A review on broodstock nutrition of marine pelagic spawners: the curious case of the freshwater eels (Anguilla spp.)

To sustain eel aquaculture, development of reproduction in captivity is vital. The aim of this review is to assess our current knowledge on the nutrition of broodstock eels in order to improve the quality of broodstock under farming conditions, drawing information from wild adult eels and other mari...

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Bibliographic Details
Published in:Aquaculture Nutrition
Main Authors: Heinsbroek, L.T.N., Støttrup, J.G., Jacobsen, C., Corraze, G., Kraiem, M.M., Holst, L.K., Tomkiewicz, J., Kaushik, S.J.
Format: Article in Journal/Newspaper
Language:English
Published: 2013
Subjects:
bass dicentrarchus-labrax
cod gadus-morhua
dentex dentex-dentex
european sea bass
fatty-acid-composition
free amino-acids
halibut hippoglossus-hippoglossus
seabream sparus-aurata
turbot scophthalmus-maximus
yolk-sac larvae
Gadus morhua
Scophthalmus maximus
Turbot
Online Access:https://research.wur.nl/en/publications/a-review-on-broodstock-nutrition-of-marine-pelagic-spawners-the-c
https://doi.org/10.1111/anu.12091
Description
Summary:To sustain eel aquaculture, development of reproduction in captivity is vital. The aim of this review is to assess our current knowledge on the nutrition of broodstock eels in order to improve the quality of broodstock under farming conditions, drawing information from wild adult eels and other marine pelagic spawners. Freshwater eels spawn marine pelagic eggs with an oil droplet (type II), and with a large perivitelline space. Compared with other marine fish eggs, eel eggs are at the extreme end of the spectrum in terms of egg composition, even within this type II group. Eel eggs contain a large amount of total lipids, and a shortage of neutral lipids has been implied a cause for reduced survival of larvae. Eel eggs have higher ARA but lower EPA and DHA levels than in other fish. Too high levels of ARA negatively affected reproduction in the Japanese eel, although high levels of 18:2n-6 in the eggs of farmed eels were not detrimental. The total free amino acid amount and profile of eel eggs appears much different from other marine pelagic spawners. Nutritional intervention to influence egg composition seems feasible, but responsiveness of farmed eels to induced maturation might also require environmental manipulation. The challenge remains to succeed in raising European eel broodstock with formulated feeds and to enable the procurement of viable eggs and larvae, once adequate protocols for induced maturation have been developed.

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