B.P. North

TL;DR: There is increasing public, governmental and commercial interest in the welfare of intensively farmed fish and stocking density has been highlighted as an area of particular concern, and there are contradictory recommendations in the literature for key water quality parameters to ensure adequate welfare status.

TL;DR: The evidence for stronger dominance hierarchies in the 10 kg m − 3 treatment, indicate that low as well as high stocking densities have the potential to adversely affect trout welfare.

TL;DR: Exposure of different developmental stages of rainbow trout to periods of constant light from autumn to spring appeared to enhance growth rates and could improve feed conversion, and exposure to higher light intensities appeared to promote greater growth and feeding efficiency in all stages of production.

TL;DR: 6-point photographic scales have been designed for rapid quantitative assessments of fin size, covering the range of fin damage observed on rainbow trout on UK farms, and show that scoring is consistent both within and between operators.

TL;DR: The current results suggest that triploidy does not affect the ability of non-smolting trout to adapt to full strength seawater under optimum conditions, and that the osmotic and stress response to such transfer is similar to diploids.