scholarly journals Sloshing in a rotating liquid inside a closed sea cage for fish farming

2021 ◽  
Vol 33 (3) ◽  
pp. 037114
Author(s):  
Andrei Tsarau ◽  
Claudio Lugni ◽  
Alessia Lucarelli ◽  
David Kristiansen ◽  
Pål Lader
Keyword(s):  
Fish Farming ◽  
Rotating Liquid ◽  
Sea Cage

scholarly journals Effect of production quotas on economic and environmental values of growth rate and feed efficiency in sea cage fish farming

PLoS ONE ◽  
2017 ◽  
Vol 12 (3) ◽  
pp. e0173131 ◽  
Author(s):  
M. Besson ◽  
I. J. M. de Boer ◽  
M. Vandeputte ◽  
J. A. M. van Arendonk ◽  
E. Quillet ◽  
...  
Keyword(s):  
Growth Rate ◽  
Feed Efficiency ◽  
Fish Farming ◽  
Environmental Values ◽  
Sea Cage ◽  
Cage Fish

scholarly journals Adoption of sea cage farming of cobia (Rachycentron canadum) by fishermen self-help groups as a diversified livelihood option: A success story from Ramanathapuram District, Tamil Nadu

2019 ◽  
Vol 66 (3) ◽  
Author(s):  
B. Johnson ◽  
A.K. Abdul Nazar ◽  
R. Jayakumar ◽  
R. Jayakumar ◽  
G. Tamilmani ◽  
...  
Keyword(s):  
Tamil Nadu ◽  
Fish Farming ◽  
Small Scale ◽  
Market Demand ◽  
Rachycentron Canadum ◽  
Self Help ◽  
Sea Cage ◽  
Self Help Groups ◽  
Pellet Feed ◽  
Fast Growth Rate

The ICAR-Central Marine Fisheries Research Institute (ICAR-CMFRI) is the pioneer in developing the technology for cage fish farming in India . Cobia (Rachycentron canadum) grows relatively fast in cages and is very much suited for carrying out small scale mariculture to meet the alternate livelihood needs of fisher-folk. Mandapam Regional Centre of ICAR-CMFRI has developed the technology for breeding, seed production and farming of cobia in cages and organised training, and frontline/participatory demonstration programmes which have aided in creating awareness about the techno-economic viability of cage farming among the fisherfolk in Ramanathapuram District, Tamil Nadu. A survey was taken up among a sample of 75 members of fisher self help groups (SHGs) who had adopted cage farming of cobia, inorder to assess their perception and attributes about the technology as well as the constraints faced by them. The study found that fast growth rate of cobia, shorter culture period, good farm gate price, high market demand, ease of farming near the seashore and seed availability were the important attributes which attracted the fishermen groups to take up the farming. The innovations introduced by the fishers in cage farming technology were also documented. Majority of the fishers stated, non-availability of seed during peak stocking season, high cost of pellet feed, fluctuating cost of low value fishes which are used as feed for cobia and poaching as major constraints in cage farming.

scholarly journals A pan-European valuation of the extent, causes and cost of escape events from sea cage fish farming

Aquaculture ◽  
2015 ◽  
Vol 436 ◽  
pp. 21-26 ◽  
Author(s):  
Dave Jackson ◽  
Alan Drumm ◽  
Sarah McEvoy ◽  
Østen Jensen ◽  
Diego Mendiola ◽  
...  
Keyword(s):  
Fish Farming ◽  
Sea Cage ◽  
Cage Fish

scholarly journals Evaluation of diving operations for fish cage farming in the Aegean Sea

2021 ◽  
Vol 38 (1) ◽  
pp. 31-41
Author(s):  
Gamze Akpınar ◽  
F. Ozan Düzbastılar
Keyword(s):  
Aegean Sea ◽  
Fish Farming ◽  
Work Conditions ◽  
Abnormal Behavior ◽  
Mooring Line ◽  
Fish Farms ◽  
Face To Face ◽  
Diving Accidents ◽  
Dead Fish ◽  
Sea Cage

Mariculture represents approximate 50 percent of global aquaculture production by weight. Fish cages, which consist simply HDPE frame, netting, and mooring system, in fish farming are key elements of sea cage aquaculture. Aquaculture divers are responsible for inspection and maintenance of the underwater structures such as nets, mooring line and anchor, removing dead fish, monitoring the abnormal behavior of fish, assistance harvesting of fish and other periodic underwater works in fish cage farms. In recent years, the demand for aquaculture divers has increased in fish cage farms in both northern and southern Aegean Sea with enhancement of fish production in mariculture. On the other hand, various problems (diving accidents, faulty diving operations, lack of training etc.) related to work conditions and legal regulations of aquaculture divers have emerged. In the study, with the questionnaire consisting of 49 questions, face to face surveys were performed with 162 aquaculture divers in fish farms around Muğla and İzmir provinces between February and May 2019. Results showed the presence that there are three main problems consisting of diving regulations for professional divers, the candidate diving system and diving education which may cause fatal accidents should be improved and revised urgently.

Impact of sea-cage fish farms on intertidal macrobenthic assemblages

2004 ◽  
Vol 84 (3) ◽  
pp. 665-668 ◽  
Author(s):  
A. Boyra ◽  
F.J.A. Nascimento ◽  
F. Tuya ◽  
P. Sanchez-Jerez ◽  
R.J. Haroun
Keyword(s):  
Algal Species ◽  
Fish Farming ◽  
Fish Farms ◽  
East Atlantic ◽  
Caulerpa Racemosa ◽  
Gran Canaria ◽  
Macrobenthic Assemblages ◽  
Anemonia Sulcata ◽  
Sea Cage ◽  
Cage Fish

The influence of two sea-cage fish farms at Gran Canaria Island (Canary Islands, central east Atlantic Ocean) on the intertidal macrobenthic assemblages was studied. Two controls and two impact locations were established at each farm. The composition and coverage of the macrobenthic assemblages were surveyed every three months using image processing analyses. Significant dissimilarities were found between control and impact locations at both sea-cage fish farms. The presence of: (1) algal species tolerant to pollution (Caulerpa racemosa and Corallina elongata); and (2) filter-feeding fauna (Anemonia sulcata) at impact locations, indicate that the fish farming activity is causing an effect on the surrounding intertidal macrobenthic assemblages of both sea-cage fish farms.

Antagonistic activity of Bacillus subtilis strains isolated from various sources

2018 ◽  
Vol 8 (2) ◽  
pp. 354-364
Author(s):  
A. N. Irkitova ◽  
A. V. Grebenshchikova ◽  
A. V. Matsyura
Keyword(s):  
Escherichia Coli ◽  
Bacillus Subtilis ◽  
Wild Strain ◽  
Fish Farming ◽  
Antagonistic Activity ◽  
Antagonistic Effect ◽  
E Coli ◽  
Long Period ◽  
Test Culture ◽  
Agar Media

<p>An important link in solving the problem of healthy food is the intensification of the livestock, poultry and fish farming, which is possible only in the adoption and rigorous implementation of the concept of rational feeding of animals. In the implementation of this concept required is the application of probiotic preparations. Currently, there is an increased interest in spore probiotics. In many ways, this can be explained by the fact that they use no vegetative forms of the bacilli and their spores. This property provides spore probiotics a number of advantages: they are not whimsical, easily could be selected, cultivated, and dried. Moreover, they are resistant to various factors and could remain viable during a long period. One of the most famous spore microorganisms, which are widely used in agriculture, is <em>Bacillus subtilis</em>. Among the requirements imposed to probiotic microorganisms is mandatory – antagonistic activity to pathogenic and conditional-pathogenic microflora. The article presents the results of the analysis of antagonistic activity of collection strains of <em>B. subtilis</em>, and strains isolated from commercial preparations. We studied the antagonistic activity on agar and liquid nutrient medias to trigger different antagonism mechanisms of <em>B. subtilis</em>. On agar media, we applied three diffusion methods: perpendicular bands, agar blocks, agar wells. We also applied the method of co-incubating the test culture (<em>Escherichia coli</em>) and the antagonist (or its supernatant) in the nutrient broth. Our results demonstrated that all our explored strains of <em>B. subtilis</em> have antimicrobial activity against a wild strain of <em>E. coli</em>, but to varying degrees. We identified strains of <em>B. subtilis</em> with the highest antagonistic effect that can be recommended for inclusion in microbial preparations for agriculture.</p><p><em><br /></em><em></em></p>

ROCKET ENGINE WITH CONTINUOUSLY ROTATING LIQUID-FILM DETONATION

2019 ◽  
Author(s):  
S.M. FROLOV ◽  
◽  
I.O. SHAMSHIN ◽  
V.S. AKSENOV ◽  
I.A. SADYKOV ◽  
...  
Keyword(s):  
Liquid Film ◽  
Rocket Engine ◽  
Rotating Liquid

Typical errors and violations of biotechnics of artificial breeding of pacific salmon

2020 ◽  
pp. 13-23
Author(s):  
Ekaterina Grinberg
Keyword(s):  
Production Process ◽  
Preventive Measures ◽  
Pacific Salmon ◽  
Fish Farming ◽  
Important Condition ◽  
The Third ◽  
Fish Breeding ◽  
Artificial Breeding ◽  
Strict Compliance

In two parts of the article, more than 70 errors and violations of the Biotechnics of artificial breeding of Pacific salmon in salmon hatcheries are collected and summarized, which lead to an immediate or delayed deterioration of the quality of reared fry and a decrease in their survival rate. Deviations from the biological basis of fish farming are shown and possible consequences of such errors or violations are predicted. In the first part of the article (#7,2020) there were General errors (throughout the entire fish-breeding process), as well as violations of Biotechnics during the work with producers, collecting eggs and preparing them for incubation, in the second part-violations of Biotechnics during the incubation of eggs, holding pre-larvae, rearing and release of young. Their correction, prevention or minimization of consequences will significantly improve the quality of sexual products and offspring from producers, increase the linear and weight gain of juveniles during rearing, improve the coefficient of feed payment, reduce the time of rearing, improve the epizootic situation by developing immunity in fry and mobilizing other protective reactions of their body, significantly reduce waste at all stages of the production process, increasing survival by 10–15%. In conclusion, it is noted that the first and most important condition for an efficient salmon hatchery is the creation of optimal environmental conditions at each stage of the production process. The second condition is strict compliance with the Biotechnics of artificial salmon breeding and the complex of veterinary and sanitary, fish-breeding and meliorative and therapeutic and preventive measures. The third is the availability of competent specialists who regularly improve their skills in accredited Universities to implement, control and manage the first two conditions.

Results of a comparative study of the use of fodder worms of two breeds for pool growing of young tilapy and clary catfish in the conditions of the Almaty

2020 ◽  
pp. 73-80
Author(s):  
Z. Bolatbekova ◽  
S. Assylbekova ◽  
B. Kulatayev ◽  
S. Koishybayeva ◽  
N. Bulavina
Keyword(s):  
Comparative Study ◽  
Biochemical Composition ◽  
Nutritional Value ◽  
Fish Farming ◽  
Biological Indicators ◽  
Comprehensive Analysis ◽  
Fish Feed ◽  
Fish Breeding ◽  
Breeding Zone ◽  
Improved Methods

The aryicle presents the results of a comparative study of the biochemical composition of earthworms of dendrobene and prospector rocks, the peculiarities of their cultivation and their use for feeding when growing juvenile tilapia and clary catfish. The experience of cultivating earthworms of two breeds using the improved methods of foreign authors is described. The results of a study of the biochemical composition of cultivated objects that determine their nutritional value for feeding fish are presented. The fish-breeding and biological indicators of juvenile tilapia and clary catfish, obtained during the cultivation of dendrobene and prospector in fish farming in the Almaty region (VI fish-breeding zone) during worm feeding, are analyzed. A comprehensive analysis of the studied indicators made it possible to assign a certain rating place to each worm breed in relation to its use as fish feed.

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