A study on prevalence and intensity of Lernaea cyprinacea infestation among carp species in central laboratory of aquaculture research (Clar) hatchery, Abbassa [electronic resource].

Includes reference.

The crustacean parasites, especially lernaea species, are reported to cause serious economic problems and high mortality rates of fish hosts in carp fish hatcheries due to hemorrhage and secondary infection. The present study was conducted in Central Laboratory of Aquaculture Research (CLAR) hatchery, Abbassa, to detect the prevalence and intensity of infection by Lernaea cyprinacea among immature and mature of three carp species. The species examined were mirror carp (Cyprinus carpio), silver carp (Hypophthalmicthys molitrix) and grass carp (Ctenopharyngodon idella). A total of 450 fish were examined. The overall prevalence of infestations by Lernaea cyprinacea was 50.4%. Silver carp has the highest prevalence of Lernaea cyprinacea (62.7%), followed by grass carp (49.3%), then mirror carp (39.3%). Among the immature fish, the prevalence was high in Silver carp (72%), followed by grass carp (54%), then mirror carp (45%). Also, among the mature fish, the incidence was high in Silver carp (44%), followed by grass carp (40%), then mirror carp (28%). The highest prevalence of infestation among different parts of the fish body was observed on the tail peduncle (33.9%) followed by the belly (23%), followed by the back (22.4%) and the fins (20.7%). Among the immature fish, the intensity of infestation was high in Silver carp (3-53); followed by mirror carp (4-28), then grass carp (4-22). While, among the mature fish, the intensity was high in Silver carp (6-60); followed by grass carp (4-30), and mirror carp (10-20).

Summary in Arabic.

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