Description
| - Three species of Labeo from Senegal were examined for presence of monogenean parasites during 2004-2007. Labeo coubie Rüppell, 1832, Labeo parvus Boulenger, 1902 and Labeo senegalensis Valenciennes, 1842 were collected by gill-nets and sink-nets from the river Gambia and its basins. Monogeneans found on the gills of freshly killed fish were fixed in a mixture of glycerine and ammonium-picrate. Morpho-metrical characteristics of the hard haptoral structures and the copulatory organ were taken using a light microscope equipped with phase contrast optics and digital image analysis. Twenty species (two new) belonging to Dactylogyrus Diesing, 1850 and Dogielius Bychowsky, 1936 (Dactylogyridae) were found: Dactylogyrus cyclocirrus Paperna, 1973, D. decaspirus Guégan, Lambert, Euzet, 1988, D. falcilocus Guégan, Lambert, Euzet, 1988, D. jaculus Guégan, Lambert, Euzet, 1988, D. jucundus Guégan, Lambert, 1991, D. oligospirophallus Paperna, 1973, D. titus Guégan, Lambert, Euzet, 1988, Dactylogyrus sp.
- Three species of Labeo from Senegal were examined for presence of monogenean parasites during 2004-2007. Labeo coubie Rüppell, 1832, Labeo parvus Boulenger, 1902 and Labeo senegalensis Valenciennes, 1842 were collected by gill-nets and sink-nets from the river Gambia and its basins. Monogeneans found on the gills of freshly killed fish were fixed in a mixture of glycerine and ammonium-picrate. Morpho-metrical characteristics of the hard haptoral structures and the copulatory organ were taken using a light microscope equipped with phase contrast optics and digital image analysis. Twenty species (two new) belonging to Dactylogyrus Diesing, 1850 and Dogielius Bychowsky, 1936 (Dactylogyridae) were found: Dactylogyrus cyclocirrus Paperna, 1973, D. decaspirus Guégan, Lambert, Euzet, 1988, D. falcilocus Guégan, Lambert, Euzet, 1988, D. jaculus Guégan, Lambert, Euzet, 1988, D. jucundus Guégan, Lambert, 1991, D. oligospirophallus Paperna, 1973, D. titus Guégan, Lambert, Euzet, 1988, Dactylogyrus sp. (en)
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