A method for producing a fermented aquaculture feed includes forming a powder mixture of soybean meal and earthworm meal, adding water to the powder mixture to form a first feed mixture, adding a culture of Bacillus subtilis to the first feed mixture to form a second feed mixture, and incubating the second feed mixture at a temperature of between about 20° C. and about 50° C. for a first time period to obtain a fermented feed mixture. The invention further provides a fermented feed mixture obtained from adding a culture of Bacillus subtilis to a feed mixture and incubating the feed mixture at a temperature of between about 20° C. and about 50° C. The feed mixture is obtained from adding water to a powder mixture of soybean meal and earthworm meal. The weight of the soybean meal within the power mixture may be larger than the weight of the earthworm meal.
