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This study evaluates the influence of dietary supplementation with royal jelly on growth dynamics in sterlet (Acipenser ruthenus), a species of significant interest in aquaculture. Throughout a controlled experimental period, juvenile sturgeons were fed diets containing varying concentrations of royal jelly and were monitored for key growth performance parameters, including weight gain, specific growth rate, average daily gain, and feed conversion ratio. The results revealed a significant impact of royal jelly sup...

Aquaculture has become an essential component of global food production, offering a sustainable source of animal protein. However, the sector continues to face significant challenges related to environmental sustainability and suboptimal reproductive efficiency. In recent years, the incorporation of plant-derived bioactive compounds, commonly referred to as phyto-additives, has emerged as a promising, natural alternative to synthetic additives and chemotherapeutics. These substances can improve growth performance,...

Sterlet (Acipenser ruthenus) is a species with seasonal reproduction, temperature being considered one of the most important key factors that ensures the seasonal reproductive cycle. The wintering temperature should be carefully controlled to prevent any adverse effects on reproduction. In many fish species, the wintering at high temperatures have a negative impact on reproduction success. The aim of this study is to evaluate the impact of wintering temperature on sterlet males by evaluating the quantity and quali...

Reusing and recirculating the water in which aquatic organisms are cultivated is a crucial goal in improving the sustainability of aquaculture. As a result, recirculating aquaculture systems (RAS) have become increasingly popular recently as a means of raising various fish species, including sturgeons. Sterlet (Acipenser ruthenus) and a sturgeon hybrid (a cross between male A. gueldenstaedtii and female A. ruthenus) were reared in a RAS, and their growth was monitored during the first 6 months of their life. The a...

In the current context, in which the European Union, through various projects, requires the reduction of the consumption of pesticides it is necessary to investigate some different products to control the Phytophthora infestans potato blight, biological ones, that have the role of improving the structure and health of the soil, avoiding contamination of it but also of groundwater with synthetic active substances. Potato production is diminished by the presence of weeds, pathogens and pests. One of the most importa...

Aphids have grown significantly both in number of species and in number of individuals in populations, especially in green spaces in urban environments. By feeding, they affect the plants in the structure of the ecosystem at the foliar and floral level, therefore it is necessary to manage them so that they are numerically reduced but at the same time to avoid the application of pesticides. Through this work, 2 ways of management were tried for 5 months (April-August): by exploiting existing natural enemies and by ...

In the western part of Romania, Helicoverpa armigera larvae cause significant damage to several types of agricultural and horticultural crops leading to considerable economic losses, so the purpose of this paper was the use of some ecofrendly agricultural practices, namely the use of entomopathogenic microorganisms. The field experiment was conducted at the Research farm of West Land Company SRL, Jimbolia, (Timis County). The trial was laid out during 2022 vegetation season, in randomized block design with seven t...

Asclepias syriaca is a perennial species, native to North America. In Romania, being introduced as an ornamental species, in present being found in different habitats (agroecosystems) and on ever wider areas causing damage. Although the basic biological characteristics of Asclepias syriaca are known, its control is a significant problem. As a result, we hypothesized that temperature and sowing depth can be used to reduce the population of Asclepias syriaca. To test this, the seeds were put at 5?C, 27?C, room tempe...

In Romania, wheat is the main crop, occupying the largest area of arable land. Convolvulus arvensis is a competitive and invasive weed, produces direct and indirect damages to which is added production of allopathic substances. Allelopathy is a natural phenomenon which refers to any direct or indirect effect, positive or negative of a plant (including microorganisms) on the other by the release of chemical compounds in the environment [13]. In most cases, influence is inhibitory, which may explain why some plants ...

One of the species with the negative impact for corn crops in Europe is the coleopteran insect of Diabrotica virgifera virgifera (LeConte). The invasiveness but also the damage caused by adults can reduce the production of corn grain visible. By monitoring activities organized at local or national level (in Romania) often made confusion because coloristic variety intraspecific observed in insect populations. To identify the causes of color variability morphological studies were done on several samples present in d...

Multicolored asian ladybird Harmonia axyridis Pall. is a well-known aphid predatory species, of Asian origin. The species is classified taxonomically, at present, in the tribe Coccinellini family Coccinellidae. The species is considerate bivoltine, but may submit up to 5 generations/ year. The main role of the species is its use in biological control. A negative impact on potential benefits that accompany this coccinellid would be predation insects native to the same family. Current status of invasive species is t...