Seasonal variation of the metal (Zn, Fe, Mn) and metallothionein concentrations in the liver cytosol of the European chub (Squalius cephalus L.)

AbstractThe aim of the present study was to perform quantitative and qualitative evaluations of developing blood cells in the head kidney of European chub, Squalius cephalus (L.). Twenty-one types of hematopoietic precursors and mature cells were identified in head kidneys isolated from ten juvenile fish. The lymphoid lineage was the most abundant, followed by granuloid, erythroid, thrombocytoid, blast, and monocytoid cells. The lymphocyte was the most frequently occurring cell in the kidney and the most numerous of the lymphoid cells. The neutrophilic lineage was the most numerous among the granuloid cells. The erythropoietic series comprised five stages (erythroblasts: basophilic, polychromatic, orthochromatic; young and mature erythrocytes), more than the numbers of developmental stages of any other lineages. Juvenile cells were more abundant than mature stages in the head kidney. Only mature eosinophils and thrombocytes were found in chub hematopoietic tissue. The cellular composition in chub hematopoietic tissue was similar to that in other fish species.

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Distribution of Heavy Metals (Ni, Co, Pb, Cd, Hg) in Tissues of European Chub (Squalius cephalus L.) from the Middle Course of the Nitra River, Slovakia

Advanced Research in Life Sciences ◽

10.1515/arls-2018-0022 ◽

2018 ◽

Vol 2 (1) ◽

pp. 16-21

Author(s):

Jaroslav Andreji ◽

Petr Dvořák ◽

Martin Fik

Keyword(s):

Heavy Metals ◽

Permissible Limits ◽

European Chub ◽

Inner Organs ◽

Wet Weight ◽

Aas Method ◽

Squalius Cephalus

Abstract The aim of this study was to determine the levels of Ni, Co, Pb, Cd and Hg in the muscle, hepatopankreas, kidney and gonads of European chub (Squalius cephalus) from the middle course of the Nitra River, during spring and autumn seasons by AAS method. The concentrations of metals (mg.kg-1 wet weight) in the muscle ranged as follows: Ni 0.15-1.18, Co 0.09-0.58, Pb 0.39-1.66, Cd 0.04-0.29, Hg 0.85-2.71. Statistically significant differences among individual tissues, as well as between seasons have been recorded. Higher metals concentrations were detected in inner organs than in muscle. Permissible limits for safe consumption in the case of Pb, Cd and Hg have been exceeded in 100%, 95% and 100%, respectively. Currently, for the Co and Ni are not set any permissible limits.

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Detection of Squalius cephalus (Linnaeus, 1758), Carassius carassius (Linnaeus, 1758) and the khromist of Rutilus rutilus (Linnaeus, 1758) in the lower reaches of the Dnipro river in recent years

Biolohichni systemy ◽

10.31861/biosystems2019.02.167 ◽

2019 ◽

Vol 11 (2) ◽

pp. 167-173

Author(s):

Pavlo Tkachenko

Keyword(s):

Fish Fauna ◽

Rutilus Rutilus ◽

Whole Body ◽

Freshwater Species ◽

Carassius Carassius ◽

Lower Estuary ◽

Roach Rutilus Rutilus ◽

European Chub ◽

The Common ◽

Squalius Cephalus

The article presents the materials on the detection of two very rare species of fish: the European chub Squalius cephalus (Linnaeus, 1758) and the crucian carp (the golden carp) Carassius carassius (Linnaeus, 1758) in the waters of the lower estuary of the Dnipro river in recent years. C. carassius is listed in the Red Book of Ukraine (2009). The article also describes the first encounter in these waters with the khromist of the common roach Rutilus rutilus (Linnaeus, 1758), which has a yellow-golden colour of the whole body. The basin of the Lower Dnipro includes the Kakhovske reservoir, the Ingulets river, several small tributaries and the lower unregulated part of the Dnipro riverbed along with the straits. Over the entire period of observation, up to 72 species of the round-mouthed fish and the fish from 59 genera and 19 families have been spotted in the fish fauna of the Lower Dnipro basin. According to some data, it is stated that within the migratory and freshwater species of the round-mouthed fish and the fish of the Lower Dnipro's ichthyocenosis only 21 out of 47 species of the native fish fauna have survived here. In general, the current fish fauna of the unregulated part of the Lower Dnipro amounts to 51 species of fish. The habitat of 28 species of fish in the lower estuary of the Dnipro river was confirmed in 2019.

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