Niang, A. (2024). Contribution a l'etude des copepodes parasites de poissons Sparidae de la Baie de Soumbedioune (Dakar, Senegal). [Contribution to the study of copepod parasites of Sparidae fish from Soumbedioune Bay (Dakar, Senegal).]. M.S. Thesis, Universite Cheikh Anta Diop de Dakar, Senegal. 49 pp.

505988

Niang, A.

2024

49 pp.

Publication

Available for editors   [request]

The examination of 338 Sparidae fish collected at the Soumbedioune landing site, from June 2021 to September 2022, allowed the listing of 15 species of this family divided into 7 genera. 11 of these species were parasitized: Dentex angolensis, D. canariensis, Diplodus cadenati, D. cervinus, D. vulgaris, Pagellus belloltii, Pagrus auriga, P. caeruleostictus, Sarpa salpa, Spicara nigricauda and Spondyliosoma cantharus. In total 198 Sparidae fish individuals were parasitized. The faunistic study allowed the collection, on the gills, of 2486 parasitic Copepods belonging to four families with the following prevalences: 15.08% for Caligidae, 12.72% for Hatschekiidae, 19.23% for Lernaeopodidae and 11.53% for Lernanthropidae. The morphoanatomical study of the collected parasitic Copepods allowed the identification of 12 species, namely Caligus vexator, Caligus sp., Hatschekia pagellibogueravei, Alella pagelli, Clavellotis fallax, C. pagri, C. sargi, Naobranchia cygniformis, Parabrachiella exigua, Lernanthropus brevis, L. wilsoni and Lernanthropus sp.. The overall prevalence was 58.57%, the specific prevalence and parasite intensity of each species of parasitic Copepod were calculated. The study also highlighted the diversity of parasitic Copepods, hosts and their geographical distributions. Nine species are reported for the first time in Senegal: Caligus vexator, Caligus sp., Alella pagelli, Clavellotis fallax, C. pagri, C. sargi, Naobranchia cygniformis, Parabrachiella exigua and Lernanthropus sp.. The collected species are identified and already described except for Caligus sp. and Lernanthropus sp.. These two species show anatomical differences requiring further identification. The analysis of parasite specificity revealed oioxenous and stenoxenous parasitic Copepods, underlining their specific adaptation to Sparidae. Hatschekia pagellibogueravei was found to be well represented and confined to several Sparidae host species. Its distribution on Diplodus cervinus revealed an increase in parasitism with the size and weight of the host. The parasitic ecology of Hatschekia pagellibogueravei and Lernanthropus brevis on Diplodus cervinus, shows that the two species occupy different microhabitats at the gill biotope level. Hatschekia pagellibogueravei prefers arches I and IV Of the gill filaments while the number of Lernanthropus brevis increases from arch I to arch IV thus avoiding interspecific competition. Keywords: Bay of Soumbedioune, Caligidae, Hatschekiidae, Host fish, Lernaeopodidae, Lernanthropidae, Parasitic Copepods, Senegal, Sparidae.

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