Smolt welfare during the transition from freshwater to seawater is a critical and vulnerable period in salmon aquaculture requiring careful management of physiological adaptation.
Smolt welfare represents a distinct and particularly vulnerable phase in the salmon production cycle. The physiological transformation of smoltification requires precise management conditions — incorrect timing, water quality, or transfer protocols create chronic osmotic stress that compromises welfare and immune function for months afterward. The intersection of handling stress from vaccination, transport loading, and sea transfer during this physiological transition creates cumulative welfare challenges. Evidence-based smolt readiness assessment before seawater transfer reduces the risk of failed smolts that suffer chronic welfare compromise. The smolt period welfare investment has downstream benefits for the entire marine production phase.