Search

Results:

Vol. 18 (2015 year), No. 4

Shokina Yu. V., Kravets P. P., Lutsyk P. V.
Evaluation of techno-chemical properties of the bivalve mollusk Mya arenaria as fishery perspective object and aquaculture of the Kandalaksha Bay

The paper presents characteristics of the techno-chemical properties of the bivalve mollusk Mya arenaria (edible part, overall chemical composition, composition of nitrogen compounds) widespread in the Kandalaksha Bay. The analysis of these properties of the bivalve allows consider the clam as a perspective object of fishing and aquaculture

(in Russian, стр.5, fig. 2, tables. 2, ref 11, Adobe PDF, Adobe PDF 0 Kb)

Vol. 20 (2017 year), No. 2, DOI: 10.21443/1560-9278-2017-20-2

Smirnova A. S., Kravets P. P.
Structure of settlements of Macoma balthica in the southern knee of the Kola Bay

The study of seasonal dynamics of size-mass structure of Macoma balthica settlements has been investigated on the littoral zone of the southern part of the Kola Bay. Age structure has been calculated; data on the density and biomass of settlements have been obtained; the distribution of the mollusk on the littoral has been shown. On the littoral zone of the Kola Bay makoms are found everywhere, mostly inhabiting the lower and middle horizons of the littoral; this distribution depends on the content of food particles, which is an indirect indicator of the granulometric composition of soil and total organic content. The highest indicators of biomass and the number of settlements have been marked in the intertidal zone near the village of Abram-mys. This is due to the presence of silty-sandy soil – the most suitable habitat for shellfish, as the abundance of settlement figures increases as the silting of sand. The increase in the density of makom settlements in autumn occurs due to the active settling of juveniles. Shellfish from the right bank settlements surpass others on the morphometric parameters. Large shell sizes are explained by the presence of streams ensuring the inflow of food particles. Researches of the size-distribution of Macoma balthica mass parameters have shown that their values are increased from the upper to the lower horizon littoral as in the lower horizon the enhanced water exchange contributes to the self-cleaning processes and provides shellfish by food. The dominance of mollusks of younger age groups (0–3 years) is characteristic for all settlements. Clams with the maximum age of 8 years have been found in the New Bridge area. The presence in the samples of large number of mollusks of younger age groups indicates the normal development of Macoma balthica settlements.

(in English, стр.6, fig. 5, tables. 1, ref 10, Adobe PDF, Adobe PDF 0 Kb)

Vol. 21 (2018 year), No. 2, DOI: 10.21443/1560-9278-2018-21-2

Kalinina N. R., Anokhina V. S., Kravets P. P., Tyukina O. S.
Weight growth of different generation of the trout Parasalmo mykiss on Lake Imandra

The averaged indicators of the weight growth of four generations of trout at different temperatures in the time interval of the life cycle from the transfer of larvae to cultivation until the fish reaches a portioned commercial weight of 400 g when the first withdrawal of products for sale takes place have been analyzed. It has been shown that fish of different generations passes into the weight category "goods" sequentially, but after reaching different ages, while there is no direct correlation between the terms "generation formation" – "first withdrawal for sale". According to our data the most intensive weight growth of fish has been noted in the temperature range equal to 8–13 °C. An increase in the water temperature in the cages to 15–18 °C has led to a slowdown, and then to the suspension of the accumulation of fish biomass. In cages operating in the area of Kola NPP heated water trout of April generation gains the commercial weight of 400 g in 7–8 months after landing of larvae for cultivation, November trout – after 15 months. Trout of October and January generation reaches commercial weight at 11 and 9 months, respectively. The stretching of timing of biomass accumulation is most pronounced in the autumn generation of trout. It has been found that the greatest increase in weight per unit body (145.1 mg per day) is provided by the trout of the January biological group, the smallest – by the November trout (75.8 mg per day). The energy reserve of heat allowing for differently derived individuals to reach a commodity weight of 400 g, is in the range from 3 320 to 5 300 degree-day.

(in English, стр.8, fig. 6, tables. 4, ref 13, adobe PDF, adobe PDF 0 Kb)