Krill is an important source of protein, omega-3 fatty acids and feed attractants which makes it a great ingredient in feeds for shrimp. Research is constantly done to learn how its dietary inclusion can give the best results. Late 2019, a study concluded that krill in fishmeal-challenged diets resulted in:
The Labomar scientists started out with a baseline diet of 3% fish meal, which was supplemented with either 3% krill meal, squid meal, shrimp head meal, squid liver meal, salmon meal (positive control diet), soy protein concentrate, or liquid sardine hydrolysate (5%). All of these ingredients are considered to be chemoattractants, meaning they induce or attract the shrimp toward it.
The shrimp in the study were fed their respective diets 10 times per day for 74 days. Following the feed trial, they were counted, weighed and their growth performance and feed efficiency were analyzed. The scientists also evaluated feed preference among the shrimp, by offering the shrimp two diets simultaneously in two separate feeding trays, evaluating which feed was the preferred choice.
Once weighed, the shrimp fed the krill meal diet had the highest body weight, followed by the positive control diet of salmon meal, and then the squid meal diet. The shrimp fed the sardine hydrolysate diet had the lowest body weight at the end of the trial.
Overall survival of the shrimp was unaffected by the various diets, though the highest gained yield resulted from diets containing krill meal and salmon meal. The scientists also reported that the lowest feed conversion ratio (FCR) was among the shrimp fed the krill meal supplemented diet, showing the efficiency of krill meal in the shrimp diet.