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All Journal Tomini Journal of Aquatic Science Indonesian Journal of Limnology
Putu Cinthia Delis
University of Lampung
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Environmental Science

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Trophic states assessed from abundance of phythoplankton and chlorophyl-a content in Raman Resevoir Metro, Lampung Province Aulia Insani; Herman Yulianto; Putu Cinthia Delis
Tomini Journal of Aquatic Science VOLUME 2 ISSUE 1, MAY 2021
Publisher : Gorontalo State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (494.656 KB) | DOI: 10.37905/tjas.v2i1.10160

Abstract

Raman reservoir is located at north of Metro City, Lampung. The water resources of the reservoir comes from Way Bunut and Way Raman rivers. The Way Bunut and Way Raman rivers flow into the Raman reservoir which is used for a variety of human activities, including fish farming with the floating net cage system, tourism, and agriculture. These activities produce organic and inorganic materials into the waters so that it may cause changes in water quality and trophic states levels, therefore research is carried out on the trophic states based on the abundance of phytoplankton and chlorophyll-a content in the waters of the Raman Reservoir. The purpose of this study was to assess the trophic states of the Raman Reservoir based on the abundance of phytoplankton, chlorophyll-a concentration, and Nygaard Index. This research was conducted in January-March 2020. The data was collected using purposive sampling method. The parameters used in this study were abundance of phytoplankton, chlorophyll-a, primary productivity, brightness, depth, temperature, DO, pH. Trophic states results based on the concentration of chlorophyll-a in the morning range from 0.0007 - 0.0274 mg/L while at noon it ranges from 0.0083-0.0769 mg/L. The results of these measurements can be categorized as chlorophyll-a content in Raman Resevoir was still in the category oligotrophic. The results of trophic states based on the Nygaard index it shows the category of eutrophic.
Phytoplankton Composition and Water Fertility Status of Lake Ranau, West Lampung Regency, Lampung Province Eko Efendi; Henni Wijayanti Maharani; Putu Cinthia Delis; Rara Diantari
Indonesian Journal of Limnology Vol. 4 No. 2 (2023): Indonesian Journal of Limnology
Publisher : Indonesian Society of Limnology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51264/inajl.v4i2.42

Abstract

Lake Ranau is the second largest lake on Sumatra Island. This lake has a high potency for fisheries. Fisheries activities carried out in Lake Ranau are fishing and aquaculture activities with nile tilapia (Oreochromis niloticus) as the main commodity. Intensive fish farming activities will cause impacts in the form of waste caused by feces and wasted feed. This waste will increase the nutrient loads that enter the waters, triggering the nutrient enriching phenomenon known as eutrophication. Eutrophication is a process of water enrichment by nutrients, mainly nitrogen and phosphorus, which can change the community structure of phytoplankton in the waters and increase their growth. This study aims to analyze the composition of phytoplankton in the waters of Lake Ranau and to estimate the status of water fertility. Data collected was water quality data and phytoplankton data. Status of water fertility was analyzed using the saprobic index. The results show that the community structure of phytoplankton exhibits values as follows: the diversity index ranging from 1.54–3.08, the uniformity index ranging from 0.46–0.90, and dominance index ranging from 0.06–0.41. The abundance of phytoplankton is dominated by the species Nitzhia sp., Synedra, Diatoma, and Tabellaria (all are from the Bacillariophyceae class). The saprobic index obtained ranges from 0.74–1.26, thus categorized as the ?/?-mesosaprobic phase, meaning the waters of Lake Ranau are lightly polluted by a little load of organic and inorganic matters.
Co-Authors Aulia Insani Eko Efendi Henni Wijayanti Maharani Herman Yulianto Rara Diantari