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首页> 外文期刊>Marine ecology >Growth and photosynthetic rates of Chlamydomonas plethora and Nitzschia frustula cultures isolated from Kuwait Bay, Arabian Gulf, and their potential as live algal food for tropical mariculture
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Growth and photosynthetic rates of Chlamydomonas plethora and Nitzschia frustula cultures isolated from Kuwait Bay, Arabian Gulf, and their potential as live algal food for tropical mariculture

机译：阿拉伯海湾科威特湾分离出的衣藻和纳氏镰刀菌的生长及其光合速率及其作为热带海水养殖藻类食品的潜力

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摘要

With a view to utilize local algae as food organisms in mariculture, the green alga Chlamydomonas plethora and the diatom Nitzschia frustula were isolated and studied from the unique coastal waters arid zone off Kuwait. Batch cultures of C. plethora and N. frustula had maximum division rates (μ_(max)) of 2.5 and 3.4 day~(-1), respectively. Cultures grown for 36 h yielded comparable growth rates. Photosynthesis-irradiance relationships in cultures harvested at various phases of growth showed that cultures attained log phase after 1-day growth and yielded the highest assimilation numbers (P_m~B: μg C [μg Chl a]~(-1) h~(-1)): 22.8 for C. plethora and 18.1 for N. frustula. Their initial slopes (α~B: ng C [μg Chl a]~(-1) h~(-1) [μmol m~(-2) s~(-1)]~(-1) were also the highest observed so far: 79.5 for C. plethora and 39.6 for N. frustula. Photoinhibition was low. Compared with these, assimilation numbers in senescent cultures of 20-day growth were <8% of the maximum for both species, and the initial slope decreased to 17 and 13% in C. plethora and N. frustula, respectively. Two polyunsaturated fatty acids (20:5n-3 eicosapentaenoic acid and 22:6n-3 docosahexaenoic acid) that are essential in many marine animal diets constituted up to 24% and 1.9% of the total fatty acids, respectively. Of the two algae, N. frustula contained higher levels of 16:1n-7, 20:5n-3 and comparatively low levels of 22:6n-3 fatty acids. Due to its rapid growth, high photosynthetic rate and presence of the amino acids leucine, lysine, glutamic acid and arginine N. frustula has good potential as a feed organism in mariculture applications. The capacity of these algae to produce a wide range of size groups (nano and net plankton) is an additional bonus for mariculture operations.
机译：为了利用当地藻类作为海水养殖中的食物生物，从科威特附近独特的沿海水域和干旱地区分离并研究了绿藻衣藻和硅藻小叶硅藻（Nitzschia frustula）。 C. plethora和Frustula的分批培养最大分裂率（μ_（max））分别为2.5和3.4 day〜（-1）。生长36小时的培养物产生可比的生长速率。在不同生长阶段收获的培养物中光合作用与辐照度的关系表明，培养物在生长1天后达到对数期，并产生最高的同化数（P_m〜B：μgC [μgChl a]〜（-1）h〜（- 1））：对于C. plethora为22.8，对于平头猪笼草为18.1。它们的初始斜率（α〜B：ng C [μgChl a]〜（-1）h〜（-1）[μmolm〜（-2）s〜（-1）]〜（-1）也最高迄今观察到：百日草为79.5，平头猪笼草为39.6，光抑制很低，与之相比，衰老培养物在20天的生长中的同化率均低于两个物种的最大值的8％，并且初始斜率降低了分别在胸膜念珠菌和延髓猪笼草中分别降低至17％和13％，两种多不饱和脂肪酸（20：5n-3二十碳五烯酸和22：6n-3二十二碳六烯酸）在许多海洋动物饮食中必不可少，占24％两种藻中的平果猪笼草中脂肪酸的含量较高，分别为16：1n-7、20：5n-3和22：6n-3相对较低。快速生长，高光合作用率和氨基酸亮氨酸，赖氨酸，谷氨酸和精氨酸氮芥的存在作为海产养殖中的饲料生物具有良好的潜力，这些藻类具有广泛的生产能力。规模范围（纳米和浮游生物）的范围是海水养殖活动的额外奖励。

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