Rehberg-Haas, S., Meyer, S., Tielmann, M., Lippemeier, S., Vadstein, O., Bakke, I., Kjorsvik, E., Evjemo, J. O. and Schulz, Carsten (2015) Use of the microalga Pavlova viridis as enrichment product for the feeding of Atlantic cod larvae (Gadus morhua). Aquaculture, 438 . pp. 141-150. DOI 10.1016/j.aquaculture.2015.01.011.

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Abstract

An Atlantic cod larva (Gadus morhua) feeding experiment was carried out to compare three different live feed enrichment products for Brachionus ibericus and Artemia salina: 1) Nannochloropsis sp. microalgal concentrate (frozen) (N), 2) Pavlova viridis microalgal concentrate (frozen) (P), and 3) Larviva Multigain (R) (BioMar, Denmark)-formulated commercial product (CP). Over the experimental period of 42 days larvae of groups P and CP showed significantly higher instantaneous growth rates (G: 0.074 +/- 0.001 d(-1) and 0.079 +/- 0.009 d(-1)) than larvae of group N (G: 0.04 +/- 0.0 d(-1)). Survival at the end of the trial of group CP was highest (20 +/- 8%), whereas significantly lower survival was observed for groups P (7 +/- 2%) and N (<0.5%). Live feed ingestion by means of gut fullness index (GFI), evaluated at 4, 15 and 27 days post hatch (dph), was high for the larvae of group CP (GFI: 1.2 +/- 0.1, 1.4 +/- 0.0, 1.7 +/- 0.2, respectively) and group P (GFI: 1.4 +/- 0.1, 1.3 +/- 0.1, 1.8 +/- 0.2, respectively) compared to group N (1.0 +/- 0.0, 1.1 +/- 0.1, 1.2 +/- 0.1, respectively). Larvae fed with CP enriched live feed were able to withstand an extended period of feed deprivation (of 4 or 5 days), whereas groups Nand Pwere not able to re-initiate growth beyond the point-of-no-return, assessed on 5, 16 and 28 dph. Bacterial community diversity of tank water, feed and larvae of the three groups revealed that treatments N and P lead to similar, highly diverse microbial communities in comparison to group CP. Microalgal enrichment using P. viridis was not able to sustain the same survival rates as the commercial product, but resulted in a similar growth performance and feed ingestion rates and had a significant effect on microbial community diversity. (C) 2015 Elsevier B. V. All rights reserved.

Document Type:	Article
Additional Information:	Times Cited: 2
Keywords:	Cod larvae (Gadus morhua), Microalgae, Pavlova viridis, Live feed enrichment, EPA, DHA
Research affiliation:	Kiel University Kiel University > Kiel Marine Science OceanRep > The Future Ocean - Cluster of Excellence OceanRep > The Future Ocean - Cluster of Excellence > FO-R04
Refereed:	Yes
Open Access Journal?:	No
Publisher:	Elsevier
Projects:	Future Ocean
Date Deposited:	18 Oct 2016 03:47
Last Modified:	23 Sep 2019 23:04
URI:	https://oceanrep.geomar.de/id/eprint/32651

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