Following the culturing of post-juvenile African catfish, wastewaters were purified using single and integrated processes. Iron coagulant (IC), aluminium (AC), lanthanum modified bentonite (LMB) ceramic membranes (NF – nanofiltration) each tested in processes, while combination IC + NF AC used process tests. Among membrane filtration was most effective purifying aquaculture effluent. The total suspended solids (TSS) removed entirely there a near-complete removal turbidity (99.2%), as well Al...

Studies were undertaken on the relationship between egg size and duration of embryogenesis in four freshwater fish species (Salmo trutta L, Esox lucius L., Gasterosteus aculeatus Leucaspius delineatus Heck.). Analyses carried out a comparative sense (different taxa) as well with respect to eggs same species, or even laid by female. In addition understandable differences particular considerable observed regards originating from extreme cases female reached up 11 percentage points (linear...

Abstract Wastewater generated as a result of the fish brining process has very high contamination load. Application appropriate technologies wastewater treatment in order to reuse it production once NaCl content been supplemented can provide an alternative its costly recycling. The experiment included ultrafiltration tests conducted on waste brine originating from food processing industry. results physicochemical indicated reductions fat (100%) and turbidity (99.8%). Reductions were also...

The aim of this study was to determine the levels Na, K, Ca, Mg, Fe, Zn, Cu, Pb and Cd in muscle, liver gills roach (Rutilus rutilus) perch (Perca fluviatilis) from three polymictic eutrophic lakes poor ecological condition north-western Poland. Metals waters lakes, as well livers fish, were determined by atomic absorption. Oxygen deficits summer high concentrations responsible for low water quality studied. Perch showed a potential accumulate metals (bioconcentration factor >1). lowest...

Trout (Salmo trutta L.) and rainbow trout (Oncorhynchus mykiss Walb.) embryos developing in eggs incubated the geomagnetic field are oriented NW-SE. Artificial horizontal magnetic fields of 0.5 1.0 mT, i.e., higher than that natural one but same direction resulted a changed alignment examined. The placed those artificial were aligned N-S NE-SW. A 90° clockwise rotation poles, relative to one, embryos′ orientation being

River pollution resulting from unregulated and improper water sewage management is a global issue of concern. The discharge inadequately treated into rivers the sudden release excessive quantities during heavy rainfall can result in significant fish mortality. This phenomenon has been observed repeatedly case Sąpólna River, NW Poland. Consequently, decision was made to monitor quality at two key locations: drainage channel that feeds river downstream channel. Seventeen indicators were...

Abstract The study examined the development of pike ( Esox lucius L.) roe in water containing variously concentrated coagulants PIX®113 and PAX®18, which are increasingly being used Poland as a method lake reclamation. genital products came from spawners caught natural body (Lake Przybiernów). eggs were incubated taken same lake, subjected to process phosphorus iron precipitation with coagulants. Based on results, it was found that experiment inhibit embryogenesis by formation aggregates...

Effective protection of lakes against degradation requires a detailed recognition the factors leading to their eutrophication. This also pertains small lakes, which constitute an important element various ecosystems and are crucial for maintaining biodiversity. Therefore, aim study is determine trophic state as well susceptibility three in north-western Poland: Maszewo, Starzyca, Nowogardzkie. analyzes morphometric characteristics impact catchment, actual state, phosphorus levels. The...

Our paper presents a study on the middle reaches of Ina River.Select physical and chemical indicators were analyzed in order to evaluate water quality.It was determined that studied river subjected strong anthropopressure, factors declassifying included COD Cr , TP, general hardness, alcalinity.A high level biogenic elements additionally increased by pollution discharged proximity factory specializing agricultural production processing food produce near town Stargard Szczeciński.The process...

Mid-field natural ponds promote regional biodiversity, providing alternative habitats for many valuable animal species. The study’s objective was to determine the most important abiotic factors, including hydrochemical and morphometric parameters, affecting fish occurrence in natural, small water bodies on agricultural lands. studies were conducted nine randomly selected located Poland (the North European Plain). Eleven species of recorded waterbodies, with abundant being cyprinids (mainly...

Abstract Fish farming and especially rearing breeding of rainbow trout carp is one potential sources surface water pollution. The study was aimed at assessing the effect a farm on quality in Gowienica River winter. Temperature, pH, electrolytic conductivity, total suspended solids, dissolved oxygen, BOD5, CODCr, alkalinity, hardness, calcium, magnesium, ammonium-nitrogen, nitrate-nitrogen (III V) phosphorus were determined according to Polish Norms APHA [1995] samples collected winter up-...

Background. Salmonid spermatozoa are characterised by a very short time of activity in the water, therefore sudden water pollution form increased salinity on spawning grounds may have negative effect sperm motility parameters, thus affecting subsequent egg fertilisation and, consequently, number hatched individuals species. The aim this study was to determine parameters brook trout, Salvelinus fontinalis (Mitchill, 1814). Materials and methods. Sperm monitored with camera (Basler A312fc)...

Abstract Effects of water salinity (3.0–9.0 PSU) on the duration and outcome embryogenesis in lesser sandeel (Ammodytes tobianus (L.) as well survival, size, malformation rate newly hatched larvae were followed, based observations involving equipment consisting a microscope still digital cameras. The images obtained measurements egg larval dimensions analyzed using NIS elements Br. computer software package. lowest tested (3.0 PSU), similar to that inshore Baltic Sea waters native for...

Abstract The aim of the study was to analyze and assess possibility using a two-stage filtration system with ceramic membranes: 3-tube module 1.0 kDa cut-off (1 st stage) one-tube 0.45 (2 nd for treating effluent water from juvenile African catfish aquaculture. revealed that during 1 stage water, highest degrees retention were obtained respect to: suspended solids SS (rejection coefficient R I =100%), turbidity (R =99.40%), total iron =89.20%), BOD 5 (RI=76.0%), nitrite nitrogen =62.30%),...

Background. Ruffe, Gymnocephalus cernuus is a small fish inhabiting vast areas of Europe, Asia, and also North America. Its substantial geographical dispersal range in different climatic zones, waters parameters indicates that this particularly plastic species. Recent implementation new fish-processing machinery has increased dramatically the economical importance ruffe, which now treated as gourmet food. In wake interest we decided to study aspects its developmental biology. Methods....