Dietary protein requirements for discus (Symphysodon spp.)

Citation
Asc. Chong et al., Dietary protein requirements for discus (Symphysodon spp.), AQUAC NUTR, 6(4), 2000, pp. 275-278
Citations number
20
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Aquatic Sciences
Journal title
AQUACULTURE NUTRITION
ISSN journal
1353-5773 → ACNP
Volume
6
Issue
4
Year of publication
2000
Pages
275 - 278
Database
ISI
SICI code
1353-5773(200012)6:4<275:DPRFD(>2.0.ZU;2-4
Abstract
Discus (Symphysodon spp.), a valuable ornamental species (mean initial weig ht 4.40-4.65 g) were fed five isoenergetic (gross energy: 200-209 kJ g(-1)) , semipurified diets (casein, gelatine and Danish fish meal as protein sour ces) twice a day to satiation for 12 weeks. Five levels of protein were eva luated (350, 400, 450, 500 and 550 g kg(-1) diet) and each fed to four repl icates. Growth rate increased significantly with protein level up to 500 g kg(-1) diet and then decreased. Feed conversion rates (FCRs) ranged from 2. 2 to 3.8, varying inversely with observed growth rate. A similar trend was also observed in the efficiency of protein utilization (PER). Analysis of d ose (protein level)-response (growth rate) with second order polynomial reg ression suggested a requirement of 449-501 g kg(-1).