Optimizing stocking density for enhanced growth and survival of a cyprinid fish (G. theunensis) fry in cage cultivation environment
DOI:
https://doi.org/10.55674/cs.v17i2.259896Keywords:
Garra theunensis, Stocking density, Cyprinid fish, Growth performanceAbstract
The impact of stocking densities on the growth and survival of a cyprinid fish (G. theunensis) fry was thoroughly investigated in a comprehensive study aimed at identifying optimal aquaculture conditions. This research utilized a Complete Randomized Design (CRD) with three replicates for each of four different stocking densities: 50 100 150 and 200 fry m-³ over a three-month period from October to December 2024. Fish were fed a commercial fish feed containing 28% protein twice daily. The study found no significant differences (P>0.05) in the survival rates across the different densities with rates ranging from 73.83% to 82.67%. However, the lowest density (50 fry m-³) resulted in a significantly higher final length of 5.93 cm, compared to 5.40 cm, 5.19 cm, and 5.03 cm for the 100, 150, and 200 fry m-³ densities, respectively. Similarly, fish at the 50 fry m-³ density achieved a significantly higher final weight of 4.88 g, compared to 4.08 g, 3.92 g, and 3.90 g for the higher densities. The daily gain was highest at the lowest density, measuring 0.05 g fish-1 day-1, versus slightly lower gains at higher densities. Specific growth rate: The rate at 50 fry m-³ was 157.95% fish-1 day-1, substantially higher than those observed at higher densities. Weight Gain: Demonstrated a similar pattern, with the 50 fry m-³ density achieving a 612.77% gain, significantly outperforming the other densities. Feed Conversion Ratio: The FCR was most efficient at the lowest density (2.34) worsening progressively at higher densities.
GRAPHICAL ABSTRACT
HIGHLIGHTS
- The lowest stocking density (50 fry/m³) resulted in the best growth performance, with the highest final length (5.93 cm), weight (4.88 g), and daily weight gain.
- Survival rates showed no significant differences across densities, ranging from 73.83% to 82.67%.
- The feed conversion ratio (FCR) was most efficient at the lowest density (2.34) and worsened as stocking density increased.
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