Article Per Year (5 Year)
p-Index From 2019 - 2024
0.817
P-Index
This Author published in this journals
All Journal Akuatik: Jurnal Sumberdaya Perairan Jurnal Serambi Engineering Journal of Fish Nutrition Depik Jurnal Ilmu-Ilmu Perairan, Pesisir, dan Perikanan
Rachmawati Rusydi
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Engineering Environmental Science

Published : 5 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 5 Documents
Search

 1 
Pemodelan Status Trofik Danau Laut Tawar Aceh Tengah Saiful Adhar; Erlangga Erlangga; Rachmawati Rusydi; Mainisa Mainisa; Munawwar Khalil; Muliani Muliani; Eva Ayuzar; Muhammad Hatta
Jurnal Serambi Engineering Vol 7, No 2 (2022): April 2022
Publisher : Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32672/jse.v7i2.4022

Abstract

The trophic status of Laut Tawar Lake was increasingly leading to an alarming level of degradation. Efforts to anticipate an increase in trophic status require scientific knowledge of the trophic phenomena of the waters empirically. This research examines the trophic status parameters to produce a model of the trophic status of Laut Tawar Lake. The proposed model was a modification of Carlson's Trophic State Index Method. Analysis of the relationship examined the interaction of water clarity (SD) with chlorophyll-a (Chl), Total Suspended Solid, and Total Dissolved Solids, and the interaction of chlorophyll-a with nutrient concentration (TP, TN). Data were analyzed descriptively quantitatively, correlation, and regression. The results showed that the waters of Laut Tawar Lake contain phosphate (TP) 34 µg/L, Total Nitrogen 687 µg/L, chlorophyll-a 10 µg/L, Total Suspended Solid 47 mg/L, Total Dissolved Solid 84 mg/L, and water clarity 4.0 m. The regression test showed that the abundance of phytoplankton (Chl) was affected by nutrient phosphate with the empirical model equation Chl = 0.565 TP – 9.161. Nitrogen nutrients did not partially affect the concentration of chlorophyll-a in the waters of Laut Tawar Lake. Water clarity is influenced by chlorophyll-a and TSS, where TDS has no effect partially. The empirical model obtained is Ln SD = 1.757 – 0.013 Chl – 0.008 TSS. Modification of Carlson's TSI by substituting the two equations obtained the equation TSIdlt = 13.46 + 8.08 ln TP + 0.04 TP + 0.04 TSS. This model simulation gives an estimation rate of 91.06%.
Analisa Limbah Fosfor Kegiatan Keramba Jaring Apung di Danau Laut Tawar Aceh Tengah Saiful Adhar; Rachmawati Rusydi; Mainisa Mainisa; Erlangga Erlangga; Munawwar Khalil; Eva Ayuzar
Jurnal Serambi Engineering Vol 6, No 3 (2021): Juli 2021
Publisher : Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32672/jse.v6i3.3051

Abstract

Floating net cage activities can cause  water quality to decrease. The feed remains and the metabolism of the fish  from these activities produces nitrogen and phosphorus .  The objective of this study  is to obtain the calculation model and the amount of phosphorus released into the waters of Laut Tawar Lake  as a result of floating  cage activities. The resulting  formula  was Pw = (F x [P]p) – ((It – Io) x [P]i), where their variables were given feed (F), phosphorus concentration of feed ([P]p), the final weight of fish (It), the initial weight of fish (Io), and phosphorus concentration in fishes ([P]i). It can be used to predict the increase in phosphorus waste based on the increase in floating net cage area. The weight of tilapia increases exponentially with the  day of cultivation in the equation Y = 12.70e0.02x and the goldfish followed the formula  Y = 2.28e0.03x. Phosphorus in tilapia varies  from 1.58% to 2.23% with an average of 1.97%. Goldfish contain  1.19 - 2.02% phosphorus, with an average of 1.52%. Goldfish  growth  was not optimal due to inadequate feeding,   so  without excessive feeding and did not generate  phosphorus waste. The cultivation of  tilapia releases  0.09 Kg P/m2 of phosphorus waste from floating cages .
KARAKTERISTIK MIKROSKOPIS DAN KOMPONEN BIOAKTIF TANAMAN GENJER (Limnocharis flava) DARI SITU GEDE BOGOR AGOES M. JACOEB; ASADATUN ABDULLAH; RACHMAWATI RUSYDI
Akuatik: Jurnal Sumberdaya Perairan Vol 4 No 2 (2010): AKUATIK : Jurnal Sumberdaya Perairan
Publisher : Department of Aquatic Resources Management, Faculty of Agriculture, Fisheries, and Biology, University of Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (232.922 KB)

Abstract

Yellow velvetleaf (Limnocharis flava) is aquatic plant and known as vegetable and source of bioactive compound but it has aerenchyma system which affects to its proximate. The research purpose was to determine microscopic characteristics of yellow velvetleaf tissues such as leaf, stem, and root tissue. The proximate and bioactive compound from fresh and steam materials were also evaluated. The methods of the research consisted of plant dimension measurement, making of tissue slide by paraffin method in Johansen-TBA series, phytochemical analysis, proximate and carotenoid total analysis. The results showed that leaf tissue was composed by epidermis unilayer containing stoma, a palisades parenchyma layer, spongy parenchyma layer with some aerenchyma system, and vascular bundle. Stem tissue consisted of epidermis unilayer, cortex containing chlorophyll, starch, and some aerenchyma system, and vascular bundle was amphicribral type. Root tissue was composed by rhizodermis, cortex with aerenchyma system, endodermis multilayer, and vascular bundle. Fresh yellow velvetleaf contained 91,76% of moisture, 12,40% of ash, 7,95% of fat, 22,96% of protein, 11,93% of crude fibre, and 219,01 g/g of carotenoid total in its leaf. Its stem contained 95,33% of moisture, 16,38% of ash, 5,62% of fat, 13,23% of protein, 16,12% of crude fibre, and 92,99 g/g of carotenoid total. Steaming decreased crude fibre content, but increased ash, fat, and protein content. Steaming also increased leaf carotenoid total, but decreased stem carotenoid total. Leaf extract contained flavonoid, phenol, reducing sugar, and amino acid. Stem extract was composed by flavonoid, reducing sugar, amino acid. Flavonoid and reducing sugar were major bioactive compounds in this plant.
KOMBINASI KOTORAN BURUNG PUYUH, SUSU BUBUK AFKIR, DAN TAPIOKA TERFERMENTASI PADA MEDIA KULTIVASI CACING SUTERA (Tubifex sp) Rachmawati Rusydi; Nurfazilah; Salamah; Erniati; Munawwar Khalil
Journal of Fish Nutrition Vol. 1 No. 1 (2021): journal of fish nutrition
Publisher : Journal of Fish Nutrition

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (253.63 KB) | DOI: 10.29303/jfn.v1i1.158

Abstract

Cacing sutera (Tubifex sp.) merupakan pakan alami yang banyak digunakan pada kegiatan pembenihan ikan. Cacing sutera ini mampu memberikan nutrisi yang baik bagi pertumbuhan larva ikan dengan ukuran yang sesuai bukaan mulut larva dan bersifat atraktif. Namun, ketersediaan populasi cacing sutera sangatlah terbatas di alam dan membutuhkan pasokan cacing sutera dari kegiatan kultivasi cacing sutera. Penelitian ini bertujuan untuk mengevaluasi kombinasi kotoran burung puyuh (K), susu bubuk afkir (S) dan tapioka (T) terfermentasi pada media kultivasi cacing sutera. Metode penelitian ini adalah eksperimental laboratorium dengan Rancangan Acak Lengkap Non-Faktorial dengan 4 (empat) taraf perlakuan dan 3 (tiga) kali ulangan. Taraf perlakuan penelitian terdiri atas A (K = 100%), B (K=50%, S=35%, T=15%), C (K=50%, S=25%, T=25%), D (K=50%, S=15%, T=35%). Tahapan penelitian terdiri atas persiapan bibit cacing sutera, aktivasi EM4 dalam fermentasi kombinasi kotoran burung puyuh, susu bubuk afkir, dan tapioka, persiapan media kultivasi cacing sutera, penebaran benih cacing sutera dan pemeliharaan. Hasil penelitian menunjukkan bahwa pertumbuhan populasi, biomassa dan kandungan nutrisi serta rasio C/N terbaik diperoleh pada perlakuan C dengan puncak populasi 406 individu/wadah, biomassa 33,21 g/wadah, nutrisi protein dan lemak sebesar 51,7 ± 0,42% dan 14,56 ± 0,028%, dan rasio C/N 12,5:1. Rekomendasi hasil penelitian ini adalah kombinasi kotoran burung puyuh 50%, susu bubuk afkir 25%, dan tapioka terfermentasi 25% memberikan nutrisi yang paling baik untuk kultivasi cacing sutera.
Model of nitrogen-phosphorus ratio and phytoplankton relationship in lake Laut Tawar, Indonesia Saiful Adhar; Munawwar Khalil; Erlangga Erlangga; Muliani Muliani; Rachmawati Rusydi; Mainisa Mainisa; Imanullah Imanullah; Yudho Andika
Depik Vol 12, No 3 (2023): DECEMBER 2023
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.12.3.33935

Abstract

Phytoplankton blooms in the lake cause ecological, economic, health, energy, and aesthetic losses. It reduces water quality and biota diversity, creates toxins in the waters, and changes the structures and functions of the ecosystem. The essential nutrients for the growth of phytoplankton are nitrogen and phosphorus. Controlling phytoplankton growth can be managed by controlling the limiting nutrient input. This study aims to identify the limiting nutrient, analyze variations in TN:TP ratio spatially and temporally, and model TN:TP ratio and chlorophyll-a relationship. This study used secondary data from previous studies, namely TN, TP, and chlorophyll-a observed monthly in seven stations purposively during a year. Rainfall data was also obtained from the previous study. Limiting nutrients were determined by Redfield theory, and data were analyzed by Spearman correlation, One-way ANOVA, Kruskal-Wallis, and regression analysis. The results showed phosphorus was a limiting nutrient for phytoplankton growth in Lake Laut Tawar.  TN:TP ratio and chlorophyll-a did not vary spatially, indicating the lake surface waters were evenly mixed. The parameters varied temporally, expressing the influence of hydroclimatological factors, especially rainfall. Rainfall increases nutrient input to the lake, but only rain below 200 mm/month causes an increase in the concentration of nutrients in the lake. The rainfall above 200 mm/month increases lake water volume significantly, thereby reducing nutrient concentrations. TN:TP ratio and chlorophyll-a related negatively and formed a non-linear relationship with an empirical model Chlorophyll-a = 2770.285 (TN/TP)-1.871. Eutrophication of Lake Laut Tawar should be anticipated by controlling the anthropogenic phosphorus input.Keywords:AnthropogenicChlorophyll-aEutrophication,Limiting nutrientRainfall
Co-Authors Agoes M. Jacoeb Asadatun Abdullah Erlangga Erlangga Erlangga Erlangga Erniati Eva Ayuzar Imanullah Imanullah Mainisa Mainisa Muhammad Hatta Muliani Muliani Munawwar Khalil, Munawwar Nurfazilah Saiful Adhar Salamah Yudho Andika