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All Journal Sains Akuakultur Tropis : Indonesian Journal of Tropical Aquaculture PENA AKUATIKA : JURNAL ILMIAH PERIKANAN DAN KELAUTAN Journal Neosantara Hybrid Learning Jurnal Perikanan
Wulan, Dyah Retno
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Computer Science & IT Earth & Planetary Sciences Education Languange, Linguistic, Communication & Media Social Sciences Other

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The Potential of Biostimulants to Enhance the Growth of Kappaphycus alvarezii (Rhodophyta) Propagules Fadilah, Siti; Septiana, Shinta; sumiarsih, Sumiarsih; Wulan, Dyah Retno; khaerudin, Khaerudin; Prama, Ega Aditya; Putri, Lala Priyantika Adinda
Sains Akuakultur Tropis : Indonesian Journal of Tropical Aquaculture Vol 9, No 1 (2025): SAT edisi Maret
Publisher : Departemen Akuakultur FPIK UNDIP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/sat.v9i1.25348

Abstract

Kappaphycus alvarezii is a globally significant tropical red seaweed renowned for its carrageenan content. While tissue culture is a valuable technique for enhancing seedling quality and stress resilience in vegetative propagation, it is time-consuming and costly. Biostimulants have demonstrated the potential to enhance plant growth. This study aimed to evaluate the potential of biostimulants in enhancing the growth of K. alvarezii propagules. Three different biostimulant products were tested: biostimulant A (amino acid-based), biostimulant B (bacteria-based), and biostimulant C (seaweed extract-based). Each biostimulant was applied at two different concentrations and compared to a negative control and a positive control. Artificial seawater enriched with PES and supplemented with biostimulants according to the treatment was used as the growth medium. Growth of K. alvarezii propagules was monitored weekly, with the primary parameters being propagule weight and specific growth rate. Growth medium quality was assessed by in situ pH measurements and ex situ nitrate and phosphate analyses. Fermented biostimulants negatively impacted growth by reducing the pH of the culture medium, while biostimulant B (photosynthetic bacteria) maintained a near-neutral pH and showed the most promising results, with treatment B2 displaying stable growth and treatment B1 achieving the highest specific growth rate at week 6. Though treatments A1 and A2 showed higher nitrate and phosphate concentrations, these did not correlate with improved growth, likely due to the low pH. While these findings suggest the potential of photosynthetic bacteria for K. alvarezii growth, further research is necessary to fully understand the underlying mechanisms and to develop strategies to overcome the limitations associated with the acidic nature of fermented biostimulants.
From Teacher to Facilitator: The Role of Educators in Supporting Heutagogical Practices in Higher Education Khairani, Misbahul; Huda, Nurul; Razak, Faisal; Wulan, Dyah Retno
Journal Neosantara Hybrid Learning Vol. 3 No. 1 (2025)
Publisher : Yayasan Pendidikan Islam Daarut Thufulah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70177/jnhl.v3i1.2173

Abstract

The rapid evolution of educational paradigms in the 21st century has underscored the necessity for a shift from traditional teacher-centered instruction to more learner-driven approaches, such as heutagogy. Heutagogy emphasizes self-determined learning, where learners are empowered to take control of their educational journey. This study aims to explore the evolving role of educators in higher education as they transition from knowledge transmitters to facilitators of autonomous learning within heutagogical frameworks. Employing a qualitative approach, data were collected through in-depth interviews and focus group discussions involving 15 university lecturers across various disciplines. Thematic analysis revealed that educators play a pivotal role in designing flexible learning environments, fostering learner agency, and integrating digital tools to support independent learning pathways. Challenges identified include institutional constraints, limited professional development, and resistance to pedagogical change. However, the findings indicate that with proper training and institutional support, educators can effectively adapt their roles to facilitate heutagogical practices. The study concludes that the transformation of educators into facilitators is crucial for nurturing self-determined learners capable of navigating complex and dynamic knowledge landscapes.
Pengaruh Salinitas Berbeda Terhadap Daya Tetas Telur Udang Vaname (Litopenaeus vannamei) Hidayah, Elmi; Anggoro, Agung Doni; Wulan, Dyah Retno; Satriyanto, Budi; Rinjani, Gudhia Dunnya
Pena Akuatika : Jurnal Ilmiah Perikanan dan Kelautan Vol. 24 No. 1 (2025): PENA AKUATIKA JURNAL ILMIAH PERIKANAN DAN KELAUTAN
Publisher : Fakultas Perikanan Universitas Pekalongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31941/penaakuatika.v24i1.4975

Abstract

Salinitas  sangat berpengaruh pada budi daya perikanan air laut maupun air payau. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh kisaran kadar garam (salinitas) yang baik pada daya tetas telur udang vaname (Litopenaeus vannamei), sebagai acuan nantinya pada proses pembenihan udang vaname di fase peneluran. Metode pengambilan data ini menggunakan percobaan Rancangan Acak Lengkap (RAL) yang terdiri dari 4 perlakuan yaitu salinitas 28 ppt, salinitas 32 ppt, salinitas 34 ppt dan 3 kali ulangan dengan jumlah telur per pengulangan 200 butir. Alur proses penelitian ini diawali dengan persiapan peralatan (Bak / kolam, seser, refraktometer, dll) yang dibutuhkan, tahap selanjutnya yaitu penyediaan telur udang vaname sebagai bahan penelitian, dan tahap terakhir yaitu melakukan pengamatan penelitian. Hasil penelitian menunjukan salitinas 32 ppt mendapatkan hasil terbaik dimana pembelahan sel sangat optimal dan waktu yang diperlukan lebih singkat yaitu 8 jam 43 menit dengan nilai rata-rata HR 84-91% tidak terdapat naupli yang abnormalitas dan naupli berenang aktif.
THE USE OF CLOVE OIL (Syzygium aromaticum) AS AN ANESTHETIC TO THE SURVIVAL RATE OF VANAME (Litopenaeus vannamei) POSTLARVAE IN TRANSPORTATION Anggoro, Agung Doni; Rasnijal, Muhammad; Umidayati, Umidayati; Wulan, Dyah Retno; Yernawilis, Yernawilis
Jurnal Perikanan Unram Vol 15 No 6 (2025): JURNAL PERIKANAN
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jp.v15i6.2005

Abstract

This study employed a Completely Randomized Design (CRD) consisting of four treatments with three (3) replications, resulting in a total of twelve (12) experimental units: P1 0%, P2 0.10%, P3 0.20%, and P4 0.30%. The use of clove oil doses on shrimp seed survival during closed transportation showed significant differences among the treatment groups, where P < 0.05. Survival rates for each treatment were as follows: P1 at 53.1%, P2 at 87.9%, P3 at 88.7%, and P4 at 62.4%. Based on measurements of water quality parameters during the study, the conditions in the plastic bag containers after 24 hours of transportation remained within tolerance limits that support shrimp seed maintenance. The post-transport water quality values were: temperature 29.38–29.41°C, dissolved oxygen 4.70–4.75 ppm, and pH 7.30–7.39.
Co-Authors Anggoro, Agung Doni Budi Satriyanto Hidayah, Elmi Khaerudin Khaerudin Khairani, Misbahul Nurul Huda Prama, Ega Aditya Putri, Lala Priyantika Adinda Rasnijal, Muhammad Razak, Faisal Rinjani, Gudhia Dunnya Septiana, Shinta siti fadilah Sumiarsih Sumiarsih, Sumiarsih Umidayati, Umidayati Yernawilis, Yernawilis