scholarly journals Mitigasi Beban Fosfor dari Kegiatan Budidaya dengan Penebaran Ikan Bandeng (Chanos chanos) Di Waduk Cirata, Jawa Barat

2018 ◽  
Vol 19 (2) ◽  
pp. 259
Author(s):  
Andri Warsa ◽  
Joni Haryadi ◽  
Lismining Pujiyani Astuti
Keyword(s):  
Water Quality ◽  
Primary Productivity ◽  
Carrying Capacity ◽  
Aquatic Environment ◽  
Aquatic Ecology ◽  
Planktivorous Fish ◽  
Phosphorus Loading ◽  
Fish Biomass ◽  
Chanos Chanos ◽  
Net Cages

ABSTRACTThe phosphorus loading from aquaculture activity as a product of floating net cages (KJA) in Cirata Reservoir have exceeded the carrying capacity of the aquatic ecology. This results in a decrease in water quality which is characterized by uncontrolled phytoplankton growth. The stocking of fish is one of the ways used in the improvement of the aquatic environment resulting eutrophication. Phosphorus which is wasted from cultivation activity will be utilized by phytoplankton for its growth. The phytoplankton can be utilized by planktivorous fish as its natural feed. One type of fish that can be used for stocking is a planktivora fish as milkfish (Chanos chanos). The purpose of this study was to estimate the load of phosphorus and calculate the number of milkfish seeds which are planktivorous fish that can be stocked with the aim of reducing phosphorus waste from aquaculture activities in Cirata Reservoir, West Java. The result showed that P load from cultivation activity at Cirata Reservoir was 1,206 tons/year. The concentration of chlorophyll-a and the primary productivity produced by the P load from the cultivation activities were 28.6 mg/m3 and 364.6 gC/m2/year respectively. The number of milkfish seeds that can be stocked as an effort to utilize the load of phosphorus as much as 1.8 million/year. The P load can be reduced based on estimation of harvested fish biomass and phosphor requirement for milkfish of 11.52 ton/year.Keywords: Cirata Reservoir, phosphorus loading, stocking, milkfishABSTRAKBeban masukkan fosfor (P) dari kegiatan budidaya ikan dalam keramba jaring (KJA) dari pakan yang terbuang dan sisa metabolisme ikan di Waduk Cirata telah melebihi daya dukung ekologi perairan. Hal ini berdampak pada penurunan kualitas perairan yang ditandai oleh pertumbuhan fitoplankton yang tidak terkendali. Penebaran ikan merupakan salah satu cara yang digunakan dalam perbaikan lingkungan perairan akibat dari eutrofikasi. Fosfor di perairan dimanfaatkan oleh fitoplankton untuk pertumbuhannya. Fitoplankton tersebut dapat dimanfaatkan oleh ikan planktivora sebagai pakan alaminya.Salah satu jenis ikan yang dapat ditebar (stocking) adalah ikan planktivora yaitu ikan bandeng (Chanos chanos). Tujuan penelitian ini adalah untuk mengestimasi beban masukkan fosfor serta menghitung jumlah benih ikan bandeng yang dapat ditebar dengan tujuan pengurangan limbah fosfor dari kegiatan budidaya di Waduk Cirata, Jawa Barat. Hasil penelitian menunjukkan beban P yang berasal dari kegiatan budidaya di Waduk Cirata sebesar 1.206 ton/tahun. Konsentrasi klorofil-a dan produktivitas primer yang dihasilkan oleh beban P dari kegiatan budidaya masing-masing sebesar 28,6 mg/m3 dan 364,6 gC/m2/tahun. Jumlah benih ikan bandeng yang dapat ditebar sebagai upaya pemanfaatan beban masukkan fosfor sebanyak 1,8 juta ekor/tahun. Beban P yang mampu dikurangi berdasarkan estimasi biomassa ikan yang dipanen dan kebutuhan fosfor untuk ikan bandeng sebesar ton 11,52 ton/tahun.Kata kunci: Waduk Cirata, beban fosfor, penebaran, bandeng

scholarly journals The Impact of Floating Net Cage (FNC) on Primary Productivity in Cirata Reservoir Waters

2021 ◽  
pp. 35-42
Author(s):  
Sayyid Arrasyid ◽  
Zahidah Hasan ◽  
Izza Mahdiana Apriliani ◽  
Heti Herawati
Keyword(s):  
Water Quality ◽  
Primary Productivity ◽  
Local Community ◽  
Oxygen Demand ◽  
Quality Standard ◽  
Water Volume ◽  
Physical Parameters ◽  
Reservoir Water ◽  
Net Cages ◽  
The Impact

Cirata Reservoir is one of the three cascade reservoirs fed by the Citarum Watershed with an area of ​​62 km2 (6.200 ha) and has a water volume of 1.900 million m3. The great potential of the waters in the Cirata Reservoir is utilized by the local community as a source of livelihood, namely by conducting aquaculture activities using floating net cages (FNC) in excess. FNC is thought to be a source of waste that reduces reservoir water quality. This research aims to determine the impact of FNC cultivation on primary productivity with different FNC densities at each station. The research was conducted in Cianjur Regency by taking on three stations, namely in the areas of Jangari, Maleber, and Patok Beusi on November 6 - December 8, 2019. The method used in the research was purposive sampling then analyzed in detail and quantitatively. The results show that reservoir waters have an average of physical parameters, namely temperature 32.2-32.6oC, transparency 0.59-0.68 meters, pH 7.1-7.3, carbon dioxide 15.4-16.1 mg / l, Dissolved Oxygen 6.9-7.3 mg / l, Biochemical Oxygen Demand 6.1-7.8 mg / l, nitrate 0.208-0.222 mg / l, ammonia 0.002833-0.003056 mg / l, phosphate 0,165-0,167 mg / l and primary productivity 240,36-277,90 mgC/m3/hour. This shows that the water indicator is still classified as good because it does not exceed the water quality standard.

Performance Of Milkfish (Chanos chanos) Cultured by Different Stocking Density in Floating Net Cages Lake Batur, Trunyan Village, Bali

2021 ◽  
Vol 5 (1) ◽  
pp. 29
Author(s):  
Gede Dwi Sukmawantara ◽  
I Wayan Arthana ◽  
Gde Angga Raka Kartika
Keyword(s):  
Water Quality ◽  
Growth Rate ◽  
Survival Rate ◽  
Stocking Density ◽  
Fish Length ◽  
Chanos Chanos ◽  
Absolute Length ◽  
The Difference ◽  
Net Cages ◽  
Fish Survival

Lake Batur is the largest lake in the island of Bali. Lake Batur is widely used by the community in the aquaculture sector, namely floating net cage cultivation. The research aims to determine the influence of different stocking density on the growth rate and survival rate of the milkfish (Chanos chanos) in the 4 x 1 meters floating net cages in Lake Batur, Trunyan village. Data collection was done every two weeks during two months observation, from January 2020 – March 2020. The research used a complete random design consisting of three treatments and three replications of each treatment, which the treatment A of 15 fish/0.25m3, treatment B of 20 fish/0.25m3, and the treatment C of 25 fish/0.25m3. Measurements of fish length, fish weight, and water quality were done in situ. The results showed that the difference in stocking density had no effect on the absolute length, but those difference had an effect on the specific growth rate (SGR) and the survival rate of the fish. Treatment B resulted a maximum value of the growth rate, with an absolute length value of 0.69 ± 0.115cm/2 month and SGR 1.02 ± 0.095%/day. The fish survival rate at treatment A resulted in the highest value of 89 ± 3.46%/2 month. The value of water quality during the study were temperature of 25.9 ± 0.8oC, DO of 8.3 ± 0,1 mg/L, pH of 9.4 ± 0.2, and TDS of 995.5 ± 70.8 ppm.

scholarly journals Planktivores and Plankton Dynamics: Effects of Fish Biomass and Planktivore Type

1992 ◽  
Vol 49 (7) ◽  
pp. 1466-1473 ◽  
Author(s):  
Xavier Lazzaro ◽  
Ray W. Drenner ◽  
Roy A. Stein ◽  
J. Durward Smith
Keyword(s):  
Water Quality ◽  
Green Algae ◽  
Primary Productivity ◽  
Trophic Cascade ◽  
Gizzard Shad ◽  
Particulate Phosphorus ◽  
Fish Biomass ◽  
Dorosoma Cepedianum ◽  
Pennate Diatoms ◽  
Plankton Communities

We quantified the effects of planktivore biomass and planktivore type in an experimental mesocosm study of factorial design in which five levels of fish biomass (0–75 g/m3) were cross-classified with two plantivore types: filter-feeding gizzard shad (Dorosoma cepedianum) and visual-feeding bluegill (Lepomis macrochims). As fish biomass increased, cladocerans, cyclopoids, particulate phosphorus (PP) > 200 μm, and chironomids declined; conversely, rotifers, primary productivity, chlorophyll a, turbidity, unicellular flagellates, colonial and unicellular green algae, pennate diatoms, total phosphorus, and 20–200 and 12–20 μm PP were enhanced. In the presence of gizzard shad, as compared with bluegill, cyclopoids, turbidity, unicellular green algae, pennate diatoms, > 200 μm PP, and chironomid tubes were higher whereas colonial green algae and < 0.2 μm PP were lower. Fish biomass operated independently of planktivore type for most variables, except copepods, colonial green algae, turbidity, and 20–200 μm PP. Although gizzard shad and bluegill have different trophic cascade pathways, fish biomass was more important than planktivore type as a regulator of plankton communities and water quality.

Long-Term (15 Years) Results of NPS Controls in an Agricultural Watershed upon a Receiving Lake's Water Quality

1993 ◽  
Vol 28 (3-5) ◽  
pp. 441-449 ◽  
Author(s):  
Paul J. Garrison ◽  
Timothy R. Asplund
Keyword(s):  
Water Quality ◽  
Structural Changes ◽  
Soil Phosphorus ◽  
Water Clarity ◽  
Management Control ◽  
Agricultural Watershed ◽  
Control Measures ◽  
Phosphorus Loading ◽  
Phosphorus Concentration ◽  
White Clay

Nonpoint source controls were installed in a 1215 ha agricultural watershed in northeastern Wisconsin in the late 1970. Changes were made in handling of animal wastes and cropping practices to reduce runoff of sediment and nutrients. Modelling results predicted a reduction in phosphorus runoff of 30 percent. The water quality of White Clay Lake has worsened since the installation of NPS controls. The lake's phosphorus concentration has increased from a mean of 29 µg L−1 in the late 1970s to 44 µg L−1 in recent years. Water clarity has declined from 2.7 to 2.1 m and the mean summer chlorophyll levels have increased from 9 to 13 µg L−1 with peak values exceeding 40 µg L−1. Increased phosphorus loading is not the result of elevated precipitation but instead the failure of the control measures to sufficiently reduce P loading. Most of the effort was placed on structural changes while most of the P loading comes from cropland runoff. Further, soil phosphorus concentrations have increased because of artificial fertilizers and manure spreading. The White Clay Lake experience is discouraging since the majority of the polluters in this watershed utilized some NPS control practices, including 76 percent of the farms which installed waste management control facilities.

scholarly journals Assessment of Trophic Responses of a Reservoir to Seasonal and Annual Variations in Monsoon

Water ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2117
Author(s):  
Su-mi Kim ◽  
Hyun-su Kim
Keyword(s):  
Water Quality ◽  
Trophic State ◽  
Monsoon Season ◽  
Phytoplankton Growth ◽  
Phosphorus Loading ◽  
Nutrient Concentrations ◽  
Trophic State Index ◽  
Post Monsoon ◽  
Post Monsoon Season ◽  
State Index

The variations in water quality parameters and trophic status of a multipurpose reservoir in response to changing intensity of monsoon rain was investigated by applying a trophic state index deviation (TSID) analysis and an empirical regression model to the data collected in two periods from 2014 to 2017. The reservoir in general maintained mesotrophic conditions, and Carlson’s trophic state index (TSIc) was affected most by TSITP. Nutrient concentrations, particularly phosphorus, did not show strong correlations with precipitation, particularly in the period with weak monsoon, and a significant increase in total phosphorus (TP) was observed in Spring 2015, indicating the possibility of internal phosphorus loading under decreased depth and stability of water body due to a lack of precipitation. TSIChl was higher than TSISD in most data in period 1 when a negligible increase in precipitation was observed in the monsoon season while a significant fraction in period 2 showed the opposite trend. Phytoplankton growth was not limited by nutrient limitation although nutrient ratios (N/P) of most samples were significantly higher than 20, indicating phosphorus-limited condition. TSID and regression analysis indicated that phytoplankton growth was limited by zooplankton grazing in the Spring, and that cell concentrations and community structure in the monsoon and post-monsoon season were controlled by the changing intensity of the monsoon, as evidenced by the positive and negative relationships between community size and cyanobacterial population with the amount of precipitation in the Summer, respectively. The possibility of contribution from internal loading and an increase in cyanobacterial population associated with weak monsoon, in addition to potential for nutrient enrichment in the post-monsoon season, implies a need for the application of more stringent water quality management in the reservoir that can handle all potential scenarios of eutrophication.

Quantifying Lake Water Quality Evolution: Coupled Geochemistry, Hydrodynamics, and Aquatic Ecology in an Acidic Pit Lake

2017 ◽  
Vol 51 (17) ◽  
pp. 9864-9875 ◽  
Author(s):  
S. Ursula Salmon ◽  
Matthew R. Hipsey ◽  
Geoffrey W. Wake ◽  
Gregory N. Ivey ◽  
Carolyn E. Oldham
Keyword(s):  
Water Quality ◽  
Lake Water ◽  
Aquatic Ecology ◽  
Pit Lake ◽  
Lake Water Quality

scholarly journals KAJIAN KUALITAS PERAIRAN UNTUK PERIKANAN DI RAWA PENING JAWA TENGAH

2017 ◽  
Vol 8 (3) ◽  
pp. 173
Author(s):  
Siti Nurul Aida ◽  
Agus Djoko Utomo
Keyword(s):  
Water Pollution ◽  
Water Quality ◽  
Trophic Level ◽  
Carrying Capacity ◽  
Water Hyacinth ◽  
Trophic State ◽  
Fish Growth ◽  
Household Waste ◽  
Trophic State Index ◽  
State Index

Perairan Rawa Peningmerupakan tipe perairan yang tergenang dan mempunyai arti penting bagi perikanan. Masalah utama yang ada di Rawa Pening yaitu pendangkalan karena sedimentasi dan eutrofikasi yang disebabkan pencemaran air berasal dari limbah rumah tangga, pertanian dan budidaya perikanan. Penelitian ini bertujuan untukmengetahui tingkat kesuburan perairan dan kualitas air di Rawa Pening. Penelitian dilakukan pada bulan Mei, Juni, Agustus dan Oktober 2013. Frekuensi pengambilan contoh dilakukan empat kali yaitu pada bulan Mei, Juni,Agustus dan Oktober. Stasiun pengamatan meliputi:A. Tengah (Puteran); B.Muara sungai (Torong); C.Area KJA; D. Pemotongan eceng Gondok (tengah 1); E. Sungai keluar (Tuntang); F. Muara sungai (Muncul); G. Tidak ada pemotongan eceng gondok (tengah 2). Data tingkat kesuburan perairan dianalisis dengan metode Carlon’s.Hasil penelitianmenunjukkan bahwa Rawa Pening termasuk katagori perairan dengan tingkat kesuburan tinggi, nilai Thropic State Index (TSI) pada semua stasiun pengamatan berkisar antara 57,22 - 68,06. Kondisi kualitas air yang kurang baik tersebut akanmerugikan perikanan, seperti kejadian kematian ikanmasal, lambatnya pertumbuhan ikan dan penurunan daya dukung perairan.The Rawa Pening waters is a lentic water and has significance for fishery. The main problems in Rawa Pening are silting due to sedimentation and eutrophication due to water pollution from household waste, agriculture and fisheries. The study aims to examine trophic level and water quality. The research conducted on May, June, August and October 2013. There was 7 stations i.e. A. middle (Puteran); B. inlet of Torong; C. Location of aquaculture;D. locations where harvesting of water hyacinth occurred (middle1); E. outlet (Tuntang); F. inlet (Muncul); G. location where no harvest of water hyacinth (middle 2). Trophic level were analyzed by Carlon’s method. The results showed that Rawa Pening waters categorized as the high eutrophication level where the Trophic State Index (TSI) was 57. 22 to 68. 06. The low water quality will be detrimentaled to fisheries, such as mass fish death, slow fish growth and also a decline of carrying capacity of ecosystem.

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