Cartap 4% (Padan 4G™) at different concentrations was evaluated for its biological deactivation in laboratory-conditions. The insecticide at 1.88 ppm or above concentrations showed significant increase in percent of dead fingerlings up to 46 days insecticide aging as compared to the control, while 0.8 ppm and below proved to be sub-lethal concentrations. The LD₅₀ at 0-day (fresh solution) was 0.997 ppm, which gradually rose to 2.074 ppm up to the day 46. The chemical attained half-life in 44.89 days. Being a very slowly degrading insecticide, Cartap is not desirable in rice-fish culture and a threat to aquatic fauna.

half life --- LD₅₀ --- Cartap 4% --- Labeo rohita --- de-activation

The substrate of Aghireşu area contains several resources, which in time it was exploited and processed in locality. Among them is the brown coal, the gypsum, the kaolin. The exploitations began in galleries, and then passed to phase of surface quarries. After mining was formed several lakes trough the collapse of the galleries; to them was added the artificial lakes too. The Blue Lagoon Lake is a hydrological unit, the most representative of mixed origin. The water characteristics of the lake are under the influence of mineral composition of the substrate, the activity of mining, the erosion processes, the characteristics of lakes depressions, the climate elements, etc. The water physical and chemical properties are analyzed in space and time scale variation. Sampling and analysis made afford to compare the values in horizontally and vertically plain. The paper is part of a larger scale study for some genes` (Cytb, ND4L and D-loop) nucleotidic structure identification by sequencing, to distinguish the structural differences and their exact length inase pairs. Research was carried out on individuals of Carassius gibelio (Bloch, 1782) (Actinopterygii,Cypriniformes) from two different populations, Iezăreni and Movileni (Iaşi, from which dorsal musculartissue was sampled. Mitochondrial DNA (mtDNA) isolation and purification was carried out automaticallyusing Promega’s Maxwell 16 (SEV module). Cytochrome b (cytb) was multiplied by a two stage>polymerase chain reaction (PCR), using two sets of complementary primers (1 set for each fragment).Direct sequencing of PCR products revealed that the cytochrome b has one sequence of 1140bp. Theobtained sequences were subsequently compared with sequences of the same gene from otherindividuals within this species, towards identifying possible differences in the nucleotidic structure.Key Words: Carassius, cytocrhome b, mtDNA.

surface quarries --- hydrological units --- physical features --- hydro-chemical characteristics

Along the Preajba Valley, there were built 12 small basins (1 – 6 hectares and depths of 1-3 meters). From the ecological point of view, the basins belong to the category of eutrophic ecosystems. The primary and secondary production is represented by high values of the phytoplankton, zooplankton and zoobenthos. Ichthyofauna is made up of the following species: Cyprinus carpio, Carassius gibelio, Rutilus rutilus, Abramis brama, Perca fluviatilis, Sander lucioperca. The piscicultural production is estimated at 100 – 200 Kg/ha.

piscicultural hydrobiology --- basins

Present paper aims to bring arguments in favour of Natura 2000 site proposing - Lower Timiş River, for Gobio albipinnatus species conservation. These arguments rely on the author’s original actual data, about Gobio albipinnatus population and its fish community - specific criteria (well preserved fish populations; stable fish populations; healthy fish populations; typical natural habitats; low human impact; favorable geographical position)

Romania --- Banat --- Timiş Natura 2000 --- Gobio albipinnatus Lukasch --- 1933 --- specific criteria

The authors focused their observations on the agresivity behavior of great crested newts from an urban population within the Municipality of Bucharest. The investigations intended to elucidate whether the aggresive behavior is generated by feeding-related features or by reasons of population dynamics, in the form of density regulation or territoriality. Nevertheless, observations regarding theattack on other species of newts (alpine newts – Triturus alpestris) or on the occurence of attacks within age cathegories and differrent biological periods (aquatic larvae, aquatic juveniles, aquatic reproductiveadults, terrestrial active adults, terrestrial hibernating adults) were concerned.

Triturus cristatus superspecies --- newts --- cannibalism --- inter/intraspecific aggresive behavior

In the course of attempting to culture gilthead sea bream in inland brackish geothermal water, indoor and outdoor research studies have been ongoing from early 2006 at the "Bengis Centre for Desert Aquaculture" of the Institutes for Desert Research in Israel, some of which are described below. Gilthead sea bream fingerlings with an average weight of 19 g were acclimated to and reared for 56 days in brackish water of three salinities: 2.5, 3.5 and 4.5 ppt collected from three different locations. At the salinity of 3.5 ppt the fish grew best (P < 0.05) increasing their weight by 121%, while at 4.5 ppt weight increase was by 98%, and at 2.5 ppt – by 90%. In another study gilthead sea bream larvae aged 45 days post hatching, with an average weight of 0.025 g were fed yeast extract enriched Artemia nauplii plus larval dry feed and were grown in brackish water of 2.6 ppt salinity for 8 weeks reaching a weight gain of 92% at a survival rate of 83%. The control groups at sea water (39 ppt) reached at the same time a weight gain of 95% at a survival rate of 98%. In a further study gilthead sea bream juveniles with an average weight of 2.24 g were reared in brackish water with a salinity of 3.6 ppt for 8 weeks and received salt added diets of 4% and 6%. Compared with the control diet with no salt added, both salt rich diets significantly improved the fingerlings growth and survival rates as well as the feed conversion ratio. The 6% salt rich diet promoted fish weight gain by 560% which was the best performance (P <0.05) followed by 448% weight gain with the 4% salt rich diet while the lowest performance with a weight gain of only 360% was obtained with the control (no salt added) diet. The next study with higher levels of salt added diets showed that gilthead sea bream post larvae with an average weight of 0.58 g reared in brackish geothermal water of 2.9 ppt salinity for 10 weeks grew best (P < 0.05) obtaining a weight gain of 778% with the highest survival rate of 88% when fed a diet containing 12% salt. In the studies with the salt rich diets, the salt incorporated was obtained by the evaporation of brine produced during the process of desalination of the brackish geothermal water from the same well supplying the fish rearing water. Worth mentioning at this point is that sea bream, after the termination of the experiments, were further kept for several months in the same brackish water showing further growth with no detrimental effects. The above mentioned research findings show conclusively the possibility of utilizing inland brackish water for culturing gilthead sea bream as an additional alternative to traditional marine farming. This is not surprising, considering the biology of the euryhaline gilthead sea bream, the juvenile of which appears at some stage in their life cycle in low salinity lagoons and river estuaries.

gilthead sea bream --- desert aquaculture --- --- geothermal water --- low salinity

The purpose of this investigation is to establish the dynamics of nitrogen and phosphorus level variation and of their ratio after mineral fertilizers application in water. After mineral fertilizers application into the ponds, the real biogenic quantities in water have increased by 2.8-10 times for nitrogen, and by 2-28 times for phosphates, at scheduled nitrogen levels of 5-7 mg L^-1 and nitrogen/phosphorus ratio of 10:1, 16:1 and 20:1, respectively. During the period 1^st – 3^rd day after fertilizer application, optimum nitrogen levels have been preserved of 2.60 – 5.79 mg L^-1. A tendency of residual biogenic quantities decrease in the water has been observed from the 10^th to the 30^th day after fertilizer application.

water quality --- mineral fertilizers application --- nitrogen --- phosphorus --- ratio

The research was performed on 3375 specimens of sterlet juveniles (Acipenser ruthenus) maintained in five square pools (1.5 x 1.5 x 0.7 m; V=1.125 m³) and in a round pool (Ø=3 m; H=1 m; V=5.63 m³). Water temperature varied between 14-16°C. Sterlet juvenile was fed with Dana Feed forage granulation 1.5 mm (52% raw protein and 13% raw fat). Body weight and body length on 30 individuals from each tank were determined every two weeks. Based on weighings of body mass and quantity of  feed given calculations, it had been established bioproductive indicators at juvenile sterlets aged between 135-178 days. At the age of 178 days, the sterlet juvenile reached an average body mass that ranged between 56.60±2.19 g and 78.50±2.07 g, and an average body length that ranged between 23.83±0.29 cm and 27.22±0.23 cm. Individual values of minimum and maximum body mass were located between 30 g and 104 g and body length between 19 and 30 cm. During the 43 experimental days, the 3375 juvenile sterlets have acquired a real weight gain of 142.91 kg, with a specific consumption of feed of 0.79 kg feed/kg spore and an index of feed conversion of 1.27 kg spore/kg feed consumed.

Acipenser ruthenus --- body weight --- feed conversion --- recirculating system

In this work paper we want to found what is the relation between some morphological features and level of sexual products in a rainbow trout population of 3 and 4 years age. Also, we investigated the influence of extruded pellet fodder on quantitative roes and milt development in the two age categories. The effected researches put into evidence the superior development of females comparatively with males, indifferently on age, with significant and ensured differences. Following the roe quantity and number obtained from females of 3 and 4 years age, we observed that after use of extruded fodder are obtained both quantitative and also numerically superior performances comparatively to those ones obtained after feeding with classical pellet fodder and increase during age, the differences being significant and ensured. There were calculated also the correlations between morphological features taken in study and respective some reproduction indices and were established the directions in which exist real selection and improvement chances. After effected researches and obtained results come out a series of conclusions, following that their basis to be taken selection and improvement measures in view to increase breeding and multiplication performances.

extruded pellet fodder --- three years --- four years --- age --- roe --- milt