scholarly journals Observations of carbon-nitrogen manipulation and periphyton growth stimulation on fish farming in an integrated intensive-extensive aquaculture system

2019 ◽  
Vol 27 (4) ◽  
pp. 169-177
Author(s):  
Ludmiła Kolek ◽  
Maciej Pilarczyk ◽  
Michał Inglot ◽  
Bartłomiej Stonawski ◽  
Joanna Szczygieł
Keyword(s):  
Water Quality ◽  
Silver Carp ◽  
Nutrient Retention ◽  
Fish Farming ◽  
Growth Stimulation ◽  
Nutrient Utilization ◽  
Fish Production ◽  
Hypophthalmichthys Molitrix ◽  
Chondrostoma Nasus ◽  
Fish Tanks

Abstract The results of observations of intensive sturgeon production integrated with an extensive earthen fish pond are described. The main objective of the study was to show how technological modifications applied to enhance nitrogen assimilation in ponds and nutrient retention in aquaculture products influenced fish production. Each of two integrated systems, A and B, consisted of four intensive fish tanks stocked with sturgeon and one extensive carp pond stocked with carp (Cyprinus carpio L.), silver carp (Hypophthalmichthys molitrix (Val.)) and common nase (Chondrostoma nasus L.). The fish tanks were supplied with water from the extensive pond and the effluent from the tanks was discharged into the same pond, which acted as a biological filter for fish production. System B pond was supplemented with carbohydrates (methanol) and plastic substrates for periphyton development that were installed to increase nutrient utilization. The results of the observations showed better water quality and higher fish production in pond B, but no differences were noted in sturgeon growth performance in system A. The combination of these modifications appeared to be an efficient way of increasing nutrient retention and improving water quality.

Modern features of aquaculture of cyprinids in the republic of Iraq

2020 ◽  
pp. 6-14
Author(s):  
Farhan Yasin Hamed ◽  
Adelia Zakirovna Anokhina ◽  
Natalia Viktorovna Sudakova ◽  
Damelya Kazhigalievna Magzanova
Keyword(s):  
Silver Carp ◽  
Stocking Density ◽  
Fish Farming ◽  
Pond Water ◽  
Government Support ◽  
Bighead Carp ◽  
Ctenopharyngodon Idella ◽  
Natural Food ◽  
Hypophthalmichthys Molitrix ◽  
Fish Farms

It is shown that the leading role in the aquaculture of Iraq belongs to Cyprinids, which account for over 80 % of all fish farming production. The most widespread in the country are four main world species of carp aquaculture: common carp (Cyprinus carpio), grass carp (Ctenopharyngodon idella), silver carp (Hypophthalmichthys molitrix) and bighead carp (Aristichthys nobilis). Basically, the traditional technology of growing Cyprinids in ponds is used, which includes the main fish farming processes: care of broodstock to prepare them for spawning, collecting eggs and milt, eggs fertilization and incubation of embryos, raising juveniles and marketable fish. Currently, there are about 2 thousand private fish farms, which have ponds of various sizes from 4 to 100 hectares. Cultivation of Cyprinids in Iraq is carried out mainly by extensive methods: the use of the natural food base of reservoirs with low fish stocking density in polyculture. The fish productivity of ponds varies greatly in different fish farms from 1,5 to 6 t/ha, which is due to economic reasons. The data on changes in the temperature of pond water during the year and hydrochemical indicators are given, which shows favorable conditions for Cyprinids rearing. Information on the use of compound feeds for growing carp in ponds is provided, and data on the composition and nutritional value of the feed used. The fish culture indicators for the main biotechnical processes of the rearing of four Cyprinid species in Iraq are described in detail. In the conclusion, it is indicated that for the effective development of aquaculture in Iraq, government support is needed in the form of a developed long-term program and legislative acts.

Excess propagation and biological control of zooplanktonic Cyclops in drinking water sources

2005 ◽  
Vol 52 (8) ◽  
pp. 151-159 ◽  
Author(s):  
F.-Y. Cui ◽  
T. Lin ◽  
D.-M. Liu ◽  
L.-Q. Zhang
Keyword(s):  
Water Quality ◽  
Biological Control ◽  
Drinking Water ◽  
Biological Effects ◽  
Silver Carp ◽  
Water Sources ◽  
Bighead Carp ◽  
Hypophthalmichthys Molitrix ◽  
Water Safety ◽  
Drinking Water Sources

Starting with the occurrence of Cyclops in drinking water sources and its danger to drinking water safety, we extensively investigated the nature of its excess propagation by analyzing the effect of living space and predator pressure in the food chain on its survival. Then we developed an ecological project using fish biomanipulation, different to the conventional fishery culture technique, to control excess propagation of Cyclops. The control effects on Cyclops of four species of fish were investigated experimentally at a stocking density of 30g/m3 of water. Results showed that the food habit of the fish had a significant influence on the biological control of Cyclops. The propagation of Cyclops could be controlled effectively and also the water quality improved simultaneously by stocking filter-feeding fish, such as silver carp (Hypophthalmichthys molitrix) and bighead carp (Aristichthys nobilis). However, herbivorous Ctenopharyngodon idellus and omnivorous Cyprinus carpio had no obvious biological effects on controlling the growth of Cyclops and restoring water quality. The results further proved that under conditions of proper poly-culture densities of silver carp and bighead carp, the number of Cyclops might be controlled at very low levels and eutrophication might be abated by removing nutrients from the water body.

scholarly journals Optimization of high density long duration transportation of silver carp (Hypophthalmichthys molitrix) and rui (Labeo rohita) fingerlings

2018 ◽  
Vol 27 (1) ◽  
pp. 9-16
Author(s):  
Mahmud Hasan
Keyword(s):  
Water Quality ◽  
Labeo Rohita ◽  
Silver Carp ◽  
Stomach Contents ◽  
Hypophthalmichthys Molitrix ◽  
Oxygen Injection ◽  
Minimum Concentration ◽  
Long Duration ◽  
Transport Experiment

The effects of density (50, 55 and 60 kg fingerlings/drum of 200 litre) on the mortality and essential water quality variables were assessed for silver carp Hypophthalmichthys molitrix fingerlings in a simulated transport experiment. The second experiment involved the determination of the effects of knowing the optimum loading density 50 kg/drum fingerlings on the mortality and water quality in silver carp advanced fingerlings for standard 8 hours transport simulation. Six hours of simulation duration resulted in less than 1% mortality and 8 hours caused about 6%. Third experiment with highest density 60 kg/drum fingerlings at 500 g/l of advanced rui (Labeo rohita) fingerlings was used for a period of 6 hours since the quality of the transport medium was deteriorated due to regurgitated stomach contents. The fingerlings were unconditioned and fed. Level of immediate mortality was only nearly 3% at 6 hours of simulation duration. This study has clearly demonstrated that the optimum loading of silver carp fingerlings per drum is 50 kg. The minimum concentration of dissolved oxygen (DO) concentration for maximum survival is 2 mg/l for silver carp fingerlings. Silver carp advanced fingerlings can be transported for 8 hours duration by using 2 phenoxyethanol at the concentration of 115 μl/l with oxygen injection. Rui advanced fingerlings can be transported at 60 kg/drum (500 g/l) for 6 hrs duration even if the fingerlings are unconditioned. Dhaka Univ. J. Biol. Sci. 27(1): 9-16, 2018 (January)

Improved rice-fish farming in the northern uplands of Vietnam.

2020 ◽  
Author(s):  
Xuan Cuong Nguyen
Keyword(s):  
Silver Carp ◽  
Stocking Density ◽  
Fish Farming ◽  
Rice Fields ◽  
Fish Culture ◽  
Ctenopharyngodon Idella ◽  
Natural Food ◽  
Hypophthalmichthys Molitrix ◽  
Culture Techniques ◽  
Rice Fish

Abstract Rice fish culture has been practiced for a long time in the northern uplands of Vietnam. It is quite an extensive farming practice using space in the rice fields for local fish species such as common carp (Cyprinus carpio) and crucian carp (Carassius carassius) and utilizing natural food produced from manure fertilisation. In the last decade, improved culture techniques have been introduced through development projects and rice-fish culture systems are being gradually improved. The rice fields were modified, with trenches and fish refuges constructed. Cultured species were diversified, which included grass carp (Ctenopharyngodon idella), silver carp (Hypophthalmichthys molitrix), Nile tilapia (Oreochromis niloticus) and silver barb (Barbonymus gonionotus). Local farmers became aware of the benefits of using large size fingerlings and a suitable stocking density. Apart from the natural food found in the rice fields, agricultural by-products were used as supplementary feed for fish. As a result, fish yields significantly increased. In addition to rice, farmers can obtain about 440 kg of fish ha-1 of rice field.

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