Pub Date : 2024-01-29DOI: 10.1134/s1063074023080023
D. D. Golubinskaya, O. M. Korn, S. N. Sharina
Abstract
Rhizocephalan barnacle Parasacculina pilosella Van Kampen & Boschma, 1925, being a common parasite of the spider crab Pugettia aff. ferox Ohtsuchi & Kawamura, 2019, was founded for the first time on the crab Scyra bidentata (A. Milne-Edwards, 1873) (Brachyura: Epialtidae) in Peter the Great Bay (Russian waters of the Sea of Japan). Taxonomical identification of the parasite was made using morphological and molecular methods.
{"title":"Scyra bidentata (A. Milne-Edwards, 1873) (Brachyura: Epialtidae)—A New Host of the Rhizocephalan Parasacculina pilosella (Van Kampen & Boschma, 1925) (Rhizocephala: Polyascidae)","authors":"D. D. Golubinskaya, O. M. Korn, S. N. Sharina","doi":"10.1134/s1063074023080023","DOIUrl":"https://doi.org/10.1134/s1063074023080023","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Rhizocephalan barnacle <i>Parasacculina pilosella</i> Van Kampen & Boschma, 1925, being a common parasite of the spider crab <i>Pugettia</i> aff. <i>ferox</i> Ohtsuchi & Kawamura, 2019, was founded for the first time on the crab <i>Scyra bidentata</i> (A. Milne-Edwards, 1873) (Brachyura: Epialtidae) in Peter the Great Bay (Russian waters of the Sea of Japan). Taxonomical identification of the parasite was made using morphological and molecular methods.</p>","PeriodicalId":49584,"journal":{"name":"Russian Journal of Marine Biology","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139577834","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 : 2024-01-29DOI: 10.1134/s1063074023080084
A. V. Savelieva
Abstract
Appendicularians play an important role in marine food webs, but the alimentary canal of hermaphroditic oikopleurids, which prevalent among urochordates, is little studied ultrastructurally. Serial microtomy revealed that the alimentary canal of Oikopleura gracilis consists of a wide pharynx and a U-shaped gut with typical for oikopleurids anatomy: oesophagus, a bilobed stomach, the vertical, short mid- and voluminous distal or rectal intestines, ending the anal papilla. The mid-intestine leaves under the right gastric lobe. TEM analysis diagnosed the following features in the alimentary canal of Oikopleura gracilis. First, the pharynx is lined with a single layer of highly flattened non-ciliated epithelium. Above the anterior part of the endostyle the pharyngeal epithelium forms a thickening – ciliated ring. It is formed by cells of two types: prismatic, ciliated microvillar cells arranged in several parallel rows, and two rows of narrow parietal cells covering the first cell type. Ciliated ring serves as a kind of first valve, prevents food reflux. Second, in the pharynx of one of the specimens three flagellate protozoans with ultrastructurally similarities of free-living kinetoplastids were found. Third, an additional row of gastric band cells was revealed in the upper part of the right gastric lobe compared to that of the gastric floor. Giant electron-lucent vesicles with homogenous content associated with rough endoplasmic reticulum found in the cytoplasm of the gastric band cell, indicating probable storage the protein digestive secrets in these cells. Large multivesicular bodies diagnosed in gastric band cells ultrastructurally corresponded to autophagosomes. Forth, a new cellular type was found, the osmiophilic enterocytes, scattered throughout the digestive epithelium, that shared ultrastructural signs with apoptotic cells. Fifth, TEM data revealed the peritrophic membrane structure and proposed its formation. The absence of its own microflora in the peritrophic membrane, i.e., the absence of an immunity barrier, may be connected with the short ontogeny of appendicularians. The ultrastructural features revealed in the alimentary canal of O. gracilis expand our knowledge of the functioning of the appendicularians and serve as the basis for further research.
摘要附肢动物在海洋食物网中发挥着重要作用,但对泌尿纲动物中普遍存在的雌雄同体的食道却很少进行超微结构研究。连续显微解剖发现,Oikopleura gracilis 的消化管由宽阔的咽部和 U 形肠道组成,具有典型的泌尿纲动物解剖结构:食道、双叶胃、垂直的短中肠和体积较大的远端肠或直肠,最后是肛乳头。中肠从右胃叶下方离开。通过 TEM 分析,可以诊断出 Oikopleura gracilis 消化管的以下特征。首先,咽部有一层高度扁平的非纤毛上皮。在内柱前部上方,咽上皮形成一个增厚的纤毛环。纤毛环由两种细胞组成:棱柱状的纤毛微绒毛细胞平行排列成数排,以及覆盖第一种细胞的两排狭窄顶细胞。纤毛环起着第一道瓣膜的作用,防止食物反流。其次,在其中一个标本的咽部发现了三个鞭毛原生动物,其超微结构与自由生活的奇梭子虫相似。第三,与胃底相比,右胃叶上部发现了一排额外的胃带细胞。在胃带细胞的细胞质中发现了与粗面内质网相关的巨型电子透明囊泡,内容物均匀,表明这些细胞中可能贮存着消化蛋白质的秘密。在胃带细胞中发现的大型多囊体在超微结构上与自噬体相对应。第四,发现了一种新的细胞类型--嗜渗肠细胞,散布在整个消化上皮细胞中,与凋亡细胞具有相同的超微结构特征。第五,TEM 数据揭示了营养周膜结构,并提出了其形成原因。营养周膜中没有自己的微生物区系,即没有免疫屏障,这可能与阑尾的本体发育期较短有关。O. gracilis消化管的超微结构特征拓展了我们对附肢动物功能的认识,为进一步的研究奠定了基础。
{"title":"Ultrastructural Features of the Alimentary Canal in Hermaphroditic Appendicularians Oikopleura gracilis (Tunicata, Oikopleuridae)","authors":"A. V. Savelieva","doi":"10.1134/s1063074023080084","DOIUrl":"https://doi.org/10.1134/s1063074023080084","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Appendicularians play an important role in marine food webs, but the alimentary canal of hermaphroditic oikopleurids, which prevalent among urochordates, is little studied ultrastructurally. Serial microtomy revealed that the alimentary canal of <i>Oikopleura gracilis</i> consists of a wide pharynx and a U-shaped gut with typical for oikopleurids anatomy: oesophagus, a bilobed stomach, the vertical, short mid- and voluminous distal or rectal intestines, ending the anal papilla. The mid-intestine leaves under the right gastric lobe. TEM analysis diagnosed the following features in the alimentary canal of <i>Oikopleura gracilis</i>. First, the pharynx is lined with a single layer of highly flattened non-ciliated epithelium. Above the anterior part of the endostyle the pharyngeal epithelium forms a thickening – ciliated ring. It is formed by cells of two types: prismatic, ciliated microvillar cells arranged in several parallel rows, and two rows of narrow parietal cells covering the first cell type. Ciliated ring serves as a kind of first valve, prevents food reflux. Second, in the pharynx of one of the specimens three flagellate protozoans with ultrastructurally similarities of free-living kinetoplastids were found. Third, an additional row of gastric band cells was revealed in the upper part of the right gastric lobe compared to that of the gastric floor. Giant electron-lucent vesicles with homogenous content associated with rough endoplasmic reticulum found in the cytoplasm of the gastric band cell, indicating probable storage the protein digestive secrets in these cells. Large multivesicular bodies diagnosed in gastric band cells ultrastructurally corresponded to autophagosomes. Forth, a new cellular type was found, the osmiophilic enterocytes, scattered throughout the digestive epithelium, that shared ultrastructural signs with apoptotic cells. Fifth, TEM data revealed the peritrophic membrane structure and proposed its formation. The absence of its own microflora in the peritrophic membrane, i.e., the absence of an immunity barrier, may be connected with the short ontogeny of appendicularians. The ultrastructural features revealed in the alimentary canal of <i>O. gracilis</i> expand our knowledge of the functioning of the appendicularians and serve as the basis for further research.</p>","PeriodicalId":49584,"journal":{"name":"Russian Journal of Marine Biology","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140881706","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 : 2024-01-26DOI: 10.1134/s1063074023070064
A. N. Elnikov, O. V. Zelennikov
Abstract
A total of 122 coho salmon specimens were examined. The fish were caught in the coastal zone and in the rivers of Iturup Island (southern Kuril Islands) during their spawning migration in August–October 2021. Almost all females and males close to maturity in that year had spent 1 year at sea and were at ages of 1.1+ (66.7%) and 2.1+ (30.0%). Fish that had spent 2 years at sea were found singly: one specimen at an age of 1.2+ and three specimens at an age of 2.2+ (2.5%). Taking into account the age at maturity and the body weight (an average of 2.63 kg for females and 2.44 kg for males), an assumption can be made that the examined fish bred in short streams. The high value of the gonadosomatic index (up to 20–22% for some females) did not indicate that all the fish caught in the coastal waters would have run to other spawning grounds. At least a portion of them should have spawned in the water courses of Iturup Island, as was evidenced by the captures of a few coho salmon immediately in the rivers. Along with the fish running to the spawning grounds, two actively feeding coho females at an age of 0.0+ (0.55 kg) and 1.0+ (1.11 kg) were also caught with stake nets.
{"title":"The Coho Salmon Oncorhynchus kisutch from Iturup Island","authors":"A. N. Elnikov, O. V. Zelennikov","doi":"10.1134/s1063074023070064","DOIUrl":"https://doi.org/10.1134/s1063074023070064","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A total of 122 coho salmon specimens were examined. The fish were caught in the coastal zone and in the rivers of Iturup Island (southern Kuril Islands) during their spawning migration in August–October 2021. Almost all females and males close to maturity in that year had spent 1 year at sea and were at ages of 1.1+ (66.7%) and 2.1+ (30.0%). Fish that had spent 2 years at sea were found singly: one specimen at an age of 1.2+ and three specimens at an age of 2.2+ (2.5%). Taking into account the age at maturity and the body weight (an average of 2.63 kg for females and 2.44 kg for males), an assumption can be made that the examined fish bred in short streams. The high value of the gonadosomatic index (up to 20–22% for some females) did not indicate that all the fish caught in the coastal waters would have run to other spawning grounds. At least a portion of them should have spawned in the water courses of Iturup Island, as was evidenced by the captures of a few coho salmon immediately in the rivers. Along with the fish running to the spawning grounds, two actively feeding coho females at an age of 0.0+ (0.55 kg) and 1.0+ (1.11 kg) were also caught with stake nets.</p>","PeriodicalId":49584,"journal":{"name":"Russian Journal of Marine Biology","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139590105","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 : 2024-01-26DOI: 10.1134/s1063074023070143
V. I. Ostrovsky
Abstract
The relationship of Amur pink salmon catches in 1980–2018 with those landed 2 years before the current year’s fishing season is assessed. This relationship can be well approximated by a linear regression equation; the deviations from it are explained almost completely by variations in precipitation and air temperatures in the autumn and winter of the spawning year. It has been shown that the overestimated forecast of pink salmon catch for 2018 is due to the lowest amount of precipitation for the 40-year period with the lowest air temperature in 2016. The causes for the strength variations between the pink salmon year-classes of even- and odd-numbered years are discussed.
{"title":"Causes of Variations in Year-Class Strength of Amur Pink Salmon, Oncorhynchus gorbuscha (Walbaum)","authors":"V. I. Ostrovsky","doi":"10.1134/s1063074023070143","DOIUrl":"https://doi.org/10.1134/s1063074023070143","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The relationship of Amur pink salmon catches in 1980–2018 with those landed 2 years before the current year’s fishing season is assessed. This relationship can be well approximated by a linear regression equation; the deviations from it are explained almost completely by variations in precipitation and air temperatures in the autumn and winter of the spawning year. It has been shown that the overestimated forecast of pink salmon catch for 2018 is due to the lowest amount of precipitation for the 40-year period with the lowest air temperature in 2016. The causes for the strength variations between the pink salmon year-classes of even- and odd-numbered years are discussed.</p>","PeriodicalId":49584,"journal":{"name":"Russian Journal of Marine Biology","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139578148","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 : 2024-01-26DOI: 10.1134/s1063074023070131
O. V. Novikova, M. V. Rakitina, A. V. Metlenkov, L. A. Chernoivanova, A. Yu. Nemchenko
Abstract
The current status of the stocks, the dynamics of commercial fisheries, and the distribution of the saffron cod Eleginus gracilis in the fishery areas of the Far East are analyzed. In the Far Eastern basin, saffron cod makes the greatest contribution to the total catch of aquatic biological resources in the Karaginsky subzone (8.1%) and off western Kamchatka (3.6%). The total saffron cod catch from the Far Eastern seas in 2003–2022 ranged within 16 700–50 600 tons, with an average of 33 900 t. According to the data of bottom trawl surveys conducted in 2016–2023, the largest saffron cod aggregations are traditionally observed in the shelf waters off western Kamchatka, in the southwestern and northwestern Bering Sea, where the catch per unit effort reaches 4500 kg per trawling hour. Off western Kamchatka, the biomass of this species was estimated at 197 400 t; in the Karaginsky subzone, 100 400 t; in the West Bering Sea zone, 32 800 t; in the East Sakhalin and Petropavlovsk-Commander subzones, the values were similar, 17 100 and 17 200 t, respectively; and in the North Okhotsk Sea area, 8700 t. Almost all the exploited stocks in recent years have been above their average long-term annual level or fluctuated within its range. In general, the status of the saffron cod stocks in the fishery subzones at the present time can be considered satisfactory.
{"title":"Commercial Resources of Saffron Cod, Eleginus gracilis, in Russian Waters of the Far Eastern Seas","authors":"O. V. Novikova, M. V. Rakitina, A. V. Metlenkov, L. A. Chernoivanova, A. Yu. Nemchenko","doi":"10.1134/s1063074023070131","DOIUrl":"https://doi.org/10.1134/s1063074023070131","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The current status of the stocks, the dynamics of commercial fisheries, and the distribution of the saffron cod <i>Eleginus gracilis</i> in the fishery areas of the Far East are analyzed. In the Far Eastern basin, saffron cod makes the greatest contribution to the total catch of aquatic biological resources in the Karaginsky subzone (8.1%) and off western Kamchatka (3.6%). The total saffron cod catch from the Far Eastern seas in 2003–2022 ranged within 16 700–50 600 tons, with an average of 33 900 t. According to the data of bottom trawl surveys conducted in 2016–2023, the largest saffron cod aggregations are traditionally observed in the shelf waters off western Kamchatka, in the southwestern and northwestern Bering Sea, where the catch per unit effort reaches 4500 kg per trawling hour. Off western Kamchatka, the biomass of this species was estimated at 197 400 t; in the Karaginsky subzone, 100 400 t; in the West Bering Sea zone, 32 800 t; in the East Sakhalin and Petropavlovsk-Commander subzones, the values were similar, 17 100 and 17 200 t, respectively; and in the North Okhotsk Sea area, 8700 t. Almost all the exploited stocks in recent years have been above their average long-term annual level or fluctuated within its range. In general, the status of the saffron cod stocks in the fishery subzones at the present time can be considered satisfactory.</p>","PeriodicalId":49584,"journal":{"name":"Russian Journal of Marine Biology","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139578442","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 : 2024-01-26DOI: 10.1134/s1063074023070027
O. Z. Badaev, I. S. Chernienko, S. L. Ovsyannikova
Abstract
The significant decline in the abundance of the Greenland halibut Reinhardtius hippoglossoides matsuurae in the Northwest Pacific was one of the impetuses to scrutinize the age determination methods for this species based on different age-recording structures. The present study was carried out in accordance with recommendations of the Northwest Atlantic Fisheries Organization (NAFO) and the International Council for the Exploration of the Sea (ICES). An analysis of age determination data for the Greenland halibut has shown underestimation of age estimated using scales or whole otoliths compared to the technique using otolith sections through the peri-sulcular tuberosity. A resource exploitation strategy based on incorrect age determination can either be the major cause of negative trends in the status of the Greenland halibut stock or have a combined effect with natural factors.
{"title":"A Comparative Analysis of Age Estimates for Greenland Halibut, Reinhardtius hippoglossoides matsuurae, from the Northwestern Pacific Ocean based on Different Methodological Approaches","authors":"O. Z. Badaev, I. S. Chernienko, S. L. Ovsyannikova","doi":"10.1134/s1063074023070027","DOIUrl":"https://doi.org/10.1134/s1063074023070027","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The significant decline in the abundance of the Greenland halibut <i>Reinhardtius hippoglossoides matsuurae</i> in the Northwest Pacific was one of the impetuses to scrutinize the age determination methods for this species based on different age-recording structures. The present study was carried out in accordance with recommendations of the Northwest Atlantic Fisheries Organization (NAFO) and the International Council for the Exploration of the Sea (ICES). An analysis of age determination data for the Greenland halibut has shown underestimation of age estimated using scales or whole otoliths compared to the technique using otolith sections through the peri-sulcular tuberosity. A resource exploitation strategy based on incorrect age determination can either be the major cause of negative trends in the status of the Greenland halibut stock or have a combined effect with natural factors.</p>","PeriodicalId":49584,"journal":{"name":"Russian Journal of Marine Biology","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139577814","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 : 2024-01-26DOI: 10.1134/s1063074023070167
O. V. Zelennikov
Abstract
The information currently available in the literature as regards gametogenesis in the pink salmon Oncorhynchus gorbuscha Walbaum is summarized. The periods of indifferent development and sex differentiation, the features of testis and ovary development, and the formation of fecundity are considered. The patterns of sex reversal, which is unique for salmonids, and also the evolutionarily acquired specific features of oogenesis for providing the short life cycle are analyzed.
{"title":"Gametogenesis in Pacific Salmon. 1. Pink Salmon Oncorhynchus gorbuscha","authors":"O. V. Zelennikov","doi":"10.1134/s1063074023070167","DOIUrl":"https://doi.org/10.1134/s1063074023070167","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The information currently available in the literature as regards gametogenesis in the pink salmon <i>Oncorhynchus gorbuscha</i> Walbaum is summarized. The periods of indifferent development and sex differentiation, the features of testis and ovary development, and the formation of fecundity are considered. The patterns of sex reversal, which is unique for salmonids, and also the evolutionarily acquired specific features of oogenesis for providing the short life cycle are analyzed.</p>","PeriodicalId":49584,"journal":{"name":"Russian Journal of Marine Biology","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140888208","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 : 2024-01-26DOI: 10.1134/s1063074023070106
S. L. Marchenko
Abstract
Data on juvenile pink salmon from the continental coast of the Sea of Okhotsk for the 1960th–2010th are summarized. Timing and dynamics of downstream migration, qualitative characteristics, and feeding habits are considered. Brief information on the early marine life period is provided. Mass downstream migration of pink salmon fry begins when river water warms up to 2.5–4.0°C. Pink salmon fry migrate from rivers to the coastal marine waters diurnally. During downstream migration, their body length and weight usually do not vary significantly, but the proportion of fish that have switched to external feeding increases. On a long-term scale, the relative abundance of externally feeding juveniles in rivers is higher in the years of weak spring floods.
{"title":"Pink Salmon Oncorhynchus gorbuscha (Salmoniformes, Salmonidae) from the Continental Coast of the Sea of Okhotsk. Communication 2: Juveniles","authors":"S. L. Marchenko","doi":"10.1134/s1063074023070106","DOIUrl":"https://doi.org/10.1134/s1063074023070106","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Data on juvenile pink salmon from the continental coast of the Sea of Okhotsk for the 1960th–2010th are summarized. Timing and dynamics of downstream migration, qualitative characteristics, and feeding habits are considered. Brief information on the early marine life period is provided. Mass downstream migration of pink salmon fry begins when river water warms up to 2.5–4.0°C. Pink salmon fry migrate from rivers to the coastal marine waters diurnally. During downstream migration, their body length and weight usually do not vary significantly, but the proportion of fish that have switched to external feeding increases. On a long-term scale, the relative abundance of externally feeding juveniles in rivers is higher in the years of weak spring floods.</p>","PeriodicalId":49584,"journal":{"name":"Russian Journal of Marine Biology","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139589863","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 : 2024-01-26DOI: 10.1134/s1063074023070088
A. N. Makoedov, A. A. Makoedov
Abstract
Some parameters of abundance dynamics for the Pacific salmon species breeding in Russian waters are clarified and their possible catch on a medium-term scale estimated. The average annual catch for the 1907–2022 period was approximately 250 000 t. A complete cycle from the minimum values on the curves of one low-abundance period to the respective parameters of another period took approximately 72 years; from the relative maxima of one high-abundance period to another took 75 years. The duration of the high-abundance period was almost 35 years; the low-abundance period was almost 40 years. Taking various uncertainties into account, the periods of high and low abundance were approximately equivalent and remained within a relatively stable range from 35 to 40 years. Most of the high-catch seasons occurred in the odd-numbered years. Dominants usually changed during the periods of increase in Pacific salmon abundance. The average annual catches are expected to be higher than 250 000 t in the second half of the 2020s and the first half of the 2030s. Catch sizes are unlikely to be lower than 200 000 t even in the least productive years. In the final part of the high-abundance period, the raw material base of the Russian salmon fishery does not provide conditions for profitable operations at most of the fishing sites allotted for commercial harvesting.
{"title":"Russian Pacific Salmon: What Catches May We Expect?","authors":"A. N. Makoedov, A. A. Makoedov","doi":"10.1134/s1063074023070088","DOIUrl":"https://doi.org/10.1134/s1063074023070088","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Some parameters of abundance dynamics for the Pacific salmon species breeding in Russian waters are clarified and their possible catch on a medium-term scale estimated. The average annual catch for the 1907–2022 period was approximately 250 000 t. A complete cycle from the minimum values on the curves of one low-abundance period to the respective parameters of another period took approximately 72 years; from the relative maxima of one high-abundance period to another took 75 years. The duration of the high-abundance period was almost 35 years; the low-abundance period was almost 40 years. Taking various uncertainties into account, the periods of high and low abundance were approximately equivalent and remained within a relatively stable range from 35 to 40 years. Most of the high-catch seasons occurred in the odd-numbered years. Dominants usually changed during the periods of increase in Pacific salmon abundance. The average annual catches are expected to be higher than 250 000 t in the second half of the 2020s and the first half of the 2030s. Catch sizes are unlikely to be lower than 200 000 t even in the least productive years. In the final part of the high-abundance period, the raw material base of the Russian salmon fishery does not provide conditions for profitable operations at most of the fishing sites allotted for commercial harvesting.</p>","PeriodicalId":49584,"journal":{"name":"Russian Journal of Marine Biology","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887998","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 : 2024-01-26DOI: 10.1134/s1063074023070076
E. R. Ivshina, I. N. Mukhametov
Abstract
The spatial distribution of the Pacific herring Clupea pallasii in the Sea of Okhotsk waters at the northeastern coast of Sakhalin Island is described on the basis of data of the surveys using bottom and midwater trawls and a Danish seine conducted in June–October 1989 and 1997–2020. Herring are distributed widely, with the main aggregations forming in the area with depths of less than 100 m between Lunsky Bay and Piltun Bay, where herring of the North-East Sakhalin population feed. Herring in deeper waters presumably belong to the Okhotsk population.
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