scholarly journals Registry of saprolegniose in fish cultivated in the world: a compilation of data

2020 ◽  
Vol 9 (11) ◽  
pp. e959119556
Author(s):  
Ingrid Tayane Vieira da Silva do Nascimento ◽  
Josielma dos Santos Silva ◽  
Thiago Anchieta de Melo ◽  
Débora Martins Silva Santos ◽  
Ilka Márcia Ribeiro de Souza Serra

Saprolegniosis is a mycological disease that causes significant economic losses in fish culture and can be considered an obstacle to the development of world fish farming. Thus, we aimed to identify which species of fish cultivated in the world have been associated with fungi of the genus Saprolegnia. The research deals with a bibliographical survey that contemplates articles published between 2007 and July of 2017. We found a relationship of saprolegniose with fish species: Oncorhynchus mykiss, Salmo trutta, Oncorhynchus tshawytscha, Labeo rohita, Pterophyllum scalare, Ctenopharyngodon idella, Sander lucioperca, Pelteobagrus fulvidraco, Oreochromis niloticus, Odonthestes bonariensis, Odonthestes humensi e Catla catla. The oomycetes found were: Saprolegnia ferax, Saprolegnia parasitica, Saprolegnia australis, Saprolegnia diclina, Saprolegnia delica, Saprolegnia glomerata, Saprolegnia terrestres, Saprolegnia uliginosa, Saprolegnia unispora, Saprolegnia hypogyna and Saprolegnia longicaulis. The species S. ferax and S. parasitica were the fungi that presented the highest infection register, mainly in salmonids. O. mykiss, S. salar and S. trout were the fish with more studies related to saprolegniose, because they are species that have great market importance in the world fish farming scenario. Despite the great importance of the species O. niloticus in the world fish culture, we observed the specie in only one article in this research, which may be related to the high resistance of the species to diseases and to the lack of research funding to identify this type of infection. It was not possible to compare the host - etiological agent among the fish, since many of the studies considered in the research did not have the purpose of identifying the pathogen.

2016 ◽  
Vol 42 (2) ◽  
pp. 229-234
Author(s):  
Nazia Sultana ◽  
Md Abu Sayed Jewel ◽  
Md Rashedul Kabir Mondol

An experiment was carried out to evaluate the growth performance of carp polyculture system supplemented with different levels of supplementary feed. To undertake this investigation, two earthen ponds were stocked with 25% Labeo rohita, 25% Catla catla, 20% Labeo calbasu, 20% Ctenopharyngodon idella and 10% Hypopthalmichthys molitrix with a total stocking density of 10000/ha. The net fish production was found to be 2,166 and 3,874 kg/ha/yr in pond-01 and pond-02, respectively. The total cost of fish farming of pond-01 and pond-02 were 64,268 BDT and 88,568 BDT per ha. The total return of pond-01and pond-02 were BDT 1,04,280 BDT and 1,69,250 BDT per ha. Net benefit from pond-01 and pond-02 was 40,312 BDT and 80,682 BDT respectively. Net profit margin of pond-01 and pond-02 was 62.73% and 91.10%. And finally the benefit cost ratios (CBR) were found to be 0.62:1 and 0.91:1 in pond-01 and pond-02, respectively. Asiat. Soc. Bangladesh, Sci. 42(2): 229-234, December 2016


2020 ◽  
Author(s):  
Xuan Cuong Nguyen

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.


1997 ◽  
Vol 54 (5) ◽  
pp. 1031-1038
Author(s):  
C A Stow ◽  
L J Jackson ◽  
J F Amrhein

We examined data from 1984 to 1994 for five species of Lake Michigan salmonids to explore the relationship between total PCB concentration and percent lipid. When we compared mean species lipid and PCB values, we found a strong linear correlation. When we compared values among individuals, we found modest positive PCB:lipid associations in brown trout (Salmo trutta), chinook salmon (Oncorhynchus tshawytscha), coho salmon (Oncorhynchus kisutch), and rainbow trout (Oncorhynchus mykiss) collected during spawning, but positive associations were not apparent among nonspawning individuals. Lake trout (Salvelinus namaycush) exhibited no discernible PCB:lipid relationship. Our results are not incompatible with previous observations that contaminants are differentially partitioned into lipids within a fish, but these results do suggest that lipids are not a major factor influencing contaminant uptake.


Author(s):  
S. Seoane ◽  
P. Riobó ◽  
J. Franco

The genus Prymnesium includes several species that produce toxins with cytotoxic, ichthyotoxic, neurotoxic and haemolytic activity. Bloom episodes of Prymnesium species have been reported from several parts of the world (North America, Europe, Africa, Asia and Australia), especially from temperate and subtropical regions and most of them from brackish waters. Blooms cause great economic losses to aquaculture and fisheries around the world. The ichthyotoxic and allelopathic effects of Prymnesium have been linked to the presence of Haemolysin 1, Prymnesins 1 and 2 and, more recently, fatty acids and fatty acid amides. The toxicology of this genus with regard to different growth conditions such as light, nutrients and other parameters has been well documented. It is unknown, however, whether different species and strains from the Prymnesium genus all produce the same types and level of toxins. In this study, we have determined the haemolytic activity of eight different strains from the genus Prymnesium in both exponential and stationary phases of growth. We have also evaluated the efficiency of the extraction solvent.


2021 ◽  
Vol 03 (01) ◽  
pp. 191-196
Author(s):  
Durdona Alisher Qizi Yuldashova ◽  
Keyword(s):  

Covid-19 has revolutionized the economy around the world, including in Uzbekistan. The panic that followed the virus has led to even greater economic losses. In the following thesis, you will learn about employment, unemployment and income changes in Uzbekistan


2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Janu Dwi Kristianto ◽  
Sunardi Sunardi ◽  
Johan Iskandar

AbstrakDanau merupakan salah satu bentuk ekosistem yang menempati daerah yang relatif kecil pada permukaan bumi dibandingkan dengan habitat laut dan daratan. Bagi manusia kepentingannya jauh lebih berarti dibandingkan dengan luas daerahnya. Sejak tahun 1985 Danau Teluk di Kota Jambi mulai digunakan sebagai lokasi budidaya ikan dengan karamba jaring apung (KJA) dengan jumlah KJA yang beroperasi pada tahun 2012 mencapai + 878 unit dari 64 pembudidaya ikan dan akan meningkat terkait penetapan Propinsi Jambi sebagai salah satu kawasan minapolitan perikanan budidaya guna peningkatan produksi perikanan. Pemanfaatan Danau Teluk sebagai media untuk budidaya ikan di KJA diperlukan upaya untuk mendorong pengelolaan terhadap sumberdaya milik umum ini agar terus bekelanjutan. Kajian mengenai dukung perairan dan pemanfaatan daya Danau Teluk Kota Jambi untuk budidaya ikan sistem KJA bertujuan untuk mengetahui daya dukung Danau Teluk yang digunakan untuk kegiatan budidaya ikan di KJA, bagaimana deskripsi pemanfaatan danau untuk budidaya ikan di KJAyang selama ini dilaksanakan oleh masyarakat sekitar dan merumuskan pola pemanfaatan Danau Teluk untuk budidaya ikan di KJA yang berbasis masyarakat secara berkelanjutan. Hasil penelitian menunjukkan  bahwa  daya dukung perairan Danau Teluk Kota Jambi untuk budidaya ikan di KJA adalah sebesar 517,617 ton ikan  per tahun dengan estimasi jumlah pakan di KJA yang diberikan pada ikan sebanyak 931,710 ton pakan ikan per tahun dengan asumsi kadar total P yang masuk ke perairan danau melalui limbah ikan sebanyak 20 kg P/ ton ikan. Jumlah ideal unit KJA yang seharusnya beroperasi di Danau Teluk berdasarkan penghitungan daya dukung danau sebanyak 862, 695 unit ~ 862 unit. Saat ini jumlah KJA yang beroperasi adalah sebanyak 878 unit sehingga perlu dilakukan pengurangan jumlah sebanyak 16 unit. Pemanfaatan Danau Teluk untuk budidaya ikan oleh masyarakat dilakukan secara sederhana dan jumlah KJA yang terdapat ternyata sudah sedikit melebihi daya dukung perairan jika dilihat dari konsentasi Total P yang ada di perairan. Peningkatan jumlah KJA yang ada di danau perlu mendapat perhatian dari pemerintah dan masyarakat setempat. Pola pemanfaatan danau untuk budidaya ikan berbasis masyarakat yang direkomendasikan adalah dengan mengeluarkan ijin usaha budidaya ikan agar kegiatan budidaya ikan dapat terkendali dan tidak merusak lingkungan, menggunakan pola pemeliharaan ikan dengan jaring ganda sehingga biaya operasional lebih efisien dan produksi ikan dapat ditingkatkan, membuat manajemen pakan dalam penerapan budidaya ikan dalam KJA, meningkatkan SDM pembudidaya ikan dan mengaktifkan kembali kelompok pembudidaya ikan sehingga koordinasi antar pembudidaya, pemerintah dan stakeholder terkait dapat terjalin serta pengaturan tata ruang KJA.Kata Kunci : pemanfaatan danau, daya dukung, Danau Teluk, budidaya ikan KJA, berbasis masyarakatAbstracLake is one of ecosytem form than occupies a relative small area on the surface of the earth as compared to sea and land habitats. For humans, utilization  is more important than the expanse of lands. Since 1985, Teluk Lake began to be used as the location of fish cultivation with floating net cage culture (FNCC). The number of FNCC in 2012 reached ± 878 unit of 64 fish farmers and it will increase related to determination of Jambi Province as one of Minapolitan fishery cultivation in order to increase fish production. Utilization of Teluk Lake as media for fish cultivation on floating cage is necessary to encourage the management of common resources is to be kept sustainable.  Studies on carrying capacity and utilization of Teluk Lake Jambi City for community-based fish cultivation on FNCC aims to know how the use of this lake that have been implemented by the local community and to find out patterns of Teluk Lake utilization to fish culture in floating cage sustainable community-based  and to find out how the carrying capacity Teluk lake that used to fish farming activities in floating cage. Methods used in this study is qualitative and quantitative methods with a descriptive approach. 1Result showed that carrying capacity of Teluk lake for fish farming in FNCC is equal  517,617 tons of  fish per year with estimate amount of feed given to fish in floating cage is as many as  931,710 ton per year assuming total P were entered into the lake through fish waste as much 20 k P/ton of fish. Ideal number of floating cage based on lake  carrying capacity accounting should be 862,695 unit ~ 862 unit. Operating floating cage currently  is  878 unit so that it is necessary reduction in the amount of 16 unit and if they want to add a new one, it should be an improvement or replacement of existing floating cage at lake. Utilization of Teluk Lake for fish farming is done simple by local communities and number of existing floating cage already slightly exceed the carrying capacity of lake if related from existing concentration of total P in water. The increasing amount of floating cages in lake should be attend from goverment and local communities, so it is necessary to manage the use of lake for fish cultivation. Pattern of lake utilization for fish farming  based- community ist recommended to issue a business licence, in order to control fish farming activity, and not damage the environment, using growt out pattern by double nets so that more efficient operating cost and fish production can be increased, making management of feed in fish farming at floating cage, develop capability of human resouces, activate again POKDAKAN so coordination between farmers, goverment and stakeholder can be build and layout arrangement FNCC. Keywords : Lake utilization, carrying capacity,Teluk Lake, fish culture on floating cage,community based


2014 ◽  
Vol 2 (3) ◽  
pp. 209
Author(s):  
Naima Aktar ◽  
Abdus Salam Bhuiyan ◽  
M Nazrul Islam

This study was conducted on the 13 hatcheries of Rajshahi district from March to December 2013 to know about the fry production status, induced breeding practices and cost-profit status. Average fry production of Labeo rohita, 93.38±83.32 kg, Catla catla, 62.00±60.84 kg, Cirrhinus cirrhosus, 77.46±58.61 kg, L. calbasu, 14.20±14.60 kg, L. bata, 53.73±50.56 kg, L. gonia, 10.00±0 kg, Heteropneustes fossilis, 5.00±0 kg, Clarias batrachus, 20.00±0 kg, Hypophthalmichthys molitrix, 149.77±138.45 kg, Aristichthys nobilis, 104.54±148.11 kg, Ctenopharyngodon idella, 19.20±15.35 kg, Cyprinus carpio 108.08±77.39 kg and Barbonymus gonionotus, 23.10±14.04 kg were recorded in the surveyed hatcheries. Two types of hormone injections PG (pituitary gland) and HCG (Human chorionic gonadotropin) were used for induced breeding. The rate of 1st dose of injection of PG varied from 1 to 2 mg/kg and HCG from 100-150 IU/kg and the rate of 2nd dose of injection of PG varied between 5 and 8 mg/kg. The incubation period and hatching rate in different fish species varied from 10 to 72 hours and 55% to 80%, respectively. The average total cost, gross return and net profit of the hatcheries were 0.667±0.798, 1.152±1.636 and 0.485±0.846 million BDT respectively.


2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Mengya Cao

In recent years, the financial crisis has affected the economies of all countries in the world. At that time, it seriously restricted the development of the world economy. From a modern perspective, the difficult period of the world economic crisis caused by the financial crisis has passed, but the negative impact of the economic crisis can not be eliminated in a short time. Dispersed, the crisis has brought both opportunities and challenges to the country as well as heavy economic losses. Under the background of economic globalization, only by making a scientific and effective analysis of the world economic situation and keeping up with the trend of the world economy, can we effectively promote the domestic economic development and industrial structure, and enable our economy to develop healthily and substantially.


2020 ◽  
pp. 001-008
Author(s):  
Bhuyan Md. Simul

Halda is a unique resourceful tidal river of Bangladesh, where Indian major carps (Catla catla, Labeo rohita, Cirhinnus mrigala, and Labeo calbasu) spawn from April to June. Ecological conditions are auspicious from time immemorial which serves as a natural breeding ground in the world. The present study was conducted over the period of January-June 2017 to identify the main species of Zooplankton fauna and also fi nd out the dominancy of the highest plankton groups in the lower Halda River. A total of 3 major zooplankton groups-Copepoda, Rotifera and Cladocera were identifi ed during the six months period. A total of 35 species under 4 family showing the dominancy for the class Rotifera consisting of 7 genera were recorded from fi ve sampling sites. The lowest group was Cladocera consisting of 5 genera. The composition and dominance of the zooplankton community among fi ve different sites in the lower Halda River showed some close inter-relationships. The present study suggests for conducting further research to know the overall conditions and to make a complete list of available zooplankton fauna that exert impact on the water quality of the Halda River.


1986 ◽  
Vol 1 (3) ◽  
pp. 127-130 ◽  
Author(s):  
Gerald Schroeder

AbstractIn much of the developing world, the high cost of purchased feeds makes meat and milk too expensive to be consumed by the producers' own families. A fish pond integrated with livestock or crop production provides an important source of animal protein for home consumption or sale. This protein involves almost no cash costs, since the needed nutrients and energy are supplied by crop residues, green manure, livestock manure and sunlight. Conversion of manure into animal flesh is possible because the anoxic sediments support a microbial flora similar to that of the rumen. Although integrated fish farming has been practiced for thousands of years in China, it has not yet been successfully adapted to all regions for which it potentially is applicable. A program in Wuxi, China brings together students and scientists from all over the world who are working towards that goal.


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