AQUATIC BIOLOGICAL RESOURCES OF THE NORTHWEST PART OF THE SEA OF OKHOTSK
Viktor V. Ovchinnikov, Oleg V. Prikoki, Sergey V. Klinushkin, Marina V. Rakitina, Vladimir V. Volobuev
Director; Head of the lab.; Researcher; Researcher; Adviser, Ph. D. (Biology); Magadan Research Institute of Fisheries and Oceanography
AQUATIC BIOLOGICAL RESOURCES, THE SEA OF OKHOTSK
Data on the major aquatic biological resources used by Far East fisheries within the North Okhotomorsk and West Kamchatka commercial subzones adjacent Magadan Region are presented. Stock abundance condition of the resources, their structural role for the fishery and the catches for the last five years are demonstrated. It is concluded that condition of the major commercial fish and shellfish species is satisfactory for a large scale fishery to operate on the shelf and local fisheries in the coastal zone of the Sea of Okhotsk.
TO THE ISSUE OF OPTIMAL SPAWNING ESCAPEMENT IN KURILSKOYE LAKE IN VIEW OF INTERNAL DIRECTED ECOSYSTEM PROCESSES IN RECENT DECADE
Ekaterina V. Lepskaya, тatyana V. Bonk, Vladimir а. Dubynin
Head of lab., Ph. D.; Senior Scientist; Leading Scientist; Kamchatka Research Institute of Fisheries and Oceanography
KURILSKOYE LAKE, SOCKEYE SALMON, OPTIMAL SPAWNING ESCAPEMENT, CLIMATE, ZOOPLANKTON, FORAGE BASE CONDITION
A complex analysis of the meteo- and hydrological data in the basin of Kurilskoye Lake (spawning and nursery system for the largest in Asia stock of sockeye salmon Oncorhinchus nerka) and of the monitoring data on hydrology, hydrochemistry, hydrobiology and ichthyology for the period from 1980 to 2016 was made. Warming in the basin of the lake has been revealed, resulting in increasing precipitation, temperatures and water content of the rivers within the basin and changes of hydrological and chemical regime of the Lake. The effects, in its turn, evoked structural and quantitative changes in phyto-, micro- and zooplankton, fish community and deterioration of juvenile feeding conditions for sockeye salmon and decreasing body weight of smolts of all ages. Methods to enhance the juvenile sockeye salmon’s forage base at the expense of regulation of spawning escapement and the reasons of the approach in terms of global warming are discussed.
WILD AND HATCHERY JUVENILE COHO SALMON OF THE BOLSHOY VILYUI LAKE
Tatyana L. Vvedenskaya, Nadezhda A. Rastyagaeva, Viktor F. Bugaev, Sergey V. Lipnyagov, Anna А. Shatrova, Irina S. Kholstova, Kirill I. Rusin
Leading Scientist, Ph. D. (Biology); Researcher; Leading Scientist, D. Sc. (Biology); Researcher; Kamchatka Research Institute of Fisheries and Oceanography
Bachelor; Kamchatka State Technical University
Principal fish culturist; Vilyuisky salmon hatchery
JUVENILE COHO SALMON, HATCHERY REPRODUCTION, WILD ORIGIN, MARKING, OTOLITHS, MIGRATIONS, LAKE, FEEDING, FOOD SIMILARITY
Fish biological survey carried out in October 20−22, 2015, has it demonstrated that autumn number of hatchery coho salmon 1+ age in the lake is same as the number of wild coho salmon underyearlings, 1+ age (mainly) and 2+ age individuals. Catches on the 14th of June in 2016 demonstrated that in spring, before releasing new hatchery coho salmon generation of 2+ age on June 17, only a small number of wild juvenile coho salmon of different ages could be observed in the lake. The main bulk of the juvenile stock, origin doesn’t play role, migrates to the sea in the age 2+. Licensed fishing of herring, pond and rainbow smelts in the lake in autumn and winter always reveals a number of big wild and hatchery juvenile coho salmon in bycatch. The losses cannot be prevented, because the time of the licensed fishing cannot be changed due to limited time when herring and smelts enter the lake. The total stop of the licensed fishing in the basin of Bolshoy Viluy Lake, to prevent harming the valuable salmon resource, can be the only solution of the problem.
KOKANEE ONCORHYNCHUS NERKA WALB. PARASITES AND FEEDING IN TOLMACHEVSKOYE RESERVOIR, KAMCHATKA
Оlesya yu. Busarova, Еvgeniy V. Esin
Associate prof., Ph. D. (Biology), Far Eastern State Technical Fisheries University
Leading Scientist, Ph. D. (Biology), Russian Federal Research Institute of Fisheries and Oceanography
SALMONIDS, LANDLOCKED POPULATION, INTRODUCTION, DEPLETION OF PARASITE FAUNA, FISH FEEDING
Only two parasite species were found in isolated kokanee population in Tolmachevskoye Reservoir: trematoda Diplostomum gasterosteiWilliams, 1966 and mixosporea Myxobolus arcticusPugatschov et Khokhlov, 1979. Groups of kokanee with different numbers of gill rakers did not demonstrate differences in the type of feeding or extent of infestation of the parasites.
SEXUAL DIMORPHISM AND SEXUAL-SIZE STRUCTURE OF STONE COCKSCOMB ALECTRIAS ALECTROLOPHUS (STICHAEIDAE) OF THE AVACHINSKAYA BAY(EASTERN KAMCHATKA
Marya yu. Murasheva, Alexey M. Tokranov
Post-graduate, Kamchatka State University by V. Bering
Dr. Sc. (Biology), Director; Kamchatka Branch of Pacific Geographical Institute, Far-Eastern BRANCH OF RUSSIAN ACADEMY OF SCIENCES
AVACHINSKAYABAY, EASTERNKAMCHATKA, INTERTIDAL ZONE, STONE COCKSCOMB, SEXUAL DIMORPHISM, SEXUAL-SIZE STRUCTURE
The sexual dimorphism in exterior (colour, size of fins and some other morphological features) and size traits of stone cockscomb Alectrias alectrolophusin the Avachinskaya Bay is considered. Male individuals of this species are found having brighter colouration, wider pectoral fins and intereye comb comparing female ones. Small individuals (<90 mm) demonstrate almost equal number of males and females or male predominance, but the percent of females increases among bigger individuals up to 100% andthe biggest ones.
IMPROVING OF DIRECT ACCOUNTING METHODS OF SEA HYDROBIONTS
Kirill M. Malykh, Sergey I. Subbotin, Artem V. Soshin, Andrey A. Adamov, Aleksey A. Nagornov, Mikhail N. Kovalenko
Senior Scientist; Reseacher Engineer; Senior Scientist; Senior Scientist; Researcher; Deputy Director, Dr. Sc. (Tehnology); Kamchatka Research Institute of Fisheries and Oceanography
MIDWATER TRAWL, BOTTOM TRAWL, POLLOCK, SURVEY, UNDERWATER ACOUSTICS, UNDERWATER VEHICLES
The article is devoted to the results of marine works, conducted laboratory of commercial fisheries in 2014–2016 years. Development and implementation of structures of midwater and bottom trawls for vessels pr. 1328 are allowed to expand the range of using fleet of institute FSUE “KamchatNIRO”.