Dietary protein requirement of juvenile marbled spinefoot rabbitfish Siganus rivulatus

作者：El Dakar Ashraf Y; Shalaby Shymaa M; Saoud I Patrick^*

来源：Aquaculture Research, 2011, 42(7): 1050-1055.

DOI：10.1111/j.1365-2109.2010.02694.x

• rabbitfish
• Siganus rivulatus
• protein requirement

Rabbitfish are an Indo-Pacific herbivorous marine fish that have good market demand and are suitable for aquaculture. The present work was performed to determine dietary protein inclusion necessary for optimal growth of juvenile rabbitfish Siganus rivulatus. Six diets with increasing levels of protein (10, 20, 30, 40, 50 and 60 g crude protein 100 g(-1) feed) and similar levels of gross energy (20 MJ kg(-1)) were prepared and offered to S. rivulatus juveniles maintained in triplicate cages placed in two large water tanks for 49 days. Growth progressively improved with dietary protein for fish offered diets from 10% to 40% protein inclusion. Diets with greater protein levels did not improve fish growth beyond that observed in the 40% group. Daily feed intake, apparent protein utilization and feed conversion ratio decreased as dietary protein increased. Protein efficiency (PE) was greatest (1.47) in fish offered the 10% protein diet and least in fish offered the 60% protein diet (0.80). No differences in PE were observed among all other treatments (20-50%). Results of the present work suggest that minimum dietary requirement for suitable growth of S. rivulatus juveniles is 40% protein when digestible energy of the diet is 16-18 MJ kg(-1).

• 出版日期2011-6