Nutrient Loading and Farm Characteristics of Giant Gourami Fish Aquaculture Systems in Lake Maninjau
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F1000Research 2021, 10:378 Last updated: 27 SEP 2021 RESEARCH ARTICLE Nutrient loading and farm characteristics of giant gourami fish aquaculture systems in Lake Maninjau, Indonesia: basic knowledge of production performance [version 2; peer review: 2 approved] Hafrijal Syandri 1, Azrita Azrita 2, Eni Sumiarsih3, Elfiondri undefined 4 1Department of Aquaculture, Faculty of Fisheries and Marine Science, Universitas Bung Hatta, Padang, West Sumatera, 25133, Indonesia 2Department of Biology Education, Faculty of Education, Universitas Bung Hatta, Padang, West Sumatera, 25133, Indonesia 3Department of Aquaculture, Faculty of Fisheries and Marine Science, Universitas Riau, Pekanbaru, 28293, Indonesia 4Faculty of Humanities, Universitas Bung Hatta, Padang, West Sumatera, 25133, Indonesia v2 First published: 12 May 2021, 10:378 Open Peer Review https://doi.org/10.12688/f1000research.52613.1 Latest published: 22 Sep 2021, 10:378 https://doi.org/10.12688/f1000research.52613.2 Reviewer Status Invited Reviewers Abstract Background 1 2 Aquaculture systems for giant gourami, Osphronemus goramy Lacepède (1801), have significantly improved fish production yields version 2 and food security in Indonesia. However, these systems also cause (revision) report report serious problems in terms of eutrophication in waterbodies. This 22 Sep 2021 study analysed the nutrient loading and farm characteristics of giant gourami in floating cages in Lake Maninjau. version 1 Method 12 May 2021 report report A total of 20 floating cages were used to record these nutrients in feed supply, female and male juvenile fish, dead fish and harvested fish to estimate nutrient loading. Data on the harvested fish, production 1. Zahidah Hasan , Padjadjaran University, cycle, stock number and cage capacity were used to estimate the Jatinangor, Indonesia stocking density, feeding rate, feed efficiency, and net fish yield, and the relationship between feed supply and nutrient loading and farm 2. Christopher Mulanda Aura , Kenya characteristics was analysed by least squares regression methods. Marine and Fisheries Research Institute, Results A total of 20 floating cages released nutrients into waterbodies at an Kisumu, Kenya average rate of 236.27±60.44 kg/cycle for C, 84.52±20.86 kg/cycle for Any reports and responses or comments on the N and 8.70±3.63 kg/cycle for P. On average, fish production for each floating cage (±SD) was 1226±282 kg wet weight/cycle, and the net article can be found at the end of the article. fish yield was 12.63±2.82 kg/m3/cycle. Survival rates ranged from 86.33 to 95.27%/cycle. The production cycles varied from 160 to 175 days with feed conversion ratios between 1.60 and 1.75, feed conversion efficiencies were between 0.58 and 0.63. The production parameters that had strong relationships with the net fish yield were feed supply (r2=0.960), stocking rates (r2=0.924) and feeding rates (r2 Page 1 of 16 F1000Research 2021, 10:378 Last updated: 27 SEP 2021 =0.961). In contrast, the length of the production cycle was not strongly related to the net fish yield (r2=0.187). Conclusion Nutrient loading from the supplied feed was greater than that from the harvested fish, juvenile fish and dead fish. Increasing the net fish yield in floating cages was better predicted by the stocking densities and feeding levels than by the other factors. Keywords Lake Maninjau, giant gourami culture, floating cage aquaculture, nutrient loading, farm characteristics. Corresponding author: Hafrijal Syandri ([email protected]) Author roles: Syandri H: Conceptualization, Data Curation, Formal Analysis, Methodology, Validation, Writing – Original Draft Preparation, Writing – Review & Editing; Azrita A: Data Curation, Formal Analysis, Project Administration; Sumiarsih E: Data Curation, Methodology, Writing – Original Draft Preparation; undefined E: Resources, Writing – Review & Editing Competing interests: No competing interests were disclosed. Grant information: This study was funded by a competitive grant for productive and innovative research (Policy/Governance) from the Indonesia Education Fund Management Institution (LPDP), Ministry of Finance, Republic of Indonesia with contract number PRJ- 99/LPDP/2019. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Copyright: © 2021 Syandri H et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The author(s) is/are employees of the US Government and therefore domestic copyright protection in USA does not apply to this work. The work may be protected under the copyright laws of other jurisdictions when used in those jurisdictions. How to cite this article: Syandri H, Azrita A, Sumiarsih E and undefined E. Nutrient loading and farm characteristics of giant gourami fish aquaculture systems in Lake Maninjau, Indonesia: basic knowledge of production performance [version 2; peer review: 2 approved] F1000Research 2021, 10:378 https://doi.org/10.12688/f1000research.52613.2 First published: 12 May 2021, 10:378 https://doi.org/10.12688/f1000research.52613.1 Page 2 of 16 F1000Research 2021, 10:378 Last updated: 27 SEP 2021 such as stocking density, total stock weight, feed conversion REVISED Amendments from Version 1 ratio, production cycle, harvest size, feeding level and spe- cific growth rate. To address these issues, the present study We have revised article No. 52613 as follows: was conducted to evaluate the C, N and P nutrient loads of Reviewer 1: Prof. Zahidah Hasan, Padjadjaran University, giant gourami fish in floating cages and the operational char- Jatinangor, Indonesia acteristics to determine the relationship between production Part methods: and cultivation efficiency to provide basic knowledge about 1. We have added the length of time for installing waste traps production performance for the future. under floating net cages (highlight in Green) 2. We have added that aquaculture waste includes uneaten feed, Methods metabolic waste, and feces (highlight in Green). Ethical considerations Reviewer 2: Prof. Christopher Mulanda Aura, Kenya Marine, and In the present study, no permits from the Government of the Fisheries Research Institute, Kisumu, Kenya Republic of Indonesia were needed to record data on feed Part Discussion supply, initial weight, stocking density, fish production, fish mortality and production cycle of giant gourami in 20 floating 1. We have added water quality parameters in part discussion and compare them to other lakes (highlight in Green). cages in Lake Maninjau from 2019 to 2020. The study included collecting sediment and fish and killing as many as three giant 2. We have added comments at the end of the conclusion, and gourami in each floating cage to analyse the chemical composi- conclusions drawn are adequately supported by the results (highlight in Green). tion of carbon, nitrogen and phosphorus from the carcasses. This research was recommended by the Research and Community Any further responses from the reviewers can be found at the end of the article Service Universitas Bung Hatta with sponsorship from the Indonesian Education Management Institution, Ministry of Finance Republic of Indonesia, through a competitive grant called Productive Innovative Research 2019 with contract Introduction number PRJ-99/LPDP/2019. Ethical approval was granted by Fish are a source of protein, lipids, carbohydrates, vitamins and the Ethics Commission for Research and Community service at essential minerals1–3. Therefore, fisheries production is very Universitas Bung Hatta (098/LPPM/Hatta/X-2019). important to increasing food security3,4 through capture fisher- ies and aquaculture sectors5. To increase the global production Study area of aquaculture, freshwater can be provided in a variety of The research was conducted in Lake Maninjau, located in the aquaculture systems, such as freshwater ponds, tanks and Agam District, West Sumatera Province, Indonesia, at an alti- floating cages6–9. tude of 463 m above sea level with a surface area of 97.37 km2, a water volume of 10.4 km3, a water retention time of 24.5 years, Cage aquaculture is expanding in tropical lakes and has been and a catchment area of 13.26 km2. Since 1973, lake water ongoing for a long time9–11. Lake Maninjau in Indonesia has has been used for electric power generation with a capacity used cage aquaculture since 1992 (Nazarudin-Sepakat Aqua- of 64 MW, and starting in 1992, the lake has also been used culture’s farm manager, pers. comm.). Some authors have floating-cage fish farming activities. reported that the dominant species being cultured in tropical lakes is tilapia, and commercial feed pellets are used9,11–15. In Study design the past five years, fish farmers in Lake Maninjau have also A total of 200 floating cages using for giant gourami aquac- conducted giant gourami fish farming activities in floating ulture by fish farmers in Lake Maninjau (Nazaruddin-Sepakat cages with commercial feed pellets because it is an economi- Aquaculture farm manager, personal communication). A total cally important species for food security in Indonesia, and most of 20 floating cages for giant gourami culture were used as sam- of the giant gourami that have been consumed for decades ples. The sample was determined by simple random sampling have been produced by aquaculture in freshwater ponds7,16,17. using