AGE RECOGNITION IN CATCH-AT-SIZE COMPOSITION BASE ON MIXTURE SEPARATION OF PROBABILITY DISTRIBUTIONS
A. A. Mikheyev
SIZE SERIES, CATCH-AT-AGE STRUCTURE, GROWTH, MIXTURE OF PROBABILITY DISTRIBUTIONS, MODELING
A new method for recognizing age classes in a catch by its size composition is presented. The method is based on the model of mixture of probability distributions (MPD) and the SEM-similar algorithm of mixture separation and evolutionary stochastic decision optimizer. The MPD model is built based on the Bertalanffy’s stochastic law of growth. The size series of sea scallops of the genus Chlamys catches near Onekotan Island (northern Kuril Islands) and blue king crab catches from the eastern shelf of Sakhalin Island obtained for some years were used as an object of the method application. The generated data show that mixture separation exists and can be isolated from the numerous competitive decisions in the mean-square approximation. A class interval of the variation size series is ascertained to affect a success of separation of the mixtures considered. The obtained results prove the possibility of building a stable size-age key without the direct age determination.
DETERMINATION OF THE DENATURATION CHANGE PROTEIN FISH SAUSAGE PRODUCTS WITH HAM STRUCTURE
K. M. Oleynikova, O. V. Kyznetsova
DETERMINATION PROTEIN, FISH SAUSAGE PRODUCTS, HAM STRUCTURE
This work covers the problems connected with study of denaturation change protein fish sausage products with ham structure. Studied denaturation change protein depending on heat treatment and different additive.
METHODOLOGICAL RECOMMENDATIONS TO PLANNING AND CARRYING OUT THE BOTTOM TRAWL SURVEYS IN THE FAR EAST BASIN
А. B. Savin
BOTTOM TRAWL SURVEY, METHOD OF STUDYING
Brief instructions how to plan and to carry out bottom trawl surveys are given on the base of experience of expeditional studies in the Far East basin. We have analyzed the issues, as next: planning expeditional works and making scheme of trawl stations, making ichthyological studies and studies in the other scientific disciplines in the course of bottom trawl survey, brief description of bottom trawl gears, process of trawling, assessment of species composition of the catch and estimation of biological status of caught fishes, calculation of stock abundance and biomass, documentation and systematization of obtained data.
We provide references to the methods of marine ichthyological expeditional studies in the other basins and to the studies on the other scientific themes, provided in the course of trawl survey.
CHARACTERIZATION OF SMOLTIFYING CHUM SALMON (ONCORHYNCHUS KETA) MIGRANTS AND SOME OF HYSTOLOGICAL PARAMETERS OF THEIR GONADS IN THE KHAILULYA RIVER SYSTEM IN 2002–2003 (NORTH-EAST COAST OF KAMCHATKA)
L. О. Zavarina, S. B. Gorodovskaya
DOWNSTREAM MIGRATION, CONDITION FACTOR, SPAWNING, GAMETOGENESIS, OOCYTES DURING PREVITELLOGENESIS, SPERMATOGONIA
Data on juvenile chum salmon biological state, histological parameters of gonads and dynamics of down-stream migration have been demonstrated for 2002–2003. Stages of gonad maturation have been analyzed for juvenile chum salmon males and females, diameters of oocytes, oocyte nuclei and nuclei of spermatogonia have been measured.
COMPARATIVE CHARACTERIZATION OF EPIPELAGIC PHYTOPLANKTON IN THE PACIFIC OCEAN WATERS OFF KAMCHATKA
E. V. Lepskaya, V. V. Kolomeytsev, O. B. Tepnin, A. E. Shaginyan
PACIFIC OCEAN WATERS, KAMCHATSKY GULF, KAMCHATSKY AND AVACHINSKY HYDROLOGICAL SECTIONS, PHYTOPLANKTON, SPECIES COMPOSITION, ABUNDANCE, BIOMASS, CHLOROPHYLL
Studying some local areas of the north-west part of the Pacific Ocean was accomplished in 2006 and 2007 after «blossom» of plankton. Specifics condition of plankton microalgae at that time was expressed in diversity of species, some quantitative traits and structure of phytoplankton species in the subsurface waters of Avachinsky and Kamchatsky hydrological sections and in Kamchatsky Gulf. In its turn the sample size, which depended on the number of stations (samples), could influence final results also. Small number of microalgae taxons, revealed in Kamchatsky (19) and Avachinsky (37) sections, comparing to the number in Kamchatsky Gulf (79), can be due to this factor. Majority of diatoms and dynophyts in all samples was represented by nereitic cold-water species. The part of typical oceanic taxons did not exceed 19%. In 2006 and 2007 colonial diatom Chaetoceros, Thalassionema and Thalassiosira microalgae in the surface water were represented by short fragmental colonies or particular cells. With that, some of the cells were empty, what can indicate indirectly of poor physiological (photosynthetic) functioning of the diatoms. Probably this is why we did not succeed to find correlation between chlorophyll-a distribution and microalgae abundance and biomass at Kamchatsky section and Kamchatsky Gulf. Positive correlation between chlorophyll-a and biomass of autotrophic microalgae, found at Avachinsky section, was inauthentic on the reason of small sample size, and should be checked again. Distribution of microalgae within sections was generally influenced by surface currents. Aggregations of diatoms and Dinophyta within the sections were in the zones of microvortexes (vortex activities), whereas the main part of the algae in Kamchatsky Gulf was concentrated in the cold-water brackish coastal zones, and in general it was independent from behavior of surface currents.
WALLEY POLLOCK (THERAGRA CHALCOGRAMMA) MATURITY TIME IN THE NORTH PART OF THE SEA OF OKHOTSK FROM 1998 TO 2008
A. I. Varkentin
WALLEYE POLLOCK, MATURITY , THE SEA OF OKHOTSK, FISHERY, SURVEYS DATA
The time of walleye pollock maturity was examined on the data from TINRO-Сenter spring surveys and statistical data obtained by KamchatNIRO from commercial fishery trawl catches in the northern part of the Sea of Okhotsk from 1998 to 2008.
It is shown, that commercial fishery data perform different (higher) maturity rate by size groups, comparing to the rate assessed on the surveys data. It is found that maximally accurate insight about the maturity rate of walleye pollock in the northern part of the Sea of Okhotsk can be rather formed just on the results of the surveys, carried out within general area occupied by the population.
According to the data averaged for the period mentioned walleye pollock males and females can get mature being 3-years-old at the body length 27 cm and 30 cm respectively. The mass (50%) maturation of males (6-years-old) and females (7-years-old) has been performed at their length 36.0 cm and 39.2 cm respectively.
Archives / Volume 22
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