Comparison between Atlantic salmon Salmo salar post-smolts reared in open sea cages and in the Preline raceway semi-closed containment aquaculture system.

摘要: The use of closed containment (CCS) or semi-closed systems (S-CCS) for Atlantic salmon Salmo salar aquaculture is under evaluation in Norway. One such system the Preline S-CCS, a floating raceway that pumps water from 35 m depth creating constant current through system. Exposing fish to moderate currents considered aerobic exercise and it often perceived as positive welfare, growth, food utilization, muscle development cardiac health. present study compared reared S-CCS reference open pen. Samples were taken fresh before being transferred seawater after 1, 2 4 months analysed mortality, plasma insulin-like growth factor I (IGF-I) levels. Moreover, gene transcription determined skeletal [igf-I, 1 receptor (igf1ra) binding protein 1a (igf1bp1a)] factors [myocyte-specific enhancer 2C (mef2c), gata4 vascular endothelial (vegf)]. While results suggest post-smolts smaller than fish, have less accumulated mortality at end experiment showed 2.44 times more small fibres group seawater. These confirmed what was previously observed second generation Preline. Similar levels big between similar hypertrophy even with lower IGF-I expression S-CCS. Cardiac suggests group. Altogether, promising technology able produce robust S. faster subsequent standard cage period.