Sexual Maturity Signs and Histological Alterations of Adult Oreochromis Niloticus (Linnaeus, 1758) Fed Probiotic

The accelerated growth of aquaculture industry in the past decades has resulted in environmental damages and low productivity of various aquatic organisms including fish, which seriously need for increased using of dietary probiotics in aquaculture practices. Thus, the present study was conducted to evaluate the effects of the graded levels of a newly dietary probiotic Hydroyeast Aquaculture® on morphological, anatomical of sexual maturation and histological characteristics of the gonads of both sexes of adult Nile tilapia, Oreochromis niloticus for 8 weeks. A total of 240 fish (120 males and 120 females) were separately distributed into eight homogeneous treatments as 0 (T1 , as a control), 5 (T2), 10 (T3), and 15 g Hydro yeast Aquaculture® Kg1 diet (T4) for males and the same levels of tested probiotic (T5 as a control, T6, T7, and T8) are being for females. The obtained results revealed that both fish sexes fed the different levels of tested probiotic achieved the positively effects on the gonads morphological, anatomical and histological forms compared to fish fed diet free probiotic. Based on the obtained results, it could be concluded the valuable addition of 15 g Kg1 diet (T4) and 10 g Kg1 diet (T7) of Hydroyeast Aquaculture® for adult O. niloticus males and females, respectively to enhance the morphological, anatomical of sexual maturation and histological characteristics of the gonads, which consequently lead to realize the sustainability and increase the profitability in the fish hatcheries.