Pub Date : 2023-12-29DOI: 10.1134/s0032945224010132
D. G. Kim, H. Y. Soh, G. W. Baeck
Abstract
Feeding habits and trophic level of juvenile greater amberjack, Seriola dumerili were studied using 170 specimens collected by set net fishery and lure fishing in the southern waters of Korea during July, August, September, October, and November 2022. The size of juvenile greater amberjack ranged from 17.5 to 49.9 cm in fork length. Juvenile greater amberjack was piscivorous predator that feed primarily on fish. We calculated the trophic level as 4.06 ± 0.80 for juvenile greater amberjack. Fishes were the main prey items for all size groups. Juvenile greater amberjack also showed size-related dietary shift from Japanese anchovy to jack mackerel. As the fork length of juvenile greater amberjack increase, the mean weight of prey per stomach tended to increased, while the mean number of preys per stomach was not significantly different. Fishes were the main prey items for summer and autumn. The main fish prey during summer and autumn was Japanese anchovy, but in the autumn, the Japanese anchovy portion decreased, and the jack mackerel portion increased. PERMANOVA analysis was used to examine seasonal and size-related changes in diet composition, which showed significant variations among size classes. Juvenile greater amberjack presumably feed on larger prey to meet their energy requirements.
{"title":"Feeding Habits and Trophic Level of Juvenile Greater Amberjack, Seriola dumereili (Carangidae) in the Southern Waters of Korea","authors":"D. G. Kim, H. Y. Soh, G. W. Baeck","doi":"10.1134/s0032945224010132","DOIUrl":"https://doi.org/10.1134/s0032945224010132","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Feeding habits and trophic level of juvenile greater amberjack, <i>Seriola dumerili</i> were studied using 170 specimens collected by set net fishery and lure fishing in the southern waters of Korea during July, August, September, October, and November 2022. The size of juvenile greater amberjack ranged from 17.5 to 49.9 cm in fork length. Juvenile greater amberjack was piscivorous predator that feed primarily on fish. We calculated the trophic level as 4.06 ± 0.80 for juvenile greater amberjack. Fishes were the main prey items for all size groups. Juvenile greater amberjack also showed size-related dietary shift from Japanese anchovy to jack mackerel. As the fork length of juvenile greater amberjack increase, the mean weight of prey per stomach tended to increased, while the mean number of preys per stomach was not significantly different. Fishes were the main prey items for summer and autumn. The main fish prey during summer and autumn was Japanese anchovy, but in the autumn, the Japanese anchovy portion decreased, and the jack mackerel portion increased. PERMANOVA analysis was used to examine seasonal and size-related changes in diet composition, which showed significant variations among size classes. Juvenile greater amberjack presumably feed on larger prey to meet their energy requirements.</p>","PeriodicalId":48537,"journal":{"name":"Journal of Ichthyology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139067088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-29DOI: 10.1134/s0032945224010144
T. P. Malyshkina, M. V. Nazarkin, A. V. Solovyow
Abstract
An isolate tooth of a rare extinct hook-toothed mako Cosmopolitodus planus (Agassiz, 1856), discovered in the Lower Miocene deposits of the Chekhov Formation of Sakhalin Island is described. This extinct species was distributed exceptionally in the Pacific basin, and is known mainly from the deposits of the Middle and Upper Miocene. Thus, the described tooth is, probably, the oldest record of this species. The geographic and stratigraphic distribution of this species, as well as the validity of the genus Cosmopolitodus Glickman, 1964, are discussed.
{"title":"An Oldest Record of the Shark Cosmopolitodus planus (Lamnidae) from the Lower Miocene of the Sakhalin, Russia","authors":"T. P. Malyshkina, M. V. Nazarkin, A. V. Solovyow","doi":"10.1134/s0032945224010144","DOIUrl":"https://doi.org/10.1134/s0032945224010144","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>An isolate tooth of a rare extinct hook-toothed mako <i>Cosmopolitodus planus</i> (Agassiz, 1856), discovered in the Lower Miocene deposits of the Chekhov Formation of Sakhalin Island is described. This extinct species was distributed exceptionally in the Pacific basin, and is known mainly from the deposits of the Middle and Upper Miocene. Thus, the described tooth is, probably, the oldest record of this species. The geographic and stratigraphic distribution of this species, as well as the validity of the genus <i>Cosmopolitodus</i> Glickman, 1964, are discussed.</p>","PeriodicalId":48537,"journal":{"name":"Journal of Ichthyology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139066865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-14DOI: 10.1134/s0032945223050053
Yu. K. Kurbanov, A. V. Vinogradskaya
Abstract—
Based on the materials of bottom trawl surveys, the data are presented on the features of distribution, thermal conditions of habitats and the size composition of the white-blotched skate Bathyraja maculata in the northeastern Sea of Okhotsk during the hydrological summer of 1998–2019. The main aggregations of the species were found in the area of the eastern slope of the TINRO depression north of 56° N. The vertical distribution area covered depths of 60–874 m. The temperature range of the near-bottom layer of water at which the species was encountered was 0–3.0°С. High values of relative abundance were typical for depths of 401–500 and 601–700 m, for relative biomass, up to 500 m. Juveniles of white-blotched skate were found near the lower boundary of the habitat (> 600 m), and large individuals inhabited the shelf and adjacent areas of the continental slope. Presumably, one of the spawning grounds of the species is located on the eastern slope of the TINRO depression.
{"title":"Distribution, Ecology and Size Composition of the White-Blotched Skate Bathyraja maculata (Arhynchobatidae) in the Northeastern Sea of Okhotsk during the Hydrological Summer","authors":"Yu. K. Kurbanov, A. V. Vinogradskaya","doi":"10.1134/s0032945223050053","DOIUrl":"https://doi.org/10.1134/s0032945223050053","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\u0000<b>Abstract</b>—</h3><p>Based on the materials of bottom trawl surveys, the data are presented on the features of distribution, thermal conditions of habitats and the size composition of the white-blotched skate <i>Bathyraja maculata</i> in the northeastern Sea of Okhotsk during the hydrological summer of 1998–2019. The main aggregations of the species were found in the area of the eastern slope of the TINRO depression north of 56° N. The vertical distribution area covered depths of 60–874 m. The temperature range of the near-bottom layer of water at which the species was encountered was 0–3.0°С. High values of relative abundance were typical for depths of 401–500 and 601–700 m, for relative biomass, up to 500 m. Juveniles of white-blotched skate were found near the lower boundary of the habitat (> 600 m), and large individuals inhabited the shelf and adjacent areas of the continental slope. Presumably, one of the spawning grounds of the species is located on the eastern slope of the TINRO depression.</p>","PeriodicalId":48537,"journal":{"name":"Journal of Ichthyology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138629761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-14DOI: 10.1134/s0032945223060073
E. A. Kirillova, P. I. Kirillov
Abstract
New information on size composition, feeding, and spawning of Siberian stone loach Barbatula toni in a large watercourse in the northeast of Sakhalin Island is reported. The recorded maximal absolute body length and weight comprised 200 mm and 53.3 g, respectively. Predation and cannibalism in large fish specimens have been revealed.
{"title":"New Data on Biology of Siberian Stone Loach Barbatula toni (Nemacheilidae) in Langeri River (Sakhalin)","authors":"E. A. Kirillova, P. I. Kirillov","doi":"10.1134/s0032945223060073","DOIUrl":"https://doi.org/10.1134/s0032945223060073","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>New information on size composition, feeding, and spawning of Siberian stone loach <i>Barbatula toni</i> in a large watercourse in the northeast of Sakhalin Island is reported. The recorded maximal absolute body length and weight comprised 200 mm and 53.3 g, respectively. Predation and cannibalism in large fish specimens have been revealed.</p>","PeriodicalId":48537,"journal":{"name":"Journal of Ichthyology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138628885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-14DOI: 10.1134/s0032945223070111
A. O. Kasumyan, D. S. Pavlov
Abstract
In most fish species, the transition to a schooling lifestyle occurs soon after the start of exogenous feeding. The age at which juveniles begin to show schooling behavior differs in different species and is not related to the level of schooling in adults, i.e., their belonging to obligate or facultative schooling fish. In marine fish passing through the metamorphosis phase, schooling develops, as a rule, after the completion of this process. Among freshwater fish, juveniles living in rivers begin to show schooling behavior earlier than juveniles in stagnant waters. By the time a school is formed, the level of development of sensory systems and locomotion in juveniles is sufficient for intra-school contacts and schooling swimming. As juveniles grow, the coordination of schooling reactions and the ability to maintain the unity of a school during maneuvering increase. Compared to adult fish, schools of juveniles are less uniform in size and species composition.
{"title":"Development of Schooling Behavior in Fish Ontogeny","authors":"A. O. Kasumyan, D. S. Pavlov","doi":"10.1134/s0032945223070111","DOIUrl":"https://doi.org/10.1134/s0032945223070111","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In most fish species, the transition to a schooling lifestyle occurs soon after the start of exogenous feeding. The age at which juveniles begin to show schooling behavior differs in different species and is not related to the level of schooling in adults, i.e., their belonging to obligate or facultative schooling fish. In marine fish passing through the metamorphosis phase, schooling develops, as a rule, after the completion of this process. Among freshwater fish, juveniles living in rivers begin to show schooling behavior earlier than juveniles in stagnant waters. By the time a school is formed, the level of development of sensory systems and locomotion in juveniles is sufficient for intra-school contacts and schooling swimming. As juveniles grow, the coordination of schooling reactions and the ability to maintain the unity of a school during maneuvering increase. Compared to adult fish, schools of juveniles are less uniform in size and species composition.</p>","PeriodicalId":48537,"journal":{"name":"Journal of Ichthyology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138689737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-14DOI: 10.1134/s0032945223070159
A. O. Kasumyan, D. S. Pavlov
Abstract
The problems and prospects of studying schooling behavior of fish have been considered. Areas that remain little developed or have controversial and contradictory results have been noted: the hydrodynamics and energetics of fish swimming in a school, the mechanisms of fish interaction and the dissemination of information within a school, the principles of forming a coordinated school response to external stimuli and the rapid decay of the reaction, interaction between different schools during their collision or when being part of large aggregations of many schools, patterns of rapid change in the forms of a school. It has been shown that there are no clear ideas about the formation of mechanisms in the ontogeny of fish that underlie coordinated schooling behavior. The sensory base of schooling behavior requires further study. The origin and evolution of schooling behavior and the formation of emergent properties of a school based on individual actions of fish remain at the level of assumptions and hypotheses. The interspecies differences in the schooling behavior of fish, the interaction of schooling fish with fishing gear and adaptation to them are poorly studied. Attention has been drawn to the need for verification in nature of information obtained in laboratory conditions and on aquarium fish that have undergone selection. The necessity of using new technologies, devices, methods of mathematical modeling and other approaches for the intensification of experimental research has been emphasized. Knowledge of the schooling behavior of fish is important for elucidating the general patterns of social behavior of large associations of animals. The development of research is hampered by the lack of generally accepted terminology and quantitative criteria for schooling behavior, which would make it possible to adequately assess, compare, and analyze it. An exhaustive definition of a fish school has been given.
{"title":"Problems and Prospects of Studying Schooling Behavior of Fish","authors":"A. O. Kasumyan, D. S. Pavlov","doi":"10.1134/s0032945223070159","DOIUrl":"https://doi.org/10.1134/s0032945223070159","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The problems and prospects of studying schooling behavior of fish have been considered. Areas that remain little developed or have controversial and contradictory results have been noted: the hydrodynamics and energetics of fish swimming in a school, the mechanisms of fish interaction and the dissemination of information within a school, the principles of forming a coordinated school response to external stimuli and the rapid decay of the reaction, interaction between different schools during their collision or when being part of large aggregations of many schools, patterns of rapid change in the forms of a school. It has been shown that there are no clear ideas about the formation of mechanisms in the ontogeny of fish that underlie coordinated schooling behavior. The sensory base of schooling behavior requires further study. The origin and evolution of schooling behavior and the formation of emergent properties of a school based on individual actions of fish remain at the level of assumptions and hypotheses. The interspecies differences in the schooling behavior of fish, the interaction of schooling fish with fishing gear and adaptation to them are poorly studied. Attention has been drawn to the need for verification in nature of information obtained in laboratory conditions and on aquarium fish that have undergone selection. The necessity of using new technologies, devices, methods of mathematical modeling and other approaches for the intensification of experimental research has been emphasized. Knowledge of the schooling behavior of fish is important for elucidating the general patterns of social behavior of large associations of animals. The development of research is hampered by the lack of generally accepted terminology and quantitative criteria for schooling behavior, which would make it possible to adequately assess, compare, and analyze it. An exhaustive definition of a fish school has been given.</p>","PeriodicalId":48537,"journal":{"name":"Journal of Ichthyology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138689742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-14DOI: 10.1134/s0032945223070068
A. O. Kasumyan, D. S. Pavlov
Abstract
Ideas about the hydrodynamic and energetic benefits of swimming in a school have been considered. The reduction in energy cost for locomotion in a school is achieved due to the interference of microvortices generated by fish moving or staying in the current (hydrodynamic hypothesis of schooling swimming). The effect is most pronounced if the fish are of the same size, have similar locomotor capabilities, and show consistency when changing the mode or direction of swimming. It is also believed that the hydrodynamic effect of a school is realized only when partners in intra-school subgroups interact. Increased endurance of fish when in a school compared to single individuals has been experimentally confirmed. Energy costs for swimming while in a school can be lower by about 10–20%. Most of the fish that make long migrations are schooling fish, or form schools for the period of migration. Combining small schools into larger schools and school aggregations (mega-schools) facilitates finding optimal paths and improves the accuracy of migrations. Migration in schools reduces the vulnerability of fish to predators.
{"title":"Hydrodynamics and Energetics of Schooling Swimming and Migration of Schooling Fish","authors":"A. O. Kasumyan, D. S. Pavlov","doi":"10.1134/s0032945223070068","DOIUrl":"https://doi.org/10.1134/s0032945223070068","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Ideas about the hydrodynamic and energetic benefits of swimming in a school have been considered. The reduction in energy cost for locomotion in a school is achieved due to the interference of microvortices generated by fish moving or staying in the current (hydrodynamic hypothesis of schooling swimming). The effect is most pronounced if the fish are of the same size, have similar locomotor capabilities, and show consistency when changing the mode or direction of swimming. It is also believed that the hydrodynamic effect of a school is realized only when partners in intra-school subgroups interact. Increased endurance of fish when in a school compared to single individuals has been experimentally confirmed. Energy costs for swimming while in a school can be lower by about 10–20%. Most of the fish that make long migrations are schooling fish, or form schools for the period of migration. Combining small schools into larger schools and school aggregations (mega-schools) facilitates finding optimal paths and improves the accuracy of migrations. Migration in schools reduces the vulnerability of fish to predators.</p>","PeriodicalId":48537,"journal":{"name":"Journal of Ichthyology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138689739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-14DOI: 10.1134/s0032945223070020
A. O. Kasumyan, D. S. Pavlov
Abstract
The article opens a thematic issue of the Journal of Ichthyology, dedicated to Dmitry Viktorovich Radakov, a researcher who made an outstanding contribution to the knowledge of schooling behavior of fish. The article deals with many terms and concepts that are widely used in scientific publications on the schooling behavior of fish, but still do not have a generally accepted definition—crowd, aggregation, shoal, school, flock. Attention is drawn to the difficulties caused by the fact that the use of these terms is most often based not on objective criteria, but on the preferences, views or beliefs of individual researchers. General ideas about the prevalence of schooling behavior in fish of different taxonomy, lifestyle, condition and age; about the importance of the visual structuring of the environment for the manifestation of schooling, about the difficulty of dividing fish into facultative and obligate schooling, about the importance of knowledge about schooling behavior for solving applied problems have been considered.
{"title":"Schooling Behavior of Fish: General Ideas, Terms and Concepts, Prevalence, Applied Aspects","authors":"A. O. Kasumyan, D. S. Pavlov","doi":"10.1134/s0032945223070020","DOIUrl":"https://doi.org/10.1134/s0032945223070020","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article opens a thematic issue of the <i>Journal of Ichthyology</i>, dedicated to Dmitry Viktorovich Radakov, a researcher who made an outstanding contribution to the knowledge of schooling behavior of fish. The article deals with many terms and concepts that are widely used in scientific publications on the schooling behavior of fish, but still do not have a generally accepted definition—crowd, aggregation, shoal, school, flock. Attention is drawn to the difficulties caused by the fact that the use of these terms is most often based not on objective criteria, but on the preferences, views or beliefs of individual researchers. General ideas about the prevalence of schooling behavior in fish of different taxonomy, lifestyle, condition and age; about the importance of the visual structuring of the environment for the manifestation of schooling, about the difficulty of dividing fish into facultative and obligate schooling, about the importance of knowledge about schooling behavior for solving applied problems have been considered.</p>","PeriodicalId":48537,"journal":{"name":"Journal of Ichthyology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138689745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-14DOI: 10.1134/s0032945223060188
A. O. Zvezdin, A. V. Kucheryavyy, A. V. Kolotei, N. V. Polyakova, D. S. Pavlov
Abstract
Small freshwater (resident) populations of the European river lamprey Lampetrafluviatilis from an isolated from the sea upper part of a river system with numerous lakes (the upper reaches of tributaries of the Daugava River and Lake Peipus, Pskov Oblast, Russia) have been studied. Adult individuals of the lamprey have been attributed to common and large size groups; adults are similar to other resident lamprey from the Baltic Sea basin. The presence of larvae of different size and age groups indicates regular spawning of the European river lamprey in the studied watersheds. Analysis of the modern and historical (before the isolation) distribution of lamprey revealed a reduction in habitats and a decrease in the number of individuals. Dam-associated disruption of migration routes led to the disappearance of anadromous form, and consequently, disappearance of resident lamprey from most of the studied waterbodies. We attribute the decrease in the number of rivers inhabited by lamprey and abundance of the lamprey both to anthropogenic factors (direct blocking of an access of anadromous form of the lamprey to spawning grounds by hydraulic construction) and to the characteristics of the studied area. The richness of the river system with lentic waterbodies makes it suitable for lamprey inhabitation with an influx of large anadromous individuals capable of crossing such reservoirs in search of spawning sites.
{"title":"European River Lamprey Lampetra fluviatilis (Petromyzontidae) of the Pskov Lakeland: Current State of Isolated Populations","authors":"A. O. Zvezdin, A. V. Kucheryavyy, A. V. Kolotei, N. V. Polyakova, D. S. Pavlov","doi":"10.1134/s0032945223060188","DOIUrl":"https://doi.org/10.1134/s0032945223060188","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Small freshwater (resident) populations of the European river lamprey <i>Lampetra</i> <i>fluviatilis</i> from an isolated from the sea upper part of a river system with numerous lakes (the upper reaches of tributaries of the Daugava River and Lake Peipus, Pskov Oblast, Russia) have been studied. Adult individuals of the lamprey have been attributed to common and large size groups; adults are similar to other resident lamprey from the Baltic Sea basin. The presence of larvae of different size and age groups indicates regular spawning of the European river lamprey in the studied watersheds. Analysis of the modern and historical (before the isolation) distribution of lamprey revealed a reduction in habitats and a decrease in the number of individuals. Dam-associated disruption of migration routes led to the disappearance of anadromous form, and consequently, disappearance of resident lamprey from most of the studied waterbodies. We attribute the decrease in the number of rivers inhabited by lamprey and abundance of the lamprey both to anthropogenic factors (direct blocking of an access of anadromous form of the lamprey to spawning grounds by hydraulic construction) and to the characteristics of the studied area. The richness of the river system with lentic waterbodies makes it suitable for lamprey inhabitation with an influx of large anadromous individuals capable of crossing such reservoirs in search of spawning sites.</p>","PeriodicalId":48537,"journal":{"name":"Journal of Ichthyology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138627804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-14DOI: 10.1134/s0032945223060139
D. V. Prazdnikov
Abstract
The study of the effect of thyroid hormones on the development of the pigment pattern, including the expression of sexual dichromatism, contributes to our understanding of the role of endocrine signaling in the evolution of cichlid fishes, one of the most diverse groups of teleosts. This work shows the effect of reduced thyroid hormone signaling on the development of reversed sexual dichromatism in Amatitlania nigrofasciata, a Neotropical cichlid in which females, unlike males, have carotenoid coloration. In hypothyroid fishes, there was a slowdown in the rate of metamorphic transformations of the pigment pattern and an increase in phenotypic variability. The adult pattern based on carotenoids began to develop in females only after the completion of treatment of thiourea, which suppresses the synthesis of endogenous thyroid hormones. The data obtained indicate a potentially important role of thyroid hormone-mediated developmental plasticity in the diversification of carotenoid coloration in Neotropical cichlids.
{"title":"Influence of Hypothyroidism on the Variability of Carotenoid Coloration in Amatitlania nigrofasciata Females (Cichlidae)","authors":"D. V. Prazdnikov","doi":"10.1134/s0032945223060139","DOIUrl":"https://doi.org/10.1134/s0032945223060139","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The study of the effect of thyroid hormones on the development of the pigment pattern, including the expression of sexual dichromatism, contributes to our understanding of the role of endocrine signaling in the evolution of cichlid fishes, one of the most diverse groups of teleosts. This work shows the effect of reduced thyroid hormone signaling on the development of reversed sexual dichromatism in <i>Amatitlania nigrofasciata</i>, a Neotropical cichlid in which females, unlike males, have carotenoid coloration. In hypothyroid fishes, there was a slowdown in the rate of metamorphic transformations of the pigment pattern and an increase in phenotypic variability. The adult pattern based on carotenoids began to develop in females only after the completion of treatment of thiourea, which suppresses the synthesis of endogenous thyroid hormones. The data obtained indicate a potentially important role of thyroid hormone-mediated developmental plasticity in the diversification of carotenoid coloration in Neotropical cichlids.</p>","PeriodicalId":48537,"journal":{"name":"Journal of Ichthyology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138628069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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