## 3 Results  
The relative growth rate (RGR) and productivity (Y) were used to assess the performance of the seaweeds in laboratory cultivation. There were statistically significant differences in ANOVA for both RGR and Y, for both weeks between the treatments. Overall, for the first week, RGR presented a test statistic F(4, 10) = 10.997, \(p\)\(<\) 0.001 and Y showed a test statistic F(4, 10) = 10.840, \(p\)\(<\) 0.001, while for the second week, RGR exhibited a test statistic F(4, 10) = 6.265, \(p\) = 0.009 and Y displayed a test statistic F(4, 10) = 6.262, \(p\) = 0.009. Therefore, the Tukey HSD test was conducted between the different treatments for each week of growth, and the significant differences are shown in Figure 2(a) for RGR and Figure 2(b) for Y. In the first week, the seaweed grown with Provasoli (PES) Medium and red LED light showed the highest RGR (0.595% day\({}^{-1}\)), but at the end of the second week, the seaweed grown with PES and white LED light showed the highest growth rate (0.945% day\({}^{-1}\)). There were no significant differences between these two treatments. The other treatments (VSE, NB, and blue LED) showed negative growth in the first week and some recovery (if any) in the second week. As to productivity, the same pattern was observed. The seaweed grown with PES and white LED light showed the best growth at the end of the second week (11.503 g(dw) m\({}^{-1}\) day\({}^{-1}\)), while in the first week PES and red LED light allowed for the highest Y (7.025 g(dw) m\({}^{-1}\) day\({}^{-1}\)). Therefore, the seaweeds grown on PES medium, both with white LED light and red light, showed the best performance. Again, the NB treatment exhibited a negative yield over the two weeks, while the blue LED light had a negative impact on the productivity of the seaweed during the first week, recovering during the second week. Analyzing each treatment over the two weeks of the trial, it was observed that both the relative growth rate and productivity increased consistently from week 1 to week 2. However, significant differences were only noted for the RGR in seaweeds treated with PES and white LED light and those exposed to blue LED light (F(1, 4) = 8.33, \(p\) = 0.045 and F(1, 4) = 31.99, \(p\) = 0.005, respectively). Additionally, significant differences were found for Y in seaweeds treated with blue LED light (F(1, 4) = 34.82, \(p\) = 0.004). Overall, the growth and yield were significantly higher for the seaweeds treated with PES and white LED light than for those exposed to PES and red LED light. The proximate composition of _C. acicularis_ both for cultivated and wild specimens is shown in Figure 4.  
Figure 4: Proximate analysis of the wild and cultivated biomass of _Chondracanthus acicularis_, grown over 14 days, for percentage of moisture, ash, and organic matter on fresh weight. VSE—Von Stoch Medium; PES—Provasoli Medium, NB—Nutribloom plus®, all grown under white LED light; blue—PES and blue LED light; red—PES and red LED light. Different letters within the bars indicate statistical differences for organic matter between treatments (ANOVA, \(p\) < 0.05). Figure 3: **(a)** Relative growth rate (RGR) and **(b)** productivity (Y) in the two-week trials of _Chondracanthus acicularis_. The bars represent the mean values and standard deviation (\(n\) = 3). VSE—Von Stoch Medium; PES—Provasoli Medium, NB—Nutribloom plus®, all grown with white LED light; blue—PES and blue LED light; red—PES and red LED light. Different letters above bars indicate significant differences (ANOVA, \(p\)-value < 0.05) between treatments, with lowercase letters for the first week and uppercase letters for the second week. An asterisk (*) above the bars indicates significant differences between weeks for each treatment. Moisture values were always high and varied between 73.88 \(\pm\) 0.007% in the seaweeds cultivated with PES and the red LED light and 68.79 \(\pm\) 1.01% in the algae cultivated with NB.