Lipid and fatty acid variations in muscle tissues of the ‘yellow’ stage of the European eel (<i>Anguilla anguilla</i>) during short-term adaptation to freshwater and seawater under food deprivation

Ghazali, Nabila; Boussoufa, Dhouha; Navarro, Juan Carlos; Cafsi, Mhamed El

doi:10.1080/10236244.2013.774548

Cited by 4 publications

(4 citation statements)

References 27 publications

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“…Previous studies have noted intraspecific variability in the biochemical composition of A. anguilla across salinities ( e.g ., in the stable isotopes composition of muscle, Harrod et al ., 2005; and FA, Prigge et al ., 2012; Ghazali et al ., 2013; Vasconi et al ., 2019), as well as across life history stages ( e.g ., in lipid metabolism and blood components, Larsson & Fange, 1969). Here we considered both sources of variation (and their interaction) when analysing eel lipid profiles across three main tissues/organs.…”

Section: Discussionmentioning

confidence: 99%

“…Intraspecific variation in lipid content and composition of fish across salinity zones may be related to diet ( e.g ., Vasconi et al ., 2019). Osmoregulatory and other physical adjustments due to variations in environmental salinity may also modulate lipid metabolism, as has been reported in several species, including guppy Poecilia reticulata Peters 1859 (Daikoku et al ., 1982), European bass Dicentrarchus labrax (L. 1758) (Roche et al ., 1983), mullet Mugil cephalus Linnaeus 1758 (Khériji et al ., 2003) and A. anguilla (Ghazali et al ., 2013). For instance, Daikoku et al .…”

Section: Discussionmentioning

confidence: 99%

“…Similarly, Ghazali et al . (2013) observed that the lipid content in the muscle of FW yellow eels decreased after they fasted in SW for 4 weeks. The authors suggested that these eels most likely used the energy stored in the muscle lipids to fuel their metabolic needs while adjusting to salinity variations (Ghazali et al ., 2013).…”

Section: Discussionmentioning

confidence: 99%

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Feeding habitat and silvering stage affect lipid content and fatty acid composition of European eel Anguilla anguilla tissues

Parzanini

Arts

Rohtla

et al. 2021

Journal of Fish Biology

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Lipids, particularly fatty acids (FAs), are major sources of energy and nutrients in aquatic ecosystems and play key roles during vertebrate development. The European eel Anguilla anguilla goes through major biochemical and physiological changes throughout its lifecycle as it inhabits sea‐ (SW), and/or brackish‐ (BW) and/or freshwater (FW) habitats. With the ultimate goal being to understand the reasons for eels adopting a certain life history strategy (FW or SW residency vs. ‘habitat shifting’), we explored differences in lipid content and FA composition of muscle, liver and eyes from eels collected across Norwegian SW, BW and FW habitats, and at different lifecycle stages (yellow to silver). FW and SW eels had a higher lipid content overall compared to BW eels, reflecting differences in food availability and life history strategies. SW eels had higher proportions of certain monounsaturated FAs (MUFAs; 18:1n‐9, 20:1n‐9), and of the essential polyunsaturated FAs 20:5n‐3 (eicosapentaenoic acid, EPA) and 22:6n‐3 (docosahexaenoic acid) than FW eels, reflecting a marine‐based diet. In contrast, the muscle of FW eels had higher proportions of 18:3n‐3, 18:2n‐6 and 20:4n‐6 (arachidonic acid), as is typical of FW organisms. MUFA proportions increased in later stage eels, consistent with the hypothesis that the eels accumulate energy stores prior to migration. In addition, the decrease of EPA with advancing stage may be associated with the critical role that this FA plays in eel sexual development. Lipid and FA information provided further understanding of the habitat use and overall ecology of this critically endangered species.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Feeding habitat and silvering stage affect lipid content and fatty acid composition of European eel Anguilla anguilla tissues

Parzanini

Arts

Rohtla

et al. 2021

Journal of Fish Biology

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“…Additionally, ecophysiology of thermal adaptation to the seasonal temperature variations of inland waters might influence more lipid storage than in a thermally stable marine environment. Variations in total lipid content and the profile of different lipid types are common in cold adaptations among fish and other vertebrates (Palmerini et al 2009, Heffer-Lauc et al 2010, Mazzeo et al 2010, Ghazali et al 2013. Also, lipids tend to accumulate in eel prior to spawning migration (Dębowska et al 2015) but also tend to increase with growth (Degani et al 1986).…”

Section: Discussionmentioning

confidence: 99%

Lipid profiles of Mediterranean moray, Muraena helena, European conger, Conger conger, and European eel, Anguilla anguilla (Actinopterygii: Anguilliformes)

Điić¹,

Landeka²,

Fuchs³

et al. 2017

Acta Ichthyol. Piscat.

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Background. The current topics in fish fatty acid (FA) research include qualitative comparisons, trophic transfer as nutritive sources of FA, evolutionary comparison of synthesis pathways, and potential application of most efficient fish desaturases and elongases. FA are scarcely investigated in Elopomorpha and Anguilliformes, except for common-and Japanese eels. In this study determines the differences in lipid composition of FA between species of the order Anguilliformes, representing three families, Mediterranean moray, Muraena helena Linnaeus, 1758; European conger, Conger conger (Linnaeus, 1758); and European eel Anguilla anguilla (Linnaeus, 1758) (thereafter moray, conger, and eel, respectively). These are the first results on FA for the moray. Material and methods. The fishes were collected in September 2011 on the Croatian coast of the Adriatic Sea, including the Neretva River estuary. Total lipids were extracted and the fatty acid profile in total lipid isolates were determined by gas chromatography of the corresponding methyl esters, obtained by acid methanolysis. A Hewlett Packard HP 5890A capillary gas chromatograph equipped with flame ionization detector (FID) was used. Results. Both moray and conger were less fatty than eel but had higher ω FA content, especially ω-3. Moray and conger, contained more proteins than lipids, while in eel, lipids exceeded the crude protein content. Conger was the leanest fish among the three. The qualitative SFA, MUFA, and PUFA were species specific (myristic FA characteristic for moray). PUFA were higher in moray and conger, due primarily to DHA. Moray showed the most favourable qualitative lipid content and profile and best ratio of ω-3 to ω-6 FA. Moray had 7.6-and conger 11-fold more DHA than eel. Approximate ratios along ω-3 biosynthesis pathway, show that there was 6-fold more EPA than α-LNA in moray and conger, and only 1.64-in eel, 5.63-fold, and 11.27-fold more DHA than DPA in Mediterranean moray and conger, respectively, and only 1.03-fold more in eel Approximate ratios along ω-3 biosynthesis pathway, show that there was 6-fold more EPA than α-LNA in moray and conger, and only 1.64-fold in eel. DHA was 5.63-fold, and 11.27-fold more abundant than DPA in moray and conger, respectively. In comparison, eel had only 1.03-fold more DHA than DPA. Conclusions. Although trophic status and environment are the most determined, the differences in individual FA ratios might indirectly suggest different physiological utilization of elongation pathways in each species. Presently reported results draw focus on Muraena helena and Conger conger to be included in the studies elongase and desaturase pathways in teleost fish.

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The evolving story of catadromy in the European eel (Anguilla anguilla)

Durif,

Arts,

Bertolini

et al. 2023

ICES Journal of Marine Science

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Anguillid eels were once considered to be the classic example of catadromy. However, alternative life cycles have been reported, including skipping the freshwater phase and habitat shifting between fresh, brackish, and saltwater throughout the growth phase. There is a lack of knowledge regarding these alternate life strategies, for example, the proportion of individuals in the population that adopt them compared to classic catadromy. We provide a description of these alternate life cycle strategies in temperate anguillids, their possible drivers, and the methods available to investigate them. These methods (lethal and non-lethal), include otolith microchemistry, fatty acid and stable isotope analyses, parasite identification, blood transcriptomics, and electronic tags. We argue that since the current management framework for the European eel and other temperate eels is based mainly on the freshwater component of the population, it ignores eels growing in saline waters. Many of the factors that are thought to be responsible for the precipitous decline of the eel population are more prevalent in freshwater systems. Therefore, the contribution of saline eels may be more important than currently estimated. The habitat-shifting ability of eels may be all the more crucial for the persistence and recovery of those species that are endangered.

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Lipid and fatty acid variations in muscle tissues of the ‘yellow’ stage of the European eel (Anguilla anguilla) during short-term adaptation to freshwater and seawater under food deprivation

Cited by 4 publications

References 27 publications

Feeding habitat and silvering stage affect lipid content and fatty acid composition of European eel Anguilla anguilla tissues

Feeding habitat and silvering stage affect lipid content and fatty acid composition of European eel Anguilla anguilla tissues

Lipid profiles of Mediterranean moray, Muraena helena, European conger, Conger conger, and European eel, Anguilla anguilla (Actinopterygii: Anguilliformes)

The evolving story of catadromy in the European eel (Anguilla anguilla)

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