Abstract
This study aimed to compare the growth performance, survival rate, flesh, and proximate composition of sex-grouped triploid and diploid Nile tilapia. The triploid population was obtained through heat shock at 41 oC for 4 min, 4 min after fertilization. Before sexing, 50 fish were reared in aquaria at a density of 1 fish L$^{-1}$ for 2 months. After sexing, both triploid and diploid fish were grouped into all-male, all-female, and mixed-sex groups and reared in hapas at a density of 10 fish m$^{-2}$ for 4 months. Each group was replicated three times. The highest body weight, body length, and growth rate were observed in all-male triploids, while the lowest of those parameters were obtained in all-female diploids. The highest survival rate was achieved in both all-male and mixed-sex triploids, and it did not significantly differ from the mixed-sex diploid P > 0.05 . The triploid fish had a higher edible carcass percentage than diploids. Proximate analysis indicated that the crude protein content of triploids was higher than that of diploids, while the crude lipid and ash contents were lower than those of diploids P < 0.05 . Triploid Nile tilapia had the best growth performances, including flesh quantity and quality, compared to diploids.
Highlights
Sterile fish are beneficial in aquaculture as the fish will reduce or even prevent the use of energy for reproduction in sterile metabolism processes
The production level of monosex male tilapia farming was 10% higher compared to the mixed-sex population [16,17]
Experimental fish preparation In this study, the fish used were of the Wanayasa strain of Nile tilapia known as NIRWANA, produced through a family selection program between genetic improvement for farmed tilapia and genetically enhanced tilapia in Indonesia
Summary
Sterile fish are beneficial in aquaculture as the fish will reduce or even prevent the use of energy for reproduction in sterile metabolism processes. Most of the anabolic energy will be transferred to somatic growth. Culturing sterile fish is one of the best farming management approaches in aquaculture practices, as it enables the use of the metabolism pathway to obtain somatic tissue quickly instead of producing either sperm or eggs in the spawning season [2]. The high ability (uncontrolled) of tilapia reproduction causes unexpected density in the pond with varied size and slow growth, making it less commercially profitable in aquaculture. Sterilization is the best possible solution to solve the problems in tilapia culture [3]. Lutz [4] mentioned that among the future’s aquaculture commodities, tilapia
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