The aim of the experiment was to evaluate the growth and survival of larval Atlantic sturgeon fed microworms (Panagrellus sp.) and brine shrimp nauplii (Artemia sp.). The experiment was conducted at the Department of Sturgeon Breeding in Pieczarki of the Inland Fisheries Institute in Olsztyn. The experimental material comprised larval Atlantic sturgeon 22 days post hatch that were already feeding. The fish were stocked into nine tanks with a volume of 40 l each that were included in a recirculation system. The fish were divided into three experimental groups: group A was fed brine shrimp nauplii; group A+N was fed brine shrimp nauplii and microworms; group N was fed microworms. The fish from the group fed only brine shrimp nauplii attained the greatest body growth (0.068 g) and the highest survival (43.3%). Fish from group A+N, which received mixed feed, attained similar results for both growth and survival to that in group A (0.061 g and 33%). Differences between these two groups were not statistically significant (P > 0.05). The weakest results were obtained for the group fed only microworms. The fish from this group had a final body weight of 0.045 g and survival of 1.7%. The differences in these parameters among the groups were statistically significant (P < 0.05). The current experiment permits concluding that, at the moment, feeding microworms exclusively does not produce the anticipated results. Brine shrimp nauplii was a substantially better feed choice for larval Atlantic sturgeon. However, in both instances, further experiments must be performed before the precise daily ration or the manner in which the ration is divided over the day is determined. This information could improve the results of rearing substantially.
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