The Knowledge Level of the Fish Farm Owners Related to the Technical Recommendations on the foundations of Fish Farming in Rashed and Edko district – Behiera Governorate

This is a notice of retraction of the article: The evaluation of fish farming impact by nutrient content and chlorophyll A in Mala Lamljana bay, published in the Archives of Biological Sciences in 2013, Vol. 65, Issue 3. The Editor-in-Chief has been informed that the data in this article has already been published in the following article: Jelic Mrcelic G, Sliskovic M. The impact of fish cages on water quality in one fish farm in Croatia. Int Sci Index. 2010;4(8):775-8. Inspection of these articles has revealed the following: a significant part of the data in the article published in the Archives of Biological Sciences was published without proper cross-referencing to the data already published in the earlier paper. This issue was discussed with one of the two authors and it was mutually agreed to retract the article. Link to the retracted article <a href="http://dx.doi.org/10.2298/ABS1302567J">10.2298/ABS1302567J</a>

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Parasitological monitoring of fish farm factories

Russian Journal of Parasitology ◽

10.12737/18361 ◽

2016 ◽

Vol 3 (1) ◽

pp. 54-57 ◽

Cited By ~ 1

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.

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Seasonal occurrence of diseases in a recirculation system for salmonid fish in the Czech Republic

Acta Veterinaria Brno ◽

10.2754/avb201483030201 ◽

2014 ◽

Vol 83 (3) ◽

pp. 201-207 ◽

Cited By ~ 2

Author(s):

Miroslava Palíková ◽

Stanislav Navrátil ◽

Alois Čížek ◽

Zdeňka Soukupová ◽

Štěpán Lang ◽

...

Keyword(s):

Czech Republic ◽

Brook Trout ◽

Animal Husbandry ◽

Fish Farming ◽

Health Problems ◽

Fish Farm ◽

Salmonid Fish ◽

The Czech Republic ◽

Larval Stages ◽

Recirculation System

Aquaculture represents the fastest growing animal husbandry in many countries. However, higher intensity of fish farming can pose higher health hazards, too. We monitored the health status of fish from one fish farm in South Bohemia and discovered the main health problems in the breeding. For two years we examined a total of 224 specimens of brook trout (Salvelinus fontinalis), 126 specimens of hybrids (S. fontinalis×S. alpinus), 49 specimens of rainbow trout (Oncorhynchus mykiss) – all clinically healthy, and 100 clinically diseased or freshly dead fish. We registered skin erosions mainly in the caudal peduncle and tail fin. Two parasite species were identified (one protistIchthyophthirius multifiliisand one nematodeRaphidascaris acus) by parasitological examination. The epidemiological indicators ofI. multifiliiswere low. The prevalence of adultR. acuswas 0–86% with a maximum in June. From November, capsules with larval stages ofR. acusappeared in internal organs. Their highest intensity (200 pieces) and prevalence (100%) were detected in October. By microbiological examination of skin and gills, we identified changes in the density of bacterial population and its species composition dependent on water temperature and fish density. The most important problem on the monitored fish farm seems to be furunculosis of salmonid fish in all clinical forms, and the high intensity of larval stages ofR. acus. The originality of this study is based on the fact that the observed breeding employs the first Danish recirculation system in the Czech Republic and no recent information about health problems has been available.

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RICE FARMERS’ PERCEPTION AND KNOWLEDGE OF INTEGRATED RICE AND FISH FARMING IN SELECTED LOCAL GOVERNMENT AREAS OF KWARA STATE

Cercetari Agronomice in Moldova ◽

10.46909/cerce-2020-032 ◽

2021 ◽

Vol 53 (4) ◽

pp. 368-383

Author(s):

Deborah OLABODE ◽

Kemi OMOTESHO ◽

Oluwafemi OLABANJI ◽

Israel OGUNLADE ◽

Oluwatosin ADEBISI

Keyword(s):

Significant Relationship ◽

Fish Farming ◽

Structured Interview ◽

Sampling Procedure ◽

Descriptive Statistics ◽

Knowledge Level ◽

Positive Perception ◽

Interview Schedule ◽

Rice Farmers ◽

Cooperative Society

In spite of the numerous advantages associated with integrated rice and fish farming, deliberate adoption of this technique is still insignificant. This study examined rice farmers’ perception and knowledge of integrated rice and fish farming practice in Kwara State. A three-stage sampling procedure was used to select 149 rice farmers, while data was obtained through the use of a well-structured structured interview schedule. Data were analysed using descriptive statistics and the Pearson’s Product Moment Correlation (PPMC). The results show that 81.9% of the respondents were male with mean age of 38 years and an average of 14 years farming experience. Given the average mean score of 3.04 respondents had a positive perception of integrated rice and fish farming, while 63.8% of the respondents had moderate knowledge. Farmers’ identified high cost of irrigation materials (M.S.=2.59), poaching (M.S.=2.59), flooding (M.S.= 2.55) as major constraints to the practice of integrated rice and fish farming. Farmers’ perception had a significant relationship with knowledge of integrated rice and fish farming at p<0.05 level. Also, farmers’ age (r=0.300, p<0.000), level of education (r=0.287, p<0.000), farming experience (r=0.220, p<0.007), membership of cooperative society (r=0.176, p<0.032) and extension contact (r=0.204, p<0.013) had significant relationship with the knowledge level. The study concluded that the rice farmers had moderate knowledge and positive perception of integrated rice and fish farming. There is a need to provide incentives, such as irrigation facilities to farmers and provision of adequate training on integrated rice and fish farming in order to fully maximize the potentials therein.

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Minding the Gaps in Fish Welfare: The Untapped Potential of Fish Farm Workers

Journal of Agricultural and Environmental Ethics ◽

10.1007/s10806-021-09869-w ◽

2021 ◽

Vol 34 (5) ◽

Author(s):

Christian Medaas ◽

Marianne E. Lien ◽

Kristine Gismervik ◽

Tore S. Kristiansen ◽

Tonje Osmundsen ◽

...

Keyword(s):

Participant Observation ◽

Fish Farming ◽

Fish Farm ◽

Farm Workers ◽

Farmed Fish ◽

Fish Welfare ◽

Daily Work ◽

General Welfare ◽

A Site ◽

Sentient Beings

AbstractThe welfare of farmed fish is often regarded with less concern than the welfare of other husbandry animals, as fish are not universally classified as sentient beings. In Norway, farmed fish and other husbandry animals are legally protected under the same laws. Additionally, the legislature has defined a number of aquaculture-specific amendments, including mandatory welfare courses for fish farmers who have a key role in securing animal welfare, also with regards to noting welfare challenges in the production process. This article uses fish welfare courses as a site from which to inquire about the common-sense understanding of fish welfare in Norwegian fish farming. The focus is specifically on fish farm employees, their experiences of welfare-related issues and contradictions in their daily work, and the struggle to act responsibly in aquaculture settings. Through participant observation at welfare courses, as well as interviews and conversations with fish farm workers, the article details how challenges are experienced ‘on the ground’, and suggests how fish farm workers’ own experiential knowledge might be mobilized to improve the general welfare of farmed fish.

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Hydrodynamic Response Analysis of Combined Spar Wind Turbine and Fish Cage for Offshore Fish Farms

International Journal of Structural Stability and Dynamics ◽

10.1142/s0219455420501047 ◽

2020 ◽

Vol 20 (09) ◽

pp. 2050104

Author(s):

Y. I. Chu ◽

C. M. Wang

Keyword(s):

Wind Turbine ◽

Frequency Domain ◽

Time Domain ◽

Fish Farming ◽

Fish Farm ◽

Constant Current ◽

Response Analysis ◽

Comparison Study ◽

Mooring Lines ◽

Hydrodynamic Response

This paper is concerned with the hydrodynamic response of a novel offshore fish farm that combines a floating spar wind turbine and a fish cage (named as COSPAR for brevity). The open net steel cage is octagonal in shape with a partially porous wave fence at its top end to attenuate wave energy for a calm fish farming environment as well as to keep predators out. The deep draught spar is made from concrete for its bottom half and from steel for its top half. The spar carries a control unit and a 1[Formula: see text]MW wind turbine that provides the required power to operate the offshore salmon fish farm. The COSPAR fish cage has four catenary chains as mooring lines attached to mid length of the spar (outside the fish cage) so as to mitigate tension force in the mooring lines and to reduce the benthic footprint. ANSYS Design Modeler and Aqwa are used to perform the hydrodynamic response analysis of free-floating condition of COSPAR in the frequency domain and coupled analysis involving COSPAR and the mooring lines in the frequency domain and time domain. Environmental conditions, representing 5-year, 20-year and 50-year wave return periods with a constant current flow at an exposed fish farming site in Storm Bay of Tasmania, Australia, are adopted for the analyses. A comparison study is made against having a floating fish cage only (i.e. without the bottom half concrete of the spar) with four catenary chains attached to side vertical columns of the cage so that the fish cage behaves like a semi-submersible cage. Based on the comparison study, the COSPAR fish cage shows enhanced hydrodynamic responses in the following respects: (1) more stable motion responses in heave and pitch against wave and current forces, (2) less susceptible to the viscous damping when it is assumed by a linearized drag force of Morison elements in the frequency domain and (3) reduction of tension forces in the mooring lines. Interestingly, the pitch motion response of COSPAR fish cage in the frequency domain is in close agreement with the time domain result due to its greater pitching stiffness that reduces nonlinear effects from viscous drag and mooring interaction.

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Productivity of the hired and family labour and determinants of technical inefficiency in Ghana’s fish farms

Agricultural Economics (Zemědělská ekonomika) ◽

10.17221/38/2009-agricecon ◽

2010 ◽

Vol 56 (No. 2) ◽

pp. 79-88 ◽

Cited By ~ 2

Author(s):

E.E. Onumah ◽

B. Brümmer ◽

G. Hörstgen-Schwark

Keyword(s):

Stochastic Frontier ◽

Fish Farming ◽

Fish Farm ◽

Fish Farms ◽

Cross Sectional ◽

Technical Inefficiency ◽

Farm Production ◽

Pond Type ◽

Frontier Production Function ◽

Enhancing Production

This paper examines the productivity of hired and family labour and determinants of technical inefficiency of fish farms in Ghana. A modified Cobb-Douglas stochastic frontier production function which accounts for zero usage of family and hired labour is employed on cross-sectional data of 150 farmers collected in 2007. The results reveal that family labour, hired labour, feed, seed, land, other costs and extension visit have a reasserting influence on fish farm production. Findings also show that family and hired labour used for fish farming production in Ghana may be equally productive. The combined effects of operational and farm specific factors (age, experience, land, gender, pond type and education) influence technical inefficiency although individual effects of some variables may not be significant. Mean technical efficiency is estimated to be 79 percent. Given the present state of technology and input level, the possibility of enhancing production can be achieved by reducing technical inefficiency by 21 percent through adoption of practices of the best fish farm.

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Enhancement of Design Criteria for Fish Farm Facilities Including Operations

24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 2 ◽

10.1115/omae2005-67451 ◽

2005 ◽

Cited By ~ 4

Author(s):

Are Johan Berstad ◽

Harald Tronstad ◽

Stein-Arne Sivertsen ◽

Endre Leite

Keyword(s):

Research Work ◽

Fish Farming ◽

Fish Farm ◽

Design Criteria ◽

Mooring System ◽

Fish Farms ◽

Safety Level ◽

Operational Conditions ◽

Farming Industry

A Norwegian Standard NS 9415 (NAS, 2003) has been introduced to the offshore fish farming industry in Norway. This is the first standard dealing with offshore fish farm facilities. The main objective of the standard is to reduce environmental pollution by fish escape. The work process leading to NS 9415 revealed the need for research work in several areas to enhance design criteria with the objective of having a consistent safety level through out the life cycle of a fish farm facility. This paper presents results from a government supported research project with the objective of enhancing criteria for design and operation of fish farm facilities. A case study of a fish farm facility representative for the majority of polyethylene based fish farms in Norway is presented and the sensitivity of such fish farms to variation in the mooring system is shown and discussed for design relevance. The sensitivity of net cage volume to current and weights is presented and discussed. Possible hazards from operational conditions are listed.

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Pond fish culture and needs for credit: A study in selected areas of Tangail district

Journal of the Bangladesh Agricultural University ◽

10.3329/jbau.v13i1.28727 ◽

2016 ◽

Vol 13 (1) ◽

pp. 117-124

Author(s):

MA Rahman ◽

F Ahmed ◽

MS Islam ◽

MA Khan

Keyword(s):

Fish Farming ◽

Fish Farm ◽

Small Scale ◽

Fish Production ◽

Gross Margin ◽

Feed Cost ◽

Human Labour ◽

High Feed ◽

Utilization Patterns ◽

One Year

This study examines the cost, returns, profitability of pond fish farm, requirements, adequacy, sources and utilization patterns of credit and problems associated with pond fish farming in Madhupur Upazila of Tangail district. A total of 60 farmers with small traditional types of ponds were randomly selected for this study. Both description and econometric analysis were used. Human labour was the most important and one of the largest inputs used for pond fish production. The average per acre human labour cost, fingerlings cost, feed cost, chemical fertilizers cost, manure cost, and lime cost were Tk. 9345, Tk. 18506, Tk.10476, Tk.3759, Tk. 329, and Tk.1605, respectively. Pond rental value was calculated at Tk. 11537 per acre for one year which shared 26.42 percent of total costs of pond fish production. Gross return was Tk. 70928 per acre. Gross margin and net return of the pond fish farm were Tk.38118 and Tk. 24081 per acre respectively. The BCR was 1.514. Out of 60 farmers, only 11 farmers received loans from different sources and 86.67 percent of applied amount received. About 83 percent of the loan used for operating expenditure of farming and rest 17 percent loan used for non-farm expenditure. There were some problems in fish farming, such as insufficient water, high feed cost etc. Government needs to provide subsidized feed, technical supports and credit facilities for the small scale fish farmers.J. Bangladesh Agril. Univ. 13(1): 117-124, June 2015

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Mollusk Shell Debris Accumulation in the Seabed Derived from Coastal Fish Farming

Journal of Marine Science and Engineering ◽

10.3390/jmse7100335 ◽

2019 ◽

Vol 7 (10) ◽

pp. 335 ◽

Cited By ~ 1

Author(s):

Pablo Sanchez-Jerez ◽

Lotte Krüger ◽

Nuria Casado-Coy ◽

Carlos Valle ◽

Carlos Sanz-Lazaro

Keyword(s):

Fish Farming ◽

Western Mediterranean ◽

Fish Farm ◽

The Other ◽

Fish Farms ◽

Debris Accumulation ◽

Zone Of Influence ◽

The One ◽

Underwater Camera

Fish farm facilities become colonized by biofouling, and in situ cleaning activities may increase the accumulation of biofouling, mostly shell-hash, on the sediment. However, there is a lack of knowledge about the effect of fish farming on this process. We evaluated the effect of fish farming on shell-hash accumulation on sediments in three fish farms in the Western Mediterranean in Spain. On the one hand, coverage of non-degraded shell on the seabed was estimated using an underwater camera attached to a frame of 1 × 1 m. On the other hand, superficial sediment samples were taken by a Van-Veen grab, and from a subsample, shell-hash was sorted at the laboratory, dried, and weighted. A significant increase of shells on sediment was detected under fish farms compared with the other treatments, with average values of 53 g kg-1, and 1.12% of cover. Shell-hash at zones close to the fish farm cages (Zone of Influence located between 40 to 60 m from the closest cage) did not show statistical differences compared to the reference zones, 300–500 m away from the concession limits, but the shell cover showed statistical differences. Fish farming activities produce a local increase in the sedimentation rate of shells under the cages. The derived ecological consequences of this accumulation need to be further studied.

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