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Putri, Dwi Septiani
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Comparative growth performance of Kappaphycus striatus and the green variety of Kappaphycus alvarezii under longline cultivation Muzahar, Muzahar; Raza’I, T. Said; Viruly, Lily; Wulandari, Rika; Miranti, Shavika; Putri, Dwi Septiani; Yulianto, Tri; Bakkara, Okto Rimandi; Irawan, Henky; Sinaga, Daniel; Nasmi, Jannesa; Andia, Bherly; Saputra, Rio; Bahri, Samsul; Lovina, Ronaldy; Darmawan, David; Syafiq, R. Muhammad
Acta Aquatica: Aquatic Sciences Journal Acta Aquatica, Vol. 12: No. 3 (December, 2025)
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
EFEKTIVITAS SUMBER NITROGEN PADA PUPUK ORGANIK YANG BERBEDA SEBAGAI SUBSTITUSI UREA PADA NUTRIEN KULTUR Nannochloropsis sp. Sinurat, Paulin; SINURAT, PAULIN BERNADET; Irawan, Henky; Putri, Dwi Septiani
Jurnal Intek Akuakultur Vol. 8 No. 1 (2026): Intek Akuakualtur
Publisher : Program Studi Budidaya Perairan Universitas Maritim Raja Ali Haji

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Abstract

Nitrogen is one of the nutrients needed Nannochloropsis sp., but there is no determination of fertilizer dosage based on fertilizer nitrogen source. This study aims to determine the provision of organic fertilizers capable of substituting urea in nutrient cultures Nannochloropsis sp. and effective used as a source of nitrogen for cell populations Nannochloropsis sp.. This research was conducted in April-May 2025 at the Batam Marine Aquaculture Center. This study used a complete randomized design (RAL) with 1 Control and 3 treatments, namely: control (50 mg/L Urea, Za, TSP, EDTA), treatment a (dung bats, Za, TSP, EDTA), treatment B (Quail Dung, ZA, TSP, EDTA), treatment C (Dung swallows, ZA, TSP, EDTA), each 3 replications. The observed parameters include daily density, population peak, doubling time, light intensity and water quality. Results showed for 7 days maintenance of cell density Nannochloropsis sp. the highest growth was found in h-5 maintenance with the highest growth in treatment B (quail droppings) is 23.193.055 cells/ml with the fastest doubling time is 36.3 hours and the lowest growth in control is 17.468.056 cells/ml with the longest doubling time is 52.3 hours. The peak population for control and all treatments is found on H-5 maintenance. The light intensity during the study ranged from 9.100 lux. This result shows that the fertilizer of bat droppings, quail droppings and bird droppings can be a substitution of urea and effective as a source of nitrogen in the nutrient culture Nannochloropsis sp. for cell populations Nannochloropsis sp..
Co-Authors Ahmad Zawawi, Muzahar Aminatul Zahra Andia, Bherly Anggraini, Aznika Dwi Apriandi, Azwin Baehaqi Bakkara, Okto Rimandi Daniel Sinaga, Daniel Darmawan, David Debi Rusadi Henky Irawan Irawan, Henky Jumsurizal Jumsurizal Khairunnisa Khairunnisa Lily Viruly Lovina, Ronaldy Muzahar Nasmi, Jannesa Putri, R.Marwita Sari Putri, Rika Fatmala Razai, Tengku Said Raza’i, T. Said Rika Fatmala Putri Rika Wulandari Samsul Bahri Saputra, Rio Sari, Dwi Ulta Sedran, Raja Rahmadoni Rizal Shavika Miranti Sinurat, Paulin SINURAT, PAULIN BERNADET Siswandi, Daud Sri Novalina Syafiq, R. Muhammad T. Ersti Yulika Sari Tetty, Tetty Tri Yulianto Wahyu Muzammil Wiwin Kusuma Atmaja Putra Yulia Oktavia