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Article Dans Une Revue International Journal of Fisheries and Aquatic Studies Année : 2017

Horizontal distribution of dominant pelagic fish eggs in West African waters

Luc B. Badji
  • Fonction : Auteur
Maik Tiedemann
  • Fonction : Auteur
Heino O. Fock
  • Fonction : Auteur
Papa Ndiaye
  • Fonction : Auteur

Résumé

Early life stages of dominant West African pelagic fishes, most of which are commercially important, are rarely studied especially in Senegalese and Mauritanian coastal waters. The aim of the present study is to examine the horizontal distribution of pelagic fish eggs of Atlantic sardine (Sardina pilchardus), anchovy (Engraulis encrasicolus), sardinella (Sardinella aurita) and horse mackerels (Trachurus trachurus.) in late winter and summer. The two seasons revealed two contrasting environmental conditions. While in late winter a permanent upwelling shaped the environmental conditions, in summer a warm tropical influx of surface water towards Mauritania was observed. We collected fish eggs in both seasons along the shelf coasts of Mauritania and Senegal. These data were then related to the sea surface temperature obtained at each sampling position from a conductivity-temperature-depth (CTD) instrument. This study showed that eggs of most species are concentrated in the coastal waters in front the Banc d'Arguin, in Saint-Louis and along the Petite-côte of Senegal. Moreover, it has been shown that spatial distribution of fish eggs is controlled by several factors such as temperature and also by the role of the continental shelf-break, as a mechanism of retention of fish eggs and larvae.
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Dates et versions

hal-01929822 , version 1 (21-11-2018)

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Luc B. Badji, Maik Tiedemann, Heino O. Fock, Papa Ndiaye, Didier Jouffre. Horizontal distribution of dominant pelagic fish eggs in West African waters. International Journal of Fisheries and Aquatic Studies, 2017, 5 (6), pp.340-348. ⟨hal-01929822⟩
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