Further studies on Cymothoid isopods of some fish species from lake Qarun, Egypt

Abstract

Cymothoids are obligate parasites of marine, brackish and freshwater fishes. They were considered to cause significant economic losses to fisheries through mortalities, stunting growth or damaging tissues of the infested fish. In the last 4 years, lake Qarun suffered from isopod infestation causing fish loss and marketing problems. In the present study out of 375 fish samples belonged to Mugil capito (125), Liza carinata (125) and Tilapia zilli (125) were collected from lake Qarun , El Fayoum governorate and seasonally examined for isopod infestation from the beginning of November 2015 till the end of October 2016. The study revealed the isolation of two species of isopods ; Nerocila orbignyi and Levonica redmani with total infestation rate of 32.53% (21.07% and 11.47% for Nerocila orbignyi and Levonica redmani respectively) with the highest rate recorded during summer. Histopathological study was conducted for estimating the impacts of L. redmani infestation on the affected tissues of M. capito and revealed complete sloughing of the gill lamellae with eosinophilic granular cells infiltration. The study recommended the need to develop a scientific strategy to control the parasitic isopods and prevent its spread among Egyptian water bodies.

A global review of problematic and pathogenic parasites of farmed tilapia

“…niloticus in Brazil, 601 Nerocila bivittata (Risso, 1816) and Nerocila orbignyi (Guérin‐Méneville, 1832) on wild C . zillii in Egypt, 602–604 Renocila thresherorum Williams et Bunkley‐Williams, 1980 (family Cymothoidae) on wild C . zillii from Egypt 604,605 and unidentified larval forms from the family Gnathiidae on O .…”

“…zillii in Egypt, 602–604 Renocila thresherorum Williams et Bunkley‐Williams, 1980 (family Cymothoidae) on wild C . zillii from Egypt 604,605 and unidentified larval forms from the family Gnathiidae on O . niloticus from the Philippines 13,16 .…”

Review and guide to the isopods (Crustacea, Isopoda) of littoral and sublittoral marine habitats in the Southern California Bight

“…These include one SCB record of a female and an associated juvenile collected off Corona del Mar in southern California plus a couple of records from Magdalena Bay on the southwest coast of Baja California. The species, however, has also been reported recently from the Suez Canal area of Egypt (e.g., Eman et al 2014 ; Mahmoud et al 2016 ; Ali and Aboyadak 2018 ). Given this disjunct distribution, it would be useful to perform a comprehensive morphological and molecular comparison of Eastern Pacific vs. Egyptian specimens to confirm whether they represent the same or perhaps two similar looking species of Renocila .…”

“…Body length to ~ 30.5 mm. See Williams and Williams (1980) , Brusca (1981) , Williams and Williams (1987), Espinosa-Pérez and Hendrickx (2006) , Kerstitch and Bertsch (2007) , Eman et al (2014) , Mahmoud et al (2016) , Ali and Aboyadak (2018) , and Aneesh et al (2020 , 2021 ). Note: See Endnote 5.…”