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001-es BibID:	BIBFORM130712
Első szerző:	Hetényi Zoltán László (phd hallgató)
Cím:	Cannibalism and its importance in Aquaculture: A review / Hetényi, Zoltán László; Molnár, Péter István; Bársony, Péter; Fehér, Milán
Dátum:	2025
ISSN:	1587-1282 2416-1640
Megjegyzések:	Intracohort cannibalism may lead to significant losses during the early life stages of farmed fish. The mechanisms driving cannibalism dynamics are common across many fish species and are closely linked to the factors that influence growth variation within a population. This genetically encoded behaviour allows the individual to eliminate competitors in the competition for resources and increases the chances of survival and reproduction. Many fish species display aggression towards individuals of the same species, which can often lead to cannibalistic behavior. This foraging strategy is also present in intensive aquaculture systems, and its economical, ecological and phylogenetic implications have been debated by many researchers. Many fish species can be produced economically in recirculation aquaculture (RAS) systems, but the efficiency of larval and juvenile rearing remains a bottleneck for most species. The success of initial rearing depends on many factors. In addition to genetic factors, the level of cannibalism is mainly influenced by the applied production and feeding technology. Literature suggests that mortality during larval rearing can be as high as 50%, largely due to aggression. In the case of predatory fish species, the presence or absence of certain husbandry conditions can lead to even higher levels of cannibalism, which significantly reduces production yields by causing mortality and secondary injuries, thus further decreasing the survival rate. This review therefore aims to identify and quantify the effects of biotic and abiotic factors that influence cannibalism
Tárgyszavak:	Agrártudományok Állattenyésztési tudományok idegen nyelvű folyóiratközlemény hazai lapban folyóiratcikk cannibalism aquaculture larval and juvenile rearing of fish survival size heterogeneity
Megjelenés:	Agrártudományi közlemények = Acta agraria Debreceniensis. - 2025 : 1 (2025), p. 43-54. -
További szerzők:	Molnár Péter István (1996-) (Állattenyésztő mérnök) Bársony Péter (1975-) (agrármérnök) Fehér Milán (1985-) (agrármérnök)
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001-es BibID:	BIBFORM130537
Első szerző:	Molnár Péter István (Állattenyésztő mérnök)
Cím:	The use of Common duckweed (Lemna minor) as a biological filter in the rearing of hybrid African catfish (Clarias gariepinus x Heterobranchus longifilis) / Molnár, Péter; Bereczki, Csaba; Bényi, Benedek Csaba; Bársony, Péter; Fehér, Milán
Dátum:	2025
ISSN:	1587-1282 2416-1640
Megjegyzések:	The African catfish (Clarias gariepinus x Heterobranchus longifilis) is one of the most important fish species in Hungarian aquaculture. The larvae and juveniles are reared at high feeding rates, which can reach up to 10% of the biomass. Intensive feeding results in large amounts of effluent water, directly proportional to the intensity of fish production. The aim of this experiment was to investigate the potential of Common duckweed (Lemna minor) as a biological filter and its nutrient removal capacity during intensive fry rearing of the hybrid African catfish. In a recent study, two experimental recirculation systems, identical in water volume and design, were set up, in one of which duckweed was grown under aquaponic conditions, where the concentrations of nitrogen and phosphorus forms were monitored and the production parameters of the fish were determined. The results obtained from the experiment showed that the use of duckweed as a biological filter improves the water quality of the recirculation system. A significant amount of plant biomass was produced, which mainly reduced the nitrate and orthophosphate concentrations in the system water. As a consequence, the survival of hybrid catfish was improved, which also affected biomass growth, but had no effect on other parameters.
Tárgyszavak:	Agrártudományok Állattenyésztési tudományok idegen nyelvű folyóiratközlemény hazai lapban folyóiratcikk aquaculture aquaponics African catfish duckweed
Megjelenés:	Agrártudományi közlemények = Acta agraria Debreceniensis. - 2025 : 1 (2025), p. 107-112. -
További szerzők:	Bereczki Csaba Bényi Benedek Csaba Bársony Péter (1975-) (agrármérnök) Fehér Milán (1985-) (agrármérnök)
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001-es BibID:	BIBFORM112638
Első szerző:	Molnár Péter István (Állattenyésztő mérnök)
Cím:	Preliminary results of the combined production of duckweed Spirodela polyrhiza and common carp (Cyprinus carpio) in an aquaponic system / Péter Molnár, Judit Éva Lelesz, Attila Kertész, Gábor Bereczki, Milán Fehér
Dátum:	2023
ISSN:	1587-1282
Megjegyzések:	As a result of population growth, increasin amount of food is needed, and agriculture is under an increasing burden to meet these needs. Traditional agriculture is often attacked due to its environmental impact. We must find alternative, environmentally friendly ways to produce more food. Aquaponics is a closed system in which we can produce both fish and plants at the same time. Duckweed species are small, aquatic, floating plants belonging to angiosperms. It can potentially be an alternative protein source, due to its high protein content, good amino acid supply, and rapid growth. Under suitable conditions, it doubles its weight in 2-4 days, and can reach a yield of 30 t ha-1 year-1 in dry matter. It forms a carpet on top of the water and can be found in slow-moving or still waters. Since they are resistant to a wide range of nutrient concentrations, they are also suitable for cleaning wastewater (such as eutrophicated lakes, sewage reservoirs, liquid manure storage). Fish feed is the primary nutrient source for aquaponic systems, which usually contains fishmeal. If duckweed can be used as an alternative for fishmeal in the feed, it could improve the sustainability of the aquaponic and aquaculture systems. In this study, the aim was to develop an optimal harvesting protocol for duckweed Spirodela polyrhiza under aquaponic conditions. In a four weeks experiments, four harvesting protocols were set up, a control where only biomass measurements were made, a 25% group where 25% of the biomass at the time of measurement was harvested, and a 50% and a 75% group where at the time of measurement 50% and 75% of the biomass was harveste d. Three replicates were used per treatment. We weighed the biomass every week and removed the amount corresponding to the group. Based on the preliminary results, it can be said that more biomass was obtained in the groups with the 25% harvesting protocol and the control group.
Tárgyszavak:	Agrártudományok Állattenyésztési tudományok idegen nyelvű folyóiratközlemény hazai lapban folyóiratcikk aquaponics duckweed alternative protein source
Megjelenés:	Agrártudományi közlemények = Acta agraria Debreceniensis. - 1 (2023), p. 83-89. -
További szerzők:	Lelesz Judit Éva (1986-) (agrártudományok, gyógynövénytermesztés) Kertész Attila (1988-) (agrármérnök) Bereczki Gábor Fehér Milán (1985-) (agrármérnök)
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001-es BibID:	BIBFORM134059
Első szerző:	Teye-Gaga, Christopher
Cím:	Utilization of live feeds in fish larviculture: a review / Christopher Teye-Gaga, Péter István Molnár, Elshafia Ali Hamid Mohammed, Péter Bársony
Dátum:	2025
ISSN:	1587-1282 2416-1640
Megjegyzések:	This review examines the significance of live feeds in commercial aquaculture industry for production of fish and shrimp larvae, along with various challenges and prospects. Live feeds are an essential food source in larviculture, especially for marine fish, which depend on them for nutrition during the initial days of exogenous feeding. They are palatable, highly digestible, and their movement stimulates natural hunting and foraging instincts, promoting better development, lowering captivity stress, and increasing survival rates. Artemia is the most commonly used live feed in larviculture; however, it has low levels of omega-3 HUFA. Copepods are the most nutritionally rich live feed, containing high levels of DHA and EPA. Despite these benefits, they are less frequently used in larviculture due to technical challenges associated with large-scale cultivation at high densities. The use of live feed is labour-intensive and costly. The feeding period for fish larvae can be shortened using a co-feeding strategy. Microalgae rich in DHA have been utilized to enrich live feeds. Further research is needed to determine the most effective approach to significantly reduce the weaning time of fish larvae from live feed. This will lead to gradual and eventual complete replacement of life feed in the near future.
Tárgyszavak:	Agrártudományok Állattenyésztési tudományok idegen nyelvű folyóiratközlemény hazai lapban folyóiratcikk
Megjelenés:	Agrártudományi közlemények = Acta agraria Debreceniensis. - 2025 : 2 (2025), p. 103-116. -
További szerzők:	Molnár Péter István (1996-) (Állattenyésztő mérnök) Mohammed, Elshafia Ali Hamid (1987-) (agrármérnök) Bársony Péter (1975-) (agrármérnök)
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