarakhand)

Abstract

On examining 144 specimens of Labeo rohita (Ham.) for parasites occurrence; as many as 34 fish were found positive to harbour ciliophorans (Trichodina sp. and Ichthyophthirius multifilis Fouquet, 1876), monogeneans (Haplocleidus vachi Tripathi, 1959 and Dactylogyrus glossogobii Jain, 1960), trematode (Allocreadium mahaseri Pandey, 1939), nematode (Camallanus (Zeylanema) anabantis Pearse, 1933) and acanthocephalan (Sachalinorhynchus sp). Highest prevalence was shown by platyhelminthes (18.75%) followed by ciliophorans (10.41%), nematode (4.16%) and acanthocephalan (2.77%) in succession. Maximum mean intensity and abundance has been shown by C. (Zeylanema) anabantis Pearse, 1933 while the monogenean H. vachi was on the 2nd rank. On the other hand, the least intensity and abundance was shown by Ichthyophthirius multifilis. The prevalence was recorded more in monsoon (52.77%) followed by post-monsoon (22.22%), summer (19.44%) and winter (8.33%) in succession. Further, the unit-wise intensity of parasites was recorded more in males than the females.

Monogenean parasites of the African catfish Clarias gariepinus from two fish farms in Calabar, Cross River State, Nigeria

“…was more abundant (46) followed by Dactylogyrus sp. (23) while M. clarii was the lowest (21). Prevalence (30%), intensity (5.08) and abundance (1.53) of monogenean parasites recorded in Farm 1 were not significantly higher (P > 0.05) than prevalence Gyrodactylus sp.…”

Investigation on parasitic infestation of Labeo rohita (Hamilton, 1822) in the south‐western region of Bangladesh

“…Additionally, the level of parasitization displayed a notable positive correlation with the size of the fish, with smaller fish showing fewer parasites, likely reflecting their feeding habits (Upadhyay et al, 2012).…”

“…This pattern can be attributed to increased food availability and higher temperatures, which prompted greater fish movement and created a more polluted environment conducive to infestation/infection. Additionally, the level of parasitization displayed a notable positive correlation with the size of the fish, with smaller fish showing fewer parasites, likely reflecting their feeding habits (Upadhyay et al., 2012 ). The findings regarding parasitic infestations align with previous studies conducted by Farhaduzzaman et al.…”

“…The delectable flavour and palatability of fish to high demand in the market, greatly enhancing their commercial value (Khan et al., 2012 ). Parasitic infestation stands as a significant concern and formidable threat within both culture systems and natural aquatic habitats, endangering fish populations and presenting a substantial obstacle to the promotion and preservation of fish health (Upadhyay et al., 2012 ).…”

Endoparasitic Infestation of the Nile Squeaker, Synodontis schall (Bloch and Schneider, 1801) from the Cross River Estuary, Nigeria

“…Prevalence (%), mean intensity and abundance were calculated according to Upadhyay et al, [28] given below:…”