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Background. Considerable amounts of fish bones and scales were discovered in 1953-1963, in an archaeological excavation pit situated in a former Vegetable Market in Szczecin, on the left bank of River Odra. Materials and Methods. Bone remains comprising 725 labelled collections from various dated sediment layers were identified. Individual bones were compared to those of corresponding extant fish...
Background. There is still a widespread notion that bony fishes with high fecundities are more productive and therefore more resistant to overexploitation. The purpose of this study was to formally explore the relationship between fecundity and reproductive success expressed as maximum annual reproductive rate, i.e. the number of new spawners produced by existing spawners at low population densities...
Background. The study was carried out in the shallow, eutrophic Oświn Lake, in the area of the Seven Islands ornithological reserve (north-eastern Poland) to determine the infection of fish with digeneans maturing in piscivorous birds. This paper presents a comparative analysis of the occurrence of Posthodiplostomum cuticola in fish from two parts of the reservoir differing in environmental conditions...
Bluespotted cornetfish, Fistularia commersonii Rüppell, 1838 is a Lessepsian migrant, recorded for the first time in the Mediterranean in Israeli waters in 2000 and two years later off Rhodes Island, south-eastern Aegean Sea. The presently described case of e single specimen constitutes the first record of its northernmost appearance, caught with trammel-nets in the waters off Loutra Agias Paraskevis...
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, in waters of different parameters indicates that this is a particularly plastic species. Recent implementation of new fish-processing machinery has increased dramatically the economical importance of ruffe,...
Background. In case of natural hybridisation of fish it is important to determine whether the hybrids attain sexual maturity and whether they can produce generation F2. The hybrids of rudd and carp bream, relatively frequent under natural conditions, have not been studied in the aspect of sexual maturity attainment. Materials and Methods. Histological examinations of gonads of 4-5 year old rudd and...
Background. The previous survey on parasites of ide in Poland was carried out in 1987 and there has been no data available on the parasites of this fish from areas in Poland west of the Vistula River. The aim of the present study was to survey the parasite fauna of ide, Leuciscus idus in Lake Dąbie and to compare the. Materials and Methods. Standard parasitological procedures were applied to 110 individuals...
Background. Fish farming has been developed due to decline of traditional fishing where tilapia culture is one of the principal sources for fish production. This study was aimed to investigate the prevalence and impact of helminth infection on the health of cultured hybrid tilapia, Oreochromis sp. Materials and Methods. Prevalence and intensity of helminth infection and histopathological response...
Background. Some heavy metals are essential to living organisms but their excess can disturb the homeostasis of an animal. The aim of the study was to assess effects of nickel compounds on carp, Cyprinus carpio L., and to follow the toxicodynamics of this metal elimination from intoxicated fish once they were transferred to a clean ambience. Materials and Methods. Individuals of carp, Cyprinus carpio...
Background. Due to its economical importance the vendace has been considered one of the most important items of the ichthyofauna of Polish lakes. This is mainly because of favourable biological features of this species, namely: short (2-3 years) period of attaining market size, relatively fast growth rate, schooling behaviour facilitating catches, and most of all the high meat value, making it a desirable...
Background. The use of anaesthetics in aquaculture requires conducting specific studies of their effects on fish. The objective of this study was to evaluate the effects of Propiscin (Polish agent containing etomidate) on common carp behaviour, heart rate, and ventilation. Materials and Methods. Carp were anaesthetised with Propiscin at the concentrations of 1 and 2 mlּl-1. An electrocardiograph was...
Background. The use of anaesthetics in aquaculture requires conducting specific physiological studies of its effect on fish. The objective of this study was to evaluate the direct effect of Propiscin (IRS Olsztyn, Poland) on the rate of isolated heart of common carp. Materials and Methods. The activity of isolated, perfused heart was recorded using an electrocardiograph. Propiscin was applied at concentrations...
Background. Usage of biosciences in increasing fish production needs to have a proper understanding and knowledge of endocrine physiology of fish reproduction. The most suitable method of determining the reproductive cycle in fishes is to observe seasonal development changes in the gonads. The present paper describes morphological changes in gonads of Mystus montanus. Materials and Methods. The individuals...
Background. Like in most salmonids, females of Artic charr dig nests, while spawning, to deposit their eggs, while the role of males is most often limited to the territorial defence. The aim of this study was to examine the histological structure of skin in both sexes, in the body parts which are particularly exposed to mechanical damage during spawning. Materials and Methods. Based on material representing...
Background. Because of the advancement of multiple spawning of carps, the importance of a quality larval diet is increasing day by day. The larval fish do not have the necessary enzyme or the amount of digestive enzymes to digest feed at optimum level. Therefore, fermentation of feed ingredients and/or formulated diets by bacterial enzymes to produce simpler forms of nutrients may be beneficial for...
Background. Chemical substances, including heavy metals, introduced into aquatic ecosystem can disturb the homeostasis of a habitat. The aim of this study was to assess the effects of cadmium compounds on common carp, Cyprinus carpio L. and to follow the toxicodynamics of cadmium elimination from intoxicated fish once they were transferred to a clean ambience. Materials and Methods. Common carp were...
Background. Grass pea, Lathyrus sativus is a widely available grain legume that contains a variety of anti-nutritional factors (ANFs). The aim of the present study was to determine the effects of feeding rohu, Labeo rohita, fingerlings with diets containing raw or extruded grass pea seed meal on growth, feed utilization efficiency, and carcass composition. Materials and Methods. Extrusion of finely...
Background. The hitherto published records of the parasite fauna of Baltic cod, Gadus morhua callarias cover commercially-caught adult fish. The aim of this study was to determine the composition of the parasite fauna of young Baltic cod, the relevant infection parameters and to relate those data to published records on the diet of cod. Materials and Methods. This survey was carried out on 154 young...
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