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Summary. The objective of studies carried out in 2003 was the investigation of the most important biological and morphometrical features of the fished population of vendace from the Winnogora lake lying in the Miedzychod-Sierakow... more
Summary. The objective of studies carried out in 2003 was the investigation of the most important biological and morphometrical features of the fished population of vendace from the Winnogora lake lying in the Miedzychod-Sierakow Lakeland. The following features were studied: sex structure, growth rate, fish condition, fertility, as well as biometric and meristic features of the studied vendace. At the same time, the most important physicochemical water indices were determined permitting to characterise the environmental conditions. The lake water (on the basis of seven physicochemical indices) can be classified to the 2nd purity class. However, it has been found that in the summer season, the hypolimnion is almost completely deoxidized. Vendace from the studied lake belongs to a group with a medium growth reaching in the third year of life the mean total length of 0.90 cm. Fulton’s index of fish condition oscillated from 0.69 to 1.27 with a mean value of 0.90. The mean absolute fer...
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Summary. Alimentary tracts of 202 pikes originating from two different biotopes, a river and a carp pond, were analysed. Both in the river and the pond, in pike food, there dominated roach and perch. As far as the mass of pike’s preys is... more
Summary. Alimentary tracts of 202 pikes originating from two different biotopes, a river and a carp pond, were analysed. Both in the river and the pond, in pike food, there dominated roach and perch. As far as the mass of pike’s preys is concerned, among pikes originating from the river, there dominated crucian carp (57.9%), while in the mass originating from the pond, perch (53.9%) was the dominant. Weight coefficient of food differentiation between the studied habitats differed only slightly. A similar situation was found in case of the index indicating the filling of alimentary tract. A significant difference occurred in the values of the differentiation of food regarding the quantity. For pikes from the river, the coefficient value amounted to 4.24 and for pikes from the pond, it was 2.24. Studies have confirmed that regardless of the biotope in which pike occurred, roach and perch dominated in the food. On the other hand, the place of living exerted a significant influence on t...
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Simple Summary Bivalves such as clams, mussels, and oysters provide a good source of protein, glycogen, and minerals. The high-value compounds and bioactive properties of these organisms are well known and confirmed by numerous scientific... more
Simple Summary Bivalves such as clams, mussels, and oysters provide a good source of protein, glycogen, and minerals. The high-value compounds and bioactive properties of these organisms are well known and confirmed by numerous scientific studies. During the last two decades, the freshwater mussel Sinanodonta woodiana as one of the most invasive species, has penetrated into Europe along with fish shipments from Asia. Numerous studies indicate that both the soft tissues and mussel shells of this low-grade species may constitute promising biomaterial with potential processing ability. Due to growing interest in new raw materials having been observed recently in the pet food market, this study aimed to obtain and evaluate selected quality attributes of freshwater pond mussel powder. After initial ecotoxicity testing in vitro, powdered mussel tissue was evaluated with respect to its basic physicochemical and functional properties, such as solubility, emulsifying capacity, and gel-formin...
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Mussels Sinanodonta woodiana in ponds neighboring with forests. The population of Chinese pond mussel is increasing in entire Europe and is spreading efficiently settling both stagnant as well as flowing waters and occurring also in cool... more
Mussels Sinanodonta woodiana in ponds neighboring with forests. The population of Chinese pond mussel is increasing in entire Europe and is spreading efficiently settling both stagnant as well as flowing waters and occurring also in cool reservoirs. On the 11 positions analyzed the occurrence of S. woodiana 6 bordered by forest, and three were on the Natura 2000 areas. A part from analyzed sites being used fish ponds is bordering directly with forest enabling wild animals to prey around ponds. At the lack of data about significance of S. woodiana it is necessary to warn against introductions of stenothermic fishes into such ponds and against happening intentional relocations of this mussel.
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The European perch (Perca fluviatilis L.) is a common freshwater fish which is widely distributed in Europe and Asia and has been successfully introduced to New Zealand and Australia. It is the intermediate and definitive host of many... more
The European perch (Perca fluviatilis L.) is a common freshwater fish which is widely distributed in Europe and Asia and has been successfully introduced to New Zealand and Australia. It is the intermediate and definitive host of many parasites, especially endoparasites, such as trematodes, cestodes and nematodes (Bikhovskaya-Pavlovskaya and Kulakova,1987; Carney and Dick, 1999; Behrmann-Godel and Brinker, 2005; Wierzbicka et al., 2005; Kuchta et al., 2009). Information concerning the parasites of perch can be found in widely published literature (Rolbiecki, 2006; Halmetoja et al., 2000), but still little is known about aspects such as the age dynamics of infections with endoparasites. Parasites provide a great deal of biological information about their host, regarding migration, differences in diet, and food web structure (Williams et al., 1992; MacKenzie et al., 1995; Marcogliese et al., 2006). On the other hand, parasitism may influence the behaviour of fish (hosts), resulting in...
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The aim of the study was to determine selected characteristics of surimi-like material (SLM) made from the muscle tissues of Sinanodonta woodiana (Lea, 1834) freshwater mussels. The research material consisted of unwashed mussel muscle... more
The aim of the study was to determine selected characteristics of surimi-like material (SLM) made from the muscle tissues of Sinanodonta woodiana (Lea, 1834) freshwater mussels. The research material consisted of unwashed mussel muscle homogenate as the control sample—C, mussel muscle tissue twice washed with water (SLM-W) and sample washed with NaCl at a concentration of 0.169 mol/L as well as water (SLM–S). A raw control sample and surimi like-materials were analysed using the SDS-PAGE technique. They were also tested using the DMTA method (dynamic mechanical thermal analysis) while heating the samples up to 80 °C and cooling to 20 °C. The thermal drip and texture of gels after heating (75 °C, 30 min) were also determined. The washing procedure had a significant impact on the protein composition of the SLMs. A significantly (p < 0.05) higher percentage of proteins with molecular weights of 270–273 kDa and 105–110 kDa (corresponding to specific filamin isoforms), as well as 42–4...
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„Journal of Research and Applications in Agricultural Engineering” 2017, Vol. 62(3) Jan MAZURKIEWICZ 117 Janusz GOLSKI, Sławomir RUNOWSKI, Mieczysław GRZELAK, Wojciech ANDRZEJEWSKI, Jan MAZURKIEWICZ 1 Poznan University of Life Sciences,... more
„Journal of Research and Applications in Agricultural Engineering” 2017, Vol. 62(3) Jan MAZURKIEWICZ 117 Janusz GOLSKI, Sławomir RUNOWSKI, Mieczysław GRZELAK, Wojciech ANDRZEJEWSKI, Jan MAZURKIEWICZ 1 Poznan University of Life Sciences, Institute of Zoology Division of Inland Fishery and Aquaculture ul. Wojska Polskiego 71 C, 60-625 Poznań, Poland 2 Poznan University of Life Sciences, Department of Grassland and Natural Landscape Sciences ul. Dojazd 11, 60-632 Poznań, Poland e-mail: esox.poznan@interia.pl Received: 2017-07-25 ; Accepted: 2017-08-22
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An increasing threat to local, native freshwater mussels (Unionida)—an ecologically important but globally alarmingly declining group—is the invasion by exotic bivalves. The Enemy Release Hypothesis predicts that introduced species should... more
An increasing threat to local, native freshwater mussels (Unionida)—an ecologically important but globally alarmingly declining group—is the invasion by exotic bivalves. The Enemy Release Hypothesis predicts that introduced species should benefit from enemy-mediated competition because they are less likely to be harmed by natural enemies, such as parasites, than their native competitors. We investigated within-site differences in parasitism between sympatric native (tot. five spp.) and invasive (tot. three spp.) bivalves in eight northern European waterbodies, which harboured totally 15 parasite taxa. In paired comparisons using within-site averages, the mean number of parasite species in the native bivalves was 2.3 times higher, and the sum of parasite prevalences 2.4 times higher, than in the invasive bivalves. This may lead to enemy-mediated competitive release of invaders and contribute to the success of invasive freshwater bivalves, in general. However, while the invasive clam ...
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In 1997, 375 cultivated wels specimens were released into Lake Goreckie, which is located in the Wielkopolski National Park. The average mass per specimen was 1,350 g. Control catches were made in 1998 and 1999, and the diet consumed by... more
In 1997, 375 cultivated wels specimens were released into Lake Goreckie, which is located in the Wielkopolski National Park. The average mass per specimen was 1,350 g. Control catches were made in 1998 and 1999, and the diet consumed by the wels was investigated. The striped crayfish Orconectes limosus Raf. was detected in 51% of the fish caught. The contribution of striped crayfish to the wels diet fell to 4% after two years. This was probably correlated with changes in the feeding grounds of the older wels.
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Sinanodonta woodiana (Lea 1834) is a new component of malacofauna and this condition enhances a new adaptation of predators preying on it. In 2010, during the autumn bird migration, an oystercatcher was observed feeding on this clam... more
Sinanodonta woodiana (Lea 1834) is a new component of malacofauna and this condition enhances a new adaptation of predators preying on it. In 2010, during the autumn bird migration, an oystercatcher was observed feeding on this clam species alien to European fauna in the area of drained fish ponds (western Poland). The clams chosen by the oystercatcher were 64 to 98 mm long and 46 to 72 mm tall, whereby stabbing method was preferred to the hammering one. Theses sizes are greater than for other mussel species eaten by the oystercatcher. Mussels were typically collected in the depth of 7 cm, which reflects the maximum bill length in oystercatchers. Under some conditions, e.g. drained fish ponds, the population abundance of S. woodiana clam may significantly be affected by foraging birds, especially oystercatchers as suggested findings from our study.
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Summary. The objective of studies carried out in 2007 was the investigation of the most important biological features of the fished vendace population from the Gorzynskie lake lying in the Miedzychod-Sierakow Lakeland. In order to realize... more
Summary. The objective of studies carried out in 2007 was the investigation of the most important biological features of the fished vendace population from the Gorzynskie lake lying in the Miedzychod-Sierakow Lakeland. In order to realize this goal, the growth rate, fish condition and fecundity of the fish were studied. Typical fishing equipment was used. In the catches, two-year-old individuals were dominated. Vendace from the studied lake belongs to the group of fish with a quick growth reaching in their third year of life the total length averaging to about 22.01 cm. The mean value of Fulton’s condition coefficient in three measurement periods showed 0.902, 0.945 and 0.800 coefficient values, respectively. Vendace from the Gorzynskie lake is characterised by a high fecundity as compared with the majority of other lakes.
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Bacteria play an extremely important role in the digestive processes occurring in the digestive tract of all vertebrates. A disturbance of microbial balance may lead to disorders in digestive processes. Due to the high demand for fish... more
Bacteria play an extremely important role in the digestive processes occurring in the digestive tract of all vertebrates. A disturbance of microbial balance may lead to disorders in digestive processes. Due to the high demand for fish from aquaculture, many studies have focused on the microbiome of the digestive tract in these animals, especially synbiotic Lactobacillus bacteria, which play an extremely important and beneficial role in digestive processes. Research conducted in recent years has shown that many factors influence the microflora in fish, such as the surrounding environment, oxygenation, water temperature, food intake, antibiotics, chromium oxide, linoleic acid, and finally the development stage of the fish. The authors of the publication provide an overview of the current knowledge on the gastrointestinal microflora of Cyprinidae and its effect on their digestive processes. In this context information on the probiotic therapy in Cyprinidae was also presented.
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Abstrakt: Najwyzszymi formami ochrony przyrody w Polsce są parki narodowe i rezerwaty. Niezwykle istotnym elementem tych struktur są ekosystemy wodne. Jednym z negatywnych zjawisk, bedących konsekwencją nieprawidlowej ochrony wod i... more
Abstrakt: Najwyzszymi formami ochrony przyrody w Polsce są parki narodowe i rezerwaty. Niezwykle istotnym elementem tych struktur są ekosystemy wodne. Jednym z negatywnych zjawisk, bedących konsekwencją nieprawidlowej ochrony wod i ekosystemow wodnych jest rozprzestrzenianie gatunkow obcych w ichtiofaunie i wypieranie gatunkow rodzimych. Aby moc odpowiednio szybko zareagowac na tego typu zjawiska konieczny jest staly monitoring populacji ryb. Celem pracy jest porownanie czternastu parkow narodowych oraz trzech rezerwatow ichtiologicznych w Polsce pod wzgledem wystepujących w nich gatunkow ryb i minogow. Wyszczegolniono gatunki podlegające ochronie oraz gatunki obce w ichtiofaunie. Najwiecej gatunkow ryb (45) stwierdzono w Biebrzanskim Parku Narodowym. W Polsce wystepują 22 gatunki chronionych minogow i ryb. W analizowanych parkach stwierdzono wystepowanie lącznie 11 gatunkow chronionych. Najwiecej gatunkow chronionych (9) stwierdzono w Biebrzanskim Parku Narodowym.