The effect of salinity and photoperiod on thermal tolerance and growth of Atlantic and coho salmon reared from smolt to adult in recirculating aquaculture systems. ...

• Main Author: Hines, Chandler William
• Format: Text
• Language: English
• Published: University of British Columbia 2019
• Subjects: Atlantic salmon; Salmo salar
• Online Access: https://dx.doi.org/10.14288/1.0380530; https://doi.library.ubc.ca/10.14288/1.0380530

Land-based, closed containment salmon aquaculture involves rearing salmon from smolt to adult in recirculating aquaculture systems (RAS). Unlike in open-net pen aquaculture, rearing conditions can be specified in RAS in order to decrease physiological stress. The environmental conditions that yield optimal growth and physiological stress tolerance in salmon are, however, unknown. To address this knowledge gap, we reared Atlantic (Salmo salar) and coho (Oncorhynchus kisutch) salmon in 7 separate RAS for 400 days post-smoltification under 2 photoperiods (12 or 24 hours of light) and 4 salinities (2.5, 5, 10 or 30 ppt) and assessed the effects of these conditions on growth and thermal tolerance. We found that salinity and photoperiod had significant effects on growth of Atlantic and coho salmon, but optimal conditions were not determined. Secondly, we found Atlantic salmon generally grew best under 24 hours of light until day 400 when the trend was lost and that coho salmon grew best under 12 hours of light in ...