Kirill K. Kivva

• PhD
• Director of Department at All-Russian Research Institute Fisheries and Oceanography

At present, Pacific salmon (Oncorhynchus spp.) stocks in the Russian Far East are at a high level that is reflected in their catches. The mean total catch over the last five years (2018–2023) constituted 478,000 metric tonnes. More than half of the total salmon catch in the Far East is provided by pink salmon (O. gorbuscha). As a rule, it is the pi...

The annual water temperature in the major water masses of the Barents Sea (BS) has significantly increased since the early 2000s. Advective heat transport from the neighboring water areas and heat exchange through the sea surface are the major factors, which shape the hydrological conditions in the BS. The paper estimates the contributions of heat...

Variability of the total heat balance (HB) of the Barents Sea during the cold period of the year has been studied. The cold period is that of cooling of the sea surface when the heat flux is permanently oriented towards the atmosphere. The contribution of two major components of the HB, i. e. sensible and latent heat fluxes, to the observed increas...

В статье рассмотрены особенности пространственно-временных связей между численностью пополнения 20 запасов атлантической трески, пикши и сайды в североатлантическом бассейне и климатическими показателями за период 1984-2013 гг. Проведенный анализ выявил значительное количество синхронных и асинхронных связей динамики численности пополнения между ра...

Our extensive research spanning four decades (1979–2023) investigated the spatial and vertical distributions, dynamics of catch rates (CPUEs), and basic biological features of the understudied deep-water species whiteblotched skate (Bathyraja maculata), which inhabits the North Pacific Ocean. The data used in our study were gathered from publicly a...

The aim of this work is characteristic of spatio-temporal variability of Pacific water distribution in the Sea of Okhotsk based on Lagrangian approach and spatial analysis. Materials and methods . The study is based on geostrophic current data product from satellite altimetry. The dataset has resolution of 0,25° × 0,25° × 1 day. This data is used f...

In August 2019, VNIRO Transarctic expedition aboard the R/V Professor Levanidov accomplished hydrological and hydrochemical studies in the western part of the Chukchi Sea. We observed transformed Atlantic water (AW) at depth of 117–137 m, which is not typical for this water mass. Salinity values within transformed AW were in range from 34.2 to 35.7...

The eastern Sea of Okhotsk is commercially important ecosystem with substantial documented changes in physical setup and fish stocks. The productivity of this area is at least partly related to the water of Pacific origin which is rich in nutrients. However, the variability of Pacific-origin water distribution within this area is still purely studi...

High-latitude ecosystems commonly experience large phytoplankton blooms in spring, which provide basal resources for a range of grazers including zooplankton, benthic consumers and fishes. Variation of the timing and intensity of the spring phytoplankton bloom influences the degree of spatial and temporal overlap with consuming organisms. In the Be...

The distribution of water masses in August 2019 in the Chukchi Sea, and their hydrochemical features are i-nvestigated using shipboard data from the transarctic expedition onboard the R/V Professor Levanidov. The work was carried out in the southern shallow part of the sea and in the northern part of the sea outside the 70-meter isobath. Six main w...

The results of long-term (1948–2021) studies on the spatial and vertical distribution, dynamics of abundance, and size composition of the Aleutian skate Bathyraja aleutica in the North Pacific Ocean are presented. Maximum densities of this species were characteristic of the eastern Bering Sea slope, off the central Aleutian Islands, consisting of t...

Purpose : to characterize oceanographic conditions and their variability at various time scales within the walleye pollock area, including all Far Eastern seas of Russia, the Chukchi Sea, and the South Kuril and East Kamchatka regions. Methods : analysis of literary sources and data of expedition studies conducted by the Far Eastern branches of «VN...

The trajectories of 114000 passive particles regularly distributed on a grid in the Sea of Okhotsk are calculated for each day of the interval from January 31, 1997 to March 10, 2021, based on satellite altimetry data on geostrophic current speeds. All particles coming to the Sea of Okhotsk from the Pacific Ocean are identified and the age of the P...

The Barents Sea is one of the key areas in the Arctic for monitoring of climate change. Although the Barents Sea is one of the Arctic seas, it is never completely covered with ice. One of the parameters characterizing the change in the ice regime is the date of ice retreat (DOR). The study is based on ice concentration data from the NOAA / NSIDC Cl...

is study characterizes the spatiotemporal variability of chlorophyll-a in the Bering Sea and adjacent Pacific Ocean based on 2003–2019 MODIS data. Average long-term seasonal variations of the chlorophyll-a concentration are described, and the typical times of phytoplankton bloom in various parts of the given area are found. Interannual variability...

North Pacific Marine Science Organization (PICES) Special Publication

The northern Bering Sea and Chukchi Sea represent the gateway from the Pacific to the Arctic. This contiguous marine system encompasses one of the largest continental shelves in the world and serves as the sole point of connection between the North Pacific and Arctic Ocean. This region has unique attributes and complex dynamics, driven by the conve...

The main part of the annual primary production in the Arctic and Subarctic zones of the World Ocean is formed during the spring phytoplankton bloom. The timing of the bloom depends on combination of physical factors. Oscillating control hypothesis, proposed in [Hunt et al., 2002] for the Eastern Bering Sea, describes annual peculiarities of ecosyst...

The hydrochemical structure of the Caspian Sea, which is formed and changed under the influence of the dynamics of water and the intensity of production and destruction processes, has been studied. The formation of the biogenic base and hydrochemical structure of the waters of the Caspian Sea is greatly influenced by the phytoplankton community. Th...

Based on the data for 1982-2015, the significant influence of variability of oceanographic conditions on spatial and vertical distribution of redfish concentrations in the North Atlantic pelagial has been revealed. Warming of the Irminger Sea continued until the mid-2000s, resulted in the southwestward shift of subsurface planktonic crustaceans, fo...

In the Northern Hemisphere, most commercial fishes reveal northward expansion as a consequence of contemporary climate change. Some target species such as pelagic redfish in the Irminger Sea, show the different character, migrating closer to the center of the Subpolar Cyclonic Gyre (SCG). The main purpose of this study is to associate the spatial a...

A new method of biomass assessment of schoolmaster squid Berryteuthis magister, based on a modern view on the role of the North Kuril Islands area in functional structure of its range was presented. Squid biomass in this area consists of two components – the biomass in aggregations and rarefied, «background» biomass. Correlation of the biomass of s...

Most studies of the Global ocean confirm the existence of a close relationship between climatic and biological processes. The change in environmental factors is reflected in the distribution and condition of hydrobiont stocks. Physical processes that affect the biomass assessment and the beaked redfish distribution, results in international trawl-a...

The changes in the concentrations of dissolved organic carbon and nitrogen (Corg and Norg) in the waters of the western part of the Bering Sea and Anadyr Bay over the last two decades are analyzed. It is shown that Corg and Norg concentrations varied within very wide ranges over all the years of observations. The maximum variability of Corg concent...

Within the framework of the joint program under the Russian Federal Research Institute of Fisheries and Oceanography (VNIRO) and the Caspian Scientific‐ Research Institute of Fisheries and Oceanography (KaspNIIRKh) on the Caspian Sea monitoring, aboard the R/V Issledovatel’ Kaspiya , an integrated hydrological, hydrochemical, and hydrobiological su...

The results of decennial monitoring of the Caspian Sea were summarized, which allowed revealing the “pumping” of nutrients from the euphotic layer to deepwater depressions of the Central and Southern Caspian Sea. In parallel, in the deepwater depressions, growth of hypoxia to values of 0.2–0.5 ml O2/l proceeds. In 2006, hydrogen sulfide was registe...