A Novel Approach to Evaluate Feeding by Mixed Cyprinid Species in a Chinese Integrated Fish Culture Pond Using Measurements of Chlorophyll Derivatives and Photosynthesis in Gut Contents

1993 ◽  
Vol 50 (5) ◽  
pp. 946-952 ◽  
Author(s):  
Noriko Takamura ◽  
Ja-Le Li ◽  
He-Quan Yang ◽  
Xue-Bao Zhu ◽  
Taizo Miura
Keyword(s):  
Aquatic Plants ◽  
Silver Carp ◽  
Fish Culture ◽  
Ctenopharyngodon Idella ◽  
Gut Contents ◽  
Hypophthalmichthys Molitrix ◽  
Pigment Analysis ◽  
Chl A ◽  
Cyprinid Species ◽  
Chlorophyll Derivatives

Chlorophyll derivatives and algal photosynthesis in the guts of five reared cyprinid species were studied to quantify feeding by cyprinids in a Chinese integrated fish culture pond. Pigment analysis identified organic detritus that had been overlooked by microscopic observation. The high ratios of Chl b/Chl a and of pheophorbide a/Chl a were good indicators of herbivory on aquatic plants and zooplanktivory, respectively. High photosynthetic rates in faeces indicated herbivory on phytoplankton. Grass carp (Ctenopharyngodon idella) fed mostly on aquatic plants. Blunt snout bream (Megalobrama amblyocephala) selected plants, but also fed on filamentous algae and zooplankton. Silver carp (Hypophthalmichthys molitrix) fed on phytoplankton most frequently among the five carp species examined, but also utilized zooplankton and amorphous detritus, probably originating from plant fragments. Bighead (Aristichthys nobilis) and crucian carp (Carassius auratus) utilized zooplankton and plant fragments. Planktivorous production in this pond was partly supported by a large amount of plant debris, derived from the faeces of grass-eating cyprinids and nourished by microorganisms in the pond water.

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.

Impact of Feeding Activity of Silver Carp on Plankton Removal from a High-Rate Pond Effluent

2005 ◽  
Vol 40 (2) ◽  
pp. 191-201 ◽  
Author(s):  
Nadia Berday ◽  
Driss Zaoui ◽  
Abdeljaouad Lamrini ◽  
Mustapha Abi
Keyword(s):  
Feeding Activity ◽  
Silver Carp ◽  
Treatment Plant ◽  
High Rate ◽  
Fish Pond ◽  
Gut Contents ◽  
Hypophthalmichthys Molitrix ◽  
Technology System ◽  
Solids Concentration ◽  
Plankton Communities

Abstract The effect of silver carp (Hypophthalmichthys molitrix Val.) feeding activity on the plankton communities in a high-rate pond technology system (HRPTS) effluent was investigated over a period of 100 days. The experiment was conducted at the experimental wastewater treatment plant of the Agronomic and Veterinary Medicine Institute (AVI) of Rabat, Morocco, using a HRPTS in a fish pond receiving the plant effluent. The effluent was highly dominated by phytoplankton (99.95%). Silver carp could survive and grow in the fish pond. Production was 37 kg with a very low mortality rate (12%). The high specific intestine weight (7%) and intake rates of biomass and phytoplankton by silver carp (616 g kg-1 of fish day-1 and 1.6 x 1011 cell kg-1 of fish day-1, respectively) demonstrated the importance of the feeding activity of the fish. Zooplankton intake rates were lower (2 x 107 bodies kg-1 of fish day-1). The high intestine index (3 to 4.3 for fish sizes of 14 to 22 cm) and the dominance of phytoplankton in the gut contents (99.95%) confirmed an omnivorous/ phytoplanctivorous diet. Silver carp were efficient in removing plankton from the HRPTS effluent. The net removal yields of biomass were 285 g m-3 day-1 and 322 g kg-1 of fish day-1, 7 x 1010 algal cells kg-1 of fish day-1 and 8.7 x 107 zooplankton bodies kg-1 of fish day-1, with net removal rates of 47, 64 and 62%, respectively. The total suspended solids concentration decreased from 211 in the inflow to 112 mg L-1 in the fish pond.

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.

scholarly journals Status of Chinese Carp Fisheries in Tunisian Freshwater Reservoirs: Threats and Opportunities

2021 ◽  
Vol 2 (10) ◽  
pp. 945-953
Author(s):  
Sami Mili ◽  
Rim Ennouri ◽  
Manel Fatnassi ◽  
Tahani Chargui ◽  
Hajer Zarrouk ◽  
...  
Keyword(s):  
Native Species ◽  
Aquatic Vegetation ◽  
Silver Carp ◽  
Bighead Carp ◽  
Ctenopharyngodon Idella ◽  
Hypophthalmichthys Molitrix ◽  
Artificial Breeding ◽  
Canal Systems ◽  
The Impact ◽  
Technical Centre

The current paper aims to diagnose the state of fisheries of three Chinese carp species whish have been introduced in Tunisian reservoirs since 1981: (silver carp Hypophthalmichthys molitrix, herbivorous carp Ctenopharyngodon idella and bighead carp Aristichthys nobilis) and seeks to study the benefits and risks associated with their introduction. Chinese carps cannot reproduce naturally in freshwater reservoirs. Eventually, artificial breeding operations and seeding of the dams with farm-produced fry are carried out by the Technical Centre of Aquaculture every year. Statistical analyses have shown a strong correlation between the landed quantity and the number of fries stocked each year. The impact assessment showed that the risks and benefits associated with the introduction of the three species are variable. Regarding their benefits, it was clear that the herbivorous carp has provided effective and sustainable control of the extensive development of aquatic vegetation in the eutrophic reservoirs and canal systems. The value of the other two species, though, remains less obvious, particularly for the bighead carp. The consequences of their introduction on ecosystems and native species seem to be negligible, especially when the densities are low. Eventually, it seems judicious to increase the stocking of the herbivorous carp, silver carp and bighead carp in Tunisian reservoirs.

Sign in / Sign up

Export Citation Format

Share Document