scholarly journals New records of the lancelet Branchiostoma lanceolatum in Scottish waters

2019 ◽  
Vol 27 (1) ◽  
pp. 32-35
Author(s):  
M. O’Reilly ◽  
S. Nowacki ◽  
M. Baptie ◽  
E. Gerrie ◽  
M. MacKenzie
Keyword(s):  
New Records ◽  
Fish Farm ◽  
Reference Sites ◽  
Fish Farms ◽  
Branchiostoma Lanceolatum

New records of the lancelet Branchiostoma lanceolatum from Scottish waters are presented. Most of the records originate from sublittoral monitoring around fish farms from Orkney, Shetland, the Western Isles, the Isles of Skye and Mull, but also from a distillery discharge in the Firth of Clyde and a plankton survey in the Sea of the Hebrides. Lancelets were recovered in sediment grab samples from 6 - 60 m depth. Some recent accounts of intertidal lancelets are also cited. The lancelets appear to prefer coarser sediments and in the fish farm surveys were found predominantly at reference sites, away from the immediate influence of farm deposition.

scholarly journals Development of a Hydropower Turbine Using Seawater from a Fish Farm

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 266
Author(s):  
Md Rakibuzzaman ◽  
Sang-Ho Suh ◽  
Hyoung-Ho Kim ◽  
Youngtae Ryu ◽  
Kyung Yup Kim
Keyword(s):  
Power Plants ◽  
Guide Vane ◽  
Cross Flow ◽  
Synchronous Generator ◽  
Fish Farm ◽  
Hydropower Plant ◽  
Fish Farms ◽  
Data Simulation ◽  
Small Hydropower ◽  
Hydropower Plants

Discharge water from fish farms is a clean, renewable, and abundant energy source that has been used to obtain renewable energy via small hydropower plants. Small hydropower plants may be installed at offshore fish farms where suitable water is obtained throughout the year. It is necessary to meet the challenges of developing small hydropower systems, including sustainability and turbine efficiency. The main objective of this study was to investigate the possibility of constructing a small hydropower plant and develop 100 kW class propeller-type turbines in a fish farm with a permanent magnet synchronous generator (PMSG). The turbine was optimized using a computer simulation, and an experiment was conducted to obtain performance data. Simulation results were then validated with experimental results. Results revealed that streamlining the designed shape of the guide vane reduced the flow separation and improved the efficiency of the turbine. Optimizing the shape of the runner vane decreased the flow rate, reducing the water power and increasing the efficiency by about 5.57%. Also, results revealed that tubular or cross-flow turbines could be suitable for use in fish farm power plants, and the generator used should be waterproofed to avoid exposure to seawater.

Feasibility of Repurposing Offshore Decommissioned Gas Rigs into Fish Farms

2021 ◽  
Author(s):  
Saptarshi Pal ◽  
Chengi Kuo
Keyword(s):  
North Sea ◽  
Net Present Value ◽  
Cost Benefit Analysis ◽  
Storage System ◽  
Artificial Reef ◽  
Cost Benefit ◽  
Fish Farm ◽  
Fish Feed ◽  
Offshore Platforms ◽  
Fish Farms

Abstract In the past 70 years the world has relied extensively for its energy needs based on hydrocarbons produced significantly offshore. In recent years many installations with fixed platforms and pipelines are reaching the end of their useful life and are required by law to be decommissioned and removed if an approved alternative use cannot be found. This process coincides with focus on decarbonization arising from global warming and climate change. The conventional way of decommissioning is to remove the structure and take it onshore for disposal. Such an activity costs around £28 million for smaller UKCS installations in the Southern North Sea. Possible alternative solutions include their use as a research-leisure complex and artificial reef. Such an approach would have less impact on the environment and it is therefore worthwhile to explore the feasibility of repurposing these decommissioned UKCS platforms. The paper begins by highlighting the background to UKCS offshore decommissioning and farming fish life-cycle. This is followed by a critical review of the three options of total and partial removals and leave-on-site. It is found that repurposing decommissioned platforms for aquaculture farm has not been given sufficient attention and thus offers scope for a project to explore the feasibility of such a solution. Existing offshore fish farming in various countries are examined before using a decision-making matrix to select the most suitable UKCS installation for conversion and this led to using a normally unattended gas platform for the case study. The focus for this paper is on design and operation of an unattended fish farm and its cost benefit analysis. The former covers fish cage selection, capacity calculation, fish handling procedures, fish feed characteristics, feed demand, designing feed logistics and storage system. The processing facilities are layout on two decks and power needs are generated using a hybrid system of diesel and Li-ion battery. The possibility of using renewable sources by connecting to wind energy grids was also considered. For the latter capital and operating expenditure, revenue generated and maintenance costs are estimated before performing net present value prediction of the profitability of the fish farm over 10 years with for example up to 8 cages and three discount rates. The main conclusions derived are: It is technically feasible to convert a decommissioned gas platform to a fish farm and the operation can be economic. However, liability transfer implications in a repurposed offshore decommissioned gas platforms to fish farms were not established to verify the project viability. The conversion of unattended offshore gas platforms in the UKCS to an automated offshore fish farm is a novel solution which has not been implemented in the North Sea before. The work will provide an economic and environmental friendly solution to decommissioning offshore platforms and provide with a possible profitable investment.

scholarly journals Understanding the Biogeochemical Impacts of Fish Farms Using a Benthic-Pelagic Model

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2384
Author(s):  
Evgeniy Yakushev ◽  
Philip Wallhead ◽  
Paul Renaud ◽  
Alisa Ilinskaya ◽  
Elizaveta Protsenko ◽  
...  
Keyword(s):  
Organic Matter ◽  
Transport Model ◽  
Ammonium Phosphate ◽  
Oxygen Depletion ◽  
Fish Farm ◽  
Transformation Model ◽  
Fish Farms ◽  
Spatial And Temporal Scales ◽  
Benthic Biogeochemistry ◽  
Farming Industry

Sustainable development of the salmon farming industry requires knowledge of the biogeochemical impacts of fish farm emissions. To investigate the spatial and temporal scales of farm impacts on the water column and benthic biogeochemistry, we coupled the C-N-P-Si-O-S-Mn-Fe transformation model BROM with a 2-dimensional benthic-pelagic transport model (2DBP), considering vertical and horizontal transport in the water and upper 5 cm of sediments along a 10 km transect centered on a fish farm. The 2DBP model was forced by hydrophysical model data for the Hardangerfjord in western Norway. Model simulations showed reasonable agreement with field data from the Hardangerfjord in August 2016 (correlations between the model and observations were significant for most variables, and model biases were mostly <35%). The model predicted significant impacts on seafloor biogeochemistry up to 1 km from the fish farm (e.g., increased organic matter in sediments, oxygen depletion in bottom water and sediments, denitrification, metal and sulfur reduction), as well as detectable decreases in oxygen and increases in ammonium, phosphate and organic matter in the surface water near to the fish farm.

Parasitological monitoring of fish farm factories

2016 ◽  
Vol 3 (1) ◽  
pp. 54-57 ◽  
Author(s):  
Наумова ◽  
A. Naumova ◽  
Наумова ◽  
A. Naumova
Keyword(s):  
Fish Farming ◽  
Ammonia Concentration ◽  
Parasite Fauna ◽  
Fish Farm ◽  
Anthropogenic Factors ◽  
Fish Farms ◽  
Processing Technologies ◽  
Fish Breeding ◽  
Causative Agents ◽  
Abiotic And Biotic Factors

Objective of research: to perform the parasitological monitoring we have to study the parasite fauna in fishes from different fish farm factories, calculate the index of similarity, estimate the influence of abiotic and biotic factors on the ecosystem of fish-breeding reservoirs. Materials and methods: parasitological monitoring of factory fish farms was conducted by the method of complete and incomplete parasitological examination taking into account the data obtained from various fish-breeding reservoirs. Results and discussion: the parasite fauna of cyprinid fishes is represented by 56 species, carriage of causative agents of parasitic diseases in fishes is detected. Index of similarity of parasite fauna in carps has been studied and typification of agricultural reservoirs carried out. Index of similarity between the parasite fauna in carp and herbivorous fish was 22–33 %, carp and rough fish - 18–30,7 %. Influence of abiotic (oxidability, reduction of oxygen and nitrogen ammonia concentration, mineralization) and biotic – anthropogenic factors (violation of processing technologies, veterinary and sanitary rules of fish transport and fish farming operations) on fish infestation with parasites was studied. The role of parasitological monitoring in prevention and elimination of fish diseases was shown.

Sanitation of fish farms and prevention of fish diseases by pond drying with the use of fish and grass rotation

2016 ◽  
Vol 3 (3) ◽  
pp. 380-384
Author(s):  
Наумова ◽  
A. Naumova ◽  
Наумова ◽  
A. Naumova
Keyword(s):  
Comparative Research ◽  
Silver Carp ◽  
Fish Farm ◽  
Fish Production ◽  
Fish Ponds ◽  
Fish Farms ◽  
Commercial Fish ◽  
Causative Agents ◽  
Annual Frequency ◽  
One Year

Objective of research: to present the actuality and novelty of application of fish and grass “rotation” because this allows to reveal new data on pond drainage planning which is the most effective in sanitation of the fish farm. Materials and methods: to determine the most effective cycle for the summer drying of ponds, we studied ecological and epizootological features of fishing ponds, which had been used after drying within 1 and 5 years. As research object served 8 fish ponds: 4 drained ponds under crop (40 ha), 4 — overflowed (40 ha) and filled with one-year carps (2,5-З thousand ind./ha) and silver carps (1,2-1,4 thousand ind./ha). Results and discussion: The results of comparative research on anti-epizootic efficacy of pond drying at different periodicity of 1 and 5 years with the use of fish and grass “rotation” are provided. Data on decreased invasion of fishes (carp, silver carp) by parasites, absence of causative agents of infection, improved blood indicators, increased fish production at annual pond drying (with the use of fish and grass “rotation”) compared with the pond drying of 5 year periodicity are presented. Advantages of economic efficacy of the annual frequency of pond drying are confirmed: twice increased commercial fish production; reduced expenses for purchase of food (own barley and wheat production), drugs, disinfectants, fertilizers that allow increasing economic revenue and making profit.

Occurrence of two novel actinospore types (Cnidaria: Myxosporea) in Brazilian fish farms, and the creation of a novel actinospore collective group, Seisactinomyxon

2017 ◽  
Vol 62 (1) ◽  
Author(s):  
Tiago Milanin ◽  
Stephen D. Atkinson ◽  
Márcia R.M. Silva ◽  
Roberto G. Alves ◽  
Antônio A.M. Maia ◽  
...  
Keyword(s):  
Fresh Water ◽  
Life Cycles ◽  
The State ◽  
Fish Farm ◽  
Fish Farms ◽  
Mato Grosso ◽  
Collective Group ◽  
The Creation ◽  
State 1 ◽  
Mato Grosso Do Sul

AbstractThe involvement of oligochaetes in the life cycles of fresh water myxozoan parasites in Brazil was investigated. Of 333 oligochaetes collected in a fish farm in the State of São Paulo, three (0.9%) released Aurantiactinomyxon type spores. From 86 worms collected in a fish farm in Mato Grosso do Sul State, 1 (0.9%) released actinospores with a novel morphology for which we propose the name Seisactinomyxon. Infected oligochaetes were identified by morphology: all belonged to family Naididae, with

scholarly journals AQUAM—A Decision Support Software for Fish Farm Management

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Marius Radulescu
Keyword(s):  
Decision Support ◽  
Fish Species ◽  
Fish Farm ◽  
Fish Growth ◽  
Fresh Water Fish ◽  
Fish Farms ◽  
Efficient Management ◽  
Short And Long Term ◽  
Support Software

In this paper, a software for management and decision support in a fish farm is presented. The software called AQUAM is dedicated to fresh water fish farms. Its aim is to make an efficient management of resources through planning, monitoring, analysis and decision support. Successful planning and management requires the integration of data related to ponds, fish species, fish growth, water and energy and economic analysis. AQUAM computes farm budgets relating various costs and returns in order to determine short and long term profitability. A simulation of the profit, as a function of the fish holding density, is performed with AQUAM. The data used in the simulation are from a fish farm of semi-intensive type, located in the region Danube Delta, at village Jurilovca, Tulcea county, Romania. The fish species that were taken into account were carp and sanger.

Computer vision and robotics techniques in fish farms

Robotica ◽  
2003 ◽  
Vol 21 (3) ◽  
pp. 233-243 ◽  
Author(s):  
J. R. Martinez-de Dios ◽  
C. Serna ◽  
A. Ollero
Keyword(s):  
Computer Vision ◽  
Stereo Vision ◽  
Low Cost ◽  
Fish Farm ◽  
Weight Estimation ◽  
Fish Farms ◽  
Fish Feeding ◽  
Fish Weight ◽  
Processing Algorithms ◽  
And Robotics

This paper presents new low-cost systems for the automation of some fish farm operations. Particularly, computer vision is applied to non-contact fish weight estimation. Stereo vision systems with synchronised convergent cameras are employed to perform fish 3-D segmentation in tanks and sea cages. Several pre-processing algorithms are applied to compensate for illumination local variations. The approach applied for fish 3-D segmentation consists in detecting in both images certain fish features. Once these points have been detected and validated in both images, the fish are 3-D segmented by applying stereo vision matching considerations. Fish weight is estimated by using simple length-weight relations well known in the aquaculture domain. The paper also briefly describes robotics systems for fish feeding and underwater pond cleaning, which can be also used to implement the above mentioned computer vision techniques for the fish estimation.

scholarly journals First record of Neoechinorhynchus buttnerae (Eoacantocephala, Neochinorhynchidae) on Colossoma macropomum (Characidae) in a fish farm in Roraima, Brazil

2018 ◽  
Vol 48 (1) ◽  
pp. 42-45 ◽  
Author(s):  
Jeffson Nobre PEREIRA ◽  
Germán Augusto Murrieta MOREY
Keyword(s):  
Condition Factor ◽  
First Record ◽  
Fish Farm ◽  
Fish Farms ◽  
Colossoma Macropomum ◽  
Relative Condition Factor ◽  
Severe Infections ◽  
Northern Brazil ◽  
Positive Correlations ◽  
First Time

ABSTRACT Severe infections by the acanthocephalan Neoechinorhynchus buttnerae were reported in Colossoma macropomum in fish farms in northern Brazil. The occurrence of the parasite is recorded for the first time in the state of Roraima, Brazil, along with its parasite indexes. Fifty C. macropomum from a fish farm were analyzed. We collected a total of 13474 individual parasites. Neoechinorhynchus buttnerae had a prevalence of 100%, and mean intensity and mean abundance of 269.48. Significant positive correlations were observed between fish standard length, weight and relative condition factor and the number of parasites. Our results showed evident loss of body mass in the parasitized fish. Fish farmers in Roraima should be advised to manage the infection of C. macropomum by N. buttnerae, as massive infections of this parasite can deteriorate the health of the fish.

scholarly journals Seasonality of parasitic helminths of Leporinus macrocephalus and their parasitism rates in farming systems in the Amazon

2017 ◽  
Vol 26 (4) ◽  
pp. 419-426 ◽  
Author(s):  
Williane Maria de Oliveira Martins ◽  
Márcia Cristina Nascimento Justo ◽  
Melissa Querido Cárdenas ◽  
Simone Chinicz Cohen
Keyword(s):  
Farming Systems ◽  
Farming System ◽  
Dry Season ◽  
Fish Farm ◽  
Fish Farms ◽  
Parasitic Helminths ◽  
Parasitism Rates ◽  
The Mean ◽  
Dry And Rainy Seasons ◽  
Parasite Dynamics

Abstract The objective of the present study was to analyze the seasonality of parasitic helminths of Leporinus macrocephalus from fish farms in the municipality of Cruzeiro do Sul, Acre, Brazil, and their parasitism rates. Between June 2014 and March 2015, 200 specimens were sampled from two fish farms: one with a semi-intensive system and the other with an extensive system (100 fish from each farm: 50 during the dry season and 50 during the rainy season). Fifteen species of parasites were found, with seasonal variations of some according to the farming system. In the semi-intensive fish farm, there was greater prevalence of infection during the dry season. Also, Urocleidoides paradoxus, Procamallanus (Spirocamallanus) inopinatus, Goezia leporini and Rhabdochona (Rhabdochona) acuminata presented differences in their parasitism rates between the seasons. In the extensive fish farm, no variation in the prevalence of infection was observed between the seasons and two species Tereancistrum parvus and G. leporini demonstrated differences only regarding the mean intensity of infection. The data presented here may help fish farmers to understand the parasite dynamics of L. macrocephalus in farming systems during the dry and rainy seasons in the state of Acre.

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