Silver in the Pacific Ocean and the Bering Sea

The Bering Sea, Okhotsk Sea, Japan/East Sea and adjacent waters of the Pacific Ocean (mainly within EEZ of Russia) are compared by abundance of pelagic and benthic macrofauna, its species richness, evenness, diversity, and mean weight of animals using the data of long-term large-scale pelagic and bottom trawl surveys conducted by Pacific Fish. Res. Center (TINRO) in 1977-2010.

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Feeding of smoothtongue Leuroglossus schmidti in the Bering, Okhotsk Seas and adjacent waters of the Pacific Ocean

Izvestiya TINRO ◽

10.26428/1606-9919-2016-184-150-157 ◽

2016 ◽

Vol 184 (1) ◽

pp. 150-157

Author(s):

Alexander Ya. Efimkin

Keyword(s):

Bering Sea ◽

Mesopelagic Fish ◽

The North ◽

Important Prey ◽

The Pacific ◽

Upper Epipelagic Layer ◽

The Pacific Ocean ◽

The North Pacific ◽

Epipelagic Layer ◽

The Bering Sea

Smoothtongue Leuroglossus schmidti is a small mesopelagic fish species common for subarctic waters. It rises to the upper epipelagic layer at night for feeding and preys mainly on euphausiids, copepods and amphipods. Its mean index of stomach fullness reaches 68 ‱ in the epipelagic layer, but it almost doesn’t feed deeper than 200 m, judging by a little food in the stomach. In the Bering Sea, euphausiids dominate in its diet and the portion of copepods is small. In the Okhotsk Sea, each of these two groups provides a half of the diet. In the North Pacific, the portion of copepods is 63 % on average, euphausiids are the second important prey, and amphipods occur in the diet occasionally. Daily ration of smoothtongue is about 1.4 %.

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Feeding of adult sea bream Brama japonica in the Pacific Ocean and the Bering Sea

Izvestiya TINRO ◽

10.26428/1606-9919-2014-176-210-215 ◽

2014 ◽

Vol 176 (1) ◽

pp. 210-215

Author(s):

Alexander Ya. Efimkin

Keyword(s):

Bering Sea ◽

Feeding Habits ◽

Sea Bream ◽

Daily Ration ◽

The North ◽

The Pacific ◽

The Pacific Ocean ◽

High Concentrations ◽

The North Pacific ◽

The Bering Sea

Feeding habits of adult sea bream are considered on the samples collected in the North Pacific and Bering Sea in the last several years. This species is a predator with the diet highly dependent on its habitat and composition of prey (small-sized fish and squids). It has two or three peaks of consumption daily, which change seasonally and year-to-year; anyway, the morning (3-6 a.m.) is usually the time of the lowest consumption, at least in summer and autumn, and the daytime is the normal time for feeding. The sea bream does not eat zooplankton usually, but Euphausia pacifica was a significant portion of its diet (34 %) in the southern part of surveyed area in the summer of 2009, possibly because of high concentrations of euphausiids in that area. Daily ration of adult sea bream is 2.5-3.5 % of its body weight.

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Inventory of the eastern Bering Sea sponge fauna, geographic range extensions and description of Antho ridgwayi sp. nov.

Zootaxa ◽

10.11646/zootaxa.4567.2.2 ◽

2019 ◽

Vol 4567 (2) ◽

pp. 236

Author(s):

ROBERT P. STONE ◽

HELMUT LEHNERT ◽

GERALD R. HOFF

Keyword(s):

New Species ◽

Pacific Ocean ◽

Bering Sea ◽

New Records ◽

Stock Assessment ◽

Geographic Range ◽

Eastern Bering Sea ◽

The Pacific ◽

The Pacific Ocean ◽

Hexactinellid Sponges

A total of 493 sponges were collected with a bottom trawl during annual groundfish stock assessment surveys in the eastern Bering Sea in 2013, 2015, and 2016 to build an inventory of species in this largely unexplored region. We report here principally on the demosponge fauna collected during those surveys because identifications of hexactinellids are incomplete. We identified 42 unique demosponge taxa from the collection including geographical range extensions for 30 species; seven are new records for the Pacific Ocean. The collection also included three species new to science; two have been previously described (Plicatellopsis borealis Lehnert & Stone 2017, Spongosorites beringensis Lehnert & Stone 2017) and Antho ridgwayi sp. nov. described here. The new species differed from all northern hemisphere congeners in the complements and sizes of spicules. We document that the region is more species rich than previously suspected, particularly the continental slope where the majority of hexactinellid sponges are located.

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