Some Biological Characteristics of the Primorsky Scallop Cultivated in the Area of the Oil Terminal in Kozmino Bay (Nakhodka Bay, Sea of Japan)

Monitoring of the impact of the production activities of oil ports on the water area in general and on the hydrobionts living there, in particular, is a subject of the great attention. Some biological characteristics of the Primorsky scallop, grown by the hanging method at the experimental site in the conditions of the Kozmino bay were studied. Individuals of the same age of different generations were subjected to biological analysis. A comparative study of the size and weight characteristics showed that in the 2016 generation, the average shell height was higher, but the average total mass was higher in the 2015 generation of mollusks, which is due to the uneven growth of the shell of mollusks. Based on the research, it can be concluded that the size and weight characteristics correspond to the standard growth indicators for the scallop of the studied age groups, which indicates favorable living conditions for cultivated mollusks.

Dynamics and water structures in the estuary of the Partizanskaya river (Nakhodka Bay, Sea of Japan)

Herein, we report field studies of the seasonal and daily dynamics of the mixing zone in the micro-tidal mouth of the Partizanskaya river. The position of the mixing zone was determined according to the volume of river run-off. The upper boundary of the mixing zone was observed at 5 (at a river run-off of 73.67 m3/s) to 12.5 km (at 7.7 m3/s) from the mouth bar. The estuary is characterized by a two-layer circulation of water, which results in a halocline with a salinity gradient of up to 30% per 1 m. Variations of salinity in the rifts caused by tides reaches 27% over 3 h.

Oil-oxidation properties of Micrococcus bacteria isolated from the Nakhodka Bay seawater of the Sea of Japan

This paper shows the oil-oxidizing ability of Micrococcus bacteria isolated from the Nakhodka Bay surface waters of the Peter the Great Gulf, the Sea of Japan. Micrococcus Bacteria are known to be the most active destructors of petroleum hydrocarbons in natural biotopes, contaminated objects. Voroshilova-Dianova liquid containing 2,5% oil or oil products was introduced into sterile penicillin bottles with 105 cells of the investigated bacteria. The ability to destruct petroleum hydrocarbons by bacteria of this genus was studied using a gravimetric method during 30 days. Destruction of oil, gasoline, fuel oil and diesel fuel was shown. Micrococcus bacteria showed a high oil-oxidizing ability and decompose 65-99,9% of oil and oil products within 30 days. Gasoline was the source of petroleum hydrocarbons with the greatest ability to utilize this genus of bacteria. The destruction of this hydrocarbons source by bacteria on days 15-20 was about 99% of the initial concentration. The lowest ability of destruction by Micrococcus bacteria was revealed for diesel fuel.