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The feed focus should always be fish dietary requirements
Cultured organisms should always be offered the feed that matches their requirements for nutrients and energy as closely as possible. The closer the match, the lower the potential for nutrients being lost to the environment.
Nutrient requirements, expressed as dietary concentrations in rations, differ considerably between species and within the species during their life cycle. This is mainly due to differences in the chemical composition of growing tissues.
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Species
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Reference
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Atlantic salmon (small)
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12
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2
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0.3
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Shearer et al. 1994
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Atlantic salmon (large)
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18
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18
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0.45
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Shearer et al. 1994
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Common carp
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16
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11-15
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-
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Schwarz et al.
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Rainbow trout (small)
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16
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5
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-
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Austreng 1976
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Rainbow trout (large)
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18
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14
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0.48
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Shearer 1984
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Seabass (small)
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17-18
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2-5
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-
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Perez et al 1997
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Sturgeon
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13
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11
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-
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Hung et al. 1997
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The protein content of the fish usually rises during early life stages. Fat content also varies considerably between species and between stages in the life cycle. The relative amount of skeletal and total mineral composition is also subject to change.
It will be clear to all those who take time to study this document that the competence of the fish feed manufacturer is crucial in the formulation of feeds that meet all the requirements of efficient fish growth, animal welfare and environmental sustainability. Biomar take responsibility extremely seriously as clearly expressed by our commitment to the vital areas of technical competence and state-of-the-art nutritional knowledge. We can sum this up as our contribution to optimise in the utilisation of the world's feed and food resources and to environmental sustainability in fish farming.
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