PoachersPoachers ((AgonidaeAgonidae)) ofof thethe RussianRussian partpart ofof thethe BeringBering Sea:Sea: spatialspatial distributiondistribution andand biologybiology AlexanderAlexander I.I. Glubokov,Glubokov, AlexeiAlexei M.M. OrlovOrlov Russian Federal Research Institute of Fisheries and Oceanography (VNIRO), 17, V. Krasnoselskaya st., Moscow, 107140, Russia List of cruises Number Year Months Ships' names Observers 1 1996 June-July F/V Rean-maru 35 P.A. Balykin, O.G. Zolotov 2 1996 July-August F/V Aq-maru 75 A.I. Glubokov, V.V. Maslennikov 3 1996 September-October F/V Rean-maru 35 A.I. Vapkentin, N.I. Naumenko 4 1996 December F/V Rean-maru 35 E.A. Michalutin, I.K. Trofimov 5 1997 June F/V Kaye-maru 28 S.I. Moiseev, A.M. Orlov 6 1997 June F/V Tenw-maru 78 А.S. Krovnin, V.N. Filatov 7 1997 June-July F/V Aq-maru 75 A.I. Glubokov, K.V. Ukolov 8 1998 November F/V Kaye-maru 28 V.A. Bizikov, Ch.M. Nigmatullin 9 1998 December F/V Tenw-maru 78 D.O. Alekseev 10 1999 June F/V Kaye-maru 28» V.A. Bizikov, A.I. Glubokov 11 1999 December F/V Kaye-maru 28 D.O. Alekseev, V.A. Bizikov 12 2000 June F/V Kaye-maru 28 D.O. Alekseev, A.I. Glubokov 13 2000 September-October F/V Kaye-maru 28 S.B. Popov, D.A. Terent'ev 14 2001 June-July F/V Kaye-maru 28 A.I. Glubokov, U.A. Fedorets 15 2001 August F/V Kaye-maru 28 D.O. Alekseev, R.N. Novikov 16 2001 October-December F/V Kaye-maru 28 S.B. Popov, D.A. Terent'ev 17 2002 August-September F/V Kaye-maru 28 А.О. Zolotov 18 2002 November F/V Kaye-maru 28 А.А.Bonk, S.B. Popov 19 2003 October-November BFFT Bagration G.V. Norvillo, А.V. Khodakov 20 2003 October-November BFFT Pioner A.I. Glubokov, S.B. Popov Nikolaevа a b c d e f Scheme of poachers’ (Agonidae) distribution density (kg/mile 2) based on the results of trawl survey in different seasons, mean multiannual (1996-2003): a – dragon poacher Percis japonica, summer; b – dragon poacher, autumn; c – dragon poacher, winter; d – sawback poacher Sarritor frenatus, summer; e – sawback poacher, autumn; f – longnose poacher S. leptorhynchus, summer а b 10 14 9 12 8 7 10 6 8 5 6 4 3 occurence, % occurence, 4 occurence, % 2 2 1 0 0 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 length, см length, см 3,1258 3,2865 c W= 0,0043L d W = 0,0012L 2 R2 = 0,9792 R = 0,9482 450 120 400 100 350 300 80 250 60 200 weight, g weight, 150 g weight, 40 100 20 50 0 0 15 20 25 30 35 40 15 20 25 30 35 length, см length, см Size frequency of dragon poacher Percis japonica (a) and sawback poacher Sarritor frenatus (b) and length-weight dependence of dragon poacher (c) and sawback poacher (d) from the Northwest Bering Sea a b 35 45 30 40 35 25 30 20 25 15 20 15 10 occurence, % occurence, % 10 5 5 0 0 I-II II II-III III III-IV IV I I-II II II-III III maturation stages maturation stages c d 35 25 30 20 25 20 15 15 10 occurence, % occurence, 10 occurence, % occurence, 5 5 0 0 I-II II II-III III IV VI-II I I-II II II-III III III-IV IV VI-II maturation stages maturation stages Distribution in catches of individuals of dragon poacher Percis japonica (5-12 July) and sawback poacher Sarritor frenatus (25 July – 18 August) by maturation stages in 2000: a – dragon poacher, females; b – dragon poacher males; c – sawback poacher, females; d – sawback poacher, males a b 100 100 females females 50 50 males males share of mature, % mature, of share % mature, of share 0 0 16 18 20 22 24 26 28 30 32 34 36 38 18 19 20 21 22 23 24 25 26 27 28 29 30 31 length, см length, см Ogyvas of dragon poacher Percis japonica (a) and sawback poacher Sarritor frenatus (b) in Northwest Bering Sea Productivity levels of dragon poacher Percis japonica and sawback poacher Sarritor frenatus from the Olyutor Bay of the Bering Sea Fecundity Length, сm Weight, g GSI, % Diameter of the oocyte, mm absolute, relative, eggs eggs/kg of weight Percis japonica (5-9 July 2000.) 35.0 265 9.63 2.9 - - 34.0 280 6.93 2.9 5970 21321 37.0 360 7.62 - 6752 18756 Average 2.9 6361 20039 Sarritor frenatus (15-16 August 2000) 28.8 82 11.67 1.3 3949 48159 28.9 75 5.31 1.5 1293 17237 26.6 83 17.03 1.8 3303 39795 Average 1.53 2848 35064 а b c d 5 7.9 8 6.9 6 4 7 5.9 3 6 LSI, % LSI, % LSI, % LSI, % 5 4.9 4 2 4 3.9 1 3 2.9 2 0 2 1.9 I-II II II- III III III-IV IV I I-II II II-III III 16 21 26 31 36 15 20 25 30 maturation stages maturation stages length, см length, см e а j f h 6 6 8.5 9 8 5.5 5.5 7.5 7 6 6.5 5 5 6 5.5 LSI, % 4.5 LSI, % 4.5 LSI, % LSI, % 5 4.5 LSI, % 4 4 4 4 3.5 3 3.5 3.5 2.5 2 3 3 1.5 1 I-II II II-III III IV V I-II I I- II II II-III III III-IV IV V I-II 19 24 29 17 22 27 2 maturation stages length, см length, см I-II II II-III III III-IVmaturation stages IV maturation stages Liver index (LSI) of females and males of dragon poacher Percis japonica (5-12 July) and sawback poacher Sarritor frenatus (25 July – 18 August) from the Northwest Bering Sea depending on the maturation stage and individual length in 2000: a, c – dragon poacher, females; b, d – dragon poacher, males; e, j – sawback poacher, females; f, h – sawback poacher, males а c e 0.112 0.14 0.22 0.11 0.2 0.13 0.108 0.18 HSI, % SSI, % 0.106 0.12 0.16 SSI, % 0.104 0.14 0.11 0.102 0.12 0.1 0.1 0.1 II II- III III III- IV IV II II- III III III- IV IV II- III III IV V I-II maturation stages maturation stages maturation stages b d f 0.225 0.16 0.2 0.14 0.18 HSI, % SSI, % 0.12 0.16 0.135 SSI, % 0.1 0.09 0.12 0.08 0.06 0.045 0.08 25 30 35 25 30 35 26.6 27.6 28.6 29.6 30.6 length, см length, см length, см Heart index (HIS) and spleen index (SSI) of dragon poacher Percis japonica, females and sawback poacher Sarritor frenatus, individuals of both sexes and females from the Northwest Bering Sea depending on the maturation stage and individual length in 2000: a-d – dragon poacher, females; e – sawback poacher, both sexes; f – sawback poacher, females Diet composition of dragon poacher Percis japonica from the Northwest Bering Sea (% by weight) Diet composition of sawback poacher Sarritor frenatus of different size groups from the Northwest Bering Sea (by frequency in full stomach), 25 July – 18 August 2000 Size groups, сm Food components < 20.0 20.1-23.0 23.1-26.0 26.1-29.0 > 29.0 Amphipoda 100.0 95.1 95.3 85.2 92.9 Euphausiidae - 1.2 3.1 4.9 - Isopoda - 7.3 3.1 6.6 - Zoarcidae - - - 1.6 - (juv.) Polychaeta - 3.7 10.9 9.8 - Pandalidae - 1.2 - 3.3 7.1 Fish eggs - - - 1.6 - Wastes of fish 4.8 1.2 - - - processing Number of 21 82 64 61 14 full stomach, ind. Number of 1 6 10 5 0 empty stomach, ind. Organs’ indexes of fish from the Bering Sea in summer-autumn periods Indexes Source of information Spices LSI HSI SSI GBSI Somniosus pacificus 9.19 0.181 0.406 0.553 Glubokov, 2004а 9.74 0.176 0.421 0.498 Bathyraja aleutica 8.94 0.212 0.511 - Glubokov, Orlov, 8.63 0.221 0.532 - 2000а Antimora microlepis 7.89 0.084 0.064 0.124 Glubokov, 2004б 7.66 0.11 0.045 0.181 Bothrocara brunneum 1.13 - - 0.463 Glubokov, Orlov, 1.01 - - 0.615 2000б Lycodes concolor 2.71 - 0.298 0.347 -“- 2.22 - 0.163 - Myoxocephalus 7.88 0.39 0.396 1.01 Glubokov, Orlov, 2004 polyacanthcephalus 7.72 0.409 0.404 0.99 Percis japonica 4.75 0.107 0.129 0.206 Own data 3.91 0.105 0.172 - Sarritor frenatus 4.29 0.139 0.166 0.141 -“- 4.49 - 0.138 - Note. Over line – females under line – males .