First successful trial of seaweed (Kappaphycus alvarezii) cultivation in Karnataka, India

Abstract

This study highlights the successful raft-based cultivation of Kappaphycus alvarezii in the Yadamavinahole Estuary, Uppunda, Karnataka over a period of 72 days during pre-monsoon season (February to April, 2025). A total of 20 net tubes were deployed, yielding 180 kg of fresh biomass and the mean biomass per tube was 8.94±0.10 kg. The growth performance was promising with a specific growth rate of 2.06±0.04% day⁻¹ and a daily growth rate of 2.16±0.03% day⁻¹. Optimal water quality conditions supported consistent growth. The trial success underscores the potential for scalable seaweed farming in the region and provides essential insights for enhancing future commercial cultivation practices.