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All Journal Jurnal Ilmiah Samudra Akuatika Jurnal Pengabdian Masyarakat: Darma Bakti Teuku Umar Arwana: Jurnal Ilmiah Program Studi Perairan Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan Buletin Pengabdian Depik Jurnal Ilmu-Ilmu Perairan, Pesisir, dan Perikanan ABDIMU: Jurnal Pengabdian Muhammadiyah
Rachmawati Rusydi, Rachmawati
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Religion Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Engineering Languange, Linguistic, Communication & Media Public Health Social Sciences Other

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Biological status of blue swimming crab population (Portunus pelagicus) in Estuarine Water at Langsa City Sari, Nurdian Novita; Febri, Suri Purnama; Putriningtias, Andika; Haser, Teuku Fadlon; Rusydi, Rachmawati; Hanisah, Hanisah; Nazlia, Suraiya; Aprita, Ika Rezvani
Depik Vol 13, No 2 (2024): AUGUST 2024
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.13.2.33273

Abstract

Many factors encourage the exploitation of the blue swimming crab in the estuarine water of Langsa City. Therefore, maintaining crab populations in nature through fishing regulation becomes an important effort. Evaluation of the biological aspects of the blue swimming crab population the estuarine waters of Langsa City has the main role in the arrangement of regulation. This study aimed to determine the biology of the blue swimming crab population in the estuarine waters of Langsa City. This research was carried out in August 2022 in the estuarine waters of Langsa City. The method used was the survey method. The crab samples were taken randomly from the crab fishermen as much as 10% of the catch. Sampling once a week at 2 different location points for 1 month. The results showed that the relationship between carapace width and weight of male and female blue swimming crabs (Portunus pelagicus) had a negative allometric growth pattern because of the value of b 3, namely 1.22 and 1.21. The sex ratio of blue swimming crabs was not 1:1 or unbalanced. Gonadal maturity of male crabs was highest in level I, meanwhile the female could achieve the gonadal maturity in level V. During the research, the water quality of estuarine waters was in optimum condition.Keywords:Blue swimming crabBiological aspectEstuarinePopulation
Model of nitrogen-phosphorus ratio and phytoplankton relationship in lake Laut Tawar, Indonesia Adhar, Saiful; Khalil, Munawwar; Erlangga, Erlangga; Muliani, Muliani; Rusydi, Rachmawati; Mainisa, Mainisa; Imanullah, Imanullah; Andika, Yudho
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
Utilization of Fermented Sawdust and Cocopeat as Substrate Media for Tubifex sp. Culture Febrian , Muhammad Rizki; Rusydi, Rachmawati; Salamah, Salamah; Muliani, Muliani; Ayuzar, Eva; Mahdaliana, Mahdaliana
Jurnal Ilmiah Samudra Akuatika Vol 9 No 1 (2025): Jurnal Ilmiah Samudra Akuatika
Publisher : Fakultas Pertanian Universitas Samudra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33059/jisa.v9i1.12899

Abstract

Tubifex worms are freshwater oligochaetes characterized by their bright red color and high nutritional content, consisting of 57% protein, 13.3% fat, 2.04% crude fiber, and 3.6% ash. Their natural populations have declined due to water pollution from waste, which reduces water quality, thus necessitating cultivation efforts. This study aimed to evaluate the effect of fermented sawdust and cocopeat as culture substrates on the biomass, population, and growth rate of Tubifex worms. The experiment was conducted using a Completely Randomized Design (CRD) with a non-factorial model consisting of four treatments and three replications: A (control: 80% mud + 20% chicken manure), B (80% fermented sawdust + 20% chicken manure), C (80% fermented cocopeat + 20% chicken manure), and D (40% fermented sawdust + 40% fermented cocopeat + 20% chicken manure). Analysis of variance (ANOVA) showed that different substrate compositions had a significant effect on biomass, population peak, and growth rate. The best performance was observed in treatment B, which resulted in the highest biomass (13.32 g/container), the highest population peak (120,111 individuals/container on day 40), and the highest growth rate (3.09%). These results indicate that fermented sawdust supplemented with chicken manure is the most effective substrate for enhancing the growth and population of Tubifex worms.
Co-Authors Alfaini, Momika Andika, Yudho Antoni Antoni Erlangga Erlangga Eva Ayuzar, Eva Febri, Suri Purnama Febrian , Muhammad Rizki Fuadi, Wahyu Hanisah, Hanisah Haser, Teuku Fadlon Herlina Putri Endah Sari Ika Rezvani Aprita Imanullah, Imanullah Khairawati, K Mahdaliana, Mahdaliana Mainisa, Mainisa Muhammad Hatta Muliani Muliani, Muliani Munawwar Khalil, Munawwar Natasya, Siti Nazlia, Suraiya Prama Hartami Putriningtias, Andika Rahmaniar, R Ranim, Yenfi Riza Riani Riani, Riani Saiful Adhar salamah salamah Sari, Nurdian Novita Siti Komariyah Wahyuni, Riri Yusrizal Akmal