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with hauls higher catch rates day. Individual establish the for each t with hauls higher catch rates day. Individual establish the for each t

with hauls higher catch rates day. Individual establish the for each t - PDF document

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with hauls higher catch rates day. Individual establish the for each t - PPT Presentation

199399 in 1995 and 70 in 1996 la et presentation dune serie refletant operations de pccherie donnees soulignent que dans cette region la pche de krill etait localisee dans un ID: 101036

1993 9.9 1995 and 7.0

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1993,9.9 in 1995, and 7.0 in 1996), with hauls higher catch rates day. Individual establish the for each times associated with shooting and hauling the short and showed little variation, whereas the time associated with the actual fishing period was longer was almost period and showed similar levels moved between consecutive hauls were generally small, suggesting that little was spent la et presentation d'une serie refletant operations de pccherie. donnees soulignent que dans cette region la p@che de krill etait localisee, dans un la bordure du plateau sur la c6te nord de l'ile. plusieurs chalutages (en moyenne 1993,9,9 en 1995 et 7,O en 1996), et les taux de capture la traits sont par un pour determiner le temps necessaire pour chacune des phases d'une operation pgche. La mise B l'eau et la remontee du chalut sont en general duree la p@che m@me est plus prolongee et de duree plus variable. entre deux traits presque aussi prolong6 phase de p@che et presente un niveau semblable de variabilitk. La distance parcourue d'un chalutage a un autre est le plus souvent courte, ce qui entendre que recherche d'essaims exploitable ne necessitait qu'un d'effort de p@che restreint. L'intervalle de valeurs decrivant la pccherie en evidence des les annees : 1995 etait meilleure saison 1996. Les la variabilite a echelle aux anciennes tentatives donnees de p6che deriver des Trathan et al. B pe3ynbTaTe aHanA3a AaHHbIX II0 OTAenbHbIM TpaneHHXM, BbInOnHeHHbIM TpaynepaMH, ocyqecTsnaBmmm npoMbrcen KpHnrr B pafio~e K)x~ofi l-eopr~u 3a nepr?on 1994-1996 rr., 6b1n nonyYeH prr~ onEicaTenbHbIx no~a3a~eneii npoMbrcnosbIx 0IIepaqHfi. CO~~~CHO 3THM lIOKa3aTeJlRM IlPOMbICeJI KPHnX j' K)XHO~~ reoprEiEi, HOCABIUH~~ reorpa@nuec~~ cocpeno~ove~~b~fi xapaeTep, npoBoAancrr B OrPaHHVeHHOM pafi0~e - BnOJIb rPaHAQbI LUenb@a Y CeBePHOrO no6epemba OCTpOBa. EX~GH~BHO KaXnOe CYAHO BbIIIOJIHIInO HeCKOnbKO Tpane~Hfi (B CpeAHeM 7,9 B 1993 r., 9,9 B 1995 r. H 7,O B 1996 r.), npwieM ynosbr 6b1n~ KpynHee B cepeAHHe ~HX. O~nenb~bre TpaneHHrr 6b1n~ paccMoTpeHbI c qenbm onpeneneHm Toro, CKonbKo BpeMeHM Tpe6yeTCx AnX BblnOJIHeHHR KaKp;AOrO 3Tana npOMbICnOBbIX ollepaqllfi. B~~Mx, 3aTpaqeHHOe Ha YCTaHOBKY A B~I~OPKY CeTH, O~~IYHO 661~0 KOpOTKllM H Man0 kl3MeHIIJIOC6, B TO BpeMII KaK nepHOA @~KTI?~~CKO~O BeAeHHX IIpOMbICna 66111 6onee IIpO~OJIXATe~bHbIM H ll3MeHYHBbIM. Bpe~x MeXAy IIOCJIeAOBaTenbHMMH TpaneHllXMH 6b1no IlOYTLl ~a~0fi Xe npOAOnXllTeJIbHOCTll H Ta~0fi Xe CTeneHki H3MeHYABOCTH, YTO M nepllOA BeAeHHR npOMbICna. TOT @~KT, YTO PaCCTORHAe MeXAy IlOCneQOBaTeJlbHbIMH TpaJIeHHRMH O~~I~HO 661~10 H~~OJI~UIAM, rOBOpAT 0 TOM, YTO Man0 BpeMeHH 3aTpaqllBanOCb Ha nOI4CK KOMMepYeCKAX ~0qe~~paQIifi KpAJIII. PRO OnKcaTenbHbrx no~a3a~enefi y~a3brsae.r Ha pa3n~q~11 Mexny ronam, npwveM 1995 6b1n 6onee "YA~YH~IM" ~OAOM, Hemem 1994 HnM 1996 rr. Bonpocbr M~~oM~cLUT~~HO~~ M3MeHYHBOCTI.1 O~CYKA~ZOTCX Ha OH^ IIPeAbIAY~HX IIOnMTOK CMO~enHpOBaTb npOMbICnOBbIe AaHHbIe H PaCCsHTaTb HHAeKCbI VHCJIeHHOCTM, YYBCTBHTeJlbHbIe K ll3MeHeHMRM B ~HOM~CC~. COCP~AOTOY~HH~I~~ XapaKTep IIpoMbICJIa y K)XHO~~ re0prHA rOBOPAT 0 B03MOWHOCTH IIpHMeHeHMR IIpOMbICnOBbIX HHAeKCOB An% ynpaeneaurr, B CBX~H c YeM peKoMeHAyeTcx npoeeAeHMe nanb~efiruero a~an~sa. Resumen Se efectuo un andisis individual de 10s datos de 10s arrastres realizados por barcos pesqueria del del Sur entre elaboraron varias medidas descriptivas que reflejan las operaciones pesqueras. medidas del Sur se en un krea reducida del isla. Cada barco realizo varios lances diarios (promedio 7,94 en 1993, 9,89 en 1995, y 6,96 en 1996), y 10s arrastres del mediodia dieron de captura 10s arrastres en forma individual establecer el tiempo requiere para cada las operaciones general el empleado el lance red es corto variacion, en tanto que el periodo de pesca es mis mayor variabilidad. consecutivos fue como el demostro niveles similares distancias recorridas lances consecutivos fueron por 10 pequeiias, indicando que empleb escaso esfuerzo en la bdsqueda de cardumenes explotables mis all5 las aguas circundantes. rango de las medidas descriptivas de la pesqueria indica hub0 diferencias interanuales, que las considerados en relaci6n tentativas anteriores cuyo era modelar 10s las pesquerias derivar indices sean sensitivos 10s cambios de la pesqueria se concentra geograficamente area reducida de Georgia del Sur indica que 10s las pesquerias utilidad para 10s fines de ordenacion, y por lo tanto un analisis adicional mas detallado seria conveniente. Georgia, krill fishing, bathymetry, shelf-break, fisheries for Antarctic catch levels ensuring that adequate abundance. The approach to derived from Trathan et al. fishing period: between the start between haul: the time between the one haul record also contains single nominal the haul (at a between consecutive hauls was estimated as distance between these database record contains the haul. Thus the period (kilogram per minute). the data was made using statistical analyses with the program Positional information hauls were Geographic Information established using Arc/Info software (Trathan 1993a) digital coastline (McDonald bathymetry digitised Office, 1992). Although the in the latter the number from that year is carried out those years that which the full season's have been i.e. 1994,1995 Present in the May 1994 fishing vessels from Japan, individual hauls. reference, each (Figure 1). was variable fishing vessels operating in vessels from were present on a more regular with three vessels present in each season and some years similar times. arrived within two days 14). Similarly, some years vessels from the same nation example, in the same Within their main fishing season some fish for prolonged periods, days was variable between in 1994,307 different fleets were present there was reasonably well-defined fishing May, or in early ended in limited number hauls were taken outside these dates. eight hauls hauls during hauls which occurred outside the main season have subsequent analyses reported in this fishery operated along the the continental little fishing activity deep water. Office, 1992); edge is very short distance (Figure 2). was restricted Cape Charlotte The fishery close to this bank throughout the entire season (Figures 3a, little activity elsewhere in area than (Figure 4). the early the season were usually small area of hauls per In each separated by distances which were larger. each year generally similar, hauls separated by less determine whether the average between consecutive the different the same fishing season, was used. the analysis the distance between hauls was significantly different for the different (F3,1996 = 1.48; P � 0.200). This is the bank Charlotte (Figure 3). the distance between hauls was significantly different the different the season (Fs30a = 16.90; F4,z822 = 6.44; P respectively). This difference is hauls evident in S), the fishery being more tightly clustered in tightly clustered After each complete, the distance dependant upon the strategy the fishing master, for example the same patch on completely different patch. between hauls will be than the actual distance determine whether used this approach, the distance between was compared the fishing operation 1994, 1995 respectively, the average time shooting the net completing the nominal distances much greater than the mean distance between repeatedly targeted the same patch. Maximum catch size is generally constrained the time needed to ensure that the catch does not deteriorate before processing Thus, in the were generally restricted to less than 8 tonnes per haul, both the Japanese 1988a) Soviet Union fleet (Dolzhenkov et South Georgia catches often larger than this (Figure 6), though individual catches varied was lowest intermediate in highest in The total recorded catch was 17 tonnes in the Japanese the largest between fleets were also evident in the average size Poland consistently variance indicated (kilogram per haul) was different in 0.001), was the average rate (kilogram per minute) (F2,7909 = 344.11; P catch rates were higher 1994 or 1996, masked some differences between for example the actually lower in were no areas where rates were always high, season almost rates which were fishing area over the bank to the Cape Charlotte. Thus, the rates (kilogram per for each to the area the fishery catch rates generally occurred during June became more infrequent though in they also continued into the fishing seasons, vessels operated continuously night as well as slightly greater hauls made indicated that at different 8) were the fishery moved aggregation characteristics at different times exploit other along the Everson, 1982). Die1 Why vessels krill could from this bank is unclear, although relates to availability example at levels close the seasonal Around South Georgia fishing occurred the day, with hauls made day and on average, short duration shoot the the net only limited variability. comparison, the time the time hauls was many hauls the distance between consecutive hauls the nominal distance travelled along the reciprocal course to fish the same patch. Occasionally vessels relocate before the regular relocations occur all times restricted to a particular period. within 2 the previous 1O0/0 km. Such a pattern operation suggests the time over the fishing is directed time is searching beyond the near fishable krill fishery thus appears highly directed, little exploration beyond known concentration; there little time searching, relocating, little time lost bad weather. The catch haul and rates per 5) were extremely variable, significantly between years. Catches fleets (Table Polish catches catch rates being substantially Ukraine. The the difference between differing fishing strategies with the In general the hauls with the highest occurred in the east the region, bank north (Figure 7). these hauls occurred continue into August. In each year were higher than at night g), situation possibly related to differing 1985). Availability well as differences in the considerations regarding the potential have been recognised (Dolzhenkov et Management Implications the Operational Description Georgia fishing activity occurs almost exclusively narrow band wide along 4 and 5), particularly at the contrasts markedly with the distribution acoustic surveys, for example et al. shown that krill occur over the at the It is therefore interesting only some targeted by the fishery. the character affected by et al., 1982), primary production (Hamner et El-Sayed, 1985) (O'Brien, 1987), ontogenetic migration 199313). the cause, it is likely certain character can fished profitably 1988b), these mainly after year those areas predictable concentrations highlights the conservative character the fishery at South Georgia. These areas, such as of Cape Charlotte, highest levels available krill in the area, particularly the main fishing season these areas it is krill availability the availability within the traditional fishing the availability at South Trathan et Hobart, Australia. T.G. Lubimova, krill biology (SC-CAMLR-SSPIS). CCAMLR, Hobart, Australia: 237-252. Endo, Y. and T. Ichii. 1989. CPUEs, Antarctic krill 1987/1988 ground north (SC-CAMLR-SSPI6). Hobart, Australia: 323-338. Everson, I. 1982. in mean (Et~phausia superba) patch. J. Plankt. Res., 4: 155-161. Everson, Marine interactions. In: Laws, Everson, Springer-Verlag, Berlin: Everson, in the Fedoulov, P.P., in the South si~perba: Abundance, distribution Euphausia superba between 15 30°E during FIBEX. Springer-Verlag, Berlin: Approaches to South Georgia. Admiralty Ichii, T.M., M. penguins in the aggregations in 127-146. J.W. Thomson. 1:250 Survey, Cambridge: Mangel, krill fleet. (SC-CAMLR-SSPIS). Hobart, Australia: J.W.S. 1962. Antarctic krill Miller, D.G.M. 1989. Biology Antarctic krill Dana): a review. BIOMASS Sci. Ser., Everson from the waters (SC-CAMLR-SSPI8). CCAMLR, Hobart, Australia: 225-244. Murphy, E.J., P.N. Trathan, I. Everson, G. Parkes and F.H.J. Daunt. 1997. Detailed distribution of krill fishing around South Georgia. CCAMLR Science, 4: 1-17. O'Brien, (Crustacea: Euphausiacea), J. SC-CAMLR. 1985. the Fourth (SC-CAMLR-IV). Hobart, Australia. SC-CAMLR. 1993. Tzuelfth the Scientific Hobart, Australia. Trathan et each vessel. Mean catch ram per haul). median with quartife. rate (kilogram per for each year. Mean, median with third quartile. Q1 1.1 1.8 1.8 Mean Catch per haul Q1 Catch rate 6 147 10 500 Trathan et - 54 S n- Year 1994 Month 5 n Year 1994 Month 6 - individual hauls krill fishing vessels is identified Trathan et al. \ Year: 1996 Month: 6 Trathan et al. (kilogram) from hauls made by krill fishing vessels Georgia. Top middle panel bottom panel High catch rates 4 Positions for catch rates (kilogram year. Cape Charlotte is identified by Trathan et Nombre moyen effectues navire et mediane Duree moyenne diffQentes phases du processus de psche. Moyenne, ecart-type mediane premier et kilom6tres entre les traits consecutifs pour chaque navire. Moyenne, ecart- type (SD) et mediane premier et troisieme quartiles. annee (kilogrammes par trait). Moyenne, kart-type (SD) et mkdiane premier et troisieme quartiles. trait) et taux annee. Moyenne, (SD) et mediane premier et troisieme quartiles. 1: Figure 2: Figure 3: Figure 4: Figure 5: Figure 6: Figure 7: Figure 8: Pbriodes d'operation des navires de psche de krill en Georgie 3 et 4 (Japon), 9 et et navires 11, 12, 13, 15 (Ukraine). Figure Bathymetrie B proximite de la GPorgie Sud (Hydrographic Office, 1992) cap Charlotte est indique divers traits effectues par les navires pgchant le krill autour de la Georgie du Sud en 1994; a) mai; b) juin; c) juillet; d) aoQt. cap Charlotte est indique traits effectues les navires p@chant le krill Gkorgie juillet; c) ao6t; cap Charlotte est indique divers traits effectues par les navires pschant le krill la Georgie du Sud juin; c) juillet; aoQt; cap Charlotte est indique Capture par trait (kilogrammes) divers traits effectues par les pechant le krill autour de la Georgie du Sud. Figure du haut : 1994, du milieu : 1995 et du bas : 1996. Position des 10% de taux de capture les plus eleves par minute) annee. cap Charlotte est indiquk cases et lignes verticales (kilogrammes chaque trait effectue par les navires pechant le krill pres la Georgie premier quartile (Ql), le haut, au troisieme quartile (Q3) et la ligne proche mediane. lignes verticales partent des quartiles pour atteindre les observations des points le plus faible et le plus eleve a l'interieur des secteurs definis en tant que Q1 - 1,5 (Q3 - Q1) et Q1 1'5 (Q3 - Ql). Figure du haut : 1994, du milieu : 1995 et du bas : 1996. Trathan et al. Lista de las figuras Figura 1: Figura 2: Figura 3: Figura 4: Figura 5: Figura 6: Figura 7: Figura 8: Periodos de pesca de 10s barcos pesqueros de kril en Georgia del Sur. Barcos 3 y 4 barcos 5, 6,7,8,9 y 10 (Polonia), y barcos y 15 (Ucrania). Sur (Oficina Hidrogriifica, 1992), con is6batas encuentra identificado por iniciales CC. 10s barcos Junio; (c) Julio; Agosto. Cabo encuentra identificado iniciales CC. 10s barcos pesqueros de kril en Georgia del Sur en 1995: (a) Junio; (b) Julio; (c) Agosto; Septiembre. Cabo Charlotte iniciales CC. individuales efectuados por 10s barcos pesqueros de kril en Georgia del Sur ell (e) Septiembre. Cabo Charlotte se encuentra iniciales CC. Captura por individuales efectuados barcos del Sur. las tasas de captura mas todas las capturas, kilogramos para cada Cabo Charlotte iniciales CC. lineas por minuto) el transcurso del dia, de 10s lances individuales efectuados por 10s barcos cada barra esta primer cuartilo (QS), el tercer linea cercana a la mitad es lineas verticales son las que se extienden desde 10s cuartilos hasta las mas bajas que aun se encuentran dentro de las regiones definidas como 1.5 (Q3 - Q1) y Q1 + 1.5 (Q3 - Ql). Cuadro superior 1994, cuadro mediano 1995, cuadro inferior 1996.