Sargassum Seaweed Boosts Rohu Fish Growth and Fungal Disease Resistance

Researchers find brown seaweed could replace antibiotics in aquaculture

A new study published in the Journal of Applied Phycology reveals that incorporating the brown seaweed Sargassum zhangii into fish feed can dramatically enhance growth, immunity, and disease resistance in rohu (Labeo rohita) fingerlings.

In a 10-week controlled trial, scientists supplemented fish diets with either raw or autoclaved S. zhangii at 2.5% and 5% inclusion levels. The group fed 5% raw S. zhangii displayed the most notable improvements — including faster growth, higher feed intake, and elevated antioxidant enzyme activity. These fish also demonstrated a strong immune response, with increased lysozyme and phagocytic activity and a reduced mortality rate (27%) when challenged with the pathogenic fungus Aphanomyces invadans, compared to 91% in untreated fish.

The findings suggest that seaweed-based feeds can serve as a safe, natural alternative to antibiotics, enhancing both productivity and health in freshwater aquaculture. The researchers recommend including 5% raw S. zhangii meal in rohu feed formulations.

This eco-friendly approach aligns with sustainable aquaculture practices by improving fish resilience while minimizing antibiotic dependency.

Reference

Sattanathan, G., Yu, H., Padmapriya, S., Deepa, B., Rajesh, R., Venkatalakshmi, S., & Mozanzadeh, M. T. (2025). Dietary Sargassum zhangii increased growth, hemato-immune responses and disease resistance against a fungal disease (Aphanomyces invadans) in Labeo rohita fingerlings. Journal of Applied Phycology. https://doi.org/10.1007/s10811-025-03647-1

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