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Fatty acid composition of T urbatrix aceti and its use in feeding regimes of C oregonus maraena ( B loch, 1779): is it really a suitable alternative to A rtemia nauplii?
Author(s) -
Hundt M.,
Brüggemann J.,
Grote B.,
Bischoff A. A.,
MartinCreuzburg D.,
Gergs R.,
Buck B. H.
Publication year - 2015
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/jai.12668
Subject(s) - biology , nematode , food science , fatty acid , zoology , biochemistry , ecology
Summary By incorporating the free‐swimming nematode T urbatrix aceti into early feeding regimes of the European whitefish Coregonus maraena , the suitability of this nematode species was investigated as an alternative to Artemia nauplii. During a 14‐day feeding trial in a total of 25 aquaria each 1.7 L (each treatment n = 5, 255 larvae/tank) T . aceti was used either as the sole live food or in combination with Artemia nauplii or microdiet to determine the effect of T . aceti on growth performance and survival rate of C . maraena . By analysing the fatty acid composition of T . aceti prior to and after enrichment with INVE spresso ® it was investigated whether the amount of n3‐polyunsaturated fatty acids (n3‐ PUFA ) in T . aceti could be further enhanced. Supplementation of Artemia nauplii with T . aceti increased growth significantly within the first 5 days of rearing in comparison to the non‐supplemented food treatments (14.39 ± 0.15 mm compared to 13.44 ± 0.18 mm; mean ± SE ). However, growth and survival of juvenile C . maraena on nematode‐supplemented Artemia nauplii did not differ significantly from non‐supplemented Artemia nauplii at the end of the 14‐day rearing period (15.22 ± 0.15 mm compared to 14.86 ± 0.24 mm). All feeding treatments containing Artemia nauplii showed significantly higher growth and lower mortality at the end of the experiment in comparison to diets containing only the microdiet or T . aceti or a combination thereof. The overall low performance of T . aceti alone can most likely be explained by an insufficient capacity of C . maraena to digest this nematode species efficiently. Enrichment with INVE spresso ® successfully increased the proportion of DHA in the T . aceti tissue. The results reveal that T . aceti cannot be considered a full alternative to Artemia nauplii, at least not in the rearing of C . maraena , but might be a useful vector of essential fatty acids within the early rearing period of this and potentially other fish species when provided as live food along with Artemia nauplii.