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Aquaculture Studies 2021, Vol 21, Num, 1     (Pages: 23-30)

Comparative Growth Performance of Genetically Male, Sex-Reversed, and Mixed-Sex Nile Tilapia (Oreochromis niloticus) Reared in Earthen Ponds in Sagana, Kenya Mary

Mary A. Opiyo 1 ,Kevin O. Obiero 2 ,Jacob Abwao 1 ,Fonda Jane Awuor 1 ,Domitila Kyule 1 ,Jonathan Munguti 1

1 Kenya Marine and Fisheries Research Institute, National Aquaculture Research Development and Training Center, P.O. Box 451-10230, Sagana, Kenya
2 Kenya Marine and Fisheries Research Institute, Sangoro Aquaculture Station, Pap-Onditi 136-40111, Kenya
DOI : 10.4194/2618-6381-v21_1_03 Viewed : 1716 - Downloaded : 1255 Nile tilapia (Oreochromis niloticus) culture has been faced by challenges of prolific breeding and early maturity of mixed-sex tilapia that can be solved by the culture of all-male tilapia. A study was conducted to compare the growth performance, survival and condition factor of genetically male tilapia (GMT), sex-reversed tilapia (SRT) and mixed-sex tilapia (MST) cultured in earthen ponds. Fingerlings of initial weights ranging from 0.41 to 0.91 g for GMT, SRT and MST were stocked in 150 m2 earthen ponds in triplicates at 3 fish m-2 and fed on a 35% crude protein diet. After 180 days culture period, the final body weights of SRT (202.82±7.30 g) was significantly higher than GMT (174.34±3.71 g) and MST (148.06±4.60 g) (P<0.05). The survival of MST (74.11±4.73%) was higher than GMT (67.22±9.72%) and SRT (65.22±2.94%) but no significant differences were observed (P>0.05). The condition factor of all the fish was above 1 and was significantly different between the groups (P<0.05). This study demonstrates that SRT has superior growth performance than GMT and MST hence sex reversal should be used for improved Nile tilapia production. Keywords : Monosex tilapia, All male tilapia, 17 α-methyltestosterone