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Growth of juvenile Atlantic cod Gadus morhua in land-based recirculation systems. Effects of feeding regime, photoperiod and diet

Fülberth, M; Moran, Damian LU ; Jarlbæk, H and Støttrup, J.G (2009) In Aquaculture 292(3-4). p.225-231
Abstract
The combined effect of feeding regime and photoperiod on the growth of juvenile Atlantic cod Gadus morhua in land-based recirculating aquaculture systems (RAS) was examined using three different commercial diets. Fish of 8-10 g were reared in 1 m³ tanks at an initial density of 10 kg m-³ for 78 d. Three RAS units were used to simultaneously test three feed/photoperiod regimes that might be encountered in the wild or aquaculture; LightDark (LD) 24:0, LD12:11 (+1 h crepuscular periods) and LD6:6 (+12 h crepuscular periods). Feed was administered during the light period every 30 min for a 3 min feeding duration. In each RAS unit three diets (A, B and C) were tested, which were broadly similar in composition but from different manufacturers.... (More)
The combined effect of feeding regime and photoperiod on the growth of juvenile Atlantic cod Gadus morhua in land-based recirculating aquaculture systems (RAS) was examined using three different commercial diets. Fish of 8-10 g were reared in 1 m³ tanks at an initial density of 10 kg m-³ for 78 d. Three RAS units were used to simultaneously test three feed/photoperiod regimes that might be encountered in the wild or aquaculture; LightDark (LD) 24:0, LD12:11 (+1 h crepuscular periods) and LD6:6 (+12 h crepuscular periods). Feed was administered during the light period every 30 min for a 3 min feeding duration. In each RAS unit three diets (A, B and C) were tested, which were broadly similar in composition but from different manufacturers. Water exchange rate averaged 10-19% in the three recirculation systems, and key water quality parameters such as NH4+ and CO2 remained at low effect concentrations (<0.4 and <3 mg L-1, respectively). Final stocking densities were 45-60 kg m-³. There was a significant influence of both feed/photoperiod regime and diet on specific growth rate (SGR). Fish receiving the LD12:11 and LD6:6 regimes and Diet A grew best (SGR 2.59 and 2.54 % d-1 respectively). Fish fed Diet B and C also grew best under the LD12:11 and LD6:6 feed/photoperiod regimes (SGR range of 2.41 – 2.46 % d-1). Conversely, fish kept in the LD24:0 feed/photoperiod regime grew relatively slowly irrespective of diet type (SGR range of 2.26 – 2.32 % d-1). The feed conversion performance of the feed/photoperiod regimes and diets followed the same pattern. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Feeding regime, Growth, Photoperiod, Recirculation system, Feed conversion, Diet
in
Aquaculture
volume
292
issue
3-4
pages
225 - 231
publisher
Elsevier
external identifiers
  • scopus:67349094514
ISSN
0044-8486
DOI
10.1016/j.aquaculture.2009.04.028
language
English
LU publication?
no
id
2f9b58c2-a20e-47fe-9122-0b468b6cb692 (old id 1981399)
date added to LUP
2011-06-22 13:40:54
date last changed
2017-06-04 03:37:07
@article{2f9b58c2-a20e-47fe-9122-0b468b6cb692,
  abstract     = {The combined effect of feeding regime and photoperiod on the growth of juvenile Atlantic cod Gadus morhua in land-based recirculating aquaculture systems (RAS) was examined using three different commercial diets. Fish of 8-10 g were reared in 1 m³ tanks at an initial density of 10 kg m-³ for 78 d. Three RAS units were used to simultaneously test three feed/photoperiod regimes that might be encountered in the wild or aquaculture; LightDark (LD) 24:0, LD12:11 (+1 h crepuscular periods) and LD6:6 (+12 h crepuscular periods). Feed was administered during the light period every 30 min for a 3 min feeding duration. In each RAS unit three diets (A, B and C) were tested, which were broadly similar in composition but from different manufacturers. Water exchange rate averaged 10-19% in the three recirculation systems, and key water quality parameters such as NH4+ and CO2 remained at low effect concentrations (&lt;0.4 and &lt;3 mg L-1, respectively). Final stocking densities were 45-60 kg m-³. There was a significant influence of both feed/photoperiod regime and diet on specific growth rate (SGR). Fish receiving the LD12:11 and LD6:6 regimes and Diet A grew best (SGR 2.59 and 2.54 % d-1 respectively). Fish fed Diet B and C also grew best under the LD12:11 and LD6:6 feed/photoperiod regimes (SGR range of 2.41 – 2.46 % d-1). Conversely, fish kept in the LD24:0 feed/photoperiod regime grew relatively slowly irrespective of diet type (SGR range of 2.26 – 2.32 % d-1). The feed conversion performance of the feed/photoperiod regimes and diets followed the same pattern.},
  author       = {Fülberth, M and Moran, Damian and Jarlbæk, H and Støttrup, J.G},
  issn         = {0044-8486},
  keyword      = {Feeding regime,Growth,Photoperiod,Recirculation system,Feed conversion,Diet},
  language     = {eng},
  number       = {3-4},
  pages        = {225--231},
  publisher    = {Elsevier},
  series       = {Aquaculture},
  title        = {Growth of juvenile Atlantic cod Gadus morhua in land-based recirculation systems. Effects of feeding regime, photoperiod and diet},
  url          = {http://dx.doi.org/10.1016/j.aquaculture.2009.04.028},
  volume       = {292},
  year         = {2009},
}