Effect of spirulina (Arthrospira platensis) supplementation on tilapia (Oreochromis niloticus) growth and stress responsiveness under hypoxia

Spanish Journal of Agricultural Research

José L. Garcia¹  Morris Villarroel²  Ignacio Plaza³ 

[1] CSIC, Centro de Investigaciones Biológicas, Biotecnología Medioambiental. C/ Ramiro de Maeztu 9, 28040 Madrid;Universidad Politécnica de Madrid, ETSIAAB, Dept. de Producción Agraria, Avda. Puerta de Hierro 2, 28040 Madrid;Universidad Politécnica de Madriid, y CSIC

关键词: fish;    feed additive;    two-choice;    behaviour;    non-invasive;   

DOI  :  10.5424/sjar/2018161-11698

学科分类：农业科学（综合）

来源: I N I A

【 摘 要 】

Several recent studies have shown thatArthrospirasp. supplementation of feeds has a beneficial effect on fish health and growth, but less is known about its possible effects on stress responsiveness. The present study was designed to evaluate usingArthrospira platensisas a feed supplement forOreochromis niloticusfry, reared in recirculating aquaculture systems. Two isocaloric and isonitrogenous fishmeal-based diets were prepared with 0% and 1%A. platensisand fed to fry, approximately 10 mg live weight at the beginning of the experimental period (n=16 tanks, 8 tanks per treatment), at a feeding rate of 6% live weight, four meals a day for 50 d. The weight gain per tank, specific growth rate and feed conversion ratio were similar among treatments butA. platensissupplementation significantly increased survival ( p <0.05). Stress responsiveness was measured in all fish from 12 tanks using a non-invasive two-choice test. All fish from one home tank (n=6 tanks per treatment), were placed into a shaded tank where oxygen levels were slowly reduced. A doorway was then opened to a second illuminated tank with normal oxygen levels and the number of fish that left the home tank were counted. The fish fedA. platensisstayed significantly ( p =0.001) longer in the home tank (30.20 min ± 13.22) than controls (17.35 min ± 8.32), suggesting a lower stress responsiveness and a higher tolerance to hypoxia.

【 授权许可】

Free