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Background. Aparasitological survey was carried out in a shallow, eutrophic Oświn Lake (north-eastern Poland), within the Seven Islands ornithological reserve. We intended to compare the occurrence of eyeflukes in fish from two, distinctly demarcated pools of the lake, differing in environmental conditions. The effect of fish size and sampling season on the infection parameters was analysed and the...
Background. Fertilizer application is considered a viable low-cost method of sustainable aquaculture production. This study was carried out to investigate the growth response of north African catfish, Clarias gariepinus (Burchell, 1822), fry to inorganic- (NPK) and organic (cow dung and poultry dropping) fertilizers. Materials and Methods. Catfish fry (0.05–0.06 g) were transferred for six weeks into...
Background. Enormous diversities exist regarding shape, number, and arrangement of the olfactory lamellae, distribution of the sensory and non-sensory epithelium as well as the abundance of various receptor cells among different teleosts. This study was aimed at describing the morphology, histology and SEM ultrastructure of the olfactory epithelium of a spotted snakehead fish, Channa punctatus (Bloch,...
Introduction. Single intraperitoneal injections of sublethal doses of cadmium (10 µg Cd·kg-1 body weight) and nickel (60 µg Cd·kg-1 body weight) were administered to carp, Cyprinus carpio L., to determine detoxification potential of the fish affected after transfer to a clean milieu, as revealed by haematological parameters. Observation of haematological parameters allows the most rapid detection...
Scale deformity in Nile tilapia, Oreochromis niloticus, (Actinopterygii: Cichlidae) is reported for the first time from Dongola, north of Sudan. The abnormal scales are fused pairs, with two well-developed foci. Developmental irregularity, probably caused by partially arrested growth, is believed to be the cause of such deformity.
Background. Arctic charr, Salvelinus alpinus (L.), are known to harbour significantly more sea lice, Caligus elongatus von Nordmann, 1832, than do Atlantic salmon, Salmo salar L. This research investigated whether this is due to differences in initial infection or to resettlement/loss of mobile adults. Skin mucus protein profiles and epidermal histology were also studied as two characteristics that...
Background. The more than 10-metre deep archaeological site called the Vegetable Market (Kraut Markt), located near the Pomeranian Dukes’ Castle in Szczecin, was explored in 1953–1964. The site was found to contain 20 early-medieval sediment layers and a layer overlying the basement consisting of riverine mud. Historically, the layers spanned a period from the second decade of the 10th to the beginning...
Background. It is a common perception that growth rates of many commercially-exploited fish species have been well known. It is evident, however, that in certain cases, especially in brackish water environments those growth rates may be diversified. Therefore, determination of growth patterns of various stocks of the same fish, living in different salinity regimes may be important for efficient fisheries...
Background. The zope (blue bream), Abramis ballerus (L., 1758), is a cyprinid fish without economic importance, and its morphology has been poorly known. The monophyly of the genus Abramis is still unclear; therefore any new contribution to the knowledge on the morphology of zope could shed a new light on the phylogeny of this group of fishes. The aim of the present study was to learn and describe...
Background. Melatonin regulates various physiological and neuroendocrinological processes that occur rhythmically, and stimulates or inhibits endocrine activity of various body glands. This acts on the hypothalamic-pituitary-gonadal axis by synchronizing animals with their reproductive cycles. The proximity of melatonin receptors and dopamine and gonadoliberin production sites has led to a hypothesis...
Background. Rearing larval fish under laboratory conditions requires the use of appropriate artificial diets that fully replace natural food. Up till now, no starter has been developed for cyprinid rheophilic fish larvae, and these fish are therefore fed diets developed for other fish species. The present study was undertaken to evaluate the effects of diets of different protein-, lipid-, and fatty...
Background. Linseed and its by-products constitute a major source of dietary protein, but due to amino-acid imbalance and presence of anti-nutritional factors their use in fish feed is limited. Therefore, fermentation of linseed by lactic acid bacteria and/or fermented diets increases the level of linseed inclusion into the diet of rohu fingerlings by up to 40 percentage points. Materials and Methods...
Background. Dietary carbohydrate use is a priority in aquaculture because of its low cost and high availability, especially for herbivorous and omnivorous fish. Gelatinization is a process that improves carbohydrate use. However, excess dietary carbohydrate may cause metabolic stress and cellular changes as fish inherently use low carbohydrate. The aim of this study was to determine the effects of...
Background. Yeast extract powder (YEP) is a rich source of several B vitamins and is used mainly in bacterial culture. In the present study, the effect of dietary supplementation of YEP on growth, feed conversion, nutrient ADC, body composition, and digestive enzyme profile of rohu, Labeo rohita (Hamilton, 1822) fingerlings was evaluated. Materials and Methods. Rohu fingerlings (mean individual weight...
It is argued that Penicillus indicus Kumar et Hameed, 1993 represents two species; a member of Pennella Oken, 1815 (Pennellidae, Siphonostomatoida, Copepoda) with lepadid (Lepadidae, Lepadomorpha, Cirripedia) phoronts attached to its abdomen. This conclusion, while not founded on examination of the type and only specimens of P. indicus, seems robust based on observations that: 1) the species description...
Background. Fishes of the family Gobiidae may be definitive-, intermediate-, or paratenic hosts of parasites with mature stages infecting a variety of vertebrates, including humans. This group of fishes constitutes a convenient ecological model for studying the processes of colonisation by parasites. Learning these processes may contribute to a better, more complex, understanding of organismal interrelationships...
Background. The gudgeon is one of the most divergent fish species in Europe. Morphological variability related to sex, size, ecological characters, and geographical distribution are well documented in the literature. Apart from the only few data on the karyotype, chromosome banding patterns of this species have not been studied. Cytogenetic features are very useful tools in taxonomic descriptions...
Experiments were conducted to document behavioural responses of koi carp, Cyprinus carpio L., and goldfish, Carassius auratus (L.) to monoculture and polyculture conditions in aquaria. Two parallel experiments, otherwise involving similar experimental protocols, were carried out with two batches of fish, fed with live tubifex worm (first batch) and live zooplankton (second batch). Each of the trials,...
An adult male specimen of the offshore rockfish, Pontinus kuhlii (Bowdich, 1825), was caught off the coast of Alghero (NW Sardinia, Italy) in August 2004. That capture represents the second documented record of this Atlantic migrant in Italian waters, after more than a century from the first report. Furthermore, the new specimen is the largest specimen of this species ever recorded in the Mediterranean...
Background. Assessments of the efficacy of anaesthetics are usually based on observations of fish behaviour or changes in blood parameters. In this study we attempted to assess the process of anaesthesia, caused by MS-222, based on the measurement of heartbeat and respiratory frequency. Materials and Methods. The effect of four concentrations of MS-222 (75, 100, 125, and 150 mg · L-1) on heartbeat...
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