Comparative growth performance of Kappaphycus striatus and the green variety of Kappaphycus alvarezii under longline cultivation

Authors

  • Muzahar Muzahar Aquaculture Department, Faculty of Marine and Fisheries, University of Maritim Raja Ali Haji, Kepulauan Riau, Indonesia. http://orcid.org/0000-0001-7990-1327
  • T. Said Raza’I Program Studi Magister Ilmu Lingkungan, Universitas Maritim Raja Ali Haji, Tanjungpinang
  • Lily Viruly Program Studi Teknologi Hasil Perikanan, Universitas Maritim Raja Ali Haji, Tanjungpinang
  • Rika Wulandari Program Studi Budidaya Perairan, Universitas Maritim Raja Ali Haji, Tanjungpinang
  • Shavika Miranti Program Studi Budidaya Perairan, Universitas Maritim Raja Ali Haji, Tanjungpinang
  • Dwi Septiani Putri Program Studi Budidaya Perairan, Universitas Maritim Raja Ali Haji, Tanjungpinang
  • Tri Yulianto Program Studi Budidaya Perairan, Universitas Maritim Raja Ali Haji, Tanjungpinang
  • Okto Rimandi Bakkara Program Studi Budidaya Perairan, Universitas Maritim Raja Ali Haji, Tanjungpinang
  • Henky Irawan Program Studi Budidaya Perairan, Universitas Maritim Raja Ali Haji, Tanjungpinang
  • Daniel Sinaga Program Studi Budidaya Perairan, Universitas Maritim Raja Ali Haji, Tanjungpinang
  • Jannesa Nasmi Program Studi Budidaya Perairan, Universitas Maritim Raja Ali Haji, Tanjungpinang
  • Bherly Andia Program Studi Magister Ilmu Lingkungan, Universitas Maritim Raja Ali Haji, Tanjungpinang
  • Rio Saputra Program Studi Magister Ilmu Lingkungan, Universitas Maritim Raja Ali Haji, Tanjungpinang
  • Samsul Bahri Program Studi Magister Ilmu Lingkungan, Universitas Maritim Raja Ali Haji, Tanjungpinang
  • Ronaldy Lovina Program Studi Magister Ilmu Lingkungan, Universitas Maritim Raja Ali Haji, Tanjungpinang
  • David Darmawan Program Studi Budidaya Perairan, Universitas Maritim Raja Ali Haji, Tanjungpinang
  • R. Muhammad Syafiq Program Studi Budidaya Perairan, Universitas Maritim Raja Ali Haji, Tanjungpinang

DOI:

https://doi.org/10.29103/aa.v12i3.21565

Abstract

This study compares the growth of two seaweed species, Kappaphycus striatus and Kappaphycus alvarezii (green variety), using the longline method in the waters of Pelakak Village, Lingga Regency. This research aims to identify differences in daily growth rates and environmental factors affecting the productivity of both seaweed species. The study was conducted over 45 days using a randomized block design with two treatments and four replications. Measured parameters included absolute weight growth, specific growth rate, and water quality. The results showed that K. alvarezii (green variety) exhibited a higher daily growth rate (0.55% weight/day) compared to K. striatus (0.31% weight/day). Environmental factors such as temperature (28–30°C), salinity (30–31 ppt), and pH (7.1–7.4) were within the optimal range, but the current velocity (0.4–0.5 m/s), which exceeded the standard, potentially inhibited growth an increased the risk of talus damage. The t-student test indicated no significant difference in growth between the two seaweed species (p>0.05). These findings suggest that K. alvarezii (green variety) is more adaptive to local environmental conditions than K. striatus, although current velocity and pest presence remain challenges in seaweed cultivation. This study contributes to optimizing seaweed farming strategies in coastal areas.

Keywords: Growth; Kappaphycus striatus; Kappaphycus alvarezii Green Variety; Longline

Author Biography

Muzahar Muzahar, Aquaculture Department, Faculty of Marine and Fisheries, University of Maritim Raja Ali Haji, Kepulauan Riau, Indonesia.

Aquaculture Department

References

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Published

2025-12-01

Issue

Acta Aquatica, Vol. 12: No. 3 (December, 2025)

Section

Articles

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