Prevalence of Copepod Ectoparasites of Grass Carp Ctenopharyngodon idella

Tasawar, Zahida; Naseem, Rabia; Akhtar, Masood

doi:10.3923/pjbs.1999.1053.1054

Cited by 2 publications

(1 citation statement)

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“…Our study showed the highest prevalence occurred from December to January. Besides, Iqbal et al (2001b), Iqbal et al (2012), andTasawar et al (1999) detected the highest incidence of the parasite till late winter (December to April) where the water temperature remained in the range of 13-23 ºC and low parasite incidence during the summer. Ullah et al (2018) reported heavy infestation during summer and low during winter.…”

Section: Discussionmentioning

confidence: 93%

Lernaeid parasites prevalence in commercial freshwater fish species at various fish farms in Pakistan

et al. 2024

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Reports abound on Lernaea parasitizing the brood stock, fingerlings, and marketable-sized culturable freshwater fish species in various parts of the world. We investigated seven small-scale aquaculture farms and how the prevailing Lernaea is impacting them. Randomly seven fish farms were selected to determine the prevalence percentage of lernaeid ectoparasites. Relevant information of the fishponds to estimate the various aspects such as effects of water source and quality, feed, stocking density, treatment used, and weight and length of fish, concerned with Lernaea infestation and prevalence was gathered. The results indicated that Catla catla (F. Hamilton, 1822) showed highest prevalence (41.7%) among the seven fish species, whereas Oreochromis niloticus showed zero. Other five fish species Ctenopharyngodon idella, Cirrhinus cirrhosis, Cyprinus carpio, Labeo rohita and Hypophthalmichthys molitrix showed 13.2%, 8.1%, 7.7%, 7.4%, 0.9% prevalence, respectively. In Royal Fish Farm 84.3% lernaeid infestation was observed, while no parasite was observed in the Vicent’s Chunnian fish farm. The water source, quality, feed, fertilizers, stocking density, water temperature, and potential treatment options displayed varying tendencies among fish farms and prevalence. Depending on the weight and length, the highest prevalence (56.7%, and 66.7%) was observed in 3501-4000 g and 81-90 cm groups. The infestation rate varied in various fish body parts with the dorsal fin the most vulnerable organ and showed 2.3% overall prevalence (while 18.4% contribution within total 12.6% infestation). Out of 147 infected fish samples, 45 were extensively contaminated by Lernaea spread. In conclusion, our findings confirm that Lernaea could pose a considerable threat to marketable fish, and various treatment options should be educated to the farmers to help mitigate the spread and potential losses. Furthermore, Catla catla is more vulnerable to Lernaea infestation (41.7%), so are the fish species being cultured at higher stocking densities.

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Section: Discussionmentioning

confidence: 93%