Information on dynamics of abundance for sockeye salmon of Russian origin is presented, with assumptions on prospects of this species fishery in the future decade. The average annual catch in the period from 1907 to 2022 was about 27 thousand tons. The abundance of Asian sockeye salmon decreased twice (before 1927 and in 1965–2001) and increased twice (in 1928–1964 and since 2002 to the present) for 35–37 years. So, the stock fluctuated with the period about 70–75 years. This dynamics of sockeye salmon abundance is very similar to changes in the stocks of other pacific salmon species of Russian origin; in particular, the annual catches of sockeye salmon correlate closely with the landing of pink salmon and chum salmon in 1971–2022. Taking into account these regularities, prospects of sockeye salmon fishery in the Russian waters are estimated. High values of the annual catch, no less than 35 . 10³ t, are expected until late 2020s — early 2030s.

The Amur pink salmon catches dependence on the yields landed 2 years before is investigated for 1980–2018. The relationship could be approximated well by a linear regression with deviations explained almost completely by variations of precipitation and air temperature in autumn-winter of the year of spawning. There is shown that the forecast of the pink salmon annual catch could not be realized in 2018 because of the extremely low air temperature and lack of precipitation in 2016 (the lowest values for the 40-year period). Reasons for the strength alternation between the even and odd year-classes of pink salmon are discussed.

The spawning stock of sockeye salmon in the Bolshaya River is evaluated for 1929–2022. Long-term tendencies are determined for their most important biological parameters, in particular, a juvenilization of returning spawners with decreasing of their body size, weight, and fecundity. Possible causes of these processes are considered. Biological indices of the sockeye salmon belonged to different races, ecological forms, ecotypes, and genders are compared statistically for different periods of time, with the frequency analysis. Changes in the size and age structure are revealed — range of the size and age variability has decreased. The age structure in the sea adjacent to the Bolshaya River mouth contradicts the hypothesis of a significant portion of sockeye salmon from Lake Kurilskoye in seine by-catch. The sockeye salmon abundance has changed periodically and recently is at the top of the wave. Compared to the 1929–2000 average, the stock has increased 6–7 times by 2020, and more than tenfold in 2022, whereas the average multiplicity of reproduction has increased 9 times (such a high value is obviously due to underestimation of spawning).

Pink salmon spawners in the channel connecting Lake Sopochnoe (Iturup Island) with the sea are investigated. The samples were collected in July-August, 2016. The males dominated significantly during entire spawning run. The fish became more and more ready for spawning with approaching to the end of the run. The average length and weight of females were 50.0 ± 0.3 cm and 1.53 ± 0.03 kg, the average length and weight of males — 50.2 ± 0.2 cm and 1.56 ± 0.02 kg; the fish caught in the channel were significantly larger than the pink salmon spawners caught in the adjacent Prostor Bay at the same time (on average 48.5 ± 0.1 cm, 1.32 ± 0.01 kg and 49.0 ± 0.2 cm, 1.40 ± 0.02 kg for females and males, respectively).

Annual data on biomass and number of pink salmon in catches, mainly landed from their feeding aggregations by trap nets, are presented for the Sakhalin coast of the Tatar Strait in 2003–2022. Number of the spawners entered to the rivers of this coast and number of the juveniles migrated downstream are assessed for some years. Dynamics of the pink salmon run to the rivers does not correlate with the dynamics of this species catch in the coastal waters that confirms the earlier conclusion about mixed origin of pink salmon in the feeding aggregations at the coast. The basis of pink salmon catches in recent years is the fish originated from the rivers of the adjacent mainland coast, whereas the stocks of pink salmon on the Sakhalin coast of the Tatar Strait are in depression caused by unfavorable environmental conditions of their spawning and embryonic development (as the spawning grounds erosion by extreme floods) and subsequent feeding of juveniles in the coastal waters (as heavy storms in the time of their migration from rivers).

Spatial distribution of pacific herring Clupea pallasii in the Okhotsk Sea waters at the northeastern coast of Sakhalin Island is described on the data of surveys conducted in June-October of 1989 and 1997-2020 using bottom and midwater trawls and Danish seine. The herring distribute widely, with the main aggregations in the area with depth up to 100 m between the Lunsky Bay and Piltun Bay. These aggregations are formed by the native herring of the North-East Sakhalin population, whereas the herring in the deeper waters belong to the Okhotsk population.

Significant decline in abundance of greenland halibut Reinhardtius hippoglossoides matsuurae in the North-West Pacific is one of the reasons for development the methods of this species age determination using different age-recording structures. The study is based on recommendations of the Northwest Atlantic Fisheries Organization (NAFO) and International Council for the Exploration of the Sea (ICES). Underestimation of age is found for the records on scales or whole otoliths, compared to records on the otolith slices through the tubercle. An exploitation strategy based on improper age determination can have a negative impact on the state of the greenland halibut stock, in combination with natural causes, or even be a major reason of this species depression.

The data on linear growth and the scale annuli forming are generalized for pacific herring in Peter the Great Bay. The growth zone on scales begins in April-May, whereas the annuli of slow growth are formed from October to January. The phenological season of active somatic growth also starts in April-May for herring in this area, the largest gains of the body length are detected in late summer — early autumn, and the active growth ends by NovemberDecember. Size diversity for young fish depends on starting conditions of growth in the first year of life and the timing of puberty. The diversity increases for adults because of the growth accelerating for the fish dwelling in local favorable environments with longer growing season. 

Filling of the rookeries of baikal seal Pusa sibirica on the northeastern coast of Lake Baikal is surveyed instrumentally for the first time within the boundaries of protected area. The main coastal haulouts of the species are located in this area, so all places suitable by their lithological parameters for the seals rookeries were examined to assess intensity of their use in modern conditions of anthropogenic impact. In total, ≈ 246 km of the coastline were traced, including 170 km surveyed with unmanned aerial vehicle DJI (in 317 minutes) and visual observations on the rest of the coast with binoculars and ground photo- and video-recording. Only 9 % of the surveyed coastline (> 21 km) is suitable for rookeries, located mainly in the northern part of the area. Unfavorable lithological properties (sands, sandy pebbles, small stones, rocks) prevail on the other part of the coast, though many places (usually big boulders) are available for small rookeries there, too. Currently all these places are almost never used by seals, except of short, sporadic haulouts, mainly in June, immediately after complete disappearance of the floating ice. The main reason why the animals leave their traditional rookeries in this area in July-August is an intensive anthropogenic load, in particular at the places where the largest rookeries existed previously, as the bays Frolikha, Ayaya, Khakusy, capes Khaman-Kit, Pongonye, and some others. The leaving of rookeries contradicts to increasing needs of seals for a solid substrate to complete their molt in conditions of climate warming. Possibly, the threat of losing the northeastern coast as a summer habitat for a significant part of the baikal seal population is underestimated.

The interannual dynamics of dissolved forms of carbon and nitrogen in the habitat zone of marine coastal plant communities has been studied in the waters of Peter the Great Bay, Sea of Japan/East Sea, with different levels of eutrophication, in summer. An analysis of the obtained data based on selection of functional models by the statistical methods has shown that the interannual dynamics in the contents of total dissolved nitrogen and carbon, as well as dissolved organic and inorganic carbon, have a nonlinear pattern. The hydrochemical regime of the water areas under study is discussed and their biological productivity assessed on the basis of the model trends. High productivity was recorded from coastal waters of Amur and Ussuri Bays characterized by different levels of eutrophication (high in Amur Bay and low in Ussuri Bay). This result indicates that coastal waters with both high and low eutrophication levels can be highly productive. The study of the interannual dynamics of variations in the dissolved organic and inorganic carbon content allows an assumption that the intensity of production and destruction processes is higher in coastal biocenoses of Ussuri Bay, while the activity of the biological carbon pump in the coastal waters of Amur Bay is decreased.

The strategy for development of agro-industrial and fishery complexes of the Russian Federation for the period up to 2030 focuses the domestic fish industry to increasing the volume of aquaculture products up to 618 thousand tons. With a proportional distribution of the regional load, the volume of seafood production in the Southern and the North Caucasian Federal Districts should be increased to 200 thousand tons by 2030. To achieve this level, the volume must increase by about 9 % annually that is almost 2.5 times higher than the actual gains. The problem can be solved with state support for development of large industrial farms that use warm wastewater from power plants or other industries. Further progressive development of aquaculture in the southern regions of Russia could be facilitated by creation of a state structure that provides practical interaction between enterprises, executive authorities, scientific and educational institutions.

The influence of temperature on development, growth and survival of pacific oyster Crassostrea gigas embryos and larvae is investigated in controlled conditions at a hatchery located in Peter the Great Bay (Japan Sea) — the TINRO subdivision for mariculture on Popov Island in July-August, 2019. The oyster embryos and larvae obtained from natural producers in the process of artificial spawning were grown under temperature of 21–22 ^оC (close to natural conditions in the coastal waters of Primorye) and 24–25 ^оC. The higher temperature had a positive effect on development and growth rate of embryos and larvae. Under the temperature of 24–25 ^оC, the embryogenesis was completed earlier by 2 hours, the transition to the D-veliger stage — by 8 hours, the stage of veliconch was reached in 1 day earlier, the stage of pediveliger — in 4 days earlier than under the temperature of 21–22 ^оC. The daily size increments were larger under the higher temperature, with the most significant differences at the stages of veliger (6.4 vs 4.2 µm day^–1) and veliconch (14.3 vs 10.9 µm day^–1), with no difference at the stage of pediveliger. The greatest average daily increment was reached with exotrophic nutrition (at the veliconch stage) in both cases. The larval mortality was higher under the higher temperature in 1.3 times at the stages from fertilized egg to D-veliger and in 1.4 times at the stages from D-veliger to pediveliger because of intensification of metabolic processes and the water pollution  in the tanks for growing, with the largest difference at the stages of veliger and veliconch, as well, as the longest ones. There is concluded that the temperature of 24–25 ^оC lays within the range of optimal conditions for embryonic and larval development of pacific oyster (within the biokinetic zone) and this temperature is recommended for cultivation of this species in Primorye hatcheries, with selection of optimal parameters for the rearing.

Statistical estimates for the exploitable stock of giant grenadier are determined, by fishing zones in the Russian Far East, and interannual dynamics of the species biomass is considered using historical data on catches and abundance. The assessments relationship with reference points of the biomass dynamic models is examined for the first time. With using the Bayesian approach, a priori assumptions about virgin biomass, which were made earlier on results of scientific surveys extrapolated to unsurveyed areas, are accounted in JABBA model; some errors in the catch and abundance indices are revealed. The parameters of instantaneous rate of recruitment and initial depletion of population are determined. Overfishing is not detected yet in any fishing zone, but a negative trend of the biomass dynamics is noticed for the Western Bering Sea fishing zone since 2015 (if the stock estimations based on surveys are realistic). The decline is reasoned by implementation of too high target for exploitation rate of vulnerable biomass (φ_F = 0.10) that is higher than such target for other fishing zones (< 0.08 or even 0.01 for the stocks exploited with the total allowable catch limits). That’s why annual catches exceeded the surplus production in the Western Bering Sea fishing zone in 2012 and since 2015 to nowadays. The sum of median estimations for the maximum sustainable yields in all fishing zones is about 47.4 ^. 10³ t that exceeds the values of total annual catch. The instantaneous rate of recruitment is almost equal in the neighboring fishing zones in the western Bering Sea and at East Kamchatka (0.086–0.085 by median, with 95 % credible intervals from 0.05 to 0.14) and is much higher at Kuril Islands with the maximum in the North-Kuril fishing zone. The latter case is possibly conditioned by partially external recruitment. Therefore, population structure of giant grenadier should be clarified for correct modeling of the recruitment; until then, the stocks assessments by fishing zones are available.