Some results of monitoring for the pink salmon hatchery stocks from the Aniva Bay (Sakhalin Island)

2015 ◽  
Vol 183 (4) ◽  
pp. 51-60
Author(s):  
Marina Yu. Stekol’Shchikova
Keyword(s):  
Pink Salmon ◽  
Wild Fish ◽  
Population Parameters ◽  
Sex Composition ◽  
Spawning Grounds ◽  
Fish Size ◽  
Natural Reproduction ◽  
Aniva Bay ◽  
Salmon Hatchery ◽  
Spawning Run

Several population parameters (length and dynamics of spawning run, size-sex composition, variability of morphological and physiological characteristics) are determined and indices of survival are calculated for the pink salmon hatchery stocks from the Aniva Bay of the 2008-2011 generations on the base of the cultured pink salmon differentiation by thermal marks on otoliths. The hatchery pink salmon begin their migration to the bay rivers in late July, together with the wild fish. Size-weight parameters of the fish and their variability are similar for the hatchery and wild stocks in this period, obviously because of low impact of hatcheries on natural reproduction and high portion of wild fish among the spawners used in the hatcheries (> 50 %). Mean portion of the hatchery-reared pink salmon on spawning grounds of the main rivers was 17.9 % in the 2010-2013, the coefficients of their return varied from 1.0 % to 6.4 % that was lower than for the wild fish.

scholarly journals ESTIMATION OF ABUNDANCE FOR THE MIGRATING JUVENILE PINK SALMON IN THE RIVERS OF SAKHALIN AND ITURUP ISLANDS IN 2019

2020 ◽  
Vol 200 ◽  
pp. 82-100
Author(s):  
A. M. Kaev ◽  
G. N. Dzen ◽  
P. S. Sukhonos ◽  
I. S. Bobrov
Keyword(s):  
Pink Salmon ◽  
Downstream Migration ◽  
Eastern Coast ◽  
Western Coast ◽  
Spawning Grounds ◽  
Iturup Island ◽  
Natural Spawning ◽  
Southeastern Sakhalin ◽  
Aniva Bay ◽  
Terpeniya Bay

Number of the pink salmon fry migrating downstream from their spawning grounds in the control rivers in 2019 is assessed as 17546.2 . 103 and 14795.7 . 103 ind. for the Dagi and Bolshoi Khuzi Rivers (northeastern Sakhalin), as 89.1 . 103 and 2636.1 . 103 ind. for the Poronai River tributaries — the Kholodny and Orlovka, as 2759.8 . 103 and 21456.0 . 103 ind. for the Lazovaya and Pugachevka Rivers (western coast of the Patience/Terpeniya Bay), as 5803.8 . 103 and 19020.0 . 103 ind. for the Voznesenka and Ochepuha Rivers (southeastern Sakhalin), as 1822.4 . 103 and 2139.0 . 103 for the Taranai and Kura Rivers (Aniva Bay coast), and as 15834.1 . 103 and 7626.1 . 103 ind. for the Rybatskaya and Olya Rivers (Iturup Island), respectively. In all areas, the pink juveniles migrated from the spawning grounds earlier than usual, obviously because of accelerated development of the embryos in conditions of abnormally warm autumn. The number of juveniles migrated from all spawning grounds in the rivers of respective regions is estimated taking into account the escapement of pink salmon spawners and the downstream migration index determined for the control rivers (ratio of the spawners escapement and the number of subsequent downstream migrating juveniles): the total number for the natural spawning grounds is estimated as 1168.9 . 106 ind. for the rivers of the eastern coast of Sakhalin (including the Aniva Bay) and 471.1 . 106 ind. for the rivers of Iturup Island (Okhotsk Sea coast). Additional 141.3 . 106 ind. were released from artificial hatcheries of eastern Sakhalin and 122.0 . 106 ind. — from artificial hatcheries of Iturup Island. The downstream migration is considered as highly abundant for northeastern Sakhalin and Iturup Island, but is insufficiently abundant for the Patience/Terpeniya Bay and Aniva Bay where the landings of this generation should be limited. The pink salmon return to southeastern Sakhalin in 2020 is expected to be better than in 2018 due to satisfactory abundance of the juveniles from natural spawning grounds.

scholarly journals Resources and fishery of Pacific salmon in Magadan region in the beginning of the 21st century

Trudy VNIRO ◽  
2020 ◽  
Vol 179 ◽  
pp. 90-102
Author(s):  
M. N. Gorokhov ◽  
V. V. Volobuev ◽  
I. S. Golovanov
Keyword(s):  
Chum Salmon ◽  
Coho Salmon ◽  
Pacific Salmon ◽  
Pink Salmon ◽  
Spawning Grounds ◽  
Magadan Region ◽  
Spawning Areas ◽  
Optimal Values ◽  
In The Beginning ◽  
Salmon Fishery

There are two main areas of pacific salmon fishing in the Magadan region: Shelikhova Gulf and Tauiskaya Bay. The main fishing species is pink salmon in the region. Its share of total salmon catch by odd-year returns reaches 85 %. Data on the dynamics of escapement to the spawning grounds of pink salmon of the Shelikhova Gulf and Tauiskaya Bay are presented. The displacement of the level of spawning returns of pink salmon into the Shelihova Gulf with the simultaneous reduction of its returns to the Tauiskaya Bay is shown. Data on the dynamics of the fishing indicators of pink salmon for the two main fishing areas are provided. The Tauiskaya Bay as the main pink salmon fishery area loses its importance is shown. Graphical data on the escapement of producers pink salmon to the spawning grounds are presented and the optimal values of spawning escapements are estimated. Chum salmon is the second largest and most fishing species. Information on the dynamics of the number of returns, catch and escapement to the spawning grounds of chum salmon is given. The indicators of escapement to the spawning areas and their compliance with the optimal passes of salmon producers are analyzed. The issues of the dynamics of returns number, catch and the escapement to the spawning grounds of coho salmon producers are considered. The level of the escapement to the spawning areas is shown and the ratio of actual to optimal values of passes is estimated. The role of coho salmon as an object of industrial fishing and amateur fishing is shown. The extent of fishing press on individual groups of salmon populations is discussed. It is concluded that it is necessary to remove the main salmon fishery from the Tauiskaya Bay to the Shelikhova Gulf.

Stomach Contents of Salmon and Steelhead Trout in the Northeastern Pacific Ocean

1966 ◽  
Vol 23 (1) ◽  
pp. 85-100 ◽  
Author(s):  
R. J. LeBrasseur
Keyword(s):  
Pacific Ocean ◽  
Chum Salmon ◽  
Coho Salmon ◽  
Pink Salmon ◽  
Stomach Contents ◽  
Northwestern Pacific ◽  
Steelhead Trout ◽  
Fish Size ◽  
Northeastern Pacific

Stomachs of pink, chum, sockeye, and coho salmon and steelhead trout caught during the summer of 1958 in gillnets fished overnight in the northeastern Pacific Ocean contained mainly zooplankton (Limacina, amphipods, copepods, and euphausiids), squid, and fish. Except for sockeye, there were no differences in contents related to fish size or state of maturity. Differences were found between species in the kinds of stomach contents present. The predominant organisms were amphipods and fish in pink salmon, crustaceans in immature sockeye, euphausiids and squid in maturing sockeye, euphausiids, fish, and squid in coho, and fish and squid in steelhead stomachs. The stomach contents of chum salmon were notable in that most of their contents were too well digested to identify. Comparison with the findings of workers in the northwestern Pacific showed no significant differences in the kinds of stomach contents, however, a greater amount of material was present in the stomachs they examined. The contents of stomachs from fish taken in various ocean domains were compared. Greater differences were noted in the stomach contents of fish from different domains than from different species. It is suggested that feeding is associated more with availability rather than with preferences for specific organisms.

scholarly journals Pathways of the Amur pink salmon Oncorhynchus gorbuscha to the areas of reproduction

2016 ◽  
Vol 186 (3) ◽  
pp. 121-134
Author(s):  
Vladimir I. Ostrovsky
Keyword(s):  
Russian Far East ◽  
Pink Salmon ◽  
Far East ◽  
Oncorhynchus Gorbuscha ◽  
Good Survival ◽  
Okhotsk Sea ◽  
Spawning Grounds ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Species Migration ◽  
By Catch

Biannual sequence of high-numerous and low-numerous year-classes of pink salmon ( Oncorhynchus gorbuscha ) is disturbed rarely in the areas close to its spawning grounds where mostly local groupings are landed, as it is shown on the data of fishery statistics in many areas of Russian Far East for 1907-1986. The disturbances are related usually with by-catch of transitory fish, in particular for the Sakhalin-Kuril region. Dynamics of the pink salmon annual landings in the Amur correlates with its dynamics at northwestern Sakhalin, that allows to suppose the species migration from the Okhotsk Sea to its spawning grounds via northwestern Sakhalin. Besides, a part of the Amur pink is caught at the mainland coast of the Gulf of Sakhalin, but the landings in the Amur correlate well with this transitory area in even years only, when the run is stronger. The highest catches of pink salmon on the mainland coast of the Gulf of Sakhalin in 2015 could be ensured neither the Amur nor the Sakhalin groupings; a hypothesis on the Shantar groupings contribution is discussed. In general, high catches of pink salmon in Khabarovsk Region in 2015-2016 are possibly reasoned by its good survival and lowered fishery in the Sakhalin-Kuril region.

scholarly journals A review of Pacific salmon hatchery programmes on Hokkaido Island, Japan

2006 ◽  
Vol 63 (7) ◽  
pp. 1353-1363 ◽  
Author(s):  
Kentaro Morita ◽  
Toshihiko Saito ◽  
Yasuyuki Miyakoshi ◽  
Masa-aki Fukuwaka ◽  
Toru Nagasawa ◽  
...  
Keyword(s):  
Adaptive Learning ◽  
Pacific Salmon ◽  
Pink Salmon ◽  
Active Regions ◽  
Masu Salmon ◽  
Learning Approaches ◽  
Management Tools ◽  
Salmon Hatchery ◽  
Species Specific ◽  
Hokkaido Island

Abstract Hatchery programmes involving the mass release of cultured fish have been implemented worldwide to supplement wild populations and to increase harvests. Hokkaido Island is one of the most active regions for Pacific salmon hatchery programmes, with ca. 1.2 billion (109) juveniles released annually along a coastline of ca. 3000 km. During the last quarter of the 20th century, coastal catches of chum and pink salmon increased dramatically, whereas those of masu salmon did not. In addition to the development of hatchery technologies, several possible hypotheses may explain these catch trends, including climate change, closing of high-seas fisheries, rehabilitation of water quality, habitat loss caused by damming and channelling, and increased pressure from recreational fisheries. Even when these other factors have been accounted for, it is difficult to evaluate whether all hatchery programmes have actually increased net populations. To use these programmes more effectively, it is necessary to evaluate both their river- and species-specific benefits and compare hatchery programmes with other management tools, such as fishery controls and habitat rehabilitation. Future hatchery programmes should incorporate active, adaptive learning approaches to minimize the risks associated with artificial propagation and to promote sustainable salmon stocks.

Natural Reproduction of Pink Salmon Studied at Little Port Walter, Alaska

Ecology ◽  
1942 ◽  
Vol 23 (2) ◽  
pp. 234-235
Author(s):  
F. A. Davison ◽  
S. J. Hutchinson
Keyword(s):  
Pink Salmon ◽  
Natural Reproduction

scholarly journals Spatial distribution and interannual variability of catches for pink salmon of artificial origin in the waters of eastern coast of Sakhalin Island in modern times

2021 ◽  
Vol 201 (2) ◽  
pp. 484-504
Author(s):  
M. Yu. Stekolshchikova
Keyword(s):  
Large Scale ◽  
Pink Salmon ◽  
Sakhalin Island ◽  
Eastern Coast ◽  
Northern Limit ◽  
Natural Origin ◽  
Modern Times ◽  
Aniva Bay ◽  
Artificial Origin

Mixed herds of pink salmon including the fish of both artificial and natural origin are exploited by fishery in many areas of Sakhalin Island. To separate the fish of different origin, large-scale tagging of the juveniles otoliths is conducted at salmon hatcheries since 2008. The hatcheries contribution to pink salmon catches in certain areas of East Sakhalin (from the Langeri River to Cape Crillon) is assessed for 2011–2017 on the base of previously published and new data on occurrence of the fish with marked otoliths. The specimens were sampled from commercial catches of 5–13 fixed nets and from research catches in 5–9 rivers throughout entire spawning season. In total, 40,992 otoliths of pink salmon were collected. The otoliths were prepared for microstructure analysis using standard methods of processing. All marked otoliths had the tags of hatcheries located on the eastern coast of Sakhalin. The fish of artificial origin were caught in all examined sites between Cape Soymonov and Cape Crillon every year, but in some years their distribution was wider, up to the northern limit of the investigated area (Langeri River). The fish of artificial origin migrated to all rivers within this area. The total annual landing of the pink salmon marked at artificial hatcheries in the East Sakhalin waters was estimated as 300–10600 t, by years. The rest of the fish of artificial origin (0.4–2.3 . 106 ind.) entered to the rivers and mostly reached the spawning grounds. Long-term dynamics of landing was compared for the pink salmon of artificial and natural origin and their independence was concluded. Distribution of pink salmon originated from certain artificial hatcheries by sites of catch was rather constant that allowed to extrapolate the results for marked fish to all released pink salmon. The highest contribution of pink salmon of artificial origin was noted for catches in the Aniva Bay (23.9 %, on average), it was lower for catches at the southeastern coast of Sakhalin (13.2 %), and more lower for catches in the Patience Bay (7.6 %). Total number of pink adults of artificial origin caught on a particular stretch of coast did not depend directly on the number of pink juveniles released from a local hatchery, but was determined mainly by number of fish migrated there from other hatcheries. The landing of pink salmon originated from artificial hatcheries directly in the rivers where these hatcheries were located and at their mouths was < 10 % of the total catch of pink salmon of artificial origin. Schemes of quantitative distribution of pink salmon with marked otoliths in the waters of East Sakhalin are presented.

scholarly journals Saltwater spawning grounds of sea-run brown trout (Salmo trutta) in tidal waters of a major Norwegian river

2021 ◽  
Author(s):  
Sven-Erik Gabrielsen ◽  
Robert J. Lennox ◽  
Tore Wiers ◽  
Bjørn T. Barlaup
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Pink Salmon ◽  
River Mouth ◽  
Competitive Balance ◽  
Spawning Grounds ◽  
Sea Trout ◽  
Spawning Areas ◽  
Brown Trout Salmo Trutta ◽  
Spawning Behaviour

AbstractSea-run brown trout (Salmo trutta) have a highly phenotypically plastic life history that allows them to be effective colonizers and competitors in freshwater. This paper documents a previously unknown spawning behaviour in a brackish, tidally influenced estuary 14 km from the mouth of the Vosso River, a major Atlantic salmon- and sea-run brown trout–producing river in western Norway. Putative spawning gravel was observed, and sea-run brown trout deposited eggs that hatched in April. Survival of recruits was high (> 95%) in the tidal spawning gravel. These areas are strongly tidally influenced with a peak of 23.17 psu recorded at the lowest spawning ground. The observation of spawning so far from the river mouth may be unique in such a system with a long estuary but provides important insight into the biology of sea trout. Invasion of pink salmon, also known to spawn in estuaries, may negatively affect the competitive balance of sea trout with other salmonids in rivers where sea trout populations rely on recruitment from these relatively extreme spawning areas. Restoration of estuaries that have been modified by dredging or channelization may be important to ensure quality and heterogenous habitat for sea trout spawning given that haline spawning grounds could contribute to population resilience.

scholarly journals Recent experience of surveying the spawning grounds of pacific salmons in the water bodies of Chukotka

2020 ◽  
Vol 200 (2) ◽  
pp. 270-291
Author(s):  
E. A. Shevlyakov ◽  
S. V. Shubkin
Keyword(s):  
Sockeye Salmon ◽  
Pacific Salmon ◽  
Pink Salmon ◽  
River System ◽  
Aerial Survey ◽  
Water Bodies ◽  
Recent Experience ◽  
Spawning Grounds ◽  
The Pacific ◽  
First Time

Aerial survey of the pacific salmon spawning grounds was conducted in the water bodies of Chukotka belonged to the Bering Sea basin (the Anadyr, Velikaya, Tumanskaya Rivers and Meinypilgyno lake-river system) in 2019, for the first time since 1992. Total flight time was 35 hours, approximate length of the transects was 3,800 km. Number of the spawners was estimated as 660.7 . 103 ind. for chum salmon, 112.2 . 103 ind. for sockeye salmon, and 3678.0 . 103 ind. for pink salmon, features of their distribution are described.

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