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1

Age and growth rate of pikeperch in the Pomeranian Bay in 1998

100%
Szypula J.
Electronic Journal of Polish Agricultural Universities. Series Fisheries
|
1998
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tom 01
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nr 1
A total of 150 pikeperch individuals caught in 1998 in the Pomeranian Bay were examined. The fish were picked out from 4 samples: 3 were obtained in March and 1 in April 1998. The standard methods of length and weight growth rate determination were used. When determining fish age, the verge coefficient was factored in (if Kr > 0.50, 1 was added to the scale annual ring count).
2

Age, growth, and condition of perch in the Odra Estuary

100%
Szypula J., Rybczyk A.
Folia Universitatis Agriculturae Stetinensis. Piscaria
|
2001
|
tom 28
3

Selected biological characteristics of the catch-available part of population of vendace, Coregonus albula [L.] from Lake Miedwie, Poland

84%
Czerniejewski P., Filipiak J., Poleszczuk G., Wawrzyniak W.
Acta Ichthyologica et Piscatoria
|
2004
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tom 34
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nr 2
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 consumer item. Materials and Methods. Biological characters were determined in 451 vendace from Lake Miedwie, caught in spring, (124 individuals), summer (132), late summer (87), and autumn (108). The age and growth rates of the fish were determined based on scales using commonly accepted methods. Fulton- and Clark coefficients were used to determine the fish condition. Results. The fish caught were 180-294 mm-long (TL) and weighed 45.2-176.3 g. Mean values of the Fulton coefficient indicated a pronounced improvement in the fish condition from spring to later summer (0.70 and 0.80, respectively) and a slight reduction in autumn (0.75). The age composition of the fish was as follows: 1+, 213 individuals (47.2%); 2+, 229 ind. (50.8%); 3+, 9 ind. (2.0%). The von Bertalanffy equations that describe theoretical growth of the fish examined in length (Lt) and weight (Wt), were calculated. Conclusion. According to the generally accepted criteria of the vendace growth rate, the Lake Miedwie individuals showed a very good growth, higher than that recorded in populations inhabiting other whitefish lakes of Polish Western Pomerania, which indicates the availability of appropriate food resources for the vendace in the Miedwie.
4

Age, growth, and condition of perch in the Szczecin Lagoon

84%
Szypula J.
Electronic Journal of Polish Agricultural Universities. Series Fisheries
|
2000
|
tom 03
|
nr 2
The study involved analysis, performed with standard methods, of length and weight growth of 202 perch individuals caught in November 1999 from the Szczecin Lagoon. The verge coefficient was factored in both when determining the age distribution and when analysing length and weight growth by calculating mean values in age groups (when Kr > 0.50, the number of annual rings was increased by 1).
5

Age, growth, and condition of pikeperch in the Odra Estuary [1995-2000]

67%
Szypula J.
Acta Scientiarum Polonorum. Piscaria
|
2002
|
tom 01
|
nr 1
6
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Parasite fauna of the eel, Anguilla anguilla [Linnaeus, 1758], from the Polish part of the Vistula Lagoon

67%
Rolbiecki L., Rokicki J.
Wiadomości Parazytologiczne
|
2006
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tom 52
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nr 2
Introduction. Eel is one of the most valuable commercial fish species of the Vistula Lagoon. For this reason its infection by non-indigenous species of parasites is the subject of the interest of sciencists. Material and methods. A total of 90 eel specimens caught in the Polish part of the Vistula Lagoon were examined over the period of May-August 2005. The fish were subjected to standard procedures of parasitological examination and parasite identification. The fish were divided into two length classes: smaller and larger than 50 cm. To assess the effects of parasites on fish condition, the Fulton coefficient, expressed with the formula: WF = G · L⁻³ x 100, was calculated. Results. The fish were found to be hosts to 17 parasite taxa. The Ciliophora were represented by Trichodinella epizootica (Raabe, 1950); the Myxozoa by Myxidium giardi Cépede, 1906; the Digenea by Bunodera luciopercae (Müller, 1784), Deropristis inflata (Molin, 1859), Diplostomum spp., and Ichthyocotylurus platycephalus (Creplin, 1852); the Cestoda by Bothriocephalus claviceps (Goeze, 1782), Proteocephalus macrocephalus (Creplin, 1815), and Proteocephalus sp.; the Nematoda by Anguillicola crassus Kuwahara, Niimi et Itagaki, 1974, Camallanus lacustris (Zoega, 1776), C. truncatus (Rudolphi, 1814), and Hysterothylacium aduncum (Rudolphi, 1802); the Acanthocephala by Acanthocephalus lucii (Müller, 1776) and Corynosoma strumosum (Rudolphi, 1802); the Hirudinea by Piscicola geometra (Linnaeus, 1761); and the Copepoda by Ergasilus sieboldi Nordmann, 1832. All fishes were infected, and the mean intensity of all parasites was 4.8 inds. The nematode Anguillicola crassus was the most frequent parasite (67.8%, 4.2 inds), represented by all developmental stages, but mostly by adult specimens. The fish condition coefficient was somewhat higher in the eel larger than 50 cm (0.1746) than in those smaller than 50 cm (0.1734); in addition, only Anguillicola crassus-free fish showed a higher condition coefficient (0.1861), compared to the infected specimens (0.1715).
7

Dry diet-influenced growth, size variability, condition and body deformities in juvenile crucian carp Carassius carassius L. reared under controlled conditions

67%
Myszkowski L., Kaminski R., Quiros M., Stanny L. A., Wolnicki J.
Archives of Polish Fisheries
|
2002
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tom 10
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nr 1
The growth, size variability, condition coefficient and percentage of fish with external deformities were compared in juvenile crucian carp (initially 31 mm TL and 0.36 g BW) which were fed intensively four starters only for 120 days at 25ºC. The best weight gain was achieved by fish fed an experimental carp diet with the lowest fat content (7.4%) and a commercial diet for eel containing 15.9% fat (4.33 and 4.15 g BW, respectively). In contrast to the experimental diets, both commercial diets produced fish with high condition coefficient values and a very high (37.2 or 62.7%) percentage of individuals with different external deformities. Size variability did increase over the course of the experiment except in the fish fed the high-energy diet for eel. Survival rates ranged between 96.5 and 99.5%. Our results indicate that juvenile crucian carp can be successfully reared exclusively on dry diets but not the commercial ones for eel or carp used in the present experiment.
8

Growth rate and condition of vimba, Vimba vimba (Actinopterygii: Cypriniformes: Cyprinidae), a species under restitution in the Odra River estuary

59%
Czerniejewski P., Rybczyk A., Tanski A., Keszka S., Antoszek A.
Acta Ichthyologica et Piscatoria
|
2011
|
tom 41
|
nr 3
Background. The majority of European populations of vimba, Vimba vimba (L.), have been classified into increasing categories of conservation status while Polish populations of this fish are classified as CR (critically endangered) and in fact they are facing extinction. In many rivers in Poland, including the Odra River, restitution efforts of vimba have been undertaken. Monitoring some biological parameters of the population such as the rate of growth (increase in mass and length), age structure, sex structure, and condition nay help to evaluate the success rate of the restitution efforts. Materials and methods. In total, 210 individuals of vimba, caught in the waters of the southern part of the Odra River estuary, mainly in Lake Dąbie, between 28 May 2007 and 30 June 2008 were studied as to their age, condition, rate of growth in mass and length. Making use of the linear R–L dependence, the back calculations were made according to the Rosa Lee procedure with a standard of 20 mm. Results were approximated by 5 mathematical models of growth proposed by von Bertalanffy, Ford–Walford, Gompertz, and based on second degree polynomial function and modified power function. Increase in mass was described by a modified von Bertalanffy equation. The condition of the fish was described by the Fulton (K) and Le Cren (Lc) formulae. Results. Females dominated in the material studied, they constituted over 61% of all individuals. In the age structure groups, females were most often found in groups: 10+ (13.33%), 9+, and 11+ (12.86% each). Males were found in the greatest number among 5-, 6-, and 7-year-old fish (4+, 5+, and 6+, respectively). The mean standard length and mass of the vimba fish studied were 306.33 mm and 286.02 g, respectively. The annual increase in length of the fish approximated 20 mm, being the most intense in the first two years of life (23–24 mm). Fulton and Le Cren coefficients of condition were 0.93 and 1.64 and the ranges of these values were 0.69–1.47 and 1.15–2.60, respectively. Conclusion. Analysis of back readings and empirical results proved that the growth of vimba was best approximated by the von Bertalanffy model. Comparative analysis of condition coefficients of the population of vimba in the Odra River estuary and other populations showed that the condition of analysed vimba population in individual years of live was lower.
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