POPULATION FECUNDITY OF MASS SPECIES OF FLATFISHES (PLEURONECTIDAE) IN THE EASTERN PART OF THE SEA OF OKHOTSK
Yurii P. Diakov
Leading Scientist, Dr. of Science (Biology); Kamchatka Research Institute of Fisheries and Oceanography
FLOUNDERS, EASTERN PART OF THE SEA OF OKHOTSK, POPULATION FECUNDITY, GENERATION STOCK ABUNDANCE
The value and the year-to-year dynamics of the absolute and relative population fecundity of five mass species of Pleuronectidae is characterized for the eastern part of the Sea of Okhotsk. Estimation of the effects of parental fecundity onto the progeny stock abundance is made for these species. Results of the research indicate, that the effects depend on the level of habitat isolation during spawning, stock abundance and reproduction rate.
THE FORAGE BASE AND THE JUVENILE FEEDING BY SOME FISH SPECIES IN THE LOWER PART OF KOL’ RIVER
Vladimir I. Karpenko*, Diana P. Pogorelova**
*Prof., Dr. of Science (Biology); Kamchatka State Technical University
**Scientist; Kamchatka Research Institute of Fisheries and Oceanography
JUVENILE SALMON, FOOD COMPOSITION, FISH BODY CONDITION, FORAGE BASE, BENTHOS, FOOD SIMILARITY, FOOD INTERACTIONS, SELECTIVE FEEDING
The forage base condition and the juvenile feeding of some fish species was studies in the lower part of Kol’ River. Feeding and food interactions were analyzed in vicinity of the biological station “Kol’ River”. Benthos consists of a wide spectrum of organisms, where only 15 are elements of juvenile fish ration, while the basis of juvenile feeding normally includes 5−6 taxons at different stages of development. Although the fish body condition is high, intense food interactions are possible between the mass species Dolly varden and coho salmon in the course of their feeding. Evaluation of interactions between all representatives of local fish fauna in the river is urgent for future research.
THE KING CRAB PARALITHODES CAMTSCHATICUS IN FACT CATCH ASSESSMENT ON WEST KAMCHATKA IN VIEW OF INNOVATIVE APPROACHES TO STOCK ABUNDANCE ASSESSMENT AND FIGURING OUT THE TAC
Pavel Yu. Ivanov
Нead of lab., PhD in Biology, Kamchatka research institute of Fisheries and Oceanography
IN FACT CATCH, IUU-FISHING, TAC, CATCH-SURVEY ANALYSIS, KING CRAB
The in fact catch of king crab Paralithodes camtschaticuson the shelf of West Kamchatka was estimated from the official data about king crab import from Russia to Japan, South Korea, the USA and China. Despite significant reduction of IUU-fishing in recent years, the estimations on the in fact data and on the official commercial fishery statistics are visibly different on West Kamchatka. In order to figure out the TAC of king crab the in fact catch was used as one of basic parameter of model for stock abundance estimation and forecasting. It is concluded on summarizing the in fact catch values from custom surveys statistics by the countries importers of king crab and from the values of possible by-catch on the Danish seine fishery on West Kamchatka that in real the in fact catch of king crab is higher than Russian official statistical catch reported. Ignoring the data of the in fact catch of king crab in the process of stock abundance assessment or in forecasting commercial stock abundance results in underestimation of the values, causing a groundlessly low TAC. Critical analysis is provided for the West Kamchatkan king crab stock abundance and TAC assessment methods currently used. It is demonstrated, that the assessment model does not work correct to fit requirements in the Order № 104 by Rosrybolovstvo from 06.02.2015 “About providing materials of the TAC…”, and the error of the forecast, caused by the incorrect work of the model, demonstrates fluctuations within unacceptably wide margin.
EFFECTS OF SPECIFICS OF STRONGYLOCENTROTUS DROEBACHIENSIS FEEDING IN DEVELOPMENT OF GONADAL INDEX OF SEA URCHINS FROM THE AVACHINSKAYA BAY (SOUTH-EASTERN KAMCHATKA) IN SUMMER OF 2000
Elena A. Arkhipova
Leading Scientist, PhD, Kamchatka Research Institute of Fisheries and Oceanography
AVACHINSKAYA BAY, SEA URCHINS, STRONGYLOCENTROTUS DROEBACHIENSIS, FEEDING, MACROPHYTES, GONADAL INDEX
Effects of specifics of S. droebachiensisfeeding in development of the sea urchin gonad in the Avachinskaya Bay (South-East Kamchatka) were examined. The research was carried out in 2000 at four sampling stations. It is demonstrated, that high values of the gonad index in the station near Mayachniy Cape as due to feeding on the local kelp Agarum clathrusand in the station Bezymyannaya Bay – on Laminaria longipes. Low values of the gonad index were obsered along the west coast of the Avachinskaya Bay (near the rock Babushkin Kamen and Kozak Cape), where the urchins were feeding on unconventional (fragments of crustaceans) or not readily available (red coralline algae) forage, because the food supply was poor.
ANALYSIS OF CATCHABILITY OF FIXED NETS BASED ON SALMON KINEMATIC OR ORIENTATION BEHAVIOR
Yury A. Kuznetsov, Denis V. Kazakov
Prof. of dep., Dr. of Science (Tehnology); Graduate student; VPO “Dalrybvtuz”
HYDROBIONICS, SALMON, BEHAVIOUR OF FISH, BIOTECHNOLOGY OF FISHING
The article discusses issues of formation of salmon behavior within the area of fixed nets: factor analysis of fishing stability in view of hydrodynamics of water transfer in the critical areas of seine fishing is provided, the currents are measured and the velocity profiles of the currents are made when changing the design parameters of the nets. Experimental work about using physical means of remote influence on the behavior of fish or seals is accomplished on the plots of problem fishing, comparative assessment of the catches from the experimental and control nets is made.