Effects of Varying Light Intensities and Temperature Levels on the Growth of Gracilaria spp. Under Laboratory Condition

This study aims to evaluate the best combination of light intensities and temperature levels on the growth of Gracilaria spp. Specifically, it aims to determine the significant interaction effect between light intensities and temperature levels on the growth of Gracilaria spp. under laboratory conditions. The Experimental set-up was conducted at College of Fisheries Laboratory and Research Station (CFLRS) in Brgy. Siguel, General Santos City for a period of 60 days. Eighteen (18) 3.5L glass tanks were used as experimental units and was stocked with 3g of Gracilaria spp. The study tested for six treatments with varying light intensity and temperature levels The data were analyzed using two-way ANOVA and comparison between significant difference and interaction were analyzed using post-hoc test (Tukey’s HSD). After the experiment, the highest mean body weight of Gracilaria spp. was obtained from Treatment III, with recorded value of 4.67g. Meanwhile, results also demonstrated that Treatment III obtained the highest weight gain with 1.67g. Likewise Similarly, Treatment III recorded the highest specific growth rate with 0.32% per day. Statistical analysis revealed that light intensity has a significant effect (p<0.05) and that there is no significant effect (p>0.05) on temperature. On the other hand, there is a significant interaction (p<0.0.5) between light intensity and temperature on the growth of Gracilaria spp. (MW, MWG, and SGR) after 60 days of culture. The study concluded that the best growth of Gracilaria spp. can be achieved of water at light intensity of 120 m-2 s-1 and temperature 30°C under laboratory condition.

本研究旨在评估光强与温度水平的最优组合对江蓠属（Gracilaria spp.）生长的影响。具体而言，本研究旨在明确实验室条件下，光强与温度水平之间的交互效应对江蓠属生长的显著作用。本实验于菲律宾桑托斯将军城西盖尔村（Brgy. Siguel）的渔业学院实验室与研究站（CFLRS）开展，实验周期为60天。研究采用18个3.5升玻璃缸作为实验单元，每个缸接种3克江蓠属藻体。实验设置6组不同光强与温度水平的处理组。实验数据采用双因素方差分析（two-way ANOVA）进行统计检验，组间差异及交互效应的多重比较采用Tukey’s HSD事后检验（post-hoc test）。实验结束后，处理组III的江蓠属藻体平均体重最高，实测值为4.67克；同时，该组的体重增益也最高，达1.67克。此外，处理组III的比生长速率最高，为每日0.32%。统计分析结果显示，光强对江蓠生长具有显著影响（p<0.05），而温度的影响则不显著（p>0.05）。另一方面，培养60天后，光强与温度的交互效应对江蓠生长（体重、体重增益及比生长速率）具有显著影响（p<0.05）。本研究最终得出结论：在实验室条件下，当光强为120 m⁻²·s⁻¹、温度为30°C时，江蓠属可获得最优生长。