کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2421615 1552845 2015 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Improved growth performance in rainbow trout Oncorhynchus mykiss reared at high densities is linked to increased energy retention
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم آبزیان
پیش نمایش صفحه اول مقاله
Improved growth performance in rainbow trout Oncorhynchus mykiss reared at high densities is linked to increased energy retention
چکیده انگلیسی


• Rainbow trout were reared at 25, 80 and 140 kg/m3.
• A higher routine metabolism, reduced feed utilisation efficiency and a tendency for lower growth were observed in 25 kg/m3.
• The results indicate bioenergetic advantages of crowding.

Behaviour has been suggested as an underlying factor influencing how rearing density affects growth performance in Salmonid fishes. At low densities there is an elevated intensity of aggressive interactions and the formation of dominance hierarchies. As density increases, it is commonly assumed that aggression decreases, as the cost and effort required to establish and maintain dominance hierarchies increase. The increased energy expenditure associated with aggressive interactions has been identified as one mechanism causing a reduced efficiency in feed utilisation and therefore decreased growth performance. Manipulating aggressive behaviour through density may have advantages from a practical perspective. In the present study the energetic expenditure of rainbow trout held at three densities, 25, 80 and 140 kg m− 3, were related to growth performance parameters. Measurements for growth performance and parameters of energetics were investigated at the three densities during a four week growth period. The results showed a significant increase in routine metabolism in fish reared at 25 kg m− 3 compared to groups reared at higher densities. The study concludes that in fish reared at density of 25 kg m− 3, a higher fraction of the dietary energy intake was used to fuel activity rather than growth, as evidenced by significantly higher routine metabolism, reduced feed utilisation efficiency and a tendency for lower growth performance compared to fish reared at the higher densities. These results indicate a bioenergetic advantage of crowding.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Aquaculture - Volume 442, 1 May 2015, Pages 69–73
نویسندگان
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