## 3 Results  
### Growth and Production Parameters, Somatic Indices, and FINAL Product  
During the experiment, the fish doubled their initial BW. However, the growth parameters (BW, TL, SL, and WG), condition factor K, and selected somatic indices (VSI, GSI, HSI, SSI, VFSI, and GaSI) did not differ (\(p\) > 0.05) between the tested groups (HS0-HS6) after long-term HS dietary exposure (see Table 1). The survival rate reached 74.7-90.7% of the initially stocked fish in the HS0-HS6 groups.  
At the end of the experiment, the fish were processed and the yields of eviscerated body, head, fillets with skin and fillets without skin were calculated as % of fish BW. While the weight of the head and fillets with skin differed (\(p\) < 0.05) between the tested groups (HS0-HS6) by the end of the long-term HS dietary exposure, the yield of eviscerated body and fillets without skin did not significantly differ (\(p\) > 0.05) between the tested groups (see Figure 1). The yield of the eviscerated body was 90.4-92.3%, head 22.9-25.2%, fillets with skin 49.0-51.7%, and fillets without skin reached 41.5-42.7% of fish BW.  
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Parameters** & **Initial** & **HS0** & **HS1** & **HS3** & **HS6** & \(F^{test}\) & \(\mu^{disk}\) & \(p\) \\ \hline
**Period (d)** & **Day 0** & **Day 84** & **Day 84** & **Day 84** & **Day 84** & **Day 84** & **Day 84** & **Day 84** & **Day 84** \\ \hline BW (g) & 368.94 \(\pm\) 87.38 & 746.37 \(\pm\) 212.38 & 727.81 \(\pm\) 180.46 & 732.18 \(\pm\) 224.08 & 713.50 \(\pm\) 181.42 & 0.51\({}^{\rm{KW}}\) & All & 0.92 \\ TL (mm) & 354.68 \(\pm\) 25.53 & 444.90 \(\pm\) 38.42 & 443.56 \(\pm\) 35.01 & 442.32 \(\pm\) 42.27 & 440.79 \(\pm\) 33.47 & 0.09\({}^{\rm{IWA}}\) & All & 0.97 \\ SL (mm) & 317.98 \(\pm\) 23.45 & 396.82 \(\pm\) 36.08 & 396.73 \(\pm\) 32.83 & 395.97 \(\pm\) 38.99 & 396.79 \(\pm\) 30.51 & 0.01\({}^{\rm{IWA}}\) & All & 0.99 \\ WG 08-84 (g) & - & 375.73 \(\pm\) 164.02 & 348.93 \(\pm\) 142.77 & 374.08 \(\pm\) 178.96 & 315.67 \(\pm\) 119.02 & 1.87\({}^{\rm{KW}}\) & All & 0.60 \\ K & 0.81 \(\pm\) 0.08 & 0.83 \(\pm\) 0.07 & 0.82 \(\pm\) 0.08 & 0.82 \(\pm\) 0.07 & 0.82 \(\pm\) 0.08 & 0.92\({}^{\rm{KW}}\) & All & 0.82 \\ VSI (\%) & - & 7.67 \(\pm\) 20.08 & 9.58 \(\pm\) 4.09 & 7.81 \(\pm\) 2.21 & 8.13 \(\pm\) 2.85 & 6.39\({}^{\rm{KW}}\) & 96 & 0.09 \\ GSI (\%) & - & 2.09 \(\pm\) 2.40 & 2.55 \(\pm\) 2.67 & 2.28 \(\pm\) 2.83 & 2.85 \(\pm\) 3.28 & 1.18\({}^{\rm{KW}}\) & 96 & 0.76 \\ HSI (\%) & - & 0.93 \(\pm\) 0.54 & 1.03 \(\pm\) 0.46 & 0.88 \(\pm\) 0.31 & 0.98 \(\pm\) 0.46 & 1.11\({}^{\rm{KW}}\) & 96 & 0.77 \\ SSI (\%) & - & 0.05 \(\pm\) 0.02 & 0.05 \(\pm\) 0.01 & 0.05 \(\pm\) 0.01 & 0.05 \(\pm\) 0.02 & 3.25\({}^{\rm{IWA}}\) & 96 & 0.35 \\ VPSI (\%) & - & 0.87 \(\pm\) 0.43 & 0.76 \(\pm\) 0.44 & 0.95 \(\pm\) 0.66 & 0.61 \(\pm\) 0.39 & 6.75\({}^{\rm{KW}}\) & 96 & 0.08 \\ GaSI (\%) & - & 1.46 \(\pm\) 0.32 & 1.46 \(\pm\) 0.33 & 1.45 \(\pm\) 0.31 & 1.52 \(\pm\) 0.34 & 0.46\({}^{\rm{KW}}\) & 96 & 0.93 \\ \hline \end{tabular} Note: The values are presented as means \(\pm\) SD. The number of considered experimental units (\(n\)). One-way ANOVA (\({}^{\rm{IWA}}\)) or Kruskal-Wallis (\({}^{\rm{KW}}\)) test results are power of test (\(F\)) and level of significance (\(p\) = 0.05). No significant differences (Tukey HSD test, \(p\) > 0.05) were observed between the groups.  
\end{table}
Table 1: Fish individual body weight (BW), total body length (TL and SL), weight gain (WG), condition factor (K), and somatic indices (VSI, GSI, HSI, SSI, VFSI, and GaSI) of C. _gariepinus_ after a long-term exposure to experimental HS diets (HS0–HS6).