Résultats de la recherche
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The survivorship of rays discarded from the South Georgia longline fishery
/ Description: Post-haulage survival experiments were conducted on 95 Raja sp. anon. cut off longlines at the ... season in Subarea 48.3. Capture depth had a consistently significant influence on the mortality of skates ... ) and the sex of rays also had some small influence on survivorship. Discard survivorship was 75% in ... can also be used to calculate the expected skate mortality within the fishery, based on depth of ... 12 hours, adjusted for the ‘50% survivorship’ category of Table 1. 0% 20% 40% 60% 80% 100 ... vessel for a period of up to 12 hours. Eight insulated experimental tanks were instal- led on the ... oxytetracycline (OTC) for future growth validation on recapture. These animals were released back into the open ... a spline on depth established that a three-order polynomial was a good approximation for the depth ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 155–164 : Auteur(s): Endicott, M. and D.J. Agnew
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Status of the krill stock around Elephant Island in 1991/92 and 1992/93
. The length frequency distributions and maturity stage composition reflected relatively good year class ... success from the 1990/91 spawning season but poor success from 1991/92. Year class success from these and ... austral summers of 1991/92 and 1992/93 are described and compared with information from previous years ... other years appears to be associated with female maturity development and spawning during the early ... maturity development during early summer is an important factor influencing year class success, due to ... recruitment for the 1991/92 year class. The apparent failure of the 1991/92 year class supports this ... . Loeb and Siege1 (Dlink/Dmax) *l00 Variable 1---10---20---30---40---50---60---70---80---90---~00 ST ... ST-4 3 ST-59 -7 ST-58 -L ST-71 ST-4 4 ST-72 (Dlink/Dmax)*100 Variable 1---10---20---30---40 ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 7–33 : Auteur(s): Loeb, V. and V. Siegel
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Some specific features of the USSR krill fishery and possibilities of applying fishery statistics to studies of krill biology and stocks
the vessel rather than with krill abundance in a certain area. During preparations for regular fishing ... -term behaviour patterns have an impact. All these factors limit the extent to which CPUE can be used in ... instrument for studies. File: 04-Dolzhenkov-et-al.pdf ... operations very short hauls (under 15 minutes) are practised. Such fishing practice, together with ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 237–252 : Auteur(s): Dolzhenkov, V.N., T.G. Lubimova, R.R. Makarov, S.S. Parfenovich and V.A. Spiridonov
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Age and growth of Antarctic euphausiacea (crustacea) under natural conditions
Peninsula and the south-eastern Weddell Sea. Life spans range from two years for Euphausia frigida to six ... years for the krill Euphausia superba. Growth in length and weight was calculated by non-linear ... eastern Weddell Sea. Former opinions that differ are discussed. Seasonal growth was re-analyzed for the ... species Euphausia triacantha, and a three-year life span proposed. Male Euphausia crystallorophias have a ... south-eastern Weddell Sea. Life spans range from two years for Euphausia frigida to six years for the ... . Former opinions that differ are discussed. Seasonal growth was re-analyzed for the species Euphausia ... triacantha, and a three-year life span proposed. Male Euphausia cr¥stallorophias have a shorter life span ... least twice and in some cases three times during their life, except for E. frigida which spawns only ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 369-370 : Auteur(s): Siegel, V.
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Statistical power to detect changes in growth rates of Antarctic fur seal pups
Abstract / Description: Numerical simulations were used to investigate the power of methods for detecting ... changes (between years) in pup growth rates, the loss of power associated with obtaining weight samples on ... Method (50 pups of each sex, weighed on four dates at 28-day intervals) would result in the ability to ... for each year and as weighted averages of both years. Growth Rate Standard Error (kg/d) of Growth ... computed separately for each sex and year. Bartlett's test was used to evaluate heterogeneity of variances ... dates, for either sex in either year (P > 0.13 in all cases). Table 2 shows estimates of growth rates ... ------- ------- Females ------- mean mean Date n weight (kg) s.d. n weight (kg) s.d. 1988: 2 Jan 30 9.91 1.60 20 8.78 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 399–409 : Auteur(s): Boveng, P., J.L. Bengtson and M.E. Goebel
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Abundance, size and maturity of krill (Euphausia superba) in the krill fishing ground of Subarea 48.1 during the 1990/91 austral summer
sampling surveys for krill were conducted in the krill fishing ground north of the South Shetland Islands ... were generated, suggesting that hydrodynamic convergence might be responsible for accumulation of krill ... been lower than expected until early February 1991. As for maturity stages of krill, spawning krill ... neritic and nearshore zones. This indicates that slope frontal features may be important for the formation ... 1991 (Figure 1). Transects ran in an offshore-inshore direction with 20 n miles between the transects ... NOAA-A satellites. Typically, twelve locations per day were recorded for each buoy with an accuracy ... biomass estimate for the inshore region, this region was divided into two zones: neritic and nearshore ... ) 188 where Bi = biomass for i-th zone Ai = area for i-th zone. The total biomass (B t) for an ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 183–199 : Auteur(s): Ichii, T., H. Ishii and M. Naganobu
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Assessments of by-catch in trawl fisheries at Heard and McDonald Islands
/ Description: This paper assesses the potential for the commercial trawl fisheries in the Heard Island area ... skates). The long-term annual yield for each of the three taxa was estimated using the generalised yield ... from the local area. Where possible, values for missing input parameters were obtained from the ... literature, for the same species from other areas, otherwise proximate data for similar species elsewhere in ... than 0.1 over a 20-year period. The lowest y satisfying these rules was determined for the three ... 0 20 0.2 for C. rhinoceratus WG-FSATWG-FSA-97/30). L. squainifrons 1 25 11 360 0.1 ... the longer term. Two analyses were undertaken. First, estimates of long-term annual yield for each ... between two values near to the critical level. Constable et al. The input parameters for the ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 231–243 : Auteur(s): Constable, A.J., R. Williams and W.K. de la Mare
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Size compositions of males and females in the course of the life cycle of Euphausia superba
during the reproductive cycle. Information on size composition by sex is considered to be vital for an ... , using samples from different years. The observed variations were related to stages of krill maturity ... dates on which the reproductive cycle stages occurred. For this reason an analysis of the stages of ... composition by sex is considered to be vital for an understanding of krill population structure. It is ... ) will help researchers to develop an optimal sampling strategy for the subsequent thorough analysis of ... ..... ... %30~ ! \:'" ,,-00, '"1 '\ 64-38S 47-00E if 16~ ~ 13.1.84 ,,/ \ 16.1.84 166 I ...:---'\. \! 20 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 3–16 : Auteur(s): Makarov, R.R.
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Distribution and size of Antarctic krill (Euphausia superba Dana) in Polish commercial catches taken in the Atlantic sector of the Southern Ocean from 1997 to 1999
shorter, therefore it must be assumed that there are factors other than daylight which have an impact on ... concentrations, average trawling depths, derived using an echosounder, were recorded separately for each haul ... – 12 4 12 5– 14 9 15 0– 17 4 17 5– 19 9 20 0– 22 4 22 5– 24 9 E le ph an t I sl an d ... (% ) Elephant South Shetland 1999 0 5 10 15 20 25 30 35 40 45 50 55 60 Length (mm) Fr eq ue nc y ... f t he So ut he rn O ce an , f ro m 1 99 7 to 1 99 9. 0481216 25 30 35 40 45 50 ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 83–105 : Auteur(s): Jackowski, E
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The Soviet krill fishery in the Atlantic Sector of the Antarctic from 1977 to 1991: fishing effort distribution and interannual patterns
from 1977 to 1991 was 50 086 vessel-days fished, in Subareas 48.3 (45% of the total for the period ... : fishing effort distribution and interannual patterns Abstract / Description: Data on the Soviet krill ... 0 0 0 0 0 0 0 91 7 1. 8 R T M S 92 86 30 4 39 6 20 6 20 2 11 6 89 ... r tr aw le r, p ro je ct ‘A tl an ti c’ , 2 65 7 G R T , M L 8 2. 20 m , M E P ... . The data from Anon. (1978–1992) show the fol- lowing two main reasons for changing the subarea fi ... catches (tonnes/hour) Fr eq ue nc y (% ) 30 25 20 15 10 5 0 9–10 9 Soviet krill fi shery ...
Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 1–13 : Auteur(s): Litvinov, F.F., V.A. Sushin, G.A. Chernega and O.A. Berezhinsky