Comparing Body Density of Lumpfish (Cyclopterus lumpus) to Different Operational Welfare Indicators

Farmed lumpfish (Cyclopterus lumpus) are commonly used as cleaner fish in the salmonid aquaculture industry, but a knowledge gap exists with regards to their body density. Filling this is of importance, has no swim bladder and thus relies on alternative methods for buoyancy, i.e., density difference between its surroundings. The aims study were measure investigate correlation different operational welfare indicators. A total 138 sampled at five sites situated Faroe Islands. Weight water air was measured, calculated, assessed. average juvenile 1.030 g mL−1. Fulton’s K, stomach score, length negatively correlated density, while hepatosomatic index positively Liver colour groupings too broad final definitive conclusion. gained from might help industry improve understanding indicators lumpfish. Additionally, also husbandry feeding practices.