QUANTITATIVE AND QUALITATIVE EVALUATION OF ICHTHYOPLANKTON IN THE ROSCI0066 DANUBE DELTA - THE MARIN AREA SITE – A CASE STUDY IN VERNAL SEASON 2012
Journal Title: Current Trends in Natural Sciences - Year 2014, Vol 3, Issue 5
Abstract
Ichthyoplankton are the eggs and larvae of fish and is a component of the trophic spectrum of different consumers, but also is a new ichtyofauna for aquatic ecosystem. To assess the qualitative and quantitative structure of the ichthyoplankton in ROSCI0066 site, in vernal season 2012, the samples were collected using Bongo net in six stations (Sfantu Gheorghe, Zaton, Sahalin, Periteasca, Sulina, Portita). For each particular station were recorded the data like: date when the sample was taken; the geographical coordinates of the station; water depth (m); the number of revolutions of the net. The biological samples were stored in 4% formaldehyde and analyzed in the laboratory. To estimate the number of spawn and larvae per m2 was used Tanaka's formula, by taking into consideration: the sampling depth, the surface net, the number of revolutions of the flow meter, the volume of filtered water (m3), number of spawn or larvae collected. Ichthyoplankton results are expressed in number of individuals/sample and individuals m-2 and for juveniles in numbers/trawling and individuals m-2. In the ROSCI0066 Danube Delta - the Marin Area site, in vernal season 2012, it is found that the diversity of species in the samples analyzed is very low, being identified only four species of fish from the Engraulidae, Clupeidae, Mullidae and Gobiidae families. According to the results, sprat prefers the south of the Romanian Black Sea coast and is prevalent in evidence by the presence of eggs and anchovy by the presence of larvae.
Authors and Affiliations
Carmen Georgeta Nicolae, Madalina Galatchi, Monica Marin, Valodia Maximov, Ion Răducuţă, Gratziela Bahaciu
THE NECESSITY OF IN VITRO PROPAGATION OF MAPLE SPECIES USED IN GARDEN LANDSCAPIND IN ROMANIA
Acer platanoides has many ornamental varieties, easy to propagate by seeds, but mostly by grafting and cuttings. Acer palmatum 'Dissectum Atropurpureum' - the Japanese maple – is a base branched shrub or with short croo...
AGROBIOLOGICAL AND TECHNOLOGICAL EVALUATION OF CHASSELAS DORÉ ELITE CLONAL ACCESSIONS
Four elite clonal accessions of Vitis vinifera L., Chasselas doré variety were identified in a very old plantation, of 110 years, located in Valea Cãlugãreascã, on the St. Nicolas Monastery vineyard. The vines, grafted...
CONSIDERATIONS ON RISK MANAGEMENT APPLIED TO FOREST FIRES
Forest risk and management are ubiquitous in any socio-economic activity. Forestry, more than any other field, is at risk from fire. Consequently, it appears the necessity to implement a fire risk management that could...
USE OF VITREOUS FERTILIZERS WITH SLOW RELEASE OF NUTRIENTS IN VITICULTURE
An experiment was conducted to study the possibility of using vitreous fertilizers made from waste from the glass industry in vineyards fertilization. Six recipes were tested having as composition the basic elements: P2...
BIOTIC AND ABIOTIC FACTORS INFLUENCE DURING THE IN VITRO MULTIPLICATION PHASE OF SOME SPECIES AND VARIETIES OF THE ACER GENUS
The purpose of the research was to study the behavior of several Acer varieties: Acer palmatum 'Dissectum Atropurpureum' and Acer platanoides 'Crimson King', 'Drummondii' and 'Globosum', during the first subculture of t...