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Dmitry Sendek

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Javier Alba-Tercedor

University of Granada

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Nguyen Thanh Vu

Pukyong National University, Korea

University of Copenhagen

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Fernando López Hernández

Apurba Ratan Ghosh

Universidad Autónoma del Estado de México

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Papers by Dmitry Sendek

Histology and Ultrastructure of the Nephron and Kidney Interstitial Cells in the Atlantic Salmon (Salmo salar Linnaeus 1758) at Different Stages of Life Cycle

Biology

This article presents data on the mesonephros histology and ultrastructure in the Atlantic salmon... more This article presents data on the mesonephros histology and ultrastructure in the Atlantic salmon from the Baltic Sea and Barents Sea populations, with an emphasis on comparisons between the following ontogenetic stages: parr, smolting, adult life at sea, the adults’ return to their natal river to spawn, and spawning. The ultrastructural changes in the renal corpuscle and cells of the proximal tubules of the nephron occurred as early as the smolting stage. Such changes reflect fundamental alterations during the pre-adaptation to life in saltwater. In the Barents Sea population, the adult salmon sampled in the sea had the smallest diameters of the renal corpuscle and proximal and distal tubules, the most narrow urinary space, and the thickest basement membrane. In the group of salmon that entered the mouth of the river and spent less than 24 h in freshwater, the structural rearrangements occurred only in the distal tubules. Better development of the smooth endoplasmic reticulum and a...

European smelt Osmerus eperlanus in the eastern Gulf of Finland, Baltic Sea: stock status and fishery

Journal of Fish Biology, 2019

In the eastern Gulf of Finland, European smelt Osmerus eperlanus occurs as an anadromous ecologic... more In the eastern Gulf of Finland, European smelt Osmerus eperlanus occurs as an anadromous ecological form that spawns in coastal, low-salinity zones and in several rivers entering the gulf, most importantly in the River Neva. Osmerus eperlanus is a key commercial fish species for the population of St. Petersburg, and the city's fish symbol. However, the state of the smelt stock has considerably deteriorated over the past few decades. Monitoring shows that annual catches during 1965-1992 averaged 2274 t, compared to 292 t in 2002-2017, although some improvement is inidicated by a gradual increase in catches in recent years (e.g., to 595 t in 2017). This paper addresses long-term and recent changes in the fisheries for smelt in the eastern Gulf of Finland, including both commercial and recreational fisheries, and the range of fishing gears used. The commercial smelt fishery is mainly conducted during the spawning period (April-May) on migrating fish, using trap nets of various designs and beach seines. There has been an increase in recreational fisheries for smelt; in years when ice cover on the gulf during winter (December-April) is steady, recreational fishers from St. Petersburg, using hook and line, may catch quantities that are comparable to those of commercial catches. Several factors may account for the stock dynamics and associated changes in catches of smelt: these include a decrease in prey availability in the gulf; loss and degradation of spawning and nursery habitats, partly associated with large-scale hydroengineering operations in Neva Bay; and illegal, unreported and unregulated (IUU) fishing which became widespread in post-Soviet decades. In spite of a gradual increase in smelt abundance in the most recent 15 years, a failure to accurately monitor and manage the extent of IUU and recreational fishing for smelt, to assess the status of the stock, or to forecast catches, increases the risk of overfishing of the spawning stock.

Ozerov_et_al_2015_Whitefish_PST-FST

Data from: Generation of a neutral FST baseline for testing local adaptation on gill-raker number within and between European whitefish ecotypes in the Baltic Sea basin

Microanatomy and ultrastructure of kidney interstitial cells and nephron in brown trout (Salmo trutta Linnaeus, 1758) at different stages of the life cycle

Canadian Journal of Zoology

The study focuses on the microanatomy and ultrastructural changes in the trunk kidney interstitiu... more The study focuses on the microanatomy and ultrastructural changes in the trunk kidney interstitium cells and nephrons in parr, smolt and spawning brown trout Salmo trutta Linnaeus, 1758 sampled in Luga River and Solka River, the tributaries of the Baltic Sea. Regardless of the type of cells or their structure, there were changes in their areas and the number and structure of organelles responsible for the transport, synthetic and energetic function of cells. Our data on the morphology of the nephron combined with data on its physiology suggest a fundamental change in kidney function during the parr-smolt transformation before migration; this could be a preadaptation for a successful life in saltwater where urine output is sharply reduced. Thus, detected structural features of the trunk kidney in brown trout S. trutta are cytological markers of the migration process. The numbers of lymphocytes, neutrophils and eosinophils with segmented nuclei increased from parr to smolts and then t...

Response to comments by Heikinheimo et al. (in press) on Hansson et al. (2018): competition for the fish—fish extraction from the Baltic Sea by humans, aquatic mammals, and birds

ICES Journal of Marine Science

As discussions and debates are crucial to science, we appreciate the comments by Heikinheimo et a... more As discussions and debates are crucial to science, we appreciate the comments by Heikinheimo et al. (in press) on our article on competition for Baltic Sea fish resources between fishery and wildlife. We cannot see that the comments by Heikinheimo et al. changes the general conclusion derived in our original article-that there are cases of competition between wildlife and fisheries in the Baltic Sea, although not for all species and not to the same extent everywhere. Our responses are structured in the same order as the comments by Heikinheimo et al.

Genetic differentiation of coregonid populations in Subarctic areas

Advances in Limnology

Dynamics of fish catches in the eastern Gulf of Finland (Baltic Sea) and downstream of the Neva River during the 20th century

Aquatic Sciences, 2014

ABSTRACT The paper describes changing patterns of commercial fish catch in the downstream part of... more ABSTRACT The paper describes changing patterns of commercial fish catch in the downstream part of the Neva River and the eastern Gulf of Finland and analyzes drivers of these changes for the period 1929–1995. We summarize catch data on 20 species and species groups of fishes and lamprey, as well as available abiotic data (salinity, temperature and water transparency). Water transparency gradually decreased during the 20th century being inseparable from a number of non-quantified anthropogenic factors, thus it can be used as an integral index of anthropogenic loading on the ecosystem. Because fisheries statistics were not published regularly, catch data were extracted from archives and various publications. Fishing locations, gear and target species changed over time in relation to each other, reflecting technological developments in fisheries, commercial demands for fishery products and the abundance of fish populations. Until the 18–19th centuries, fisheries took place mostly in rivers where weirs and set nets targeted sturgeon, salmon and whitefish. By the end of the 19th century, herring and smelt were the main targets of fixed nets in coastal areas. A century later, the main commercial species, herring, was harvested with pelagic trawls operating offshore in the Gulf. This evolution in fisheries, along with other anthropogenic activities, caused severe declines in diadromous species. Spawning migrations that make them easy to catch, and their high market value, make diadromous fish more vulnerable than other groups. Canonical correspondence analysis showed that catches of most diadromous species decreased with increasing transparency, which may reflect their response to anthropogenic pressure. Marine and freshwater fish suffered from anthropogenic pressure, but to a lesser extent probably because of a wider distribution and dispersal, and more capital-intensive fishing methods. Catches of marine species, except herring, significantly increased in the 1970–1980s when salinity was comparatively high. We found no correlation of fish catches with temperature.

Competition for the fish – fish extraction from the Baltic Sea by humans, aquatic mammals, and birds

ICES Journal of Marine Science

Seals and fish-eating birds have increased in the Baltic Sea and there is concern that they compe... more Seals and fish-eating birds have increased in the Baltic Sea and there is concern that they compete with fisheries. Using data from around year 2010, we compare consumption of different fish species by seals and birds to the catch in the commercial and recreational fishery. When applicable this is done at the geographical resolution of ICES subdivisions. Predation by birds and mammals likely has limited impact on the populations of the commercially most important species (herring, sprat, and cod). In the central and southern Baltic, seals and birds consume about as much flatfish as is caught by the fishery and competition is possible. Birds and seals consume 2-3 times as much coastal fish as is caught in the fishery. Many of these species are important to the fishery (e.g. perch and whitefish) and competition between wildlife and the fishery is likely, at least locally. Estimated wildlife consumption of pike, sea trout and pikeperch varies among ICES subdivisions and the degree of c...

Coregonine fisheries in the eastern Gulf of Finland, Baltic Sea: history and current status

Advances in Limnology

Land-locked Salmon in the Ladoga and Onego basins

The origin of sympatric forms of European whitefish (Coregonus lavaretus (L.)) in Lake Ladoga based on comparative genetic analysis of populations inNorth-West Russia

Annales Zoologici Fennici, 2004

Four sympatric forms of Lake Ladoga European whitefish (Coregonus lavaretus (L.)) were analyzed a... more Four sympatric forms of Lake Ladoga European whitefish (Coregonus lavaretus (L.)) were analyzed at 29 enzyme loci. The genetic distances between these populations were highest when the lake form and the lake-river form from the southern part of the lake (both of them low-density-rakered) were compared with two lake forms ("black" and "white") from the north-western coastal zone of Lake Ladoga (D N = 0.003-0.006). No genetic differences between the low-density-rakered "white" form and the medium-density-rakered "black" European whitefish were found. Analysis of allelic distribution and genetic divergence among European whitefish populations in North-West Russia failed to support the identity of the low-density-rakered forms of Lake Ladoga whitefish with eastern populations of C. lavaretus pidschian. Based on these data, the hypothesis of possible penetration of the White Sea coregonid fauna into Lake Ladoga can be rejected. A more plausible hyp...

Atlantic salmon in the Russian part of the Baltic Sea basin

The reasons of genetic heterogeneity of Siberian whitefish Coregonus lavaretus pidschian in the Anabar river

Ecological genetics, Oct 17, 2017

❀ В результате популяционно-генетического исследования сига-пыжьяна Coregonus lavaretus pidschian... more ❀ В результате популяционно-генетического исследования сига-пыжьяна Coregonus lavaretus pidschian Gmelin (р. Анабар) по 30 изоферментным локусам была обнаружена значительная генетическая неоднородность вида из разных участков реки. Наиболее вероятной причиной выявленной генетической дифференциации представляется заселение водотока независимыми филогенетическими линиями сига. В настоящее время филогенетические линии в р. Анабар сохраняют свою репродуктивную изоляцию и представлены симпатрически обитающими экологическими формами-восточносибирским и ледниково-равнинным сигами. Обсуждаются родственные отношения экологических форм сига р. Анабар с другими популяциями вида в Сибири и вероятные пути колонизации реки дискретными филогенетическими линиями сига.

Phylogenetic Relationships in Vendace and Least Cisco, and Their Distribution Areas in Western Eurasia

Annales Zoologici Fennici

Morphological and Genetic Variability of the Mass Whitefish Forms in Lake Onega

KnE Life Sciences

In Lake Onega, the whitefish Coregonus lavaretus has been shown to occur as a variety of forms. M... more In Lake Onega, the whitefish Coregonus lavaretus has been shown to occur as a variety of forms. Medium- and sparsely-ranked whitefish are most abundant. Analysis of available data indicates that whitefish populations from Karelia’s large lakes display the maximum values of various genetic variability indices. This fact seems to be due to the history of the colonization of the lake by the discrete evolutionary whitefish lineages from various Late Quaternary habitats followed by their hybridization. A great variety of Onega whitefish haplotypes is probably related to the genetic heterogeneity of the whitefish who until recently had occurred as five ecological forms ranking as subspecies. The median network obtained suggests that many of the populations studied have become less abundant. The well-defined “star-like” network structure is characteristic of populations that passed through a narrow “bottleneck” in the near past and then expanded rapidly, as indicated by the abundance of ra...

Morphological and Genetic Variability of the Mass Whitefish Forms in Lake Onega

KnE Life Sciences

In Lake Onega, the whitefish Coregonus lavaretus has been shown to occur as a variety of forms. M... more In Lake Onega, the whitefish Coregonus lavaretus has been shown to occur as a variety of forms. Medium- and sparsely-ranked whitefish are most abundant. Analysis of available data indicates that whitefish populations from Karelia’s large lakes display the maximum values of various genetic variability indices. This fact seems to be due to the history of the colonization of the lake by the discrete evolutionary whitefish lineages from various Late Quaternary habitats followed by their hybridization. A great variety of Onega whitefish haplotypes is probably related to the genetic heterogeneity of the whitefish who until recently had occurred as five ecological forms ranking as subspecies. The median network obtained suggests that many of the populations studied have become less abundant. The well-defined “star-like” network structure is characteristic of populations that passed through a narrow “bottleneck” in the near past and then expanded rapidly, as indicated by the abundance of ra...

Histology and Ultrastructure of the Nephron and Kidney Interstitial Cells in the Atlantic Salmon (Salmo salar Linnaeus 1758) at Different Stages of Life Cycle

Biology

This article presents data on the mesonephros histology and ultrastructure in the Atlantic salmon... more This article presents data on the mesonephros histology and ultrastructure in the Atlantic salmon from the Baltic Sea and Barents Sea populations, with an emphasis on comparisons between the following ontogenetic stages: parr, smolting, adult life at sea, the adults’ return to their natal river to spawn, and spawning. The ultrastructural changes in the renal corpuscle and cells of the proximal tubules of the nephron occurred as early as the smolting stage. Such changes reflect fundamental alterations during the pre-adaptation to life in saltwater. In the Barents Sea population, the adult salmon sampled in the sea had the smallest diameters of the renal corpuscle and proximal and distal tubules, the most narrow urinary space, and the thickest basement membrane. In the group of salmon that entered the mouth of the river and spent less than 24 h in freshwater, the structural rearrangements occurred only in the distal tubules. Better development of the smooth endoplasmic reticulum and a...

European smelt Osmerus eperlanus in the eastern Gulf of Finland, Baltic Sea: stock status and fishery

Journal of Fish Biology, 2019

In the eastern Gulf of Finland, European smelt Osmerus eperlanus occurs as an anadromous ecologic... more In the eastern Gulf of Finland, European smelt Osmerus eperlanus occurs as an anadromous ecological form that spawns in coastal, low-salinity zones and in several rivers entering the gulf, most importantly in the River Neva. Osmerus eperlanus is a key commercial fish species for the population of St. Petersburg, and the city's fish symbol. However, the state of the smelt stock has considerably deteriorated over the past few decades. Monitoring shows that annual catches during 1965-1992 averaged 2274 t, compared to 292 t in 2002-2017, although some improvement is inidicated by a gradual increase in catches in recent years (e.g., to 595 t in 2017). This paper addresses long-term and recent changes in the fisheries for smelt in the eastern Gulf of Finland, including both commercial and recreational fisheries, and the range of fishing gears used. The commercial smelt fishery is mainly conducted during the spawning period (April-May) on migrating fish, using trap nets of various designs and beach seines. There has been an increase in recreational fisheries for smelt; in years when ice cover on the gulf during winter (December-April) is steady, recreational fishers from St. Petersburg, using hook and line, may catch quantities that are comparable to those of commercial catches. Several factors may account for the stock dynamics and associated changes in catches of smelt: these include a decrease in prey availability in the gulf; loss and degradation of spawning and nursery habitats, partly associated with large-scale hydroengineering operations in Neva Bay; and illegal, unreported and unregulated (IUU) fishing which became widespread in post-Soviet decades. In spite of a gradual increase in smelt abundance in the most recent 15 years, a failure to accurately monitor and manage the extent of IUU and recreational fishing for smelt, to assess the status of the stock, or to forecast catches, increases the risk of overfishing of the spawning stock.

Ozerov_et_al_2015_Whitefish_PST-FST

Data from: Generation of a neutral FST baseline for testing local adaptation on gill-raker number within and between European whitefish ecotypes in the Baltic Sea basin

Microanatomy and ultrastructure of kidney interstitial cells and nephron in brown trout (Salmo trutta Linnaeus, 1758) at different stages of the life cycle

Canadian Journal of Zoology

The study focuses on the microanatomy and ultrastructural changes in the trunk kidney interstitiu... more The study focuses on the microanatomy and ultrastructural changes in the trunk kidney interstitium cells and nephrons in parr, smolt and spawning brown trout Salmo trutta Linnaeus, 1758 sampled in Luga River and Solka River, the tributaries of the Baltic Sea. Regardless of the type of cells or their structure, there were changes in their areas and the number and structure of organelles responsible for the transport, synthetic and energetic function of cells. Our data on the morphology of the nephron combined with data on its physiology suggest a fundamental change in kidney function during the parr-smolt transformation before migration; this could be a preadaptation for a successful life in saltwater where urine output is sharply reduced. Thus, detected structural features of the trunk kidney in brown trout S. trutta are cytological markers of the migration process. The numbers of lymphocytes, neutrophils and eosinophils with segmented nuclei increased from parr to smolts and then t...

Response to comments by Heikinheimo et al. (in press) on Hansson et al. (2018): competition for the fish—fish extraction from the Baltic Sea by humans, aquatic mammals, and birds

ICES Journal of Marine Science

As discussions and debates are crucial to science, we appreciate the comments by Heikinheimo et a... more As discussions and debates are crucial to science, we appreciate the comments by Heikinheimo et al. (in press) on our article on competition for Baltic Sea fish resources between fishery and wildlife. We cannot see that the comments by Heikinheimo et al. changes the general conclusion derived in our original article-that there are cases of competition between wildlife and fisheries in the Baltic Sea, although not for all species and not to the same extent everywhere. Our responses are structured in the same order as the comments by Heikinheimo et al.

Genetic differentiation of coregonid populations in Subarctic areas

Advances in Limnology

Dynamics of fish catches in the eastern Gulf of Finland (Baltic Sea) and downstream of the Neva River during the 20th century

Aquatic Sciences, 2014

ABSTRACT The paper describes changing patterns of commercial fish catch in the downstream part of... more ABSTRACT The paper describes changing patterns of commercial fish catch in the downstream part of the Neva River and the eastern Gulf of Finland and analyzes drivers of these changes for the period 1929–1995. We summarize catch data on 20 species and species groups of fishes and lamprey, as well as available abiotic data (salinity, temperature and water transparency). Water transparency gradually decreased during the 20th century being inseparable from a number of non-quantified anthropogenic factors, thus it can be used as an integral index of anthropogenic loading on the ecosystem. Because fisheries statistics were not published regularly, catch data were extracted from archives and various publications. Fishing locations, gear and target species changed over time in relation to each other, reflecting technological developments in fisheries, commercial demands for fishery products and the abundance of fish populations. Until the 18–19th centuries, fisheries took place mostly in rivers where weirs and set nets targeted sturgeon, salmon and whitefish. By the end of the 19th century, herring and smelt were the main targets of fixed nets in coastal areas. A century later, the main commercial species, herring, was harvested with pelagic trawls operating offshore in the Gulf. This evolution in fisheries, along with other anthropogenic activities, caused severe declines in diadromous species. Spawning migrations that make them easy to catch, and their high market value, make diadromous fish more vulnerable than other groups. Canonical correspondence analysis showed that catches of most diadromous species decreased with increasing transparency, which may reflect their response to anthropogenic pressure. Marine and freshwater fish suffered from anthropogenic pressure, but to a lesser extent probably because of a wider distribution and dispersal, and more capital-intensive fishing methods. Catches of marine species, except herring, significantly increased in the 1970–1980s when salinity was comparatively high. We found no correlation of fish catches with temperature.

Competition for the fish – fish extraction from the Baltic Sea by humans, aquatic mammals, and birds

ICES Journal of Marine Science

Seals and fish-eating birds have increased in the Baltic Sea and there is concern that they compe... more Seals and fish-eating birds have increased in the Baltic Sea and there is concern that they compete with fisheries. Using data from around year 2010, we compare consumption of different fish species by seals and birds to the catch in the commercial and recreational fishery. When applicable this is done at the geographical resolution of ICES subdivisions. Predation by birds and mammals likely has limited impact on the populations of the commercially most important species (herring, sprat, and cod). In the central and southern Baltic, seals and birds consume about as much flatfish as is caught by the fishery and competition is possible. Birds and seals consume 2-3 times as much coastal fish as is caught in the fishery. Many of these species are important to the fishery (e.g. perch and whitefish) and competition between wildlife and the fishery is likely, at least locally. Estimated wildlife consumption of pike, sea trout and pikeperch varies among ICES subdivisions and the degree of c...

Coregonine fisheries in the eastern Gulf of Finland, Baltic Sea: history and current status

Advances in Limnology

Land-locked Salmon in the Ladoga and Onego basins

The origin of sympatric forms of European whitefish (Coregonus lavaretus (L.)) in Lake Ladoga based on comparative genetic analysis of populations inNorth-West Russia

Annales Zoologici Fennici, 2004

Four sympatric forms of Lake Ladoga European whitefish (Coregonus lavaretus (L.)) were analyzed a... more Four sympatric forms of Lake Ladoga European whitefish (Coregonus lavaretus (L.)) were analyzed at 29 enzyme loci. The genetic distances between these populations were highest when the lake form and the lake-river form from the southern part of the lake (both of them low-density-rakered) were compared with two lake forms ("black" and "white") from the north-western coastal zone of Lake Ladoga (D N = 0.003-0.006). No genetic differences between the low-density-rakered "white" form and the medium-density-rakered "black" European whitefish were found. Analysis of allelic distribution and genetic divergence among European whitefish populations in North-West Russia failed to support the identity of the low-density-rakered forms of Lake Ladoga whitefish with eastern populations of C. lavaretus pidschian. Based on these data, the hypothesis of possible penetration of the White Sea coregonid fauna into Lake Ladoga can be rejected. A more plausible hyp...

Atlantic salmon in the Russian part of the Baltic Sea basin

The reasons of genetic heterogeneity of Siberian whitefish Coregonus lavaretus pidschian in the Anabar river

Ecological genetics, Oct 17, 2017

❀ В результате популяционно-генетического исследования сига-пыжьяна Coregonus lavaretus pidschian... more ❀ В результате популяционно-генетического исследования сига-пыжьяна Coregonus lavaretus pidschian Gmelin (р. Анабар) по 30 изоферментным локусам была обнаружена значительная генетическая неоднородность вида из разных участков реки. Наиболее вероятной причиной выявленной генетической дифференциации представляется заселение водотока независимыми филогенетическими линиями сига. В настоящее время филогенетические линии в р. Анабар сохраняют свою репродуктивную изоляцию и представлены симпатрически обитающими экологическими формами-восточносибирским и ледниково-равнинным сигами. Обсуждаются родственные отношения экологических форм сига р. Анабар с другими популяциями вида в Сибири и вероятные пути колонизации реки дискретными филогенетическими линиями сига.

Phylogenetic Relationships in Vendace and Least Cisco, and Their Distribution Areas in Western Eurasia

Annales Zoologici Fennici

Morphological and Genetic Variability of the Mass Whitefish Forms in Lake Onega

KnE Life Sciences

In Lake Onega, the whitefish Coregonus lavaretus has been shown to occur as a variety of forms. M... more In Lake Onega, the whitefish Coregonus lavaretus has been shown to occur as a variety of forms. Medium- and sparsely-ranked whitefish are most abundant. Analysis of available data indicates that whitefish populations from Karelia’s large lakes display the maximum values of various genetic variability indices. This fact seems to be due to the history of the colonization of the lake by the discrete evolutionary whitefish lineages from various Late Quaternary habitats followed by their hybridization. A great variety of Onega whitefish haplotypes is probably related to the genetic heterogeneity of the whitefish who until recently had occurred as five ecological forms ranking as subspecies. The median network obtained suggests that many of the populations studied have become less abundant. The well-defined “star-like” network structure is characteristic of populations that passed through a narrow “bottleneck” in the near past and then expanded rapidly, as indicated by the abundance of ra...

Morphological and Genetic Variability of the Mass Whitefish Forms in Lake Onega

KnE Life Sciences

In Lake Onega, the whitefish Coregonus lavaretus has been shown to occur as a variety of forms. M... more In Lake Onega, the whitefish Coregonus lavaretus has been shown to occur as a variety of forms. Medium- and sparsely-ranked whitefish are most abundant. Analysis of available data indicates that whitefish populations from Karelia’s large lakes display the maximum values of various genetic variability indices. This fact seems to be due to the history of the colonization of the lake by the discrete evolutionary whitefish lineages from various Late Quaternary habitats followed by their hybridization. A great variety of Onega whitefish haplotypes is probably related to the genetic heterogeneity of the whitefish who until recently had occurred as five ecological forms ranking as subspecies. The median network obtained suggests that many of the populations studied have become less abundant. The well-defined “star-like” network structure is characteristic of populations that passed through a narrow “bottleneck” in the near past and then expanded rapidly, as indicated by the abundance of ra...