Wyniki wyszukiwania - Biblioteka Nauki

1

Risk management in the Greek mussel farming through ISO 31000

100%

Theodorou J. A. , Tzovenis I.

Oceanological and Hydrobiological Studies

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2024

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tom Vol. 53, No. 1

79--87

EN

The main risks to the sustainability of Mediterranean mussel farming in Greece were assessed using a generic framework derived from the AS/NZS ISO 31000:2009 Risk Management Model. Risk management scenarios were reviewed after they were successfully tested in the field by semi-qualitative/quantitative data generation protocols. A critical synthesis of the results identifies key indicative aspects needed by stakeholders to formulate a valid operational risk management plan for the sector.

2

Economic significance of the sea fisheries and aquaculture industries

100%

Berkowska E.

Zeszyty Prawnicze BAS

|

2023

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nr 2(78)

203-207

EN

The article focuses on the analysis of the importance of fisheries and aquaculture to Poland’s economy. The article presents statistics on the value, employment and budget allocated to fisheries and aquaculture.

3

Incidence of skeletal deformities in induced triploid rainbow trout Oncorhynchus mykiss (Walbaum, 1792)

100%

Jagiełło K. , Polonis M. , Ocalewicz K.

Oceanological and Hydrobiological Studies

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2021

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tom Vol. 50, No. 2

150--159

EN

Due to the cytogenetic incompatibility, triploid fish are usually infertile and are not affected by a decline in growth, survival and meat quality, which accompanies the process of sexual maturation in diploid specimens. Thus, artificial triploidization has been proposed for fish production in the case of species with early sexual maturation, such as rainbow trout. However, the use of this technique is limited by increased ratios of skeletal deformities observed in triploid specimens. The main objective of this research was to compare the proportion and variety of body abnormalities in diploid and triploid 14-month-old rainbow trout from commercial stocks, using external body shape examination, radiography and whole-mount skeletal staining. Individuals with externally observed body deformities (scoliosis, humpback, shortened tail and jaw deformities) accounted for 0.45% of the diploid stock and 3.83% of the triploid stock. X-rays and whole-mount skeletal staining of deformed individuals showed spine deformities, including compressions and fusions of vertebrae. Abnormalities observed in diploid and triploid rainbow trout examined during this study were non-lethal, however, they may negatively affect the condition of fish. Fish with skeletal deformities are not aesthetically pleasing, thus an increased ratio of such deformations in fish produced for commercial purposes may result in real economic losses.

4

Empirical approach to risk management strategies of Mediterranean mussel farmers in Greece

100%

Theodorou J. A. , Tzovenis I. , Katselis G.

Oceanological and Hydrobiological Studies

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2021

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tom Vol. 50, No. 4

455--472

EN

Risk perception and risk responses of Greek mussel farmers are important for understanding their risk behavior and the likely success of different risk mitigation strategies. This allows policy makers and actuarial companies to decide what risk management products to offer to address specific types of risks. Results from an empirical survey showed that ex-farm prices and health/disability status of farmers are perceived as the most important sources of risk. Risk management decisions were strongly influenced by the attitudes of mussel farmers rather than their socioeconomic status or perception of risk sources. Financial reserves and an alternative source of stable income are both preferred by mussel farmers as risk management strategies, while optimizing farm management to produce at the lowest possible cost is commonly practiced to eliminate losses. Farmers recommend that for certain types of risks that lead to total losses, e.g. anoxia, tsunamis, harmful algal blooms (HABs), insurance contracts should be provided by the public sector, as in similar situations in agriculture. For other needs, customized insurance contracts should be provided by the actuarial market.

5

Implementation of an Integrated Floating Wetland and Biofilter for Water Treatment in Nile Tilapia Aquaculture

100%

Somprasert S. , Mungkung S. , Kreetachat N. , Imman S. , Homklin S.

Journal of Ecological Engineering

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2021

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tom Vol. 22, nr 8

146--152

EN

Due to the high nutrient and organic matter contents of fish pond water, the water must be treated before disposal to prevent the eutrophication and deterioration of natural receiving waters. Floating wetlands (FTWs) and biofilters are environmentally friendly ecological treatments that can be used for this water. Thus, this study aimed to investigate the performance of FTWs with biofilters (FTW/Bs) for nutrient and organic compound removal. Two FTW/ Bs were applied in a pond with 5,000 Nile tilapia. The macrophyte species in the FTWs were Cyperus (Cyperus spp.) and Heliconia (Heliconia spp.). The buoyant mats of the FTWs were made from bamboo, and 200 bioballs were loaded below the mats. The water quality parameters in the pond were monitored for 5 weeks between the control test without the FTW/Bs and the experimental test with FTW/Bs at sites 1 (S1) to 8 (S8). The FTW/Bs were located at sites 2 (S2) and 3 (S3). The results showed reductions in all water quality parameters except orthophosphate (ortho-P) at S2 and S3. The COD, BOD, NH4-N, and SS at S2 and S3 parameters during the experimental test were significantly lower than those during the control test, in the ranges of 20.34–33.96, 25.47–29.41, 25.86–27.87, and 26.00–28.44%, respectively.

6

The effect of lead on photosynthetic apparatus of maize cultivated in aquacultures

100%

Jasiewicz C. , Zemanek M. , Antonkiewicz J.

Polish Journal of Natural Sciences. Supplement

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2003

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tom 01

7

Biotechnological bases of organization of industrial crayfish farm in Ukraine

88%

Marenkov O.

World News of Natural Sciences

|

2020

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tom 28

1-12

EN

Crayfish are valuable invertebrates that are constantly in great demand in all corners of the Earth. Breeding crayfish is not only large-scale production as it can also be arranged in small volumes using pools and installations of closed water supply. Cultivation of crayfish generates profit after a certain period of time, if all biotechnological norms of cultivation are considered. Cultivation of crayfish is a rather promising production, in which it is possible to obtain from 200 to 300% of stable profits during 3–4 years old. The article gives an overview of the technology of growing crayfish, taking into account the characteristics of farming in Ukraine. The basic biotechnological stages of the establishment and operation of the economy are determined, calculations of capital expenditures for the establishment of the economy are presented and the profitability of the project for the production of freshwater crayfish is determined. Cultivation of river crayfish makes it possible to obtain environmentally friendly products that can compete on the markets of Ukraine or EU countries. Also, this way of growing crayfish allows getting stocking material for release in natural reservoirs in order to restore the populations of river crayfish.

8

Emergence of Antibiotic Resistance Genes sul1, tetA, blaGES, and mexF in Sapon Irrigation Canal and Aquaculture Pond in Kulon Progo Regency, Indonesia

88%

Ikhrami M. A. , Sari D. W. K. , Putra M. M. P.

Journal of Ecological Engineering

|

2024

|

tom Vol. 25, nr 2

85--92

EN

Antibiotic resistance genes (ARGs) have recently become an emerging environmental contaminants. The aquatic environment, such as a river has already become the most polluted environment and can be a driver of ARGs. The water from irrigation canal has the potential to become a hotspot of ARGs through contamination from river pollutants carried along to the irrigation canal. However, the information regarding the cross-contamination of ARGs in fish farming systems integrated with irrigation canal in Indonesia needs further study. This study investigated the occurrence of ARGs sulfonamide (sul1), tetracycline (tetA), beta lactam (blaGES), and multi drug resistance (mexF) from body water samples along the irrigation canal and aquaculture ponds which utilize irrigation water for cultivation. Sampling sites are located in the Kulon Progo Regency (Indonesia) and samples were taken during the rainy season. Gene amplification was performed using Multiplex PCR. The results showed that sul1, tetA, and blaGES were detected in 67%, 63%, and 55% of all samples. Meanwhile, mexF was only found upstream and downstream irrigation canals, which accounted for 25% of the total samples. The results of this study indicated that the Sapon Irrigation Canal has the potential to cause the spread of antibiotic resistance genes.

9

Phytoplankton Community Stability as a Health Indicator of Whiteleg Shrimp in an Intensive Pond

88%

Musa M. , Mahmudi M. , Lusiana E. D. , Buwono N. R. , Arsad S.

Ecological Engineering & Environmental Technology

|

2024

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tom Vol. 25, iss. 1

332--340

EN

The goal of this study was to examine and assess the stability of phytoplankton communities in connection to the different health status type of shrimp pond (healthy and diseased) in an intensive culture. The research was conducted in two ponds located in Probolinggo region, which had different health status until the eight week of harvest period. Several water quality variables and phytoplankton community composition were observed. Non-metric dimensional scaling and analysis of similarity were used to compare the phytoplankton community structure and water quality parameters in both ponds. In addition, the stability of phytoplankton community in these ponds was measured using species turnover rate, rate change of composition community, and community stability indices. The results showed that phytoplankton community structure and water quality factors between a diseased and healthy pond were not statistically significant. On the other hand, the phytoplankton community in the healthy pond was more stable than that of the diseased pond. Furthermore, ammonia and phosphate were found as the dominant factors affecting the phytoplankton community in the studied ponds.

10

Intensyfikacja procesu odwadniania osadów z pstrągowych gospodarstw rybackich

88%

Rynkiewicz M. R. , Kisielewska M.

Rocznik Ochrona Środowiska

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2013

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tom Tom 15, cz. 3

2279--2292

EN

Impurities which are produced in the process of intensive fish breeding usually accumulate at the bottom of ponds and pools where the fattening is conducted, resulting in sludge rich in organic matter and biogenic elements. The sludge, consisting mainly of fish faeces and the fodder uneaten by the fish, accumulates in special zones intended for this purpose. As the experiment shows, the ability of the sludge to yield water is very poor and the sludge should be classed as poorly dewatering. Therefore, before it was dewatered in a laboratory the sludge was conditioned with inorganic compounds and cationic polyelectrolytes in order to facilitate the process. The inorganic compounds used for conditioning were: technical grade iron (III) sulphate – trade name “PIX 113”, aluminum sulphate and calcium oxide. The sludge was dewatered in a reduced pressure device, equipped with a Büchner funnel, which enables the determination of the specific resistance. The collected sludge contained variable amounts of dry matter and organic matter. The study presents the results of determination of the specific resistance, final dewatering of sludge and its content of organic matter, depending on the type and amount of the conditioning agent applied. The results also allowed the determination of the doses which optimally facilitate the dewatering process and reduce the degree of sludge hydration. The process effectiveness was found to be dependent mainly on organic matter content in sludge. It was also found that the specific resistance was most reduced by cationic polyelectrolytes, while the final hydration was the lowest when calcium oxide was used. The determined optimal doses depended on organic matter content and ranged: for iron sulphate from 0.7 to 15% (d.m.), for aluminum sulphate from 0.6 to 15% (d.m.), for calcium oxide from 7 to 30% (d.m.), for cationic polyelectrolytes from 0.064 to 0.19% (d.m.) of sludge. No statistically significant differences were found in dewatering effectiveness between iron sulphate and aluminium sulphate.

11

Can multiple fish farms be integrated within a semi-enclosed bay without causing acute ecosystem degradation?

88%

Puhr K. , Pikelj K. , Fiket Ž.

Oceanologia

|

2017

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tom No. 59 (3)

318--330

EN

The current study explores the possibility that multiple fish farms (FFs) containing sea bass (Dicentrarchus labrax) and sea bream (Sparus aurata) can be successfully integrated within a semi-enclosed bay in the Croatian Adriatic. The research focuses on determining principal environmental factors (EFs) that control the integration and attempts to estimate their individual and synergic ability to influence deposition and removal of organic matter (OM) and trace elements (TE) from the system. The complexity of the designated tasks demanded a comprehensive number of various datasets and samples to be used in the analysis. The ADCP data revealed strong wind induced currents forming within the research domain resulting in high system flushing efficiency (3.5–6 days). The sediment samples from all stations contained relatively inert minerals which contributed to overall low OM and TE concentrations and very limited variability found across the entire bathymetric range. The thermal advection effect recorded at two stations was attributed to specific seabed topography and the hydrodynamic response formed during Maestral wind episodes. The results indicate that a successful integration of four FFs has taken place within the research site (semi enclosed bay), and that the key EFs responsible for its success are strong wind induced hydrodynamics, favorable seabed topography and sediment mineral composition. The synergy of the principal EFs that formed within the system was found to have an attenuating effect regarding FFs chemical influence (OM and TE) and an amplifying one regarding spatial footprint which extended to ≈2000 m distance.

12

Organic Micropollutants from an Agricultural Drainage Ditch Contaminate a Shrimp Farm in Sinaloa (Mexico)

75%

Moeder M. , Carranza-Diaz O. , López-Angulo G. , Ahumada-Santos Y. P. , Schrader S. , Reemtsma T. , Delgado-Vargas F.

Journal of Ecological Engineering

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2023

|

tom Vol. 24, nr 3

143--152

EN

Among nutrients and pesticides, agricultural draining ditches also transport pollutants discharged with untreated wastewater from the municipalities adjoining the ditch. When the ditch water is used for irrigation and aquaculture, risks for the environment and food production are suggested. For the conducted field study, a shrimp farm in Sinaloa (Mexico) was used to trace organic pollutants (pesticides and pharmaceutical residues) on their way from an agricultural draining ditch to a shrimp farm fed partially by the drain water. The concentrations of pollutants in the drain water ranged from 10 ng L-1 to 453 ng L-1. The pond water of the shrimp farm contained concentrations between <10 ng L-1 and 177 ng L-1. The shrimps were contaminated by pollutants at concentrations between 40 μg kg-1 d.w. (dry weight) to 3.3 mg kg-1 d.w. (fungicide Metalaxyl). Health risks for the cultivated shrimps cannot be excluded because some pesticides are known for their toxic effects to crustaceans. The concentrations of selected antibiotics in the shrimps were low and comparable with those found in the shrimps declared as seawater shrimps from a German supermarket. The incorporation of the antibiotics was probably caused by contact to the wastewater in the shrimp ponds and/or by contaminated shrimp feed. Additionally to the anthropogenic chemicals, coliforms were determined in the water (total coliforms: 30-50 CFU 100 mL-1; fecal coliforms: 0-20 CFU 100 mL-1). These values agree with the Mexican Norm NOM-242-SSA1-2009 representing a microbiological quality of water adequate for aquaculture. The number of coliforms measured in shrimp was higher than in pond water, suggesting bioaccumulation and a potential health risk for consumers.

13

Effects of diet quantity on growth performance of juvenile sea cucumbers Holothuria scabra

75%

Al-Harbi M.

Oceanological and Hydrobiological Studies

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2022

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tom Vol. 51, No. 2

158--166

EN

Sea cucumbers are in high demand in the world market due to their nutritional and medicinal values. In this study, the growth performance of juvenile sea cucumbers Holothuria scabra fed with different proportions of two feeds was analyzed. Commercially available sea cucumber feed (feed-A) and formulated feed (feed-B) were used for the experiments. Animals fed with 2% feed-A showed a negative growth rate. Maximum growth was observed in animals fed with 8% feed-A and feed-B. While feed-A treated groups showed significant variation (P < 0.05) in growth performance between different percentages of diets, feed-B treated animals showed no such variation. Feed-B treated animals showed higher growth rates compared to feed-A treated sea cucumbers. Water quality parameters and anoxic conditions of the soil in culture tanks did not change due to the higher percentage of feeds. In conclusion, this study showed that diet percentage is an important factor for the optimum growth of sea cucumbers.

14

Scale-dependent environmental control of mesozooplankton community structure in three aquaculture subtropical bays of China

75%

Sun D. , Liu Z. , Wang C.

Oceanologia

|

2016

|

tom 58

|

nr 2

15

Assessment of a sheltered euhaline area of the Southeastern Bay of Biscay to sustain bivalve production in terms of phytoplankton community composition

75%

Bilbao J. , Muniz O. , Rodriguez J. G. , Revilla M. , Laza-Matinez A. , Seoane S.

Oceanologia

|

2021

|

tom 63

|

nr 1

16

Accumulation of manganese in selected links of food chains in aquatic ecosystems

75%

Niemiec M. , Wisniowska-Kielian B.

Journal of Elementology

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2015

|

tom 20

|

nr 4

EN

The accumulation of elements in biocenoses of aquatic ecosystems depends primarily on the forms of elements in the environment. The bioaccumulation coefficient (BC) is a measure of the intensity of an elements uptake of trace by living organisms. Manganese is an essential element for both plant and animal organisms. However, its excess may cause a toxic effect, i.e. it disturbs the activity of synapses, thus leading to an impaired functioning of the central nervous system. This study focused on the accumulation of manganese in individual links of an aquatic ecosystem food chain under conditions of extensive carp farming. The BC values were computed and the pollution degree of the fish pond was estimated. The investigations were conducted in a fish pond situated in Mydlniki and fed with water from the Rudawa River. Water, bottom sediment, benthic organisms (Diptera Chironomidae larvae) and carps were sampled from the pond. Organs most strongly involved in the metal metabolism (gills, gonads, liver and muscles) were prepared from sampled carps. Manganese concentrations were determined in all samples using atomic emission spectroscopy after wet mineralization of samples in a closed system in a microwave mineralizer. The concentrations of manganese in the abiotic elements of pond ecosystems were low and should not pose any threat of its excessive accumulation in living organisms. However, the manganese concentrations in the benthic organisms and in the analyzed carp organs were high. Similarly, other authors found high manganese concentration in fish living in the environments polluted with this element. The value of manganese enrichment coefficient for the bottom sediments in relation to its water concentration was high. The biggest manganese content was assessed in gills, then in the liver and gonads, and the smallest one - in carp muscles. Manganese BCs in the gills of carps in relation to its content in water and bottom sediments were 176.6 and 0.08, respectively. The BC values in relation to the manganese concentration in water were much higher, but lower in comparison to its content in bottom sediments than reported elsewhere. This confirms that the BC for manganese in gills varies depending on the water pollution level.

17

Nutrient Absorption and Biomass Production by the Marine Diatom Chaetoceros Muelleri: Effects of Temperature, Salinity, Photoperiod, and Light Intensity

75%

Minggat E. , Roseli W. , Tanaka Y.

Journal of Ecological Engineering

|

2021

|

tom Vol. 22, nr 1

231--240

EN

The marine diatom Chaetoceros muelleri is commonly used for aquacultural feed and is well known for its fast growth and easy maintenance. In order to evaluate the potential of C. muelleri to be used for the nutrient removal and biomass production from eutrophic saline wastewaters, the algae were cultured under a wide range of temperature, salinity, photoperiod, and light intensity. The optimum temperature for the biomass production was observed at 30°C, but the algae could maintain at least 66% of the highest production between 20°C and 35°C. The optimum salinity for the biomass production was 25, but the algae could maintain at least 22% of the highest production between 10 and 30. Both light intensity and photoperiod affected the algal biomass production, and the minimum light requirement was considered 100 μmol m−2•s−1 for 6 hours to maintain the biomass production and nitrogen (N) and phosphorus (P) absorption. Throughout all the experiments, the N and P absorption increased with the biomass production, but the ratio of N and P to the biomass exponentially decreased with the biomass production. These results showed that C. muelleri is tolerant to the wide range of environmental conditions, absorbing nutrients and producing organic matter. C. muelleri has a great potential to be introduced in the water treatment processes, especially where the temperature and salinity fluctuate.

18

Jakość i innowacje systemy recyrkulacyjne w akwakulturze

75%

Borowski P. F. , Zalewski W.

Przemysł Spożywczy

|

2014

|

tom T. 68, nr 3

26--27

PL

Artykuł omawia zagadnienia związane z innowacyjnymi rozwiązaniami stosowanymi w akwakulturze. Wdrożenie systemu recyrkulacji pozwala na zwiększenie produkcji ryb i wzrost jakości przy jednoczesnym zmniejszaniu zużycia wody. Innowacyjny system RAS pozwala na wzrost wyników finansowych, przy jednoczesnym zmniejszeniu zużycia wody i pozytywnym wpływie na ochronę środowiska.

EN

The article discusses issues related to the innovative solutions used in aquaculture. Implementation of the recirculation system allows increasing fish production and growth of the quality while reducing water consumption. The innovative RAS system permits to increase financial results, at the same time, reducing water consumption and exerting a positive impact on the environment.

19

Assessment of a sheltered euhaline area of the southeastern Bay of Biscay to sustain bivalve production in terms of phytoplankton community composition

75%

Bilbao J. , Muñiz O. , Rodríguez J. G. , Revilla M. , Laza-Martínez A. , Seoane S.

Oceanologia

|

2021

|

tom No. 63 (1)

12--26

EN

This study describes the phytoplankton community in sheltered euhaline waters of the Basque coast (southeastern Bay of Biscay). Phytoplankton composition, cell size, abundance, biomass and the presence of potentially toxic taxa, together with chlorophyll a, nutrients and hydrographic and optical conditions were measured, from August 2016 to August 2017, in the Mutriku port, with the main aim of assessing the suitability of the phytoplankton community as a food resource for bivalves. The water column in Mutriku showed the typical environmental conditions of Basque marine waters, with no significant nutrient enrichment caused by anthropogenic pressures. Haptophytes represented the greatest contribution to cell abundance (31-47%), and diatoms were the dominant group in terms of biomass (52-79%), which could favour mussel growth due to their high fatty acid content. In addition, the size structure of the phytoplankton community was suitable for mussel ingestion, since the predominant cell size was 2-20 µm. Regarding toxic phytoplankton, the genera that pose a risk for human health and those that affect negatively mussel physiology and survival were considered. Altogether, ten toxic phytoplankton taxa were identified, contributing in less than 5% to the total cell abundance of Mutriku. However, median chlorophyll a concentration was low (0.5 µg L-1), reflecting the oligotrophic conditions of the area. Therefore, even if the composition of the phytoplankton community could be favourable for bivalve aquaculture, biomass values are low compared to other zones of bivalve production.

20

Produkty rybołówstwa i akwakultury importowane do UE z Afryki. Trendy, gatunki, zagrożenia

75%

Keszka S. , Panicz R.

Przemysł Spożywczy

|

2016

|

tom T. 70, nr 12

8--13

PL

Mimo nierównomiernego rozwoju krajów kontynentu produkty rybołówstwa i akwakultury są obecne na rynkach UE. Głównymi producentami ryb z połowów morskich są: Maroko, Senegal i RPA, natomiast z połowów słodkowodnych Tanzania, Uganda, Egipt i Nigeria. Afryka zwiększyła jednak swój wkład w światową produkcję akwakultury z 1,2 do 2,2% w ciągu ostatnich dziesięciu lat, głównie w wyniku szybkiego rozwoju hodowli ryb słodkowodnych w Afryce subsaharyjskiej. Główni producenci to Nigeria, Egipt i Uganda. Oprócz tradycyjnie importowanych, głównie z RPA i Namibii, gatunków morszczuków, na rynku UE mogą pojawić się nowe gatunki zwierząt wodnych – nie tylko ryb. Kilka ostrzeżeń umieszczonych w systemie RASFF wskazuje na wciąż istniejący problem jakości administracji odpowiedzialnej w krajach Afryki za nadzór weterynaryjny i jakość produktów w eksporcie na rynki krajów UE.

EN

In spite of uneven development of the continental countries, fishery and aquaculture products are commonly available on the EU market. The main fish producers with the largest marine landings include Morocco, Senegal and the South Africa, whereas freshwater fishery products come from Tanzania, Uganda, Egypt and Nigeria. Within the recent decade, Africa has increased its share in global aquaculture from 1.2 to 2.2 %, mainly due to a rapid development of freshwater fish production in the sub-Saharan region with Nigeria, Egypt and Uganda, as the main producers. Except for traditionally imported from South Africa and Namibia hakes, the new species are expected to emerge on the EU market in the years to come and they will be not only fish. A few notifications in recently published RASFF portal indicate to the problems with the administration which is responsible for veterinary control and quality of the exported products from the African to the EU countries.