Dietary effects on fatty acid composition in muscle tissue of juvenile European eel, Anguilla anguilla (L.)

Prigge, Enno; Malzahn, Arne M.; Zumholz, Karsten; Hanel, Reinhold

doi:10.1007/s10152-011-0246-3

Cited by 19 publications

(18 citation statements)

References 50 publications

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“…In experiments which involved bringing European eel to maturity, its brooders were kept either in freshwater (Müller et al, 2005(Müller et al, , 2012Horvath et al, 2011;Prigge et al, 2012) or in saltwater (Epler and Bieniarz, 1978;Mordenti et al, 2013). Water salinity under controlled conditions can be changed very quickly -much more so than in the natural environment.…”

Section: Resultsmentioning

confidence: 99%

Changes in Body Weight and Eye Size in Female European Eel Kept in Fresh and Salt Water

Nowosad

Kucharczyk

Czarkowski

et al. 2014

Italian Journal of Animal Science

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The eel is a catadromous fish which spends most of its life in freshwater and adults swim to the Sargasso Sea region to spawn. While preparing for the reproductive process, eels undergo a metamorphosis to become what is called silver eel; a process involving changes in the colour and weight of the body and an increase in the eye size. These are indicators of fish maturity and they facilitate the selection of fish for reproduction under controlled conditions. During this study, changes in the body weight (BW) and eye size in female European eel were observed while being given weekly hormonal injections of 20 mg kg -1 carp pituitary homogenate and kept in 15°C freshwater and in 15°C saltwater with a salinity of 32-33‰. Fish kept in saltwater but not subjected to hormonal stimulation were used as a control group. Furthermore, after the experiment was finished, females in the control group were kept for next 5 months, with the same environmental parameters maintained. Differences between the treated groups were observed as early as week 4 of the experiment. An increase in fish BW was observed in fish kept both in salt and freshwater which were subjected to hormonal stimulation. On the other hand, changes in eye size were observed in the fish kept in saltwater, both in those hormonally stimulated and otherwise. The eye diameter in the fish kept in fresh after hormonal stimulation did not change significantly.

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Section: Resultsmentioning

confidence: 99%

Changes in Body Weight and Eye Size in Female European Eel Kept in Fresh and Salt Water

Nowosad

Kucharczyk

Czarkowski

et al. 2014

Italian Journal of Animal Science

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“…It is estimated that it has dropped to a mere 1 % of its 1970 levels (Dekker 2003;Bevacqua et al 2011). Currently, the species is outside the limits of biological safety and, consequently, it has been placed on the Red List of endangered species in Europe (Belpaire et al 2009;Prigge et al 2012). Such radical changes in the eel population have been attributed, inter alia, to excessive exploitation of the species, deterioration of the environment, climatic changes and infestation of the swimming bladder with the Anguillicoloides crassus nematode (e.g., Friedland et al 2007;Belpaire et al 2009;Clevestam et al 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Many intensive physiological and morphological changes take place in the eels during the maturation process (Müller et al 2004a;van Ginneken et al 2005a;Clevestam et al 2011;Nowosad et al 2014). Although the European eel is regarded as a trophic opportunist (Prigge et al 2012), it does not consume any food during its migration journey and it takes the energy it needs to travel the thousands of kilometers and undergo the maturation process from the fat accumulated in its body (Clevestam et al 2011). Proper sexual maturation-vitellogenesis and ovary development brought about by environmental factors-takes place during the migration journey (Duriff et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Changes in European eel ovary development and body and ovary chemistry during stimulated maturation under controlled conditions: preliminary data

et al. 2014

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This study compared changes in the biochemical composition of muscles and ovaries of maturing female European eels during hormonal stimulation with carp pituitary homogenate under controlled conditions and in the development of oocytes. It has been found that differentiation of oocyte size in eel is visible from the beginning of the gamete maturation process. This differentiation increases as gonads grow. Furthermore, oocytes are at different development stages and are still highly differentiated in terms of size during ovulation. Moreover, the biochemical composition of the body and gonads was found to change. During the process of maturation, the relative fat content in the eel body decreases both in the muscles (from 21.99 ± 4.3 to 18.48 ± 3.3 %) and in gonads (from 25.76 ± 2.71 to 15.21 ± 4.7 %), with the changes in ovaries being more rapid. Protein content in muscles also decreased (from 15.98 ± 3.13 to 12.35 ± 1.6 %) during the process of female maturation. Different trends were observed for polyunsaturated fatty acids (EPA and DHA). The total amount of these acids decreased in muscles (P \ 0.05) but increased in ovaries (P [ 0.05).

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“…Several studies have reported the n-3 PUFA composition of fillets for the five fish species that we studied. Those studies reported that the proportion of n-3 PUFAs was 19-24% in large yellow croaker [15], 15.37-25.26% in silvery pomfret [16], 15.22-19.64% in river eel [17,18], 3.1-15.9% in tilapia [19], and 9.7-16.8% in grass carp [20]. Comparison of the data obtained in the present study with those data indicates that the n-3 PUFA content is not higher in brains and eyes than in fillets.…”

Section: Discussionmentioning

confidence: 99%

Comparative Analysis of Fatty Acid Profiles in Brains and Eyes of Five Economic Fish Species in Winter and Summer

Li¹,

Liu²,

Zhang³

et al. 2014

JFNR

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Fish brains and eyes are commonly consumed in China, however, their nutritional importance has not been evaluated. We investigated the fatty acid (FA) profiles in brains and eyes of five economically important fish species with different food habits (carnivorous, omnivorous, and herbivorous). The fatty acid profiles were also compared between winter and summer. The FA compositions of brains and eyes of carnivorous and marine fishes were similar, and differed from those of omnivorous and herbivorous freshwater fishes. In winter, there were higher proportions of n-3 polyunsaturated fatty acids in brains and eyes of carnivorous and marine fishes than in those of omnivorous and herbivorous freshwater fishes; the magnitude of this difference was smaller in summer. The FA compositions of brains and eyes of these five fishes were comparable to those reported for their fillets in previous studies. Therefore, fish brains and eyes are not more nutritious than fillets of the same species.

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Dietary effects on fatty acid composition in muscle tissue of juvenile European eel, Anguilla anguilla (L.)

Cited by 19 publications

References 50 publications

Changes in Body Weight and Eye Size in Female European Eel Kept in Fresh and Salt Water

Changes in Body Weight and Eye Size in Female European Eel Kept in Fresh and Salt Water

Changes in European eel ovary development and body and ovary chemistry during stimulated maturation under controlled conditions: preliminary data

Comparative Analysis of Fatty Acid Profiles in Brains and Eyes of Five Economic Fish Species in Winter and Summer

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