Pub Date : 2024-02-11DOI: 10.1134/s0032945224020036
K. Karuppiah, K. Rajendran, Y. Mariasingarayan, C. P. Kumarasamy, K. Ethiraj
Abstract
Lethrinidae is one of the commercially important fish in India. The present study provides detailed morphometric, meristic characters and colour patterns of Monotaxis heterodon (Bleeker, 1854). The unique key characters of M. heterodon are having 24 vertebrae, the teeth patterns of both the jaws having molar teeth present in both jaws 4+3 but 6 canines in upper jaw and 4 canine teeth in lower jaw. Specifically, this species has dark brownish lips, no black spots at base of soft dorsal fin and 13 scale rows below lateral line to anal-fin origin. The COI gene sequence and phylogenetic analysis confirmed that Monotaxis heterodon and Monotaxis grandoculis were genetically distinct species and conform the distribution of M. heterodon in Indian Exclusive Economic Zone. In addition, molecular analysis using partial mitochondrial COI gene suggests that genetic distance within M. heterodon group was 0.32% of group mean distance between M. heterodon and M. grandoculis was 8.37%. Further, the present study revealed the range of extension of its known geographical distribution in addition to the ichthyofaunal biodiversity of southeast coast of India.
AbstractLethrinidae 是印度重要的商业鱼类之一。本研究提供了Monotaxis heterodon（Bleeker，1854 年）的详细形态计量、分身特征和颜色模式。M.heterodon的独特关键特征是有24个椎骨，两颚的牙齿形态为臼齿4+3，但上颚有6颗犬齿，下颚有4颗犬齿。具体来说，该物种的嘴唇呈黑褐色，软背鳍基部无黑斑，侧线以下至臀鳍起源处有 13 个鳞片排。COI 基因序列和系统发育分析证实异齿单棘鲷和大鳞单棘鲷在遗传学上是不同的物种，符合异齿单棘鲷在印度专属经济区的分布情况。此外，利用部分线粒体 COI 基因进行的分子分析表明，M. heterodon 组内的遗传距离为 0.32%，M. heterodon 和 M. grandoculis 组间的平均距离为 8.37%。此外，本研究揭示了其已知地理分布的扩展范围，以及印度东南沿海的鱼类生物多样性。
{"title":"First Record of Redfin Emperor Monotaxis heterodon (Lethrinidae) from Indian Waters with Molecular Confirmation","authors":"K. Karuppiah, K. Rajendran, Y. Mariasingarayan, C. P. Kumarasamy, K. Ethiraj","doi":"10.1134/s0032945224020036","DOIUrl":"https://doi.org/10.1134/s0032945224020036","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Lethrinidae is one of the commercially important fish in India. The present study provides detailed morphometric, meristic characters and colour patterns of <i>Monotaxis heterodon</i> (Bleeker, 1854). The unique key characters of <i>M. heterodon</i> are having 24 vertebrae, the teeth patterns of both the jaws having molar teeth present in both jaws 4+3 but 6 canines in upper jaw and 4 canine teeth in lower jaw. Specifically, this species has dark brownish lips, no black spots at base of soft dorsal fin and 13 scale rows below lateral line to anal-fin origin. The <i>COI</i> gene sequence and phylogenetic analysis confirmed that <i>Monotaxis heterodon</i> and <i>Monotaxis grandoculis</i> were genetically distinct species and conform the distribution of <i>M. heterodon</i> in Indian Exclusive Economic Zone. In addition, molecular analysis using partial mitochondrial <i>COI</i> gene suggests that genetic distance within <i>M. heterodon</i> group was 0.32% of group mean distance between <i>M. heterodon</i> and <i>M. grandoculis</i> was 8.37%. Further, the present study revealed the range of extension of its known geographical distribution in addition to the ichthyofaunal biodiversity of southeast coast of India.</p>","PeriodicalId":48537,"journal":{"name":"Journal of Ichthyology","volume":"81 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139754974","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 : 2024-02-11DOI: 10.1134/s0032945224020139
A. Sepil, F. Şen
Abstract
In this study, it was aimed to determine the larval ontogeny of Paraphanius mento (Heckel, 1843), which is distributed in Nemrut Crater Lake (Bitlis, Turkiye). Additionally, embryonic and larval development stages were evaluated microscopically and histologically. Filamentous and sticky fertilized eggs has a diameter of 1.251 ± 0.316 mm with the inclusion of 8−12 oil droplets have started to hatch approximately 11 days after spawning at 23.5°C. It was determined that newly hatched larvae have a total length of around 3.695 ± 0.225 mm (n = 20), have started exogenous feeding at 3 day after hatching and started to take particulate baits at the end of 10 day after hatching. Digestive tract differentiation, hepatopancreas, digestive tubes and gill arches formations were examined by taking histological sections in early life stages.
{"title":"Ontogeny of Larval Pearl-Spotted Killifish Paraphanius mento (Aphaniidae) Distributed in the Nemrut Crater Lake (Eastern Turkiye): A Histological and Microscopic Perspective","authors":"A. Sepil, F. Şen","doi":"10.1134/s0032945224020139","DOIUrl":"https://doi.org/10.1134/s0032945224020139","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In this study, it was aimed to determine the larval ontogeny of <i>Paraphanius mento</i> (Heckel, 1843), which is distributed in Nemrut Crater Lake (Bitlis, Turkiye). Additionally, embryonic and larval development stages were evaluated microscopically and histologically. Filamentous and sticky fertilized eggs has a diameter of 1.251 ± 0.316 mm with the inclusion of 8−12 oil droplets have started to hatch approximately 11 days after spawning at 23.5°C. It was determined that newly hatched larvae have a total length of around 3.695 ± 0.225 mm (<i>n</i> = 20), have started exogenous feeding at 3 day after hatching and started to take particulate baits at the end of 10 day after hatching. Digestive tract differentiation, hepatopancreas, digestive tubes and gill arches formations were examined by taking histological sections in early life stages.</p>","PeriodicalId":48537,"journal":{"name":"Journal of Ichthyology","volume":"13 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139754977","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 : 2024-02-01DOI: 10.1134/s0032945224010028
Abstract—
Tonlesapia tsukawakii Motomura et Mukai, 2006 is an endemic freshwater representative of the family Callionymidae (Teleostei: Perciformes: Callionymidei) living in the Mekong River. According to the materials of studies conducted in 2018–2022, the occurrence of the species in catches in the Mekong Delta averaged 20.7%, the proportion in terms of abundance was 2.6%, in terms of weight, 0.6%. The maximum values of the species parameters were 81.2 ind./effort and 176.2 g/effort, respectively. The abundance of fish significantly decreased in the conditions of low content of dissolved oxygen and on a substrate with plant residues. The sex ratio of T. tsukawakii was 1.0 : 3.1 with a stable prevalence of females, which distinguishes the species from other representatives of the family. Females have larger sizes compared to males and they gain weight faster. The fecundity of the species was determined for the first time; the average number of mature oocytes was 2950 psc. During a low-water period, callanoid copepods of the family Pseudodiaptomidae mainly represented by Pseudodiaptomus dauglishi Sewell, 1932 were the main food items of T. tsukawakii.
{"title":"Features of Biology of Tonlesapia tsukawakii (Actinopterygii, Callionymidae) in the Mekong Delta, Vietnam","authors":"","doi":"10.1134/s0032945224010028","DOIUrl":"https://doi.org/10.1134/s0032945224010028","url":null,"abstract":"<span> <h3>Abstract—</h3> <p><em>Tonlesapia tsukawakii</em> Motomura et Mukai, 2006 is an endemic freshwater representative of the family Callionymidae (Teleostei: Perciformes: Callionymidei) living in the Mekong River. According to the materials of studies conducted in 2018–2022, the occurrence of the species in catches in the Mekong Delta averaged 20.7%, the proportion in terms of abundance was 2.6%, in terms of weight, 0.6%. The maximum values of the species parameters were 81.2 ind./effort and 176.2 g/effort, respectively. The abundance of fish significantly decreased in the conditions of low content of dissolved oxygen and on a substrate with plant residues. The sex ratio of <em>T. tsukawakii</em> was 1.0 : 3.1 with a stable prevalence of females, which distinguishes the species from other representatives of the family. Females have larger sizes compared to males and they gain weight faster. The fecundity of the species was determined for the first time; the average number of mature oocytes was 2950 psc. During a low-water period, callanoid copepods of the family Pseudodiaptomidae mainly represented by <em>Pseudodiaptomus dauglishi</em> Sewell, 1932 were the main food items of <em>T. tsukawakii</em>.</p> </span>","PeriodicalId":48537,"journal":{"name":"Journal of Ichthyology","volume":"18 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140302210","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 : 2024-02-01DOI: 10.1134/s0032945224010107
Abstract—
Based on comparative morphological studies of weatherfishes (genus Misgurnus) collected in the Ili River basin (Kazakhstan) in 2022, specimens from the collection of the Zoological Museum of Lomonosov Moscow State University, and literature data, it is shown for the first time that the oriental weatherfish Misgurnus anguillicaudatus has naturalized in the Balkhash-Ili basin.
{"title":"Misgurnus anguillicaudatus (Cobitidae): a New Non-Native Species Naturalized in Water Bodies of the Balkhash-Ili Basin, Kazakhstan","authors":"","doi":"10.1134/s0032945224010107","DOIUrl":"https://doi.org/10.1134/s0032945224010107","url":null,"abstract":"<span> <h3>Abstract—</h3> <p>Based on comparative morphological studies of weatherfishes (genus <em>Misgurnus</em>) collected in the Ili River basin (Kazakhstan) in 2022, specimens from the collection of the Zoological Museum of Lomonosov Moscow State University, and literature data, it is shown for the first time that the oriental weatherfish <em>Misgurnus anguillicaudatus</em> has naturalized in the Balkhash-Ili basin.</p> </span>","PeriodicalId":48537,"journal":{"name":"Journal of Ichthyology","volume":"30 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140302250","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/s0032945224010168
E. D. Vasil’eva, V. P. Vasil’ev
Abstract
The conducted craniological analysis of Sabanejewia larvata and S. aurata did not reveal fundamental differences in the general morphology of the skull and skull bones between them. Comparison with previously studied Sabanejewia caspia, S. kubanica, S. caucasica, and S. aralensis showed that all investigated species have species-specific values for some craniological indices. Sabanejewia larvata and S. caspia are most similar and are characterized by the lowest skull in the ethmoid region, the widest praeoperculum, the ascending process of the dentary displaced anteriorly, and the narrowest cleithrum. The obtained results confirm the validity of the subgenus Andrzewia. At the same time, the observed craniological divergence of S. aurata and S. aralensis testifies in favor of an independent species status of the golden loach from the Aral Sea basin. However, further genetic and morphological studies are needed.
摘要 对Sabanejewia larvata和S. aurata进行的颅骨学分析没有发现它们之间在头骨和颅骨的总体形态上存在根本性差异。与之前研究过的 Sabanejewia caspia、S. kubanica、S. caucasica 和 S. aralensis 相比，所有被研究的物种在某些颅骨学指标上都具有物种特异性。Sabanejewia larvata 和 S. caspia 最为相似，其特点是头骨在乙状体区域最低，前胸最宽，齿状体的上升突向前移，蝶窦最窄。这些结果证实了 Andrzewia 亚属的有效性。同时，观察到的 S. aurata 和 S. aralensis 的颅骨分化也证明了咸海盆地金鳅的独立物种地位。不过，还需要进一步的遗传学和形态学研究。
{"title":"Craniological Features of Sabanejewia larvata (Cobitidae) and its Divergence from S. aurata and Other Congeneric Species","authors":"E. D. Vasil’eva, V. P. Vasil’ev","doi":"10.1134/s0032945224010168","DOIUrl":"https://doi.org/10.1134/s0032945224010168","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The conducted craniological analysis of <i>Sabanejewia larvata</i> and <i>S. aurata</i> did not reveal fundamental differences in the general morphology of the skull and skull bones between them. Comparison with previously studied <i>Sabanejewia caspia</i>, <i>S. kubanica</i>, <i>S. caucasica,</i> and <i>S. aralensis</i> showed that all investigated species have species-specific values for some craniological indices. <i>Sabanejewia larvata</i> and <i>S. caspia</i> are most similar and are characterized by the lowest skull in the ethmoid region, the widest praeoperculum, the ascending process of the dentary displaced anteriorly, and the narrowest cleithrum. The obtained results confirm the validity of the subgenus <i>Andrzewia</i>. At the same time, the observed craniological divergence of <i>S. aurata</i> and <i>S. aralensis</i> testifies in favor of an independent species status of the golden loach from the Aral Sea basin. However, further genetic and morphological studies are needed.</p>","PeriodicalId":48537,"journal":{"name":"Journal of Ichthyology","volume":"33 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139067345","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/s0032945224010156
N. K. Suyani, D. T. Vaghela, S. S. Rathore, B. Sureandiran
Abstract
The morphometric and meristic characteristics, length-length relationships (LLRs), length-weight relationships (LWRs) and relative condition factor of forty-one individuals of red cornetfish Fistularia petimba were studied for the first time from the North-West coast of India during February to September 2022. The maximum coefficient of variation was observed for inter-orbital length (25.85%) followed by lower jaw length (18.14%) and pectoral-fin length (16.96%). The morphometric index value was found <10% (genetically-controlled characters) for all the morphometric characters except total length with caudal filament length indicating restricted distribution. LLRs revealed isometric growth and high values of correlation coefficient (0.6109–0.9992). The b value of LWRs showed significant departure from 3 (p < 0.05) and hence negative allometric growth was recorded. The high R2 value of the LWRs indicates absolute fitness of the growth model and superior health status of the studied species. The mean condition factor value was calculated as 0.99 ± 0.04 indicating that the F. petimba population is in good health. Further, F. petimba is a reef-associated species forming a part of low-value bycatch which is mainly utilized for the preparation of fishmeal. Thus the provided morphometric and biometric information of the species will be useful for further biological, stock assessment and nutritional research in the region.
{"title":"First Report on Biometric Analysis of Red Cornetfish Fistularia petimba (Fistulariidae) from Indian Waters","authors":"N. K. Suyani, D. T. Vaghela, S. S. Rathore, B. Sureandiran","doi":"10.1134/s0032945224010156","DOIUrl":"https://doi.org/10.1134/s0032945224010156","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The morphometric and meristic characteristics, length-length relationships (LLRs), length-weight relationships (LWRs) and relative condition factor of forty-one individuals of red cornetfish <i>Fistularia petimba</i> were studied for the first time from the North-West coast of India during February to September 2022. The maximum coefficient of variation was observed for inter-orbital length (25.85%) followed by lower jaw length (18.14%) and pectoral-fin length (16.96%). The morphometric index value was found <10% (genetically-controlled characters) for all the morphometric characters except total length with caudal filament length indicating restricted distribution. LLRs revealed isometric growth and high values of correlation coefficient (0.6109–0.9992). The <i>b</i> value of LWRs showed significant departure from 3 (<i>p</i> < 0.05) and hence negative allometric growth was recorded. The high <i>R</i><sup>2</sup> value of the LWRs indicates absolute fitness of the growth model and superior health status of the studied species. The mean condition factor value was calculated as 0.99 ± 0.04 indicating that the <i>F. petimba</i> population is in good health. Further, <i>F. petimba</i> is a reef-associated species forming a part of low-value bycatch which is mainly utilized for the preparation of fishmeal. Thus the provided morphometric and biometric information of the species will be useful for further biological, stock assessment and nutritional research in the region.</p>","PeriodicalId":48537,"journal":{"name":"Journal of Ichthyology","volume":"36 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139066860","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/s0032945224010120
S. Gurkan, E. Taskavak, B. Taylan
Abstract
In this study, we aimed to state how we can contribute to an effective population management and protection by determining the morphometric characteristics of European yellow eels, Anguilla anguilla Linnaeus 1758, in the Aegean Sea population, Izmir Bay. It was found that the eye index and condition values of the female specimens are higher than those of the males. While it was determined that there was a significant difference between both sexes in 19 of 20 morphometric measurements of the head region, there was no statistical difference only in the height measurement at the nostril level of the head. In our study, the fact that specimens with ovaries were seen among the females longer than 34 cm (length group II) is remarkable in terms of early maturation in the region. The differences in head measurements between sexes indicate the existence of a dimorphic structure and these differences are in favor of female specimens.
{"title":"A Preliminary Study on the Morphometric Features of the European Eel, Anguilla anguilla (Anguillidae) in Gediz Lagoon (Izmir Bay, the Aegean Sea): Special Emphasis to Sexual Dimorphism","authors":"S. Gurkan, E. Taskavak, B. Taylan","doi":"10.1134/s0032945224010120","DOIUrl":"https://doi.org/10.1134/s0032945224010120","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In this study, we aimed to state how we can contribute to an effective population management and protection by determining the morphometric characteristics of European yellow eels, <i>Anguilla anguilla</i> Linnaeus 1758, in the Aegean Sea population, Izmir Bay. It was found that the eye index and condition values of the female specimens are higher than those of the males. While it was determined that there was a significant difference between both sexes in 19 of 20 morphometric measurements of the head region, there was no statistical difference only in the height measurement at the nostril level of the head. In our study, the fact that specimens with ovaries were seen among the females longer than 34 cm (length group II) is remarkable in terms of early maturation in the region. The differences in head measurements between sexes indicate the existence of a dimorphic structure and these differences are in favor of female specimens.</p>","PeriodicalId":48537,"journal":{"name":"Journal of Ichthyology","volume":"45 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139066866","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/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":"635 1","pages":""},"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":"15 1","pages":""},"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.
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