Journal: Aquaculture Nutrition, vol. 13, p. 241–255, 2007
Publisher: Blackwell Publishing
International Standard Numbers:
Open Access: none
The effects of partial replacement of fish meal (FM) with meal
made from northern krill (Thysanoessa inermis), Antarctic krill
(Euphausia superba) or Arctic amphipod (Themsto libellula) as
protein source in the diets for Atlantic salmon (Salmo salar L.)
and Atlantic halibut (Hippoglossus hippoglossus L.) on growth,
feed conversion, macro-nutrient utilization, muscle chemical
composition and fish welfare were studied. Six experimental
diets were prepared using a low-temperature FM diet as control.
Theother diets included northern krill where 20, 40 or60%
of the dietary FM protein was replaced with protein from
northern krill, and two dietswhere theFMprotein was replaced
with protein from Antarctic krill or Arctic amphipod at 40%
protein replacement level. All diets were iso-nitrogenous and
iso-caloric. Atlantic salmon grew from 410 g to approximately
1500 g during the 160 day experiment, and Atlantic halibut
grew from 345 g to 500–600 g during the 150 day experiment.
Inclusion of krill in the diets enhanced specific growth rate in
salmon, especially during the first 100 days (P < 0.01), and in a
dose–response manner in halibut for over the 150 day feeding
period (P < 0.05). Feed conversion ratio did not differ between
dietary treatments, and no difference was found in dry matter
digestibility, protein digestibility and fish muscle composition.
Good growth rates, blood parameters within normal ranges
and low mortalities in all experimental treatments indicted that
fish health was not affected either Atlantic salmon or Atlantic
halibut fed the various zooplankton diets.