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首页> 外文期刊>ICES Journal of Marine Science >Forage fish quality: seasonal lipid dynamics of herring (Clupea harengus L.) and sprat (Sprattus sprattus L.) in the Baltic Sea
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Forage fish quality: seasonal lipid dynamics of herring (Clupea harengus L.) and sprat (Sprattus sprattus L.) in the Baltic Sea

机译：饲料鱼的质量：波罗的海鲱鱼（Clupea harengus L.）和鲱鱼（Sprattus sprattus L.）的季节性脂质动态

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摘要

This study investigates lipid content and fatty acid composition of two important forage fish, sprat (Sprattus sprattus) and herring (Clupea harengus) in the Baltic Sea ecosystem. Seasonal variation in lipids was studied during three periods following the annual reproductive cycle considering potential differences relating to fish size, sex, and reproductive status. The isopod Saduria entomon, being at times an important prey for predatory fish, was included for comparison. In both sprat and herring, lipid content and absolute contents of essential polyun-saturated fatty acids (PUFAs) varied seasonally with high levels towards the end of the annual zooplankton production cycle, succeeded by a decline. Lipid content and fatty acid composition differed significantly between sprat and herring. Sprat lipid content was higher than herring, increasing with fish size and characterized by large proportions of monounsaturated fatty acids. Herring lipid content was related to the reproductive cycle and proportions of PUFAs were high compared with sprat. Levels of essential PUFAs were high in S. entomon compared with clupeids rendering it a valuable alternative prey species in the Baltic Sea ecosystem. The lipid dynamics of forage fish and benthos, combined with changes in availability and abundance, will affect growth and reproduction of their predators.
机译：这项研究调查了波罗的海生态系统中两种重要草料鱼（鲱鱼（Sprattus sprattus）和鲱鱼（Clupea harengus））的脂质含量和脂肪酸组成。在年度繁殖周期后的三个阶段中研究了脂质的季节性变化，考虑了与鱼类大小，性别和繁殖状况有关的潜在差异。有时将等足动物Saduria entomon作为掠食性鱼类的重要猎物进行比较。在鲱鱼和鲱鱼中，脂类含量和必需多不饱和脂肪酸（PUFA）的绝对含量在年度浮游动物生产周期结束时均以高水平季节性变化，随后有所下降。鲱鱼和鲱鱼之间的脂质含量和脂肪酸组成显着不同。鲱鱼的脂质含量高于鲱鱼，随鱼的大小而增加，并且具有很大比例的单不饱和脂肪酸。鲱鱼脂质含量与生殖周期有关，与小鱼相比，PUFAs的比例较高。与clupeids相比，S。entomon中基本PUFA的含量较高，使其成为波罗的海生态系统中有价值的替代猎物。饲料鱼和底栖动物的脂类动力学，以及可利用性和丰度的变化，将影响其捕食者的生长和繁殖。

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