scholarly journals EFFECT AND COMPARISON OF RECYCLING AND STAGNANT FRESHWATER ON PERFORMANCES (GROWTH AND SURVIVAL RATES; FISH QUALITY) AND PROFITABILITY OF THE ORNAMENTAL FISH Barbus schwanefeldi (KAPIAT) REARED AT 4 DIFFERENT DENSITIES

2007 ◽  
Vol 2 (2) ◽  
pp. 159
Author(s):  
Sudarto Sudarto ◽  
Agus Priyadi ◽  
Jack Slembrouck ◽  
Laurent Pouyaud ◽  
I Wayan Subamia
Keyword(s):  
Water Quality ◽  
Optimal Condition ◽  
Survival Rates ◽  
Water Systems ◽  
Ornamental Fish ◽  
Fish Production ◽  
Fish Quality ◽  
Growth And Survival ◽  
Recirculation System

<p>Comparing two different rearing systems in fish production through stagnant and recirculation water systems showed that recirculation system has several benefits such as reducing manpower, and minimize or eliminate in using antibiotics and also eliminate the grow out of diseases, increasing the profits due to increase in density of fish cultured in the system, and water quality remain stable in optimal condition.</p>

scholarly journals Pengaruh warna wadah terhadap pertumbuhan dan kelangsungan hidup ikan badut (Amphiprion ocellaris)

2018 ◽  
Vol 5 (2) ◽  
pp. 88
Author(s):  
Zulfikar Zulfikar ◽  
Erlangga Erlangga ◽  
Zakiatul Fitri
Keyword(s):  
Water Quality ◽  
Survival Rate ◽  
Economic Value ◽  
Quality Parameters ◽  
Ornamental Fish ◽  
Growth And Survival ◽  
Randomized Design ◽  
Rate Of Increase ◽  
Completely Randomized Design ◽  
Fish Survival

AbstrakIkan badut merupakan ikan hias air laut yang mempunyai nilai ekonomis tinggi. Penelitian ini dilaksanakan pada bulan September 2017 di Laboratorium Hatchery Pembenihan Program Studi Budidaya Perairan Fakultas Pertanian Universitas Malikussaleh. Tujuan dari penelitian ini adalah untuk mengetahui warna wadah yang terbaik untuk percepatan pertumbuhan dan kelangsungan hidup benih ikan badut. Metode yang digunakan dalam penelitian ini adalah Rancangan Acak Lengkap non faktorial (RAL) dengan empat perlakuan dan tiga kali ulangan dengan wadah warna biru, hijau, merah, dan kuning. Parameter yang diamati dalam penelitian ini adalah pertumbuhan panjang dan bobot ikan, kelangsungan hidup, dan kualitas air. Hasil penelitian menunjukkan penggunaan warna wadah biru memberi pengaruh yang sangat nyata terhadap pertambahan panjang dan kelangsungan hidup ikan badut. Sedangkan pertambahan bobot berbeda nyata. Adapun angka pertambahan panjang, bobot, dan presentase SR terbaik terdapat pada perlakuan A (biru) yaitu 0,19 cm, 0,08 gram dengan presentase kelangsungan hidup 95% ikan badut. Parameter kualitas air yang diukur selama penelitian sesuai dengan kehidupan ikan badut dengan kisaran Suhu 26-290C, Salinitas 30-34 ppt, pH 7-8, and DO 4-7 (mg/L).Kata kunci: ikan badut; kelangsungan hidup; pertumbuhan; warnaAbstractClown fish is a marine ornamental fish that has high economic value. This research was conducted in September 2017 at Hatchery Laboratory Aquaculture, Faculty of Agriculture, University of Malikussaleh. The purpose of this research to determine the color container for growth and survival rate of clown fish. The method used was Completely Randomized Design (CRD). With 4 treatments and 3 replications with blue, green, red, and yellow containers. The parameters observed in this research were length growth and weight of fish, survival, and water quality. The results showed that the use of blue container color was very significantly affect on the length and survival of clown fish. While weight gain significantly different. The rate of increase length, weight, and survival rate percentage best found in treatment A (blue) 0.19 cm, 0.08 grams with survival rate percentage 95%. Water quality parameters during the research were in accordance with clown fish life with temperature range 26-29 0C, Salinity 30-34 ppt, pH 7-8, and DO 4-7 (mg/L).Keywords: clown fish; survival rate; growth; color

scholarly journals Pengaruh perbedaan sistem resirkulasi dan sistem konvensional terhadap pertumbuhan dan sintasan benih kuda laut (Hippocampus comes)

2019 ◽  
Vol 6 (2) ◽  
pp. 64
Author(s):  
Erlangga Erlangga ◽  
Zulfikar Zulfikar ◽  
Syawaluddin Akbar
Keyword(s):  
Water Quality ◽  
Weight Gain ◽  
Survival Rate ◽  
Experimental Method ◽  
Conventional System ◽  
Growth And Survival ◽  
Recirculation System ◽  
Different Types ◽  
Conventional Methods ◽  
Conventional Systems

AbstrakTujuan penelitian ini adalah untuk mengetahui pengaruh penggunaan sistem resirkulasi dan sistem konvensional terhadap pertumbuhan dan sintasan benih kuda laut (Hippocampus comes). Manfaat penelitian ini yaitu untuk mengetahui perbedaan sistem resirkulasi dan sistem konvensional terhadap pertumbuhan benih kuda laut (Hippocampus comes). Metode yang digunakan dalam penelitian ini adalah metode eksperimen dengan menggunakan dua jenis perlakuan yang berbeda dengan 2 perlakuan 3 ulangan. Adapun Perlakuan yang digunakan adalah sebagai berikut :Perlakuan A = Benih kuda laut dipelihara pada sistem resirkulasi Perlakuan B = Benih kuda laut dipelihara pada sistem konvensional. Hasil penelitian menunjukkan bahwa pemeliharaan kuda laut dengan mengguanakan sistem konvesional daan sistem resirkulasi terdapat pertambahan bobot dan pertambahan panjang serta kelangsungan hidup yang normal atau sesuai. Pada pertumbuhan bobot sistem resirkulasi dengan berat 0,07 gr dan panjang 0,63 cm serta kelangsungan hidup 100%. Sedangkan pada sistem konvesional pertambahan bobot 0,05 gr dan pertambahan panjang 0, 58 cm serta kelangsungan hidup 60%. Nilai kualitas air masih berada pada kadar optimum dengan suhu berkisar antara 26-27 0C, pH berkisar antara 7,52-7,57 DO berkisar antara 6,04-6,16 ppm dan amoniak berkisar antara 0,121-0,262 ppm , nitrit 0,104-0,158 ppm.Kata kunci: kuda laut; system resirkulasi; system konvensional; kelangsungan hidupAbstractThe purpose of this study was to determine the effect of using conventional and recirculation systems on growth and survival rate of seahorse fingerling (Hippocampus comes). The benefits of this research are to find out the differences in recirculation systems and conventional systems for the growth of seahorse seeds (Hippocampus comes). The method used in this study is the experimental method using two different types of treatment with two treatments three replications. The procedures used are as follows: Treatment A = Seahorse seeds are maintained in the recirculation system Treatment B = Seahorse seeds are maintained in conventional systems. The results showed that the maintenance of seahorses by using conventional methods and recirculation systems had weight gain and normal or appropriate increase in length and survival. In the growth of the recirculation system weights 0.07 gr and 0.63 cm long and 100% survival. Whereas in conventional systems the weight gain is 0.05 g and the increase in length is 0, 58 cm and survival is 60%. The value of water quality is still at optimum levels with temperatures ranging from 26-27 0C, pH ranges from 7.52-7.57 DO ranging from 6.04 to 6.16 ppm and ammonia ranges from 0.121-0.262 ppm, nitrite 0.104- 0.158 ppm.Keywords: seahorses; recirculation system; conventional system; survival rate

scholarly journals REARING TRIAL ON BOTIA (Chromobotia macracanthus Bleeker 1852) BROODSTOCK POTENTIAL ORNAMENTAL FISH WITH AND WITHOUT SHELTER

2020 ◽  
Vol 5 (2) ◽  
pp. 129
Author(s):  
Asep Permana
Keyword(s):  
Water Quality ◽  
Feed Efficiency ◽  
Growth Response ◽  
Ornamental Fish ◽  
Gonad Maturation ◽  
Male Fish ◽  
Total Length ◽  
Recirculation System ◽  
Marketable Size ◽  
Water Height

Botia fish (clown loach) growth is relatively slow, taking 4-5 months to reach marketable size (2 inch) and 3 years to achieve initial gonad maturation in female and 1 year in male fish. Environmental degradation and overfishing are factors triggering the production of newly potential broodstock. This study aimed to observe the growth response of potential broodstock through rearing technique with and without shelter. Fish were kept inside the aquaria sized 80x40x30 cm with 20 cm water height on the recirculation system. Fish used for shelter treatment were: Total length ± 7.7 cm, height ± 2.09 cm, and weight ± 7.33 g; for no shelter treatment were: Total length ± 6.7 cm, height ± 1.88 cm, and weight ± 4.59 g. Fish were stocked 10 fish / aquarium and fed 3 times / day by at satiation method. Parameters observed were total length, height and weight improvement also water quality. The results showed that growth and feed efficiency had better value when reared with shelter than without shelter.

scholarly journals Effectiveness of rearing Sandfish, Holothuria scabra and Seaweed, Gracilaria sp. with the Polyculture System

2019 ◽  
Vol 7 (1) ◽  
pp. 266
Author(s):  
Pitjont Tomatala ◽  
Petrus P. Letsoin ◽  
Evangelin M.Y. Kadmaer
Keyword(s):  
Water Quality ◽  
Sea Cucumber ◽  
Economic Value ◽  
Survival Rates ◽  
Added Value ◽  
Predator Control ◽  
Sea Cucumbers ◽  
Growth And Survival ◽  
Absolute Growth ◽  
Quality Measurements

Sandfish (Holothurai scabra) and seaweed Gracilaria sp are marine commodities that have economic value and have good prospects in the market. These two commodities, if rearing together, will certainly provide added value to farmers. This research aims to determine the potential of sea cucumber polyculture, (H. scabra) and Gracilaria sp. which is maintained in culture. This research was conducted in April - May 2018 in the coastal of Rat village, Southeast Maluku Regency. Sea cucumbers are weighed and stocked on Pen-culture (measuring 4 x 3 meters) with a density of 40 individuals / Pen-culture. Gracilaria seeds are taken from young thallus which are tied into one clump and ditagging. After that, Gracilaria was weighed and spread in Pen-culture of 20 clump / Pen-culture. Observation of growth and survival of sandfish and Gracilaria sp done once a week. At the same time, predator control is carried out on pen-culture and water quality measurements. The results showed that sea cucumbers experienced absolute growth and survival rates of 18.20 g and 92.5% respectively. Gracilaria sp which is maintained does not experience growth, while the percentage of survival of Gracilaria sp is 20%. Based on the results of the research it can be concluded that Polyculture of sandfish, H. scaba and seaweed, Gracilria sp is not effective if Gracilria sp is stocked on the basis of Pen-culture.Keyword : Sandfish, Gracilaria, PolycultureABSTRAKTeripang pasir (Holothurai scabra) dan rumput laut Gracilaria sp merupakan komuditi laut yang bernilai ekonomis dan mempunyai prospek yang baik dipasaran. Kedua komuditi ini, jika dipelihara bersama tentunya akan memberikan nilai tambah bagi pembudidaya. Penelitian ini bertujuan untuk mengetahui potensi polikultur teripang pasir, (H. scabra) dan Gracilaria sp. yang dipelihara pada pen-culture.Penelitian ini dilaksanakan pada bulan April – Mei 2018 di perairan desa Rat, Kabupaten Maluku Tenggara. Teripang pasir ditimbang dan ditebar pada Pen-culture berukuran 4 x 3 meter dengan kepadatan 40 individu/Pen-culture. Bibit Gracilaria diambil dari thallus muda yang diikat menjadi satu rumpun dan ditagging. Setelah itu, Gracilaria ditimbang dan ditebar pada Pen-culture sebanyak 20 rumpun/ Pen-culture.Pengamatan pertumbuhan dan kelangsungan hidup teripang pasir dan Gracilaria sp. dilakukan  seminggu sekali. Pada waktu yang bersamaan, dilakukan juga pengontrolan predator pada Pen-culture dan pengukuran kualitas air. Hasil penelitian diketahui bahwa teripang mengalami rata-rata pertumbuhan mutlak dan kelangsungan hidup, masing-masing sebesar 18.20 g dan 92.5 %. Gracilaria sp yang dipelihara tidak mengalami pertumbuhan, sedangkan presentase kelangungan hidup Gracilaria sp sebesar 20 %. Berdasarkan hasil penelitian dapat disimpulkan bahwa Polikultur teripang pasir, H. scaba dan rumput laut, Gracilria sp tidak efektif jika Gracilria sp ditebar pada dasar Pen-culture. Kata kunci : Teripang pasir, Gracilaria, Polikultur

Sewers and the Quality of Canals and Ditches in Amsterdam

1993 ◽  
Vol 27 (5-6) ◽  
pp. 61-67 ◽  
Author(s):  
E. Jacobs ◽  
J. W. van Sluis
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Sediment Quality ◽  
Water System ◽  
Water Systems ◽  
Sewer System ◽  
Water And Sediment ◽  
Combined Sewer ◽  
Water And Sediment Quality

The surface water system of Amsterdam is very complicated. Of two characteristic types of water systems the influences on water and sediment quality are investigated. The importance of the sewer output to the total loads is different for both water systems. In a polder the load from the sewers is much more important than in the canal basin. Measures to reduce the emission from the sewers are much more effective in a polder. The effect of these measures on sediment quality is more than the effect on water quality. Some differences between a combined sewer system and a separate sewer system can be found in sediment quality.

scholarly journals Risk-based principles for defining and managing water security

2013 ◽  
Vol 371 (2002) ◽  
pp. 20120407 ◽  
Author(s):  
Jim Hall ◽  
Edoardo Borgomeo
Keyword(s):  
Water Quality ◽  
Public Policy ◽  
Risk Management ◽  
Water Security ◽  
Water Systems ◽  
Economic Systems ◽  
Water Resources Planning ◽  
Widespread Application ◽  
Trade Offs ◽  
Resources Planning

The concept of water security implies concern about potentially harmful states of coupled human and natural water systems. Those harmful states may be associated with water scarcity (for humans and/or the environment), floods or harmful water quality. The theories and practices of risk analysis and risk management have been developed and elaborated to deal with the uncertain occurrence of harmful events. Yet despite their widespread application in public policy, theories and practices of risk management have well-known limitations, particularly in the context of severe uncertainties and contested values. Here, we seek to explore the boundaries of applicability of risk-based principles as a means of formalizing discussion of water security. Not only do risk concepts have normative appeal, but they also provide an explicit means of addressing the variability that is intrinsic to hydrological, ecological and socio-economic systems. We illustrate the nature of these interconnections with a simulation study, which demonstrates how water resources planning could take more explicit account of epistemic uncertainties, tolerability of risk and the trade-offs in risk among different actors.

scholarly journals Comparative Growth Performance of Oreochromis Hybrids and Selectively-Bred Strain (F8) in Malawi

2016 ◽  
Vol 5 (4) ◽  
pp. 13 ◽  
Author(s):  
Daud Kassam ◽  
Marcus Sangazi
Keyword(s):  
Water Quality ◽  
Growth Performance ◽  
Crude Protein ◽  
Experimental Period ◽  
Quality Parameters ◽  
Conversion Ratio ◽  
Food Conversion ◽  
Growth And Survival ◽  
Maize Bran ◽  
Better Than

<p>Most fish farmers in Malawi culture unimproved fish strains whose growth is slow and mature while still small. Four strains of <em>Oreochromis</em>, namely; selectively-bred/improved <em>O. shiranus</em> (F<sub>8</sub>), two reciprocal F<sub>1</sub> <em>Oreochromis</em> hybrids, and <em>O. karongae</em> as a control (mean weight 2.5 ± 0.7 g) were stocked at a density of 5fish/m<sup>2 </sup>in 9m<sup>2 </sup>hapas replicated three times, and cultured for 90 days at Bunda Fish Farm. Fish were fed twice a day with feed formulated using maize bran and soybean containing 30% crude protein throughout the experimental period. The final mean weights were significantly different (p&lt;0.05) across the treatments whereby; hybrid <em>O. shiranus</em> (male) X <em>O. karongae</em> (female) was 12.09g, hybrid <em>O. shiranus</em> (female) X <em>O. karongae</em> (male) was 9.72g, improved <em>O. shiranus</em> (F<sub>8</sub>) registered 9.23g, and <em>O. karongae</em> was the least with 9.00g. Apparent food conversion ratio was also statistically different (p&lt;0.05) across the treatments whereby; <em>O. karongae</em> was 3.63, hybrid <em>O. shiranus</em> (female) X <em>O. karongae</em> (male) was 3.25, improved <em>O. shiranus</em> (F<sub>8</sub>) was 3.16 and hybrid <em>O. shiranus</em> (male) X <em>O. karongae</em> (female) was lowest with 2.26. There were no significant differences on the water quality parameters across the treatments throughout the experimental period and were within the required ranges for growth and survival of tilapias fish species. The results suggest that <em>Oreochromis</em> hybrids may be suitable candidates for aquaculture in terms of production as they performed better than the improved <em>O. shiranus</em> and the control <em>O. karongae</em>.</p>

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