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All Journal Journal of Aquaculture and Fish Health
Djamil, Hasim
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Agriculture, Biological Sciences & Forestry

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Nutrient Concentration, Water Brightness, Chlorophyll-a, and Phytoplankton Abundance as Indicators for Determining the Trophic Status of Lake Toba, North Sumatera - Indonesia Saragih, Friska Setiawani; Djamil, Hasim; Juanda, Juanda; Mubarak, Ahmad Shofy; Hasan, Veryl; Sihombing, Agusmanto; Satyantini, Woro Hastuti
Journal of Aquaculture and Fish Health Vol. 13 No. 3 (2024): JAFH Vol. 13 No. 3 September 2024
Publisher : Department of Aquaculture

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jafh.v13i3.57981

Abstract

The purpose of this study was to investigate the water quality and phytoplankton abundance in Lake Toba to determine its trophic status. This research was conducted from January to March 2024 at four stations in Lake Toba. Water samples were taken using a UWITEC water sampler and a plankton net and brought to the laboratory for analysis. The study measured physical and chemical water quality and phytoplankton abundance. The results showed a brightness ranging between 5.8 and 6.3 meters, chlorophyll-a content <10 µg/L, total nitrogen <750 µg/L, and phosphorus ranging from 20 µg/L to 30 µg/L. Based on these parameters, the nutrient quality of Lake Toba was classified as mesotrophic. Phytoplankton abundance ranged from 22,514 to 33,475 individuals/L, with 33 genera identified across nine classes: Bacillariophyceae, Chlorophyceae, Cyanophyceae, Coscinodiscophyceae, Dinophyceae, Euglenida, Fragilariophyceae, Mediophyceae, and Zygnemophyceae. The diversity index (H') was 2.631 - 2.723, the uniformity index (E) was 0.828 - 0.872, and the percentage of blue-green algae was 14.75 - 20.85. Zygnemophyceae was the most dominant phytoplankton class, with Staurastrum sp. being the most prevalent species. In conclusion, Lake Toba's waters are categorized as mesotrophic based on the chemical parameters and as eutrophic based on phytoplankton abundance, indicating potential nutrient enrichment issues that warrant further investigation.
Optimization of US Soybean Meal for Growth Performance of Tilapia (Oreochromis niloticus) Compared to Commercial Feed on Lake Toba, North Sumatera, Indonesia Juanda; djamil, Hasim; Saragih, Friska Setiawani; Susanti, Apryani
Journal of Aquaculture and Fish Health Vol. 14 No. 1 (2025): JAFH Vol. 14 No. 1 February 2025
Publisher : Department of Aquaculture

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jafh.v14i1.61274

Abstract

Feed is the most important factor in supporting the growth of tilapia fish production. Soybean meal is recognized as a cost-effective alternative protein source to replace costly fish meal in aquaculture. This study aimed to evaluate and compare the growth performance of tilapia (Oreochromis niloticus) fed a diet optimized with US soybean meal compared to an available commercial tilapia diet in fish farming in Lake Toba, North Sumatra. Two experimental diets were used including commercial feed as a control and feed with optimized US Soybean meal with three replications. The experimental diets were given two times a day. After 240 days of feeding, data from the study were analyzed using independent samples T-test on the Statistical Product and Service Solutions (SPSS) software version 25.0. The Survival Rate (SR), Average Body Weight (ABW), Feed Conversion Ratio (FCR), and the harvested biomass of tilapia on the feed with US Soy were 64.2%, 1262.2 g, 1.76, and 244.144 kg, respectively.  There was no significant effect (P > 0.05) on the SR (Survival rate), Feed Conversion Ratio (FCR), ADG (Average Daily Growth), and final ABW (Average Body Weight) in both the experimental diets. However, the harvested biomass of tilapia, fed with feed-optimized US soybean meal was better than control. An important finding of this research is the potential of optimizing US soybean meal in aquafeed to increase the growth of tilapia farming.
Co-Authors A. Shofy Mubarak Juanda Juanda Juanda Saragih, Friska Setiawani Sihombing, Agusmanto Susanti, Apryani Veryl Hasan Woro Hastuti Setyantini