The valorisation of shrimp processing by-products could become a strategic tool to improve production efficiency and advance circular economy principles in aquaculture.
¡A new study published in Aquaculture International shows that graded inclusion of shrimp head meal in digestible-based diets significantly improves growth performance, feed conversion and physiological resilience in Nile tilapia (Oreochromis niloticus).
The trial assessed five inclusion levels (0, 5, 10, 15 and 20%) in isonitrogeneous and isoenergetic diets over a 45-day feeding period. Results revealed a clear and consistent improvement in productive performance as inclusion increased, with a marked reduction in feed conversion ratio and enhanced protein efficiency. Quadratic regression analysis estimated an optimal inclusion level of approximately 16% to maximise weight gain and feed conversion efficiency.
Beyond growth, the study identified important physiological effects. Fish fed intermediate and high inclusion levels showed increased digestive enzyme activity, greater intestinal villus heigh and enhanced antioxidant defences in liver and muscle tissues. Haematological and biochemical parameters also suggested improved immune competence and reduced metabolic stress.
A key methodological strength of the study lies in the formulation of diets based on digestible protein and energy, overcoming traditional concerns regarding ash and chitin content in shrimp by-products. In this context, shrimp head meal acted not merely as a protein substitute but as a functional ingredient capable of modulating digestive physiology, lipid metabolism and antioxidant status.
Given that industrial shrimp processing generates between 35% and 60% solid waste, its effective integration into aquafeeds represents a clear opportunity to reduce environmental impacts and fishmeal dependence, aligning aquaculture production with circular bioeconomy strategies.
Although conducted in tilapia, the authors suggest that digestible-based formulation approaches may facilitate evaluation in other commercially important species.
Reference:
Heluy, G.M., da Silva, M.A., Vasconcelos, V.C., de Souza, D.L., dos Santos, G.M., de Arcanjo, J.D.C., do Nascimento, B.E.G., de Araújo, M.T., Cahú, T.B., de Veras, B.O., Costa, R.M.P.B., Cavalli, R.O., Ludke, M.C.M.M., dos Santos, J.F., & Bezerra, R.S. (2026). Graded inclusion levels of shrimp head meal in digestible-based diets improve nutrient utilization and physiological responses in Nile tilapia (Oreochromis niloticus) fingerlings.
Aquaculture International, 34:79. https://doi.org/10.1007/s10499-026-02466-6
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