Effects of dietary energy content on the voluntary feed intake and blood parameters of sea bass (Dicentrarchus labrax L.)

Italian Journal of Animal Science

关键词: Sea bass, High energy diet, Energy ingestion, Growth rate, Body composition;   

DOI  :  10.4081/ijas.2003.181

来源: DOAJ

【 摘 要 】

Energy and protein requirements of sea bass for maximum growth and fasting energy requirements were determined by
using three diets containing increasing DE levels and two fish weights.
Five hundred and sixteen sea bass were divided in two body weight (BW) classes (A: 67.7 ± 0.85g and B: 128.6 ± 0.88g,
mean ± SD live weight) and randomly distributed among 24 tanks. They were fed for 12 weeks on three isoproteic diets
characterized by different levels of digestible energy (DE): low energy (LE), 18.6; medium energy (ME), 19.7; and high
energy (HE), 22.6 MJ kg-1 dry matter (DM). The entire trial lasted 113 d and was divided into two periods: a feeding trial
of 83 d and a fasting trial of 30 d. Specific growth rates decreased in fish fed on the HE diet (P < 0.05), but only in fish
weighing 68 g. Voluntary feed intakes and feed conversion ratios were inversely related to dietary energy contents in both
weight classes. During the starvation trial, body depletion increased (P<0.05) in fish fed on high-energy diets during the
feeding experiment. The gross energy requirements (per day) for maximum growth were 320 and 221 kJ kg-1 BW for fish
weighing 68 g and 128 g, respectively. Fasting metabolisms were 60.6 and 54.1 kJ kg–0.83 BW per day for fish weighing 68g
and 128g, respectively.
It is concluded that growth performance of sea bass appear to be dependent on digestible dietary energy. Gross energy
intake, net energy (production) and maintenance requirements of fish were not influenced by dietary treatments.

【 授权许可】

Unknown