Institut National des Sciences et Technologies de la Mer, B3 Aqua laboratory, Centre de recherche de Kheiredine, 29 Rue Général Kheiredine, 2015, Le Kram, Tunisie.
Institut National Agronomique de Tunisie 43, Avenue Charles Nicolle 1082 -Tunis, Mahrajène, Tunisie.
Sci Rep. 2020 Jun 22;10(1):10014. doi: 10.1038/s41598-020-66003-y.
This study evaluated the growth and biochemical composition of farming Gracilaria gracilis (Stackhouse) M. Steentoft, L. M. Irvine & W. F. Farnham in the Bizerte Lagoon (BL) and Bizerte Bay (BB) in the North Coast of Tunisia, using lantern nets. Effects of site and depth on alga daily growth rate (DGR) and biochemical composition were investigated. The DGR was affected by culture site (1.42 ± 0.65% day and 1.19 ± 0.34% day for the BL and the BB respectively). Agar yield, was higher (p < 0.05) in the BB than the BL (23.31 ± 2.64% vs. 19.19 ± 2.32%) with a higher (p < 0.05) 3,6-anhydrogalactose (3,6-AG) contents (41.37 ± 3.68% vs 23.30 ± 5.40%) and a lower (p < 0.05) sulphate degree (6 ± 2.00% vs 8.80 ± 0.86%). The proteins contents were independent of the site and depth of culture (20.74 ± 7.22% and 22.02 ± 6.34% for the BL and the BB respectively). R-phycoerythrin (R-PE) contents were significantly higher (p < 0.05) in the BB (0.86 ± 0.31 mg g) than those obtained in the BL (0.33 ± 0.12 mg g). The salinity, transparency, nitrate and ammonium were monitored in both sites, and their influences were discussed. Our results suggest that G. gracilis cultured in Bizerte Bay can be used in a cascading biorefinery approach.
本研究采用灯笼网评估了突尼斯北部沿海比塞大泻湖（BL）和比塞大湾（BB）中养殖的石花菜（Gracilaria gracilis）（Stackhouse）M. Steentoft、L. M. Irvine & W. F. Farnham 的生长和生化组成。研究了地点和深度对藻类日增长率（DGR）和生化组成的影响。DGR 受到培养地点的影响（BL 和 BB 分别为 1.42±0.65%天和 1.19±0.34%天）。琼脂产量（p<0.05）在 BB 中高于 BL（23.31±2.64%对 19.19±2.32%），具有更高的 3,6-脱水半乳糖（3,6-AG）含量（41.37±3.68%对 23.30±5.40%）和更低的硫酸盐程度（6±2.00%对 8.80±0.86%）。蛋白质含量不受培养地点和深度的影响（BL 和 BB 分别为 20.74±7.22%和 22.02±6.34%）。R-藻红蛋白（R-PE）含量在 BB 中显著更高（p<0.05）（0.86±0.31mg g），高于 BL 中的含量（0.33±0.12mg g）。监测了两个地点的盐度、透明度、硝酸盐和铵盐，并讨论了它们的影响。我们的结果表明，在比塞大湾养殖的石花菜可以用于级联生物炼制方法。
