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INDONESIA
Jurnal Natur Indonesia
Published by Universitas Riau
ISSN : 14109379     EISSN : 25030345     DOI : https://doi.org/10.31258/jnat
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Physics
Jurnal Natur Indonesia has been published since 1998, is a science journal that presents articles on research results, thoughts and views from researchers and experts in biosciences (basic science), including biology, physics, chemistry and mathematics. Jurnal Natur Indonesia involves reviewers who review each article according to their field of knowledge. The names and institutional origins of the Reviewers are listed on the normal two pages of each volume of publication. The journal is published twice a year, in April and October. In the field of biosciences (basic science) Biology, Physics, Chemistry, Mathematics.
Arjuna Subject : Biokimia, Genetika dan Biologi Molekuler - Biokimia, Genetika dan Biologi Molekuler (Lain-Lain)
Articles 84 Documents
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The Effect of Liquid Organic Fertilizer Made from Catfish Waste on the Biomass of Lemna sp in the Maintenance Media of Kissing Gourami (Helostoma temminckii) on Peat Water Nurhadi, Mhd Ilham; Syafriadiman, Syafriadiman; Hasibuan, Saberina
Jurnal Natur Indonesia Vol. 23 No. 2 (2025): October
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.23.2.85-95

Abstract

Peat water is acidic and nutrient-poor, thus less supportive for aquatic organisms. Lemna sp. has potential as both a phytoremediator and natural feed, but its growth depends on nutrient availability. Catfish waste can be fermented into liquid organic fertilizer (POC), rich in nitrogen, phosphorus, and potassium. This study aimed to examine the effect and optimal dosage of catfish-waste POC on the biomass of Lemna sp in peat water used for rearing kissing gourami (Helostoma temminckii). The research was conducted for 30 days, from March to April 2025, at the Environmental Quality Laboratory of Aquaculture, Faculty of Fisheries and Marine, Universitas Riau. The experimental method used a Completely Randomized Design (CRD) with five treatments and three replications. The treatments were: P0 (control, without POC), P1 (1.75 mL/L), P2 (2.0 mL/L), P3 (2.25 mL/L), and P4 (2.5 mL/L). The best result was obtained in treatment P3 (2.25 mL/L), with water quality values of temperature 26–30.4℃, pH 3.8–7.2, dissolved oxygen 4.54–7.37 mg/L, nitrate 0.39–15.86 mg/L, phosphate 3.06–6.05 mg/L, and CO₂ 5.0–10.0 mg/L. This treatment also produced a biomass increase of Lemna sp. of 107.6 g and a specific growth rate of 5.05%.
Species Inventory of Epilithic Macroalgae in Padang Unoi Coastal Waters, Simeulue Island Wahyuni, Sri; Mursawal, Asri; Usiani, Lulu; Kurniawan, Ronal
Jurnal Natur Indonesia Vol. 23 No. 2 (2025): October
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.23.2.108-115

Abstract

Epiphytic macroalgae are phototrophic organisms that attach to rigid substrates in the intertidal zone and serve as key components of coastal ecosystem structure due to their roles in providing habitat, stabilizing substrates, and supporting nutrient cycling. This study aimed to inventory the types of epiphytic macroalgae present in the rocky intertidal zone of Padang Unoi Village, Salang District, Simeulue Regency. Observations were conducted in July 2025 along a 150-m transect, dividing the area into two tidal zones: the lower littoral and the mid-littoral. The inventory revealed seven species of epiphytic macroalgae, namely Turbinaria sp, Sargassum sp, Padina sp, Chaetomorpha aerea, Caulerpa taxifolia, C. racemosa, and Amphiroa subcylindrica. Species from the Phaeophyta division dominated the mid-littoral zone, while Chlorophyta were more abundant in the lower littoral zone, and Rhodophyta were observed on coarse-textured rocky substrates. These three major divisions indicate habitat heterogeneity that supports the growth of various types of epiphytic macroalgae. The results of this study highlight the importance of the rocky intertidal zone of Simeulue as a productive habitat and provide a basis for sustainable coastal resource management
The Effect of Eucheuma cottonii Seaweed Flour Addition on the Preference Level of Dogol Shrimp Nuggets Hanun, Inas Maya Tamimah; Rostini, Iis; Haetami, Kiki; Pratama, Rusky Intan
Jurnal Natur Indonesia Vol. 23 No. 2 (2025): October
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.23.2.116-125

Abstract

This study aims to determine the effect of adding Eucheuma cottonii seaweed flour on the preference level of dogol shrimp (Metapenaeus monoceros) nuggets. Dogol shrimp nuggets have high protein content but are low in fiber, so adding seaweed flour as a dietary fiber source is expected to improve the nutritional value and product quality. The research used an experimental method with four treatments of seaweed flour addition to dogol shrimp nuggets: 0% (control), 1.5%, 2.5%, and 3.5%. Hedonic testing was conducted with 25 semi-trained panelists as replicates to evaluate sensory attributes (color, aroma, taste, and texture). Based on panelist preference level and Bayes test results, the priority product was subsequently analyzed through proximate analysis (moisture, protein, fat, and ash), crude fiber content, and texture testing (Texture Profile Analysis). The research showed that adding seaweed flour significantly affected the increase in fiber content. The treatment with 1.5% seaweed flour addition was the best treatment with moisture content values of 61.11%; protein 8.47%; ash 1.84%; fat 1.78%; crude fiber 2.15%; and texture analysis values of hardness 4,315.7523 gForce; fracturability not detected; springiness 0.8487%; cohesiveness 0.5813%; gumminess 2,500.1247 gForce; chewiness 2,110.6553 gForce; and resilience 0.2553%. The addition of Eucheuma cottonii seaweed flour to dogol shrimp nuggets can serve as an innovation in developing healthier fishery product processing that consumers prefer
Structure of Intestinal and Kidney Tissue of Carp (Cyprinus carpio) Maintained in Salinity Media and Feed Enriched with Guava Leaf Flour (Psidium guava) Pulungan, Amar Doli; Windarti, Windarti; Eddiwan, Eddiwan; Effendi, Irwan; Kurniawan, Ronal
Jurnal Natur Indonesia Vol. 23 No. 2 (2025): October
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.23.2.136-143

Abstract

Carp (Cyprinus carpio) is one of the freshwater fishery commodities with high economic value. Keeping carp in saline media can affect the osmoregulation system, impacting the performance of vital organs such as the intestines and kidneys. Such disturbances can potentially reduce fish's health and survival rate. One strategy that can be used to increase the fish's immune system is through feed supplementation with natural immunostimulants, one of which is guava leaf flour (Psidium guajava), which is known to contain bioactive compounds such as flavonoids, tannins, and saponins. This study aims to evaluate the effectiveness of guava leaf flour-enriched feed on the histological structure of the intestines and kidneys of carp raised in saline media and exposed to Aeromonas hydrophila bacterial infection. The study was conducted from August to October 2024 at the Biotechnology Laboratory, Faculty of Fisheries and Marine, Universitas Riau. The method used was an experiment with a completely randomized design (CRD) consisting of five guava leaf flour dosage treatments with three replicates. The results showed that the histological structure of the intestine in all treatments was relatively normal, with neatly arranged villi and round to oval goblet cells. However, in the guava leaf powder supplementation treatment, several abnormalities were found in the kidney tissue, including inflammation, hemorrhage, and necrosis. This indicates that the salinity factor has a greater effect on kidney damage than the effect of immunostimulant administration. Nevertheless, the administration of guava leaf powder still positively improved the immune response and survival rate of fish. The optimal dose was obtained in treatment P2 (15 g/kg feed) with a survival rate of 83.33–93.33%. The water quality parameters during the study were still within the acceptable range for aquaculture, namely temperature 28–31°C, DO 3.7–7.4 mg/L, and pH 5.5–7. Thus, it can be concluded that feeding fish with guava leaf flour-enriched feed is effective in maintaining intestinal histology and increasing the survival rate of carp in saline media, although it cannot completely prevent kidney damage caused by environmental factors

Page 9 of 9 | Total Record : 84

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