There have been some 57 lamprey and fish species recorded in the Upper Vistula Riverdrainage (S-E Poland). Among these there are a number of species-complexes (Carassius auratus, Gobiogobio, Cobitis taenia) with unresolved taxonomy. Identity of some others (Barbus waleckii, Romanogobioalbipinnatus, Cottus gobio) is questionable and needs a review. Phylogenetic relationships of anotherones (Eudontomyzon mariae, Lampetra planeri, Lampetra fluviatilis) is also under debate. Knowledgeabout the distribution of many species is very scarce and needs to be filled. In the current work webriefly summarise present state of the diversity and classification of lampreys and fishes of the UpperVistula drainage and point some urgent questions that have arose in recent years and are waiting fornew solutions.

biodiversity --- evolutionary species concept --- ichthyofauna --- review --- species-complex --- taxonomy

In this paper, we approached a research theme regarding the effects of sea-buckthornHippophae rhamnoides L. added in the diet the common carp Cyprinus carpio upon the disease resistancein case of the imminent disease outbrake due to water condition changes. This research theme wasapproched after studying the references according to which in many cases the sea-buckthorn added inthe diet of the farmed animals, led to good health conditions and resistance against some pathogenagents. Unfortunately, the studied references do not mention the same facts in case of aquaticorganisms. In order to make possible our study, at the end of an experiment which followed the effectsof sea-buckthorn upon the growth and development of the common carp in pond conditions, we tookfrom each experimental lot 10 individuals and transferred them in laboratory conditions. The fishes werekept in aquariums each with a total capacity of 500 L. Feeding was made whith the same feedsexperimented in the pond based experiment, as follows: Lot I - control feed without sea-buckthornadding; Lot II - feed whith 1% sea-buckthorn, and Lot III was fed with feed containing 2% seabuckthorn.The experiment took place in a relatively short period of time, between 18.10.2010-12.11.2010. In this period of time, we followed the effect of sea-buckthorh added to the fish meal, uponthe resistence against some pathogen agents which infect fishes once the water parameters are changed.The results obtained, at the end of our study, makes us support theuse of sea-buckthorn in the diet offishes in order to stimulate the resistance against some diseases.

sea-buckthorn --- carp --- water condition changes --- disease --- immunostimulant --- health

Economic activities, industrial and agricultural ones, have the direct goal to help increasing thequality of life of our society. Beside positive direct and desired effects of the economic activities, thesehave also negative, undesired and sometimes unthinkable effects on the environment and society. Afterthe Conference for Environment in Stockholm in 1972 and the first report to the Club of Rome, "Limits toGrowth", was understood that besides wanted effects of technological progress, undesired negativeeffects can appear. In this context the concept of sustainable development has been for the first timedefined 1987 in the Brundtland-Report and is nowadays very much discussed on different levels.Considering the sustainability of our society it is necessary to evaluate all economic activities,aquaculture as well, not only from economic and technical points of view, but from environmental andsocial ones as well. The concept of sustainable aquaculture has been developed and tries to take intoconsideration all the aspects related to assuring the sustainability of our society on a global level.

aquaculture --- sustainable development --- global problems --- sustainable aquaculture --- environmental impacts

Hydrogen peroxide was investigated as a potential algaecide for the filamentous epiphyticalga, Compsopogon caeruleus (Balbis ex C.Agardh). The goal was to determine if hydrogen peroxidecould be used to eliminate C. caeruleus, without affecting two other aquatic plants, Ceratopteris thalictroides, and Hygrophila rosanervis. A zebrafish (Danio rerio) was also exposed during thetreatment, to observe the effects of hydrogen peroxide on fish. Concentrations between 1mM and 6 mM l^-2were tested for their ability to induce bleaching or tissue disintegration in plant and algal tissues. 1mM l^-2 hydrogen peroxide had no major effect on the alga, or on the plants. The 3 mM solution inducedpartial bleaching in C. thalictroides and damaged significantly de filamentous alga. The 6 mM solutionkilled completely the alga and damaged significantly the C. thalictroides. H. rosanervis suffered minorlesions during the treatment. D. rerio wasn’t affected by the mentioned concentrations of hydrogenperoxide.

hydrogen peroxide --- Compsopogon --- Ceratopteris --- Hygrophila --- algaecide --- bleaching --- tissue degradation

The experiment was organized to investigate the recovery of additional food (fodder andterrestrial vegetation) given to fish, Ctenopharyngodon idella, in particular through the study of nutrientdigestibility. Studied forage digestibility was determined through laboratory experiments, conductedbetween June 20 to 30, 2009, using 10 individuals of the species Ctenopharygodon idella from fish farmMovileni, Iași. There were formed two experimental groups, each of five individuals per group,differentiation between the two groups was the type of feed used, respectively specific fodder and greenclover green mass harvested in bud’s phase. To determine organic matter digestibility from feed we usedthe direct method, which consists in weighing all feed ingested, scrap feed and faeces removed. For thispurpose in each aquarium was placed one fish, after which the tanks were covered with netting and setwith oxygenation of the water pump. Statistical analysis of the data obtained from the experiment showsthat the average values of the coefficients of digestibility of nutrients from fodder and green clover havebeen very significant differences. If we compare the mean values of digestibility coefficients of organicsubstances in the two types of forage (green clover and fodder) we can say that the fodder is digestedand assimilated better than clover. Thus, in fodder at a protein content of 378.7 g / kg DM (dry matter),there was a digestibility coefficient of 92%, while at a lower protein content of 312.5 g / kg DM, in thecase of green clover, the digestibility coefficient was 69%.

fish --- digestion --- food --- nutrients --- enzymes

Water is an important element to human life, this is why around water sources humansettlements have been built which led to the development of these specific areas. One person needs aminimum of 5 L water per day, out of which 1.5-2 L are consumed as know and the rest is beingretained from food (Ghidra 2004). Due to this water pollution has a negative impact on human andanimal health and it also affects the surrounding environment. Water pollution means changes on itsnatural qualities and the inclusion of foreign elements, resulted from a series of natural and artificialphenomena, making it unsuitable for the previously mentioned aims. Water pollution can be natural orartificial and it can have permanent, irregular or accidental effects.

point source --- non-point source --- pollution --- effects --- prevention

In this work, we evaluated the acute toxicity caused by zebrafish (Danio rerio) exposure tovarious concentrations of tetrabuthylammonium bromide. The ionic liquid’s acute toxicity on zebrafishwas assessed according to the lethal effects after a 96-hour exposure. To perform the test ontetrabuthylammonium bromide’s acute toxicity, we carried out three series of experiments; during eachseries, we used five different ionic liquid concentrations, respectively: 10; 25; 50; 75; 100 mg L^-1 for theexperiment I, 200; 400; 600; 800; 1000 mg L^-1 for the experiment II and 1500; 2000; 3000, 4000 and5000 mg L^-1 for the experiment III. All these batches were compared with the control variant. Thehistopathological examination was performed on individuals from the control group and on all the deadfish. The results of the acute toxicity test reveal that the LC50 value after 96 hours is between 2500 and3000 mg L^-1. The fish exposed to 4000, respectively 5000 mg L^-1 tetranuthylammonium bromide diedduring the first 24 hours after exposure. The values obtained for tetrabuthylammonium bromide aremuch smaller than the data obtained for LC50 at 96 hours for other solvents like acetone (30642 mg L-1), respectively DMF (12220 mg L^-1), but much bigger than the toluene (60 – 313 mg L^-1), benzene(203mg L^-1), phenol (5 mg L^-1), etc. The histopathological study on gill, skin, liver, kidney and intestinereveal that the changes occurred within the structure of these organs are intensified with the increase oftetrabuthylammonium bromide concentration.

ionic liquids --- tetrabuthylammonium bromide --- Danio rerio --- acute toxicity --- histopathology