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Background. Greenback flounder (Rhombosolea tapirina) is an Australian species with an aquaculture potential. The main aim of this study was to define the effects of acute salinity- and water quality changes on the blood characteristics and the gill structure of the greenback flounder. Materials and Methods. Juvenile greenback flounder (Rhombosolea tapirina) cultured in sea water (33‰) were transferred...
Background. The frequency distribution of oocytes at different maturity phases can be used to assess environmental effects on gametogenesis in teleosts. As oocyte counting is labour-intensive, little attention is generally paid to changes in oocyte numbers in oogenesis analysis. Materials and Methods. Anterior, middle, and posterior ovarian segments from three pre-spawning female roach, Rutilus rutilus...
Background. Natural antioxidants become increasingly important in fish processing and particularly in the preservation phase of fish raw materials. Some of them can protect lipids, containing essential unsaturated fatty acids. The aim of the present study was to determine antioxidant properties of aqueous extracts of rosemary and sage, compared with the activity of BHA (butylated hydroxyanisole) and...
Background. Ventilation volume is a parameter used mainly for determining oxygen consumption of fish. The aim of the present work was to determine the ventilation volume of carp, under conditions of pure, aerated water. Materials and Methods. Stroke volume and breathing rate of carp representing three size groups (258.7 ± 40.1 g, 449.3 ± 39.6 g, and 663.2 ± 32.3 g) were studied within the temperature...
Background. African longfin tetra, Brycinus longipinnis Günther, 1864, an ornamental fish, commonly occurs in a number of African rivers. The aim of the present paper was to describe elements of ecology of this fish, not hitherto studied in the Niger River delta. Materials and Methods. The fish were sampled monthly in the Jamieson River (tributary of the Benin River, the Niger delta) during dry and...
Background. A number of fish species in the Baltic Sea are known as definitive hosts for Pomphorhynchus laevis but it is unclear which of the Gammarus species is the intermediate host of this parasite. The aim of the present paper was to identify this host in brackish waters of the Baltic Sea. Materials and Methods. A total of 531 scuds (G. salinus, G. zaddachi, and G. duebeni) were collected from...
Background. Fish growth rate is usually determined based on a single sample or a number of sub-samples considered jointly. A study on cisco, Coregonus artedi, successively collected within 6 years in Canada, had demonstrated a possibility of determining size-selective mortality in relation to larger-or smaller fish.Three recent papers on the growth of zander, Sander lucioperca from the Odra River...
Background. Monogenean parasites Pseudodactylogyrus anguillae and P.bini were for the first time recorded on eel in 1995. The aim of the present study was to determine their distribution in Poland and to verify their measurements against literature data. Materials and Methods. A total of 201 young eels ascending rivers of Polish Western Pomerania, emptying to the Baltic Sea, were collected and necropsied...
Background. Early maturation of salmon males (Salmo salar L.) affects the reduction of fish physical condition and culture Materials and Methods. Atotal of 145 salmon males belonging to a group of low growth rate specimens that had not smoltified during the first spawning season were sampled from the "Aquamar" Fish Farm (Miastko, Poland). The study was based on light microscopy examination...
Background. Mrigal, Cirrhinus cirrhosus (Bloch, 1795) (junior synonym C. mrigala ), is one of the most widely cultured Indian major carps.The main aim of this study was to quantify the dietary isoleucine, leucine, and valine requirements of mrigal juveniles. Materials and Methods. Growth studies were conducted with juvenile mrigal to determine the minimal requirements for the branched-chain amino...
Background. Proteolytic enzymes may serve multiple functions: they may inhibit the host′s blood clotting, protect the parasite from the host ′s immune response, facilitate parasite′s migration within a tissue by decomposing the tissue barrier, enhance the hatching and moulting of larvae, and play an important role in their feeding. Learning their identity leads to a better understanding of a host-parasite...
Exotic species of acipenserid fishes have been frequently encountered in the commercial catches of the Baltic Sea, since the early 1990s. Such sightings are rarely reflected as published records. The present paper provides detailed descriptions of two specimens of Russian sturgeons, Acipenser gueldenstaedtii caught in the Exclusive Polish Economic Zone of the Baltic Sea.
Background. Weight-length relationships of discarded species can de used for the estimation of discarded quantities per species, if the species length-frequency distribution is known. In this study, we present weight-length for 26 fish species discarded by commercial trawlers. Materials and Methods. We present weight -length relationships (W=a TL b ), for 26 discarded fish species, from samples caught...
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