Journal / Archives
УДК 574.583 DOI: 10.15853/2072-8212.2017.46.42-50Download the full article
Long term dynamics and modern state of zooplankton community in the Lake Dalneye
Transformations in the zooplankton community were figured out and analyzed for the long period from 1938 to 2016. It was found, that juvenile sockeye salmon abundance, being dependent on the level of spawning run, predetermins species composition, year-to-year changes in the population indexes and size composition of forage organisms. Different vulnerability of crustacean populations in terms of increasing pressure of resident and anadromous juvenile sockeye salmon stocks was due to different vertical distribution, fecundity and sizereproductive characteristics of the forage organisms.
УДК 574.5(285:571.66):597.552.511 DOI: 10.15853/2072-8212.2017.47.46-64Download the full article
Condition of kokanee (Oncorhynchus nerka) population in Tolmachevskoye Reservoir in 2017
Results of monitoring of the condition of kokanee Oncorhynchus nerkapopulation in Tolmachevskoye reservoir in 2017 are demonstrated comparing the period 2011–2016. Analysis of the length-weight, age and gender structures, fecundity, health condition of feeding and spawning parts of the population in the river-reservoir continuum is provided. Assessment of stock abundance and spatial distribution of kokanee on the acoustic data is made.
УДК 597.553.2:59.087 DOI: 10.15853/2072-8212.2017.47.77-90Download the full article
Using the photo- and video records for assessment of Pacific salmon escapement on migration routes and spawning grounds: some of methodical approaches
As checking salmon escapement from the air (helicopter) is getting less extensive and detailed in Kamchatka, making photographies of spawning grounds has been resumed in two versions – from the shores and from the air (quadrocopter), and method of assessment of salmon escapement via statistical analysis of the photo-data was proposed based on obtained photographs of spawning grounds and migration routes. The essence is to figure out the number of the fish on calculated average values for each of loci and interpolating with the use of GPS-tracks. To legalize the method there was a comparison provided in 2017 between expert and methodical estimations for sockeye salmon in the basin of Nachikinskoye Lake, where early and late races spawned. It is demonstrated that the error (underesimation) for the late race was from 4 to 77%. Sockeye salmon escapement was evaluated based on the data. Discussion of the details of the method and versions of application and processing the data is provided.
УДК 597.552.51:639.32(265)DOI: 10.15853/2072-8212.2018.48.19-30Download the full article
Current state of the health of pacific salmon (Oncorhynchus) in the aquaculture of Kamchatka
Results of complex virological, bacteriological, parasitological and histological examination of juvenile and mature Pacific salmon from hatcheries of Kamchatka in 2015–2017 are demonstrated. The most dangerous pathogens for salmon included the Infectious Hematopoietic Necrosis Virus (IHNV) and bacteria Aeromonas salmonicida subsp. salmonicida, the causative agent of furunculosis. An asymptomatic carriage of IHNV was revealed in mature sockeye salmon (O. nerka) from two hatcheries and chum salmon (O. keta) in one hatchery. An outbreak of the IHNwas recorded among juvenile sockeye salmon at one of hatcheries in 2017. For the research period A. salmonicidawas found at four hatcheries in sockeye salmon, coho salmon (O. kisutch) and chum salmon used for reproduction. Histopathological changes typical as chronic form of alimentary toxicosis were the most frequent in liver, kidneys and gastrointestinal tract of juvenile individuals. Serious structural changes of the organs and tissues as a result of water or alimentary toxicosis were revealed in coho salmon underyearlings in 2017.
УДК 597.552.511 + 639.2.081.16 DOI: 10.15853/2072-8212.2018.49.85-99Download the full article
Результаты использования различных орудий лова на промысле тихоокеанских лососей в Камчатском крае в 2017 г.
Приведены итоги промысла тихоокеанских лососей в Камчатском крае в 2017 г. Проанализированы данные по вылову лососей на рыбопромысловых участках для промышленного и прибрежного рыболовства в зависимости от типа используемых орудий лова. Отмечены основные особенности и тенденции, характерные для промысла лососей различными орудиями лова. Даны предложения по дальнейшему развитию и организации промысла лососей на Камчатке.
УДК 574.52:592 DOI: 10.15853/2072-8212.2019.52.108-119Download the full article
Freshwater microalgae and invertebrates in the basin of Talovskoye Lake (Koryak Reserve, Kamchatka)
The list of the algaes and invertebrates of the system of Talovskoye Lake (the Koryak Reserve, Kamchatka) is provided for the first time. Author’s microphotographies are provided to illustrate algae taxons.