Northern Sakhalin is a region of the intensive oil and gas transportation by oil-pipe lines. In July 2, 1997, the oil spill has happened at the oil-pipe line "Okha-Komsomolsk-on-Amur". Oil pollution spread over the basin of Tengi River (Amur estuary). The Tengi River is a spawning area for endemic and important commercial fish. There is a reserve on the river. Genus Oncorhynchus (pink and chum salmon) prevail in ichthyofauna. A satellite data analysis (NOAA-12, NOAA-14) was a success to accurate the oil distribution over the Amur estuary. As a result of the accident, more than 120 t of oil have been spilled. 26.3 km ofthe river area, more than 60 km of the Amur estuary coast and about 850 km2 of its water area were polluted. In the basin of Tengi River about 58000 m2 of spawning area were lost. The main damage (89 %)was caused to the fry feeding near the coast. The loss of fish production has constituted about 1800 t. By species the damage was as follows: 53 % -pink salmon, 29 % -chum salmon, 1 1 % -masu salmon and 7 % -coho salmon.

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