A holothurian fauna of the Avacha gulf (north-west part of Pacific Ocean)
This article includes information about species composition of holothurians in the Avacha Gulf (Kamchatka). This material collected by SCUBA divers and using the "Okean"-grab, and also based on samples from fishery expeditions of KamchatNIRO to the Avacha Gulf in the period from 1985 to 2011. Except four species found in the gulf before we discovered nine more. Thirteen species of holothurians found in the Avacha Gulf refer to three orders and six families. We also describe species, provide information about general morphology, ossicles texture and ecology. Drawings of external appearance and ossicles, identification key and diagnosis ofdescribed species are given in the article.