Bergvik Maria, Leiknes Oystein, Altin Dag, Dahl Kjersti Rennan, Olsen Yngvar
Department of Biology, Norwegian University of Science and Technology, 7491 Trondheim, Norway.
Lipids. 2012 Sep;47(9):881-95. doi: 10.1007/s11745-012-3700-3. Epub 2012 Jul 24.
Calanus finmarchicus is the dominant zooplankton species in the North Atlantic. This zooplankton is also of interest for commercial harvesting due to its high abundance and biochemical contents. In the present study, copepodite stage V of C. finmarchicus was sampled at different depths from January to June in 2009, 2010 and 2011 in the Trondheimsfjord (63°29'N 10°18'E). The fatty acid composition was analyzed in individual copepods and in the seston. It was found that the fatty acid profile of copepods was related to the fatty acid profile of potential food sources. This study indicates that the onset of vertical migration of stage V, which was observed in May, has a strong link to the production of phytoplankton and lipid accumulation in C. finmarchicus. The content of 14:0 and 16:0 fatty acids in the specimens did not increase from February to May in surface waters. This suggests that these fatty acids in the diet were used as precursors for the biosynthesis of 20:1n-9 and 22:1n-11 fatty acids and fatty alcohols. A potential harvesting season of C. finmarchicus could be when the species is abundant in surface waters; the content of n-3 fatty acids will vary throughout this season. The peak abundance of C. finmarchicus in the spring varied substantially between the years studied.
飞马哲水蚤是北大西洋占主导地位的浮游动物物种。由于其数量众多且富含生物化学成分，这种浮游动物也具有商业捕捞价值。在本研究中，于2009年、2010年和2011年1月至6月期间，在特隆赫姆峡湾（北纬63°29′，东经10°18′）的不同深度采集了飞马哲水蚤的第五期桡足幼体。分析了单个桡足类动物和悬浮颗粒中的脂肪酸组成。结果发现，桡足类动物的脂肪酸谱与潜在食物来源的脂肪酸谱相关。本研究表明，在5月观察到的第五期桡足幼体垂直迁移的开始与飞马哲水蚤中浮游植物的生产和脂质积累有密切联系。表层水体中样本的14:0和16:0脂肪酸含量从2月到5月并未增加。这表明饮食中的这些脂肪酸被用作20:1n - 9和22:1n - 11脂肪酸及脂肪醇生物合成的前体。飞马哲水蚤的一个潜在捕捞季节可能是该物种在表层水体中数量丰富的时候；整个季节中n - 3脂肪酸的含量会有所变化。在所研究的年份中，春季飞马哲水蚤的丰度峰值差异很大。
