The analysis of the variability of walleye pollock stocks assessment and fisheries showed that in most areas the degree of exploitation is at a low level (4,7–13,5%), with the exception of the Navarinsky region of the Bering Sea, the coast of eastern Kamchatka, the northern Kuril Islands and western Sakhalin (16,7–18,9%). Climate change has a significant impact on the of walleye pollock stocks assessment. Positive anomalies of the PDO climate index (Pacific Decadal Oscillation) create favorable conditions for northern populations, whereas for southern populations living on the southern border of the area, on the contrary, those periods when negative anomalies are noted are more comfortable. Subject to the implementation of the cooling scenario in the North Pacific Ocean, walleye pollock biomass centers may shift to the southern regions (the economic zone of the DPRK), which will lead to a significant reduction in catches in the economic zones of the Russian Federation and the United States, which are currently the main players in the walleye pollock market.

Far East capelin is characterized by long-term cycles of its biomass dynamics. During XX and early XXІ century fishery of Far East capelin near Sakhalin Island was more intensive in the years of high abundance. In 1930s annual catches of this fish was not more than 0,8– 0,9 thousand tons. In 1970s catches varied from 0,93 to 2,50 thousand tons. In 2016–2022 capelin catches attained to record level, 3,5–13,7 thousand tons. Grate catches connected by complex reasons such as large spawning biomass, intensive fishery and its season near Sakhalin coast and some others. It is already clear that the northwestern coast of Sakhalin is the most ideal for reproduction, growth, and survival of capelin in the waters around Sakhalin Island. Reproduction productivity of this fish species in the Sakhalin area of Okhotsk Sea is much lower as an annual catches.

The article is devoted to the characteristics of the species composition of the coastal ichthyocenosis of the Baltic Sea in subdistrict 26 within the Kaliningrad region. Catches data on in the coastal part of the sea at depths of less than 20 m for the period 2006–2023 were used. Fishing was carried out using a set of fixed nets with a mesh size from 10 to 80 mm, a cast net and drag nets with a mesh size from 10 and 5 mm, respectively. These fishing gears allow to catch all fish species and all size groups. Totally, 1256 catches in different seasons and in different areas were carried out. The coastal ichthyocenosis are presented 32 fish species from 21 families. The targets of fishing are 90,6% of all species; 25,0% of which are actually fished, the frequency of occurrence of these species is 59,3%. The other species are non-target of fishing. In general, more than 80% of species were presented sporadically in the ichthyocenosis and their frequency of occurrence does not exceed 10%. The results of the research can be used to optimize fisheries and assess the impact of various types of economic activities on coastal ichthyocenosis.

The history and geography of the distribution of pink salmon Oncorhynchus gorbuscha in water bodies of the Taimyr Peninsula (Krasnoyarsk territory) is presented. Temperature conditions for spawning are indicated. The possible influence of pink salmon as an alien species for the fauna of Siberian rivers is discussed.

Bream in the river systems of the Oka basin is widespread, including tributaries of the third order. This representative of cyprinid fish is numerous mainly in the most full-flowing rivers with a length of more than 500 km. The age composition of bream from net catches in the Oka over a long period of observations did not exceed 14 age groups, and fish older than 12+ were not recorded in the Klyazma and Moscow rivers. The growth of bream in the Oka, Klyazma, and Moscow rivers does not differ significantly on average, due to seasonal bream migrations and similar feeding conditions. The main factor influencing the decrease in the number of bream in the Oka and Klyazma is a long period of low spring floods, which prevents flooding of the high river floodplain and sharply reduces the efficiency of its spawning, especially in the upper reaches of the Oka and Klyazma rivers. An adaptive feature of the reproductive biology of bream in the upper reaches of these rivers is the extended spawning migration of mature fish upstream, where the ripal vegetation in riverbeds serves as a spawning substrate for it. Bream in the rivers of the Oka basin is currently a secondary object of amateur fishing and one of the main species in poaching catches.

To differentiate Sakhalin saffron cod, 3 types of parasites can be used: Pyramicocephalus phocarum pl., Nybelinia surmenicola pl. and Echinorhynchus gadi. From a practical point of view, as a biological label for the differentiation of the navaga hall. It is advisable to use indicators of infection with Nybelinia surmenicola l in the south-east of Sakhalin and the north-west of the island. To determine the location of the catch of the navaga (applicable only for the areas of the north-west, south-east of Sakhalin and zal. Patience) it is necessary to examine at least 100 specimens of fish.

The species composition and size of bycatch of various hydrobionts in a specialized bottom trawl fishery for the atka mackerel Pleurogrammus monopterygius off the coast of Kamchatka and the Kuril Islands in the spring of 2016–2020 are considered. The catches included 77 species of fishlike and fish, as well as 9 species of commercial invertebrates. At the same time, their number varies according to fishing areas and depths, and the proportion by mass may exceed that of the main object. Among bycatch species, in addition to those whose fishing is carried out at the present time, high catches are typical for gray rockfish Sebastes glaucus, rock greenling Hexagrammos lagocephalus, great sculpin Myoxocephalus polyacanthocephalus, armorhead sculpin Gymnocanthus galeatus, as well as yellow Irish lord Hemilepidotus jordani and banded Irish lord H. gilberti. In this regard, it is believed that their catch has high potential on the specialized fishery of the atka mackerel.

In this paper an overview of multi-year catch dynamics for 2001–2022 and main fishery objects exploitation rates is presented, for two banks located in the northwest part of Atlantic Ocean outside of the Exclusive Economic Zones and included in an international regulatory area. An analysis of Russian quotes realization rate in the mentioned area is performed, catch dynamics for Russian and international fishery is shown, both for exploited and less-exploited stocks.  

The work provides information on the patterns of species composition of catches from the Russian fishing vessels conducted fishing of jack mackerel (Trachurus murphyi Nichols 1920), chub mackerel (Scomber japonicus Houttuyn 1782) and redbait (Emmelichthys spp.) in the South-Eastern Pacific Ocean outside the economic zones of the coastal States. According to scientific observations, an analysis of the composition of species caught by the Russian fishing vessels is given. When fishing in the pelagic zone over ocean depths, jack mackerel was the main target species, chub mackerel formed the bycatch. At the same time, the proportion of chub mackerel in catches in the northern parts was higher than in the southern ones. When fishing on seamounts of the Nazca Ridge, catches were dominated by redbait with jack mackerel and alfonsino (Beryx splendens Lowe, 1834) as bycatch. According to the similarity of the species composition of catches, three areas – 1) all the Southern and Central subareas and part of the Northern subarea; 2) seamounts of Nazca ridge; 3) part of the Northern subarea near the border of the EEZ of Peru between 17–20°S, were singled out using the cluster analysis method.

Recently driven changes in habitat conditions in the Azov Sea make classic applications of swept area method inconsistent. Swept area stock assessment method modification for stock estimation of aquatic biological resources through nonparametric bootstrap is presented. New approach is tested against classic calculated results of swept area method for next fish species: Azov anchovy, tulka, turbot and Black-Azov sea shad according to data collected during 2022. Results comparison of classic and modified through bootstrap stock assessment methods leads no significant deviations in mean value estimation. Maximum difference between mean estimates of stock size was 3,75%. Confidential intervals width difference between reviewed methods, in general, was not significant. Most valuable difference in confidential intervals was detected in BCa approach against classic method with quantile approach (due to methodological features of BCa in bias correction procedure). The new stock assessment approach for swept area method though bootstrap permit to calculate statistically valid estimates, their confidential intervals and perform input data validation. The absence of significant differences in the results by the classical and proposed methods indicates the further applicable possibility of classic method even in normality violation in source samples. The normality requirements in methodology of classic approach, probably, is redundant.

The paper presents the rationale for collecting information on the structure of catches and the distribution of bottom fish species (and in particular North-East Arctic cod) on fishing vessels in the Barents Sea and adjacent waters by observers of the Polar Branch of FSBSI «VNIRO» («PINRO» named after N.M. Knipovich). The problems that arise during the work of a scientific observer are described. Possible solutions to solve the problems of collecting materials on commercial catches are proposed. Increase of the scientific observers number on bottom fish fisheries and elevation of their legal status is recommended. A fundamentally new scheme for collecting information on the size distribution of fish in commercial catches by the crews of fishing vessels has been proposed.

The article examines state regulation of fishing activities and the mechanisms for its implementation, analyzes the main tools and methods used by the state to regulate fishing activities. The results of the study may be useful both for specialists in the field of fisheries science and for government agencies involved in the development and implementation of policies in this area.