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Behaviour represents a reaction to the environment as fish perceive it and is therefore a key element of fish welfare. This review summarises the main findings on how behavioural changes have been used to assess welfare in farmed fish, using both functional and feeling-based approaches. Changes in foraging behaviour, ventilatory activity, aggression,(More)
Pertinent experimental work and literature relative to drowning are reviewed. The different concepts of the mechanism of drowning are dealt with and the view is emphasized that asphyxia is complicated by hemodilution in fresh water and by hemo-concentration in salt water, with resulting electrolyte imbalance. A short description is given of the sequence of(More)
Fish can be the recipients of numerous injuries that are potentially deleterious to aquacultural production performance and welfare. This review will employ a systematic approach that classifies injuries in relation to specific anatomical areas of the fish and will evaluate the effects of injury upon production and welfare. The selected areas include the(More)
Increased aquaculture production has raised concerns about managing protocols to safeguard the welfare of farmed fish, as consumers demand responsible aquaculture practices to provide ‘welfare friendly’ products. Feeding is one of the largest production cost in a fish farm and can be one of the biggest stressors for fish. Under farming conditions, fish are(More)
Self-feeding systems, where fish actuate a trigger to obtain food, may be a useful tool in aquaculture feed management programs as they can reduce food wastage, whilst improving growth and food conversion ratio’s. Furthermore, feeding on-demand can also reduce competition and fin damage. Fin damage (especially to the dorsal fin) can be caused by aggression,(More)
Following the development of demand-feeding systems, many experiments have been conducted to explore feeding motivation and feed intake in farmed fish. This work aims to review a selection of studies in the field, focusing on three key factors, related to demand feeding and fish welfare. Firstly, we outline how demand feeders should be considered when(More)
Data on canopy trees (stems ≥ 15 cm DBH) in riparian wetlands, spanning from headwaters to large river floodplains, were used to test whether forest canopy composition differed among hydrogeomorphic (HGM) riverine subclasses and among physiographic sub-regions (Major Land Resource Areas; MLRA) within a given HGM subclass. Riverine stands (n = 225) were(More)