scholarly journals Inventarisasi dan Komposisi Jenis Ektoparasit Ikan Nila (Oreochromis niloticus) Sebagai Biomonitoring Perairan Sungai Tukad Badung, Bali

2018 ◽  
Vol 5 (1) ◽  
pp. 89
Author(s):  
Alfi Hermawati Waskita Sari ◽  
Rani Ekawaty
Keyword(s):  
Water Quality ◽  
Ecosystem Management ◽  
Oreochromis Niloticus ◽  
Parasite Species ◽  
Environmental Stressors ◽  
River Ecosystem ◽  
River Waters ◽  
Anthropogenic Wastes

Environmental stressors which coming from anthropogenic wastes that indirectly enters into the river waters also affect the biota's health in the ecosystem such as the Tilapia Fish (Oreochromis niloticus) which is found in the waters of the Tukad Badung River, Bali. The presence of parasites in fish is also associated with changes of the water quality. The objectives of this study is to provide data and information on the inventory and composition of the parasite species in Tilapia fish (Oreochromis niloticus) as the aquatic health biomonitoring of in the effort of sustainable river ecosystem management. The results of ectoparasit observation of the Tilapia which obtained from five stations in Tukad Badung waters found 6 types of ectoparasites, which are Trichodina sp. Dactylogyrus sp. Gyrodactylus sp., Chilodonella sp., Vorticella sp. and Lernea sp. The composition of the ectoparasite species of nila tilapia fish (Oreochromis niloticus) obtained from all five research stations in Tukad Badung waters by percentage of presence of ectoparasite Trichodina sp. are 70%, Dactylogyrus sp. 31%, Gyrodactylus sp. 4% and Chilodonella sp., Vorticella sp. and Lernea sp.  1%.

Abnormal pH elevation in the Chaobai River, a reclaimed water intake area

2017 ◽  
Vol 19 (2) ◽  
pp. 111-122 ◽  
Author(s):  
Bao-nan He ◽  
Jiang-tao He ◽  
Jian Wang ◽  
Jie Li ◽  
Fei Wang
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
River Water ◽  
Ecosystem Management ◽  
Water Intake ◽  
Theoretical Basis ◽  
Reclaimed Water ◽  
River Ecosystem ◽  
Water Quality Improvement ◽  
Ph Elevation

Understanding the main reasons causing pH elevation in river water has important implications for river ecosystem management and improvement of water quality and can provide a theoretical basis for the direction of water quality improvement.

Population characteristics of Oreochromis niloticus (Linnaeus, 1758) in light of varying water quality conditions of adjoined Lakes Naivasha and Oloidien in Kenya

2020 ◽  
Vol 01 (01) ◽  
pp. 54-71
Author(s):  
Alice Mutie ◽  
◽  
Edna Waithaka ◽  
George Morara ◽  
Priscilla Boera ◽  
...  
Keyword(s):  
Water Quality ◽  
Oreochromis Niloticus ◽  
Quality Parameters ◽  
Population Characteristics ◽  
Lake Naivasha ◽  
Habitat Conditions ◽  
Relationship Analysis ◽  
Relative Condition Factor ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Main Lake

Nile tilapia Oreochromis niloticus (L.) is a recent re-introduction in Lake Naivasha and is one of the fish species that has crossed into Lake Oloidien. This study assessed and compared the population characteristic of O. niloticus under different physicochemical conditions of water in L. Naivasha (main) and L. Oloidien. Samples of water for selected water quality parameters and fisheries data from catch survey were collected between 2017 and 2018. Results indicate the highest conductivity levels recorded in 2018 as 2916 ±11.30 µScm-1 and 282.33 ± 4.33 µScm-1 for L. Oloidien and L. Naivasha respectively. Mean total lengths of O. niloticus were 19.1± 1.8 cm and 23.6 ± 2.9 cm for L. Oloidien and L. Naivasha respectively. Mean weight of O. niloticus was 129.3 ± 37.8 g in L. Oloidien and 260.9 ± 81.0 g in L. Naivasha. Length-weight relationship analysis showed a negative allometric growth (b = 2.526) and (b = 2.983; p > 0.05) in lakes Oloidien and Naivasha respectively. The relative condition factor (Kn) values were slightly lower in O. niloticus from L. Oloidien compared to the main Lake. Differences between the two lakes in the population characteristics of O. niloticus may be attributed to the observed differences in the habitat conditions, including the conductivity and pH levels.

Potash mining mountain waste and its contribution to river water salinisation: the case of the Llobregat River, Catalonia, Spain

2021 ◽  
Author(s):  
Joaquim Farguell
Keyword(s):  
Water Quality ◽  
Electrical Conductivity ◽  
River Water ◽  
Water Quality Monitoring ◽  
Mining Activities ◽  
River Ecosystem ◽  
Rainfall Events ◽  
Potash Salt ◽  
Short Period ◽  
Llobregat River

<p>It is well known that mining activities have negative effects on fluvial ecosystems. Such activities alter the water quality by introducing heavy metals and associated pollutants and alter the sediment regime by creating a point source sediment that may affect the entire basin. </p><p>In the Llobregat River, a medium Mediterranean river basin (ca. 5000 km<sup>2</sup>), potash salt mining activities have been undertaken for several decades. Salinisation of surface river water has become an environmental issue of great concern for the water administrators given that the water of this river supplies half of the population of the metropolitan area of Barcelona (ca. 2,500,000 inhabitants) and it is also used for irrigation in the lowermost part of the river and its delta.</p><p>This study aims to describe the magnitude of the dissolved solids inputs that are detected in the river surface water after rainfall events by means of continuous electrical conductivity monitoring. Electrical conductivity records (EC) were obtained from an automatic water quality monitoring station set by the Water Catalan Authorities and located 3 km downstream from the potash mountain waste.  The study also tries to predict the EC peak according to different hydrometeorological parameters selected from the episodes recorded.</p><p>Data analysed was continuously recorded at 15-minute interval between January 1st, 2018 and September 30th, 2020 and a total of 74 EC episodes were considered. Mean EC of the episodes recorded was 3,488 µS/cm, with a standard deviation of 3,638 µS/cm, and a coefficient of variation of 104.3%. The median was 2,390 µS/cm. Data obtained show that after rainfall events a peak of electrical conductivity in the river is detected. However, it exhibits a high variability in its magnitude, ranging from 939 µS/cm up to 26,900 µS/cm. Despite this, the coefficients of determination of the regression lines between the meteorological variables, such as rainfall intensity or total rainfall amount, and the peak EC exhibit poor correlations (R<sup>2</sup>=0.355 and R<sup>2</sup>=0.229, respectively), although they are significant.</p><p>Results indicate that washload processes in the salt mountain waste take place and reach the river producing extremely high EC peak values during a short period of time. Such values can have harmful effects on the river ecosystem and affect the lowerland river area, where water is diverted for potabilization and irrigation purposes. However, the low correlation between rainfall and EC peak indicates that additional variables intervene in the rainfall-runoff processes and further research is required to fully understand the connectivity and transmission of the salt moutain waste into the river. Understanding such processes and analyasing the consequences on the fluvial system, will probably be the way to tackle the restoration of this enormous impact on this river ecosystem.</p>

scholarly journals ANALISIS KARAKTER REPRODUKSI DAN PERFORMA BENIH HIBRID IKAN NILA PANDU F6 DENGAN IKAN NILA NILASA (Oreochromis niloticus) Analysis of the Character Reproduction and Seed Hybrid Performance 0f Tilapia Fish F6 Pandu with Nilasa Tilapia (Oreochromis niloticus)

2017 ◽  
Vol 12 (1) ◽  
pp. 19
Author(s):  
Dio Patria Yustysi ◽  
Fajar Basuki ◽  
Titik Susilowati ◽  
Tristiana Yuniarti
Keyword(s):  
Water Quality ◽  
Growth Rate ◽  
Survival Rate ◽  
Specific Growth Rate ◽  
Oreochromis Niloticus ◽  
Egg Size ◽  
Specific Growth ◽  
Fish Farming ◽  
Hatching Rate ◽  
Feed Conversion

ABSTRAK Penelitian ini bertujuan untuk mengetahui pengaruh dari hibridisasi ikan nila Pandu F6 dengan nila Nilasa terhadap karakter reproduksinya dan performa benih yang dihasilkan. Penelitian ini dilakukan dengan metode eksperimental menggunakan Rancangan Acak Lengkap (RAL) dengan 4 perlakuan dan 3 kali ulangan. Perlakuan dalam penelitian ini: perlakuan A (Pandu F6 ♀><Pandu F6 ♂), B (Nilasa ♀><Nilasa ♂), C (Pandu F6 ♀>< Nilasa ♂), dan D (Nilasa ♀><Pandu F6 ♂). Data yang diamati meliputi fekunditas, daya tetas telur, diameter dan bobot telur, panjang dan bobot larva TL, panjang dan bobot larva lepas kuning telur, kelulushidupan, laju pertumbuhan spesifik, konversi pakan dan kualitas air. Hasil penelitian menunjukan nilai terbaik pada fekunditas sebesar 1191,67 ± 239,45 butir/200 g, daya tetas telur sebesar 80,93 ± 3,90%, kelulushidupan sebesar 81,55 ± 7,54%, laju pertumbuhan spesifik sebesar 7,26 ± 0,25, konversi pakan 0,54 ± 0,02 didapatkan pada perlakuan C, akan tetapi untuk diameter dan bobot telur, panjang dan bobot larva Kuning Telur, dan panjang dan bobot larva lepas kuning telur tidak berbeda nyata. Hasil tersebut menunjukan bahwa hibridisasi (perlakuan C) memberikan pengaruh yang nyata (P < 0,05) terhadap fekunditas, daya tetas telur, kelulushidupan, laju pertumbuhan spesifik, dan konversi pakan tetapi tidak berpengaruh terhadap diameter dan bobot telur, panjang dan bobot larva, dan panjang dan bobot larva lepas kuning telur. Kata kunci: Hibridisasi, Ikan Nila, Karakter Reproduksi, Performa Benih  ABSTRACT This research aims to know the influence of hybridization tilapia fish Pandu F6 with nila Nilasa against the character of the reproduction and seed performance. This research was conducted with the experimental method using Random Design complete (RAL) with 4 treatments and three replicates. The treatments in this study: the treatment A (Pandu F6 F6 ♀ >< Pandu ♂), B (Nilasa ♀>< Nilasa ♂), C (Pandu F6 ♀>< Nilasa ♂), and D (Nilasa ♀ >< Pandu F6 ♂). The observed data covering fecundity, hatching rate, egg size, yolk sack larva length and weight, length and weight of the egg yolk off larvae, survival rate, specific growth rate, feed conversion rate, and water quality. The results showed the best value on the fecundity of 1191.67±239.45 eggs/200 g, Hatching rate 80.93 ± 3.90%, Survival rate of 81.55 ± 7.54%, specific growth rate of 7.26 ± 0.25, conversion fodder 0.54 ± 0.02 obtained at the treatment C, but for the diameter and weight of egg, larval length and weight TL, and the length and weight of the yolk egg off larvae for each treatment do not differ markedly. The results showed that hybridization (treatment C) gives a real influence (P < 0.05) of fecundity,hatching rate, survival rate but not with the egg size, larva weight and length, and the length and weight of larvae off yolk. Water quality on the spawning, hatching eggs and larvae found on the maintenance of a decent range for tilapia fish farming Keywords: hybridization, tilapia fish, character of the reproduction, seed performance 

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