Search results
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Notes on the use of virtual population analysis for stock assessment of the mackerel icefish, Champsocephalus gunnari (Lönnberg, 1906) in Subarea 48.3 for the 1990/91 and 1991/92 seasons
techniques, from 1991 back to 1977. The predicted age structure, dominated in recent years by the 1987 year ... back to 1977. The predicted age structure, dominated in recent years by the 1987 year-class (1 year ... -class (1 year olds in 1988), was quite robust, despite the use of various combinations of survey ... proportion of 5 year olds, which was not observed during the survey on Falklands Protector in January 1992 ... . The predicted age structure, dominated in recent years by the 1987 year-class (1 year olds in 1988), was quite ... in the region of 40 to 50% of the fishable biomass (age 2+*) would be composed of 5 year olds. Accordingly, TAC ... index was simply derived as follows: For years y and ages a with both survey indices lay and CPUE ... r U 2 a a (4) where la is the mean survey index at age a over all years and U a is the mean CPUE index at age a over ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 49–79 : Author(s): Parkes, G.
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Growth and age/length structure of populations of Notothenia (Lepidonotothen) squamifrons (Nototheniidae) in various areas of the Indian sector of the Southern Ocean
Paper Title: Growth and age/length structure of populations of Notothenia (Lepidonotothen ... : Age, growth and age/length composition of populations of grey rockcod (Notothenia (Lepidonotothen ... g at the banks and 153 to 188 g in the Kerguelen Island area were recorded for fish at age 6 to 12. Growth ... parameters were calculated according to Bertalanffy’s equation. The dynamics of age/length composition ... of different age. 132 2500 2000 0> 1500 'I 'I 'I 1000 500 fO 20 30 Y Y 'I 40 ... age data. This species is characterized by a long life cycle; 15 year old specimens were recorded ... to 120 g/year) and at age 7 to 12 in the Kerguelen Island area (155 to 188 g/year). It must be noted ... of its theoretical maximum length and one-third of its maximum body weight at the age of 9 years ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 123–139 : Author(s): Zaitsev, A.K.
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Otolith and body size relationships in bigeye grenadier (Macrourus holotrachys) in CCAMLR Subarea 48.3
, Subarea 48.3 0 10 20 30 40 50 60 70 80 90 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 ... in the text. 90 80 70 60 50 40 30 20 10 0 40 35 30 25 20 15 10 5 0 5.0 4.5 4.0 3.5 3.0 ... h (c m ) 90 80 70 60 50 40 30 20 10 0 Fi sh to ta l l en gt h (c m ) 10 ... -6 L(t)2.93 (r2 = 0.8221, bottom). 0 10 20 30 40 50 60 70 80 90 10 15 20 25 30 35 40 Anal length ... size models should be derived for each fish population under investigation. The length of fish chosen ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 133–143 : Author(s): Morley, S. and M. Belchier
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An assessment of the mackerel icefish (Champsocephalus gunnari) off Heard Island
, based on the data collected during the surveys, including growth curves, natural mortality, ages ... collected during the surveys, including growth curves, natural mortality, ages and sizes of maturity ... age structures in the same year and appear to have differences in their growth curves ... error of the estimate 2 . The resultant estimates of M are 0.30 (yr.') for age 2 and above and 0.64 ... for the Heard Plateau is 275 mm. The growth curve gives a mean length for fish aged one year less than the age ... 1 237.0 821.0 20.5 175.0 Age 2 1988 Cohort Density Std Error 0.0 0.0 0.0 0.0 0.0 0.0 Age ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 79–101 : Author(s): de la Mare, W.K., R. Williams and A.J. Constable
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The gentoo penguin as a candidate species for the CCAMLR Ecosystem Monitoring Program
years at Bird Island, South Georgia and at the South Shetland Islands (both within Integrated Study ... of special relevance to the CEMP. File: 30-Croxall-and-Williams.pdf ... Based on dietary and other biological information collected over several years at Bird Island ... on land throughout the year. 4.2 Early Sexual Maturity With typical ages of first breeding being ... WG-CEMP-90/14 THE GENTOO PENGUIN AS A CANDIDATE SPECIES ... and other biological information collected over several years at Bird Island, South Georgia ... , Cambridge CB30ET, UK 483 Resumen Basandose en la informaci6n dietetica y bio16gica recopilada ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 483–488 : Author(s): Croxall, J.P. and T.D. Williams
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Modelling krill recruitment
A, is the number of animals in age class i, and n is the age of the oldest age class present in non-negligible ... , is the ratio of numbers in age class t to the numbers in that age class and above, that is: where ... , the proportion of recruits is a function of S, the survival rate from one age class to the next, which is given ... by: If M is assumed to be independent of age up to age n, and infinite thereafter, then in an equilibrium population ... Paper Title: Modelling krill recruitment Abstract / Description: A method is developed for using ... for generating families of recruitment functions which are consistent with the statistical uncertainty ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 49–54 : Author(s): W.K. de la Mare
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The error of the biomass estimate as a function of survey parameters and the statistics of a density field of krill aggregations
of values tp depending on ~ can be found in any book on mathemati- cal statistics. Thus, passing from ... rHAPoaKYCTHqeCKOA C'beMKH napaMeTpbl aHH30TponHH, paAHYC KoppennqHH B~onb pa3pe30B H K03~HqHeHTbI BapHaTHBHOCTH ... KoppenHqHoHHoro 3nnHnca H qaCTOTa pa3pe30B (ceKqRA) CnY>KaT napaMeTpaMH C'beMKH. OnHcaHHble 3AeCb COOTHoweHHH ... MoryT Ha npaKTHKe Hcnonb30BaTbCH KaK~nH nocne~y~ero onpeAeneHHH oum6KH, c~enaHHoA npH BblqHCneHHH ... is determined as the product of the average density for the region under examination and the area of ... this region. For a hydroacoustic survey, the anisotropy parameters correlation radius along transects ... (sections) serve as survey parameters. The relationships described here can be used in practice for both a ... posteriori estimation of the error made when calculating the biomass, and for survey planning on the basis of ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 213-228 : Author(s): Kizner, Z.I.
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Environment–krill relations in the South Georgia marine ecosystem
expressed strongly in years of extreme conditions. The correlation with water temperature was more ... expressed strongly in years of extreme conditions. The correlation with water temperature was more ... . 1994. Reproductive performance of female Antactic fur seals: the influence of age, breeding ... 7 7 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 Year Figure 3: Variation in CPUE indices ... a E k- O i l I l l i l l l l l l l l l , , , , , , , , , , , , , , 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 Year Figure 9: Interannual variation in sea-water ... 0 80 (a) 0 0 c 70 0 . 5 60 O 8 2 S 5 0 ~ O o 0 W 4 0 - 3 0 r = 0.57 8 30 , 20 ...
Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 13–30 : Author(s): Fedoulov, P.P., E. Murphy and K.E. Shulgovsky
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A functional division of Electrona carlsbergi (Tåning, 1932) area of habitat in relation to the latitudinal zonation of the Southern Ocean
in the Southern Atlantic along two meridional transects at 17° and 20°W in the latitudes from 37°30' to 55°30 ... survey was conducted in the Southern Atlantic along two meridional transects at 17° and 20° ... ;W in the latitudes from 37°30' to 55°30'S. The survey was mainly focussed on studies of distribution ... o ,----------------" I "~,,- A I I \ [,-"j \: , .! / \ , , I , , I X / I ~\ I \ I ! ~ \ I J ~ \ / E.carlsbergi St.ages of mat.urit.y females I I III ___ _ IV __ V 62 61 60 37 57 41 56 42 43 55 ... . • I. SAZ St.ages 0 of 7.0 8.0 9.0 10.0 11.0 CM mat.urit.y 11 III-V • I., STFZ 100 11 11 50 ... boundary of the STFZ passed between 38° and 39°S and the southern boundary between 41°30' and 42°S at 200W ... ° to 53°S. At 17°W the southern boundary of the PFZ passed between 54°30' and 55°S. However, water ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 369–395 : Author(s): Zemsky, A.V. and S.A. Zozulya
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Biology and harvesting of Dissostichus eleginoides around the Kerguelen Islands (Division 58.5.1)
from year to year and highly dependent on the harvestable resources of Champsocephalus gunnari. Vital ... of the stock. Fishing effort and corresponding catches are very variable from year to year and highly dependent ... 100 cm sont ainsi ages d'environ 11 ans et les individus de 160 cm depassent une lecture de 17 ans ... correspond aux classes d'age VI et VII) et les femelles (70 et 80 cm soit les classes d'age VII et VIII) et ... determination ulterieure de l'age, analyse et prelevements de gonades pour l'etude de la maturation sexueIle et ... profondeur, montrent bien cette migration des poissons les plus ages vers les grandes profondeufs (Figure ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 85–106 : Author(s): Duhamel, G.