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All Journal Acta Aquatica: Aquatic Sciences Journal
Muzahar Muzahar
Aquaculture Department, Faculty of Marine and Fisheries, University of Maritim Raja Ali Haji, Kepulauan Riau, Indonesia.
Materials Science & Nanotechnology Other

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Growth of Kappaphycus alvarezii seaweed in off-bottom technique with different number of cultivation facilities Aripin Aripin; Muzahar Muzahar; Henky Irawan
Acta Aquatica: Aquatic Sciences Journal Vol. 12 No. 2 (2025): Acta Aquatica: Aquatic Sciences Journal
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v12i2.14485

Abstract

Seaweed or algae is macro algae whose habitat is in sea water and several types in brackish water. There are several seaweed cultivation techniques, one of which is the off-bottom technique. The off-bottom technique with different levels of cultivation facilities where seaweed seeds are placed has never been carried out by aquaculturis in the Bintan Island area, Riau Islands (Kepri). The aim of the research was to determine the speed of increase in weight of seaweed grown in cultivation facilities with different numbers of levels using the off-bottom technique. The research will be carried out in September-October 2022 on the sea coast of Tembeling Village, Bintan Regency. The experiment was carried out with three treatments and each was repeated 3 times in a completely randomized design. The treatments consisted of 1 level (K), 2 levels (A) and 3 levels (B) cultivation facilities. The Anova results showed that the weight gain of the seaweed test was significantly different between the three treatments (p<0.05). The best results in the 3 level cultivation facility treatment (B) were 11.04±0.73 g, but the survival and daily growth rates were not significantly different (p>0.05). Keywords: Off-Bottom Technique; Number of Different Levels of Cultivation Facilities
Comparative growth performance of Kappaphycus striatus and the green variety of Kappaphycus alvarezii under longline cultivation Muzahar Muzahar; T. Said Raza’I; Lily Viruly; Rika Wulandari; Shavika Miranti; Dwi Septiani Putri; Tri Yulianto; Okto Rimandi Bakkara; Henky Irawan; Daniel Sinaga; Jannesa Nasmi; Bherly Andia; Rio Saputra; Samsul Bahri; Ronaldy Lovina; David Darmawan; R. Muhammad Syafiq
Acta Aquatica: Aquatic Sciences Journal Vol. 12 No. 3 (2025): Acta Aquatica: Aquatic Sciences Journal
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 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
Co-Authors Aripin Aripin Bherly Andia Daniel Sinaga David Darmawan Dwi Septiani Putri Henky Irawan Henky Irawan Jannesa Nasmi Lily Viruly Okto Rimandi Bakkara R. Muhammad Syafiq Rika Wulandari Rio Saputra Ronaldy Lovina Samsul Bahri Shavika Miranti T. Said Raza’I Tri Yulianto