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En Cote d’Ivoire, l’elevage en milieu lagunaire a du mal a prendre son envol du fait du manque de poisson interessant au plan zootechnique. En vue de rechercher une bonne espece a potentialite piscicole, deux souches pures de tilapia (Oreochromis niloticus et Sarotherodon melanotheron) et leurs hybrides (♀ S. melanotheron x ♂ O. niloticus et ♀ O. niloticus x ♂ S. melanotheron) ont ete etudiees en phase de grossissement en cages. Ainsi, deux cent quarante (240) poissons issus d’un pregrossissement en bacs en beton avec des poids moyens initiaux compris entre 33,60 ± 2,11g et 70,25 ± 2,20g ont ete repartis en 8 lots a raison de deux lots par type de croisement. Ces poissons ont ete suivis pendant six (6) mois durant lesquels ils ont recu quotidiennement un aliment titrant 30% de proteines. Les resultats relatifs aux performances de croissance ont revele que les hybrides issus du croisement ♀ O. niloticus x ♂ S. melanotheron ont une croissance (0,70 ± 0,02g/j) superieure a celles des hybrides de ♀ S. melanotheron x ♂ O. niloticus (0,45 ± 0,01g/j) et de S. melanotheron (0,37 ± 0,03 g/j). La croissance de O. niloticus a ete la meilleure (1,22 ± 0,01g/j). Quant a la survie, les hybrides et leurs parents S. melanotheron ont enregistre un taux superieur a celui de O. niloticus (100% contre 83,33%). Ces resultats suggerent que les hybrides ont une adaptabilite aux milieux lagunaires comparable a celle de S. melanotheron. L’ hybride issus du croisement ♀ O. niloticus x ♂ S. melanotheron qui a mieux herite de la resistance au milieu lagunaire de S. melanotheron ainsi que de la bonne croissance de O. niloticus, se presente comme le meilleur choix pour une pisciculture lagunaire a grande echelle.Mots cles : Tilapias, Croissance, survie, lagune. English Title: Zootechnical performances of males of Oreochromis niloticus (Linne, 1758), Sarotherodon melanotheron (Ruppell, 1853) and their hybrids in growth phase in cages installed in pondIn Ivory Coast, the breeding in lagoon environment has difficulty to take off because of the lack of interesting fish at the zootechnical level. In order to identify a potential candidate species for fish farming in brackish water, two pure strains of tilapia (Oreochromis niloticus and Sarotherodon melanotheron) and their hybrids (♀ S. melanotheron x ♂ O. niloticus and ♀ O. niloticus x ♂ S. melanotheron) were studied in the growth phase in cages. Thus, two hundred and forty (240) fish from a pregrowth in concrete tanks with initial average weights between 33.60 ± 2.11g and 70.25 ± 2.20g were divided into 8 lots at the rate of two lots by type of crossing. These fish were followed for six (6) months during which they received daily food containing 30% protein. The results relating to the growth performances revealed that the hybrids resulting from the crossing ♀ O. niloticus x ♂ S. melanotheron have a growth (0.70 ± 0.02 g/d) higher than those of the hybrids of ♀ S. melanotheron x ♂ O. niloticus (0.45 ± 0.01 g/d) and S. melanotheron (0.37 ± 0.03 g/d). The growth of O. niloticus was the best (1.22 ± 0.01 g/d). As for survival, the hybrids and their parents S. melanotheron recorded a higher rate than that of O. niloticus (100% against 83.33%). These results suggest that the hybrids have good adaptability to the lagoon environment like S. melanotheron. The hybrid from the cross ♀ O. niloticus x ♂ S. melanotheron, which has better inherited the resistance to the lagoon environment of S. melanotheron as well as the good growth of O. niloticus, is the best choice for lagoon fish farming. in large scale.Keywords: Tilapias, growth, survival, lagoon.

international journal of biological and chemical sciences

Performances zootechniques des mâles de &lt;i&gt;Oreochromis niloticus&lt;/i&gt; (Linné, 1758), &lt;i&gt;Sarotherodon melanotheron&lt;/i&gt; (Rüppell, 1853) et leurs hybrides en phase de grossissement en cages installées en étang