The Status of the Stock and the Current Fishery for the Atka Mackerel, Pleurogrammus monopterygius (Pallas, 1810), in the Olyutorsky–Navarin Area, Bering Sea

2020 ◽  
Vol 46 (7) ◽  
pp. 535-549
Author(s):  
A. O. Zolotov ◽  
O. G. Zolotov ◽  
Yu. K. Kurbanov
Keyword(s):  
Bering Sea ◽  
The Status ◽  
Atka Mackerel ◽  
Pleurogrammus Monopterygius

scholarly journals STATE OF STOCKS AND MODERN FISHERY OF ATKA MACKEREL PLEUROGRAMMUS MONOPTERYGIUS (PALLAS, 1810) IN THE OLYUTORSKY-NAVARINSKY AREA OF THE BERING SEA

2020 ◽  
Vol 200 ◽  
pp. 38-57
Author(s):  
A. O. Zolotov ◽  
O. G. Zolotov ◽  
Yu. K. Kurbanov
Keyword(s):  
Bering Sea ◽  
Gulf Of Alaska ◽  
Aleutian Islands ◽  
Commander Islands ◽  
Spawning Grounds ◽  
Spawning Stock ◽  
Atka Mackerel ◽  
Pleurogrammus Monopterygius ◽  
Commercial Stock ◽  
The Bering Sea

Atka mackerel Pleurogrammus monopterygius is one of the mass species of fam. Hexagrammidae that inhabits the boreal and subarctic waters of the North Pacific and forms two large populations in its western and eastern parts. Reproductive range of the eastern, Aleutian population extends from the Gulf of Alaska, along Aleutian Islands to Commander Islands, with the main spawning grounds at the Aleutians and in the southeastern Bering Sea. From these areas, the fish at early stages of ontogenesis spread widely in system of the Bering Sea currents to the western-southwestern Bering Sea, where the atka mackerel aggregations are formed on the external shelf at prominent capes, as Cape Olyutorsky. Dynamics of the atka mackerel stock in the Olyutorsky-Navarinsky area in 1994–2019 is presented on the base of bottom trawl surveys, fishery statistics, and open NOAA data. After the period of low stock in the middle 1990s, the atka mackerel abundance increased sharply to the maximum in 2006–2008, when the spawning stock in this area was about 9.5 . 103 t and the commercial stock about 14.0 . 103 t. Since that time, trend to decreasing is observed, with the spawning stock 3.6 . 103 t and the commercial stock 5.6 . 103 t in 2013, and recent stabilization at the low level with slight decline continuing. A possible reason of the sharp increase in 2000s could be the intensive transport of the atka mackerel juveniles from the main spawning grounds at Aleutian Islands to the area at Cape Olyutorsky. The catches of atka mackerel in the Olyutorsky-Navarinsky area in 1994–2018 corresponded well with its stock dynamics.

Acoustic characteristics of forage fish species in the Gulf of Alaska and Bering Sea based on Kirchhoff-approximation models

2004 ◽  
Vol 61 (10) ◽  
pp. 1839-1850 ◽  
Author(s):  
Stéphane Gauthier ◽  
John K Horne
Keyword(s):  
Fish Species ◽  
Bering Sea ◽  
Gulf Of Alaska ◽  
Target Strength ◽  
Fish Length ◽  
Acoustic Characteristics ◽  
Capelin Mallotus Villosus ◽  
Variance Estimates ◽  
Atka Mackerel ◽  
Pleurogrammus Monopterygius

Acoustic surveys are routinely used to assess fish abundance. To ensure accurate population estimates, the characteristics of echoes from constituent species must be quantified. Kirchhoff-ray mode (KRM) backscatter models were used to quantify acoustic characteristics of Bering Sea and Gulf of Alaska pelagic fish species: capelin (Mallotus villosus), Pacific herring (Clupea pallasii), walleye pollock (Theragra chalcogramma), Atka mackerel (Pleurogrammus monopterygius), and eulachon (Thaleichthys pacificus). Atka mackerel and eulachon do not have swimbladders. Acoustic backscatter was estimated as a function of insonifying frequency, fish length, and body orientation relative to the incident wave front. Backscatter intensity and variance estimates were compared to examine the potential to discriminate among species. Based on relative intensity differences, species could be separated in two major groups: fish with gas-filled swimbladders and fish without swimbladders. The effects of length and tilt angle on echo intensity depended on frequency. Variability in target strength (TS) resulting from morphometric differences was high for species without swimbladders. Based on our model predictions, a series of TS to length equations were developed for each species at the common frequencies used by fisheries acousticians.

scholarly journals Feeding and food supply of juvenile fishes in the eastern Bering Sea in 2003-2012

2015 ◽  
Vol 181 (2) ◽  
pp. 129-140
Author(s):  
Natalia A. Kuznetsova
Keyword(s):  
Bering Sea ◽  
Cold Water ◽  
Walleye Pollock ◽  
Feeding Intensity ◽  
Sand Lance ◽  
Food Ration ◽  
Eastern Bering Sea ◽  
Fish Juveniles ◽  
Calanus Marshallae ◽  
Atka Mackerel

Feeding of fish juveniles in the eastern Bering Sea is investigated for the periods of 2003-2006 considered as relatively «warm» and 2007-2012 considered as relatively «cold». Small- and medium-sized zooplankton was the dominant prey in the 2003-2006, in particular copepods prevailed in the food of walleye pollock (41.5 %), pacific herring (48.3 %), and sand lance (71.7 %) juveniles, which in turn were the prey for pollock, herring and cod yearlings and other predators. On the contrary, large-sized zooplankton was more abundant in the 2007-2012, so arrowwarms ( Sagitta sp.), large-sized copepods (in particular Calanus marshallae ), euphausiids (mainly Thysanoessa raschii ), hyperiids, and pteropods were the prey for young fish: C. marshallae - for juveniles of pollock (40-45 % by weight) and capelin (32-34 %), Th. raschii - for yearlings of pollock (51 %) and herring (36-46 %), cold-water hyperiid T. libellula - for adult pollock (24 %), juvenile cod (9-18 %) and juvenile herring (9-11 %), whereas portion of fish in the diets was insignificant. In the warm period (2003-2006), juvenile pollock, herring, sand lance and capelin were zooplankton-eaters with the diets similarity 67 %, while yearlings of pollock and juveniles of cod, herring, sandfish, and atka mackerel were fish-eaters preying upon pollock juveniles. In the cold period (2007-2012), the diets of juvenile pollock, juvenile and adult capelin, and juvenile sand lance were also similar at 85-70 % but they preferred large-sized copepods and euphausiids ( C. marshallae and Th. raschii ), while yearlings of pollock, yearlings and adults of herring, and juveniles of sand fish and cod had the diets of 70 % similarity with Th. raschii prevalence. Feeding intensity was high for all species: the mean stomach fullness was 150-200 ‱ for pollock juveniles and yearlings, 200-250 ‱ for cod juveniles, 200-258 ‱ for sand lance juveniles, 302 ‱ for herring juveniles, and 178-250 ‱ for juvenile atka mackerel. The fullness had diurnal rhythm with three peaks: at noon - up to 179 ‱, in evening - up to 213 ‱, and at night - up to 204 ‱ (the data for walleye pollock juveniles in «cold» years only). Daily food ration of juvenile pollock is estimated as 6.7 % of its body weight in the «warm» years and 7.0 % in the «cold» years.

Life cycles and somatic production of hyperiids in the Okhotsk and Bering Seas

2014 ◽  
Vol 176 (1) ◽  
pp. 155-176
Author(s):  
Marina A. Shebanova ◽  
Valery I. Chuchukalo ◽  
Konstantin M. Gorbatenko
Keyword(s):  
Bering Sea ◽  
Fish Larvae ◽  
Life Cycles ◽  
Okhotsk Sea ◽  
Daily Production ◽  
Complex Surveys ◽  
Western Bering Sea ◽  
Maximal Life Span ◽  
Pleurogrammus Monopterygius ◽  
Far Eastern

Hyperiid species Themisto pacifica , T. libellula , and Primno macropa are widespread in the Far-Eastern Seas. They are an important element of trophic web in pelagic communities of these seas. Their food spectra are very broad and include copepods, euphausiids, arrowworms, and fish larvae. On the other hand, the hyperiids play an important role in the diet of large-sized marine organisms as walleye pollock Theragra chalcogramma , mackerels Scomber japonicus , Pleurogrammus monopterygius , and Pleurogrammus azonus , and japanese squid Todarodes pacificus . Life cycles and production of these hyperiid species are described on the base of samples collected in complex surveys conducted by Pacific Fish. Res. Center (TINRO) in the Okhotsk Sea and the western Bering Sea in 1984-2011. All three species have similar life history though the maximal life span is 2 years for T. pacifica and T. libellula but 3 years for Primno macropa . They spawn twice in their life in the period from May to October with the peak in July. Their weight increments also increase twice, usually when their size is 7-10 and 10-12 mm for T. pacifica and P. macropa and 10-15 and 20-30 mm for T. libellula . The average specific daily production of hyperiids in the Okhotsk Sea is estimated as 0.0410 for T. pacifica , 0.0273 for T. libellula , and 0.0101 for P. macropa ; but in the western Bering Sea - as 0.0492 for T. pacifica , 0.0361 for T. libellula , and 0.0094 for P. macropa . The most favorable feeding grounds for hyperiids are located at Kuril Islands, at West Kamchatka, and in the Anadyr Bay. Their summary annual production is estimated as 30.235 mln t in the Okhotsk Sea and 21.370 mln t in the western Bering Sea.

Cases of capture of Atka mackerel, Pleurogrammus monopterygius, transplanted to the Barents Sea from south-eastern Kamchatka

Fisheries ◽  
2021 ◽  
Vol 2021 (5) ◽  
pp. 61-64
Author(s):  
Nonna Zhuravleva
Keyword(s):  
Barents Sea ◽  
White Sea ◽  
Breeding Period ◽  
The White Sea ◽  
The Barents Sea ◽  
Experimental Works ◽  
Short Time ◽  
Atka Mackerel ◽  
Pleurogrammus Monopterygius ◽  
Made In

Atka mackerel, Pleurogrammus monopterygius was proposed for acclimatization to the Barents Sea long ago (Russ, 1958) and has been thoroughly studied in this regard. However, the number of experimental works by the transplantation of Atka mackerel from Kamchatka to the Barents Sea was small and their scale is insignificant. A total of 2 attempts were made in the 70s and 80s. The last time in 1982-1984, 6.5 millions of Atka mackerel caviar was transported from Kamchatka to Murmansk. Unfortunately, the systematic works by introduction was stopped. Meanwhile, the experience of acclimatization of Atka mackerel is very valuable not only for its practical orientation, which has in the future the additional production of fish in the Barents Sea, but also for a certain contribution to the development of the theory of acclimatization. The article provides information on the two repeated capture of Atka mackerel in the Barents Sea and six repeated in the White Sea. It is advisable to purposefully check the information on the White Sea; it is possible that the short time of the stay of adults Atka mackerel in the reservoir during the breeding period does not allow them to be identified during the annual ichthyological survey of the White Sea. It would be useful to catch of the Teribersky Cape of the Barents Sea, where adult Atka mackerel can be found during the breeding season. If the facts will not be confirmed, then our supposition remains true that the scale of work on the transplantation of Atka mackerel caviar was insignificant and the amount of imported caviar is small

New data on the occurrence of Atka mackerel Pleurogrammus monopterygius (Hexagrammidae) in the Sea of Japan

2009 ◽  
Vol 49 (1) ◽  
pp. 66-72 ◽  
Author(s):  
S. F. Solomatov ◽  
D. V. Antonenko ◽  
A. A. Balanov ◽  
P. V. Kalchugin
Keyword(s):  
Sea Of Japan ◽  
The Sea Of Japan ◽  
Atka Mackerel ◽  
Pleurogrammus Monopterygius
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