Abstract
In the present study, new host and locality records of Cucullanus aliyaii Akhtar and Mujib (2012), a cuculanid nematode isolated from the intestine of the rabbitfish, Siganus canaliculatus collected from the Red Sea, coasts of Hurghada city, Egypt during the period from January to September 2017. Fifteen out of 55 (27.3%) of the examined fish were infected. Worms were recorded by naked eyes on the flesh, stomach, intestines, as well as body cavities of the infected fish. Light and scanning electron microscopy revealed that the isolated worms possessed the important criteria characteristic for members of family Cuculanidae: dimensions of oesophagus, spicules, mucron, size of pseudobuccal capsule, eggs, the position of deirids, excretory pore and vulva, numbers and arrangement of caudal papillae, host groups and zoogeographical regions. The recorded parasite was whitish and small-sized, female worms were 9.40±2 (7.4-10.3) x 2.5±0.2 (2.00-2.60) mm while male worms were 6.30±0.02 (6.00-8.30) mm x 1.60±0.02 (1.59-1.73) mm. Oral aperture was dorsoventrally elongate, slit-like, surrounded by distinct collarette, beared one row of small denticles on its inner surface; four submedian cephalic papillae and a pair of prominent lateral amphids present. Oesophagus was of two distinct portions: anterior pseudobuccal capsule measured 0.50±0.02 (0.47-0.053) mm in length, narrowing immediately below nerve ring; and posterior with a club-shaped muscular structure measured 0.45±0.02 (0.41-0.49) mm in length
Highlights
Nematodes represent the most frequent and the most important parasites of fishes in the freshwater, brackish-water and marine environments throughout the world (Moravec, 2007)
Adult nematodes are found in the intestine of fish, while larval stages are sometimes found on the flesh and viscera causing severe diseases and economical losses (Moravec et al, 2005, Timi & Lanfranchi, 2006 and Moravec et al, 2008)
Esophagus consisted of two distinct portions: anterior end with sclerotized lining expanded anteriorly to form a pseudobuccal capsule, narrowed immediately below the nerve ring; while the posterior end was muscular with a claviform aspect and opened into the intestine through valves
Summary
Nematodes represent the most frequent and the most important parasites of fishes in the freshwater, brackish-water and marine environments throughout the world (Moravec, 2007). Adult nematodes are found in the intestine of fish, while larval stages are sometimes found on the flesh and viscera causing severe diseases and economical losses (Moravec et al, 2005, Timi & Lanfranchi, 2006 and Moravec et al, 2008). The larval stages are infective to humans and have the greatest impact on consumer acceptance of fish as a source of protein Includes over 100 nominal parasitic species in marine and freshwater fishes, and in aquatic turtles (Dick & Choudhury, 1995, Costa et al, 2004, Moravec et al 2005, 2007, Timi & Lanfranchi 2006 and Kinoshita et al 2014). During a recent survey on parasitic helminths infecting marine fishes, nematode parasites were isolated from the rabbitfish
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