Refining approaches to measuring, monitoring and appraising animal welfare in aquaculture research is key to (i) protecting and optimizing it, (ii) documenting the severity of how and when it deviates, and (iii) ensuring good scientific quality, reliable results and reproducibility, amongst other factors. However, different fish species and life stages can have varying welfare needs and assessing their welfare can be challengi...

Injuries from lice treatments are ranked as a major cause of mortality and poor welfare for Atlantic salmon in marine net pens. As a result, scoring schemes based on the external appearance of injuries and severity are now frequently used. One such recently developed scheme for farmed salmon is the LAKSVEL protocol, inspired by previous schemes such as the SWIM models and the FISHWELL scoring system. Here we review the injury‐...

Triploid fish are usually sterile, a trait which reduces unwanted sexual maturation in fish farming and eliminates the risk for negative genetic effects of escapees on wild stocks. The triploid state, normally established through a doubling of the maternal genome, consists of two chromosome sets from the mother and one from the father. The increase in genome size is accompanied by an increase in cell volume and reduction in ce...