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• W3034972622 abstract "Full French Title: Effets de la frequence de nourrissage sur les parametres zootechniques et le taux de masculinisation des larves de la souche « Bresil » du tilapia du nil Oreochromis niloticus (Linnee, 1758) pendant et apres le traitement avec le 17- α -methyltestosteroneEn larviculture la survie et la croissance peuvent etre influencees par divers parametres parmi lesquels la frequence d’alimentation. L’effet de ce parametre sur les larves de la souche « Bresil » du tilapia du Nil Oreochromis niloticus au cours de la periode de traitement (5, 6, 7 et 8 repas / jour) et post-traitement (3, 4, 5 et 6 repas / jour) avec le 17-α -methyltestosterone a ete teste. La duree de chacune des periodes a ete de 21 jours. La ration quotidienne distribuee a ete etablie sur la base du poids moyen initial avec un taux d’alimentation de 50 % de la biomasse par jour, ce dernier a ete ajuste chaque semaine en fonction de la croissance des poissons. Apres les 21 jours de la periode de traitement hormonale, les meilleures performances de croissance (411,33 ± 21,19 mg) ont ete enregistrees chez les larves nourries 6 fois par jour. Les plus fortes croissances (1617,44 ± 90,34 mg) au cours de la periode post-traitement ont ete obtenues chez les alevins ayant recu 5 repas par jour. Les frequences de nourrissage de 6 et 5 repas quotidiens sont donc optimales respectivement en periode de traitement et post- traitement avec le 17-α -methyltestosterone. Concernant, le taux de masculinisation, les poissons nourris aux frequences de 6, 7 et 8 repas par jour ont obtenues des valeurs similaires mais superieurs (p-value < 0,05) a celle de la frequence de 5 repas par jour. Ainsi, pour obtenir un pourcentage eleve de mâle lors de l’inversion hormonale du sexe chez le tilapia du Nil en milieu d’elevage, une frequence d’au moins 6 repas par jour est recommandee.Mots cles: Oreochromis niloticus, frequence d’alimentation, Post-traitement, larves, parametres zootechniquesEnglish Title: Effects of feeding frequency on zootechnical parameters and masculinization rate of Oreochromis niloticus (Linnaeus, 1758) «Brazil» strain larvae during and after the treatment with 17-alpha-methyltestosteroneEnglish AbstractIn larval culture the survival and growth can be influenced by various parameters of which the feeding frequency. The effect of this parameter on ‘’ Brazil ‘’ strain larvae of Nile tilapia Oreochromis niloticus during (5, 6, 7 and 8 meals / day) and after (3, 4, 5 and 6 meals / day) 17-α -methyltestosterone treatment, was tested. The duration of each period was 21 days. The daily ration distributed was 50% of the biomass during the first week. It was adjusted for total biomass at the end of each control fishery. After the 21 days of the hormonal treatment period, the best growth performances (411.33 ± 21.19 mg) were recorded in the larvae fed 6 times per day. The highest growth (1617.44 ± 90.34 mg) after treatment was obtained in fry fed 5 meals per day. The feeding frequencies of 6 and 5 daily meals are therefore optimal during treatment and aftertreatment with 17- α-methyltestosterone respectively. Concerning the masculinization rate, fish fed at the frequencies of 6, 7 and 8 meals per day obtained similar values but higher (p-value < 0.05) than the frequency of 5 meals per day. A feeding of at least 6 meals per day is recommended during the inversion of the sex in the larvae of the ‘’ Brazil ‘’ strain of Nile tilapia in breeding environment. Regarding the rate of masculinization, fish fed at frequencies of 6, 7 and 8 meals per day obtained similar but higher values (p-value < 0.05) than the frequency of 5 meals per day. Thus, to obtain a high percentage of males during the hormonal inversion of sex in the Nile tilapia in the rearing environment, a frequency of at least 6 meals per day is recommended.Keywords: Oreochromis niloticus, feeding frequency, post-treatment, larvae, zootechnical parameters" @default.
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• W3034972622 date "2019-01-01" @default.
• W3034972622 modified "2023-09-23" @default.
• W3034972622 title "Effets de la frequence de nourrissage sur les parametres zootechniques et le taux de masculinisation des larves de la souche « Bresil » du tilapia du nil Oreochromis niloticus (Linnee, 1758) pendant et apres le traitement..." @default.
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