# Management of the First Feeding of Dorada _Brycon sinensis_ with Two Species of Cladocerans
## 3 Results  
The S and S\({}_{\rm R}\) of dorada larvae after 24 h are presented in Figure 1. The highest S was recorded in larvae fed with Mm (76.1 \(\pm\) 6.6%) (\(p\) < 0.05), but did not differ significantly (\(p\) > 0.05) from those fed with F\({}_{\rm L}\) (64.0 \(\pm\) 13.5%) or with Mix (64.1 \(\pm\) 8.5%). Survival of the dorada larvae S\({}_{\rm R}\) test ranged between 92.5 \(\pm\) 5.0% (Me) and 95.3 \(\pm\) 2.4% (Mm), with no significant difference observed between the treatments (\(p\) > 0.05). Mortality due to cannibalism (C\({}_{\rm M}\)) and natural mortality (N\({}_{\rm M}\)) at 24 h is presented in Figure 2. The highest C\({}_{\rm M}\) in the dorada larvae was observed when feeding with Me (39.6 \(\pm\) 6.7%) but without a significant difference (\(p\) > 0.05) from those fed F\({}_{\rm L}\) (27.6 \(\pm\) 11.3%) and Mix (29.7 \(\pm\) 6.6%). The N\({}_{\rm M}\) of dorada larvae ranged between those fed with Mix (6.2 \(\pm\) 2.3%) and those fed with Me (8.8 \(\pm\) 6.4%) without a significant difference being observed between the treatments (\(p\) > 0.05). The W\({}_{\rm G}\), L\({}_{\rm G}\) and G of the dorada larvae after 24 h are presented in Table 1, and proximate composition of prey is presented in Table 2. The W\({}_{\rm G}\) of the dorada larvae fed the F\({}_{\rm L}\) (1.5 \(\pm\) 0.4 mg) was significantly higher (\(p\) < 0.05), although it was not different from those fed Mm (0.5 \(\pm\) 0.1 mg). The L\({}_{\rm G}\) of the dorada larvae fed the F\({}_{\rm L}\) (1.6 \(\pm\) 0.1 mm) was significantly higher (\(p\) < 0.05). However, this gain was not significantly different from that of the larvae fed the mixture of cladocerans (1.0 \(\pm\) 0.3 mm). The G of the dorada larvae fed the F\({}_{\rm L}\) forage larvae (3.2 \(\pm\) 0.4%/h) was significantly higher than those fed cladocerans (\(p\) < 0.05). Figure 1: Survival (S) and stress resistance (S\({}_{\rm R}\)) of dorada _Brycon sinensis_ larvae fed different live prey. Different letters indicate a significant difference (\(p\) < 0.05). Forage larvae of _Piarcatus brachypomus_ (F\({}_{\rm L}\)); _Moina minuta_ (Mm); _Macrothrix elegans_ (Me); mixture (50:50) of the _Moina minuta_ and _Macrothrix elegans_ (Mix). The prey present in the stomach contents of the dorada larvae after 24 h is illustrated in Figure 3. All prey supplied at the first feeding was found in the stomach contents of the dorada larvae. However, the lowest number of prey in the stomach contents was observed in the larvae fed on forage larvae (0.8 \(\pm\) 0.0 prey). In contrast, the highest number of prey was presented when fed Mm (3.7 \(\pm\) 0.0 prey). \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Parameters** & \multicolumn{4}{c}{**Treatments**} \\ \hline  & \(\mathbf{F_{L}}\) & **Mm** & **Me** & **Mix** \\ \hline W\({}_{\mathrm{G}}\) (mg) & 1.5 \(\pm\) 0.4 a & 0.5 \(\pm\) 0.1 ab & 0.3 \(\pm\) 0.1 b & 0.4 \(\pm\) 0.0 b \\ L\({}_{\mathrm{G}}\) (mm) & 1.6 \(\pm\) 0.1 a & 0.9 \(\pm\) 0.2 b & 0.9 \(\pm\) 0.3 b & 1.0 \(\pm\) 0.3 ab \\ G (\%/h) & 3.2 \(\pm\) 0.4 a & 1.3 \(\pm\) 0.2 b & 0.8 \(\pm\) 0.2 b & 1.1 \(\pm\) 0.1 b \\ \hline \hline \end{tabular} Different letters in the same row indicate a significant difference (\(p<\) 0.05).  
\end{table} 
Table 1: Weight gain (W\({}_{\mathrm{G}}\)), length gain (L\({}_{\mathrm{G}}\)), and specific growth rate (G) of dorada _Bryon sinensis_ larvae after receiving different feeding prey for 24 h. Forage larvae of _Piaractus brachyopomus_ (F\({}_{\mathrm{L}}\)), _Moina minuta_ (Mm); _Macrothrix elegans_ (Me); mixture (50:50) of the _Moina minuta_ and _Macrothrix elegans_ (Mix).