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Figure 3. Replacement of corn protein concentrate or fishmeal with NexPro in a green water environment for Pacific white shrimp.

shrimp per tank. Initial research focused on maximizing inclusion rates with levels up to 30% of the diet being tested. In these studies, researchers found slightly higher final biomass per tank for the NexPro-fed treatments compared to the control (Qui et al., 2017). Subsequent research examined the use of NexPro as an alternative to fishmeal, with NexPro replacing a combination of fishmeal and soybean meal. Diets contained 12%, 9%, 6%, 3%, and 0% fishmeal, and 0%, 6%, 12%, 18%, and 24% NexPro, respectively. Final weights were greatest for shrimp that were fed the 6% NexPro diet, followed by the 12% diet, but were only significantly increased compared to the 24% NexPro diet (Qui et al., 2017; experiment 3). Note that the control diet was not statistically different from any of the treatment diets for final weight. More recent research conducted with NexPro in shrimp diets have used an outdoor green water recirculating aquaculture system with 30 shrimp per tank and four replications per treatment. This research evaluated the ability to use NexPro to replace either fishmeal or corn protein concentrate. The result of this research showed that a shrimp diet completely replacing corn protein concentrate at a 12.6% inclusion with a 20% inclusion of NexPro (Fig. 2) produced no difference in final weights. The same result was observed when reducing fishmeal from 17.4% to 6% inclusion, while replacing it with a 15% NexPro inclusion. Note that performance could not be maintained at the lowest fishmeal inclusion level (2.21% fishmeal; Fig. 3). Overall, this research demonstrated that in shrimp

diets, fishmeal inclusions could be reduced to just 6% of the diet while simultaneously adding up to 15% NexPro, and growth performance would not be affected.

Conclusions We conclude that if formulated properly, NexPro can replace higher-cost protein ingredients without a reduction in growth performance in common aquaculture production operations. Multiple studies have independently demonstrated that the product can be used as a substitute to high cost ingredients like fishmeal and protein concentrates. In the most recent shrimp study, feed cost savings per metric ton of $43, to $85 were obtained for diets replacing corn protein concentrate with NexPro. Diets replacing fishmeal with NexPro showed a savings of $77 to $153 per metric ton. Given both animal growth performance and opportunities for substantial feed cost savings, Flint Hills Resources recommends using up to 15% NexPro in shrimp and tilapia feed formulations. References available on request. More information: Scott Tilton, Ph.D., provides research and technical support for Flint Hills’ Ingredients business. Manager of Nutrition Services Flint Hills Resources, USA E:

Aquafeed: Advances in Processing & Formulation Vol 11 Issue 3 2019

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Aquafeed vol 11 issue 3 2019