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The article includes the results obtained in the growth experiments during the postembryonic development period of the North American sturgeon species Polyodon spathula. The experiments took place in the years 2020 and 2021. Sturgeon larvae aged 5 days old, obtained through artificial reproduction at SCDP Nucet, were stocked and raised until the age of 35 days in two variants, in concrete tanks (useful volume -120 m3 /tank), located in the pilot station intended for fish culture experiments from the SCDP Nucet gen...

Soil science literature divided the soil biodiversity into ?three broad functional groups called chemical engineers, biological regulators and ecosystem engineers.? The paper pointed out (by the aim of the microscopic tools) the main ecosystem services provided by the biodiversity of (micro) organisms living into the soil at the organic-inorganic interface, where they built a favorable environment for themselves, the crop roots, and the entire ecosystem. The studied sites are located into different pedolandscapes ...

The paper objective was to emphasize the quality of the biodiversity life in an anthropic polluted soil and to underline the influence of the biological activity on the evolution and self-remediation of this soil. The studied site is located in the Apuseni Mountains, in the Ampoi Valley, on a slope ? 25%, facing north, under pine plantation. In the area, the prevailing soils are Cambisols and Luvisols formed into the coarse slope deposits dominated by sandstones. The site pollution was due to the atmospheric emiss...

The paper emphasizes the ecological restoration (renaturation) of the natural conditions of a saline soil, which was previously under long term melioration. The soil is a Salinic Pelic Alluvic Sodosol with relict gleization, covering an Alkali soil (according to SRTS-2012). The site is located in Moldova Tableland, where Tma is 584.6?C and Pma is 9.5 mm. The depth of the groundwater table is about 1.80 m, with frequent seasonal fluctuations and weak-moderate mineralization. The soil had a polyphasic evolution, bot...

The paper emphasizes the deep influence of soil biota on pedobioplasma illuviation and on the evolution of illuvial coatings formed in soils with Fe-humic-clayey pedobioplasma. In the studied soils, two main types of pedofeatures were noticed, which pointed out that soil biota initiated and controlled the important pedogenetic processes: coprolites (pedofeatures generated by biological activity), as well as illuvial coating (textural pedofeatures generated by illuviation). Two types of coprolites were dominant: a)...

The paper presents the results obtained in the artificial reproduction of carp breeds (Cyprinus carpio): Frasinet, Ineu and Ropsa between 2015 and 2017. Carp used in artificial breeding experiments (body weight 4,5 - 8,0 kg / ex., 4-7 years old) were raised in the ponds within the experimental base of the Fish Culture Research and Development Station Nucet, Romania. For the induction of maturation and ovulation the carp pituitary extract (CPE) and Nerestin 6A were used. The carp pituitary extract (CPE) was given i...

The paper presents the results obtained in the artificial reproduction of carp breeds (Cyprinus carpio): Frasinet, Ineu and Ropsa between 2015 and 2017. Carp used in artificial breeding experiments (body weight 4,5 - 8,0 kg / ex., 4-7 years old) were raised in the ponds within the experimental base of the Fish Culture Research and Development Station Nucet, Romania. For the induction of maturation and ovulation the carp pituitary extract (CPE) and Nerestin 6A were used. The carp pituitary extract (CPE) was given i...

The objective of the paper was to investigate the presence of calcium oxalate crystals in the roots of grapevine Merlot/Kober 5BB from Murfatlar Vineyard, and their correlation to the high content of total and active calcium carbonate in soil, inherited from the parent material. Calcium oxalate is a bio-mineralization major product that formed in the superior plants (like the grapevine - Vitis vinifera), occurring as crystals of various shapes (druses, raphides, envelopes, etc.) and supposing to have also various ...

Urban sprawl and land abandonment are the major threats to agricultural areas, as highlighted the European Environment Agency. Bucharest metropolitan area is a proposed metropolitan area project, aiming to reach 2700 km2 in an intermediate stage. This area would include Bucharest City and other 62 surrounding LAUs from Ilfov, C?l?ra?i and Giurgiu Counties. The paper aims to assess the dynamics of soil sealing and soil landscape patterns and to evaluate soil productivity lost due to the urban sprawl within the Buch...

This paper presents results of research on feeding behavior of paddlefish (Polyodon spathula, Walb. 1792), performed at the Fish Culture Research and Development Station Nucet, DпїЅmbovi?a, between 2002 -2007. The results confirmed the planctonofag character of this species. Paddlefish food consists primarily of zooplankton, insects and insect larvae, plant debris and detritus, identified in the intestinal contents. Feeding behavior is differentiated by age and size of fish. During the first days of life, juvenile...

Along the whole history, the human civilizations were depended mainly on the soil fertility and further on the ecosystem well function and its appropriate characteristics. These functions (as natural processes occurring in ecosystems) depend on its structure (on biotic and abiotic constituents respectively) and provide ecosystem services. The paper emphasized the way that one of the ecosystem services, essential to our health and well being, as the пїЅregulation of the nutrients and their uptake? arises from the i...

This paper presents the diversity of parasites species identified on cultured fish species, the degree of infestation and the epizootological state in nine fish farms (most of them producing fish fry for stocking other fish farms). These farms are located in five counties in the south of Romania (Arge?, DпїЅmbovi?a, Teleorman, Giurgiu and C?l?ra?i). A total of 653 fish were investigated. The fish species belong to two fish families namely Cyprinydae: Abramis brama, Cyprinus carpio, Carassius gibelio, Hypophthalmic...

The objective of the paper was to emphasize the influence of the biological activity on the structural improvement of the compacted clayey pedogenetic horizons of two Chromic Luvisols, by the organic matter bioturbation. The researches were performed on two Chromic Luvisols from Romanian Plain, where the mean annual temperature is 10.5oC and the mean annual precipitation is 548 mm. The analytical data showed that clay content increased from the top layer of both soil profiles (28.9% in P1, and 29.8% in P2), to Bt ...