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All Journal Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan Proceedings of Malikussaleh International Conference on Multidisciplinary Studies (MICoMS)
Rachmawati Rusydi
Malikussaleh University
Earth & Planetary Sciences Education Engineering Environmental Science Physics

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Comparison of Growth Performance of Nannochloropsis oculata Biofilm at Different Layers of Substrate Plastic Rachmawati Rusydi; Muliani Muliani; Angga Dian Pratama Matondang
Proceedings of Malikussaleh International Conference on Multidisciplinary Studies (MICoMS) Vol. 4 (2024): Proceedings of Malikussaleh International Conference on Multidisciplinary Studies (MI
Publisher : LPPM Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/micoms.v4i.955

Abstract

Biofilm based microalga is a structured community of microalgae attaching to substrate with a self-produced matrix of extracellular polymeric substances (EPS). One of microalgae that is potential to be improved as biofilm is Nannochloropsis oculata. Biofilm of Nannochloropsis oculata has some beneficial roles such as bioremediator of polluted waters. This study was aimed to evaluate the growth performance of Nannochloropsis oculata at different layers of substrate plastic as biofilm substrate. The experimental design used was Completely Randomized Design (CRD) with four level treatments and three replications. Several treatments tested were A: Control (without layer), B: 1 Layer of substrate, C: 2 Layers of substrate, D: 3 Layers of substrate. Several procedures were conducted in this study which were preparation of KW21 medium, cultivation of biofilm at different treatments in KW21 medium, and growth measurement. The results of this study showed that different number of substrate layers could affect the specific growth rate of free cells of Nannochloropsis oculata. The highest growth rate was found in treatment B (1 substrate layer) and the lowest one was in treatment D with their values 0.064 µ/day and 0,037 µ/day. The peak population of Nannochloropsis oculata was obtained at day 14 until 15.
Biological status of blue swimming crab population (Portunus pelagicus) in Estuarine Water at Langsa City Nurdian Novita Sari; Suri Purnama Febri; Andika Putriningtias; Teuku Fadlon Haser; Rachmawati Rusydi; Hanisah Hanisah; Suraiya Nazlia; Ika Rezvani Aprita
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
Co-Authors Andika Putriningtias Angga Dian Pratama Matondang Hanisah Hanisah Ika Rezvani Aprita Muliani Muliani Nurdian Novita Sari Suraiya Nazlia Suri Purnama Febri Teuku Fadlon Haser