Search results

1. Trends in population size and breeding success at colonies of macaroni and rockhopper penguins, Marion Island, 1979/80–1995/96

   of those eggs that hatched (chick survival) the mean numbers of eggs hatched and chicks fledged per ... River were not significantly correlated to those at the other colonies (Table 1). The mean number ... Boogaard River in 1989/90) and 0.83 at Archway Bay in 1985/86 (Figure 3). The overall mean number ... % at Macaroni Bay in 1989/90. The overall mean value for chick survival was 72% (n = 4 312). Trends in chick ... . The only significant relationship between inter-season trends in the number of pairs breeding at the ... period, while the other remained stable. Trends in the number of pairs breeding at the three rockhopper ... of macaroni penguins were significantly correlated in all three inter-colony comparisons over the ... were significantly correlated in only one of the three inter-colony comparisons. The greater coherence ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 89–103 : Author(s): Cooper, J., A.C. Wolfaardt and R.J.M. Crawford

2. Preliminary model of krill fishery behaviour in Subarea 48.1

   ~ ~ H B M H ~ C T O H H 3JIeaaHT B YepeAyWqHeCR TOAbI, IIpMBeAeT K CpeAHeMy roAoBOMy BbIn ... OBy, K O T O P ~ I ~ ~ 6 y ~ e T aHanormeH cospeMeHHoMy. T ~ M He MeHee, B TOM cnyqae B TerIeHMe YepeAymwHxcrr neT BbIn ... distributed and accordingly er,, was sampled from a log-normal distribution with mean ln(cpue),, taken from ... Table 1. However, since sample sizes in Table 1 varied considerably, an approximate mean CV of 0.4 ... :  A simple model of the behaviour of the krill fishery in FAO Statistical Subarea 48.1 (South Shetland ... catches in the subarea. A number of management scenarios are considered which involve the closure of (i) a ... . However, in this scenario, the catch would be more concentrated in foraging areas of land-based predators ... Paper Title:  Preliminary model of krill fishery behaviour in Subarea 48.1 Abstract / Description ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 71–79 : Author(s): Agnew, D.J. and V.H. Marín

3. Variations in echosounder calibration with temperature, and some possible implications for acoustic surveys of krill biomass

   according to the equation of Francois and Garrison (1982), and from these a mean sound velocity through ... 1. Multiple calibrations of each transducer were conducted on each of these occasions. Mean S, and TS ... << 0.001 Mean Calibrated ... of the transducers (approximately 6 m) was typically 2.3"C, whereas in Uggdalseidet Fjord it was 16.6"C. Mean ... were taken of the differences in gain settings, then integrated 120 kHz echo signals would be under ... biomass by acoustic techniques is dependent on a number of factors of which one of the most fundamental is ... those applied in the Antarctic, even after adjustments have been made to account for differences in ... -reported by 2.8 dB, leading in turn to an under-estimation of krill biomass by 52.5%. Every effort should ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 273–281 : Author(s): Brierley, A.S., C. Goss, J.L. Watkins and P. Woodroffe

4. Analysis of trends in Japanese krill fishery CPUE data, and its possible use as a krill abundance index

   pseason:bssmu.f (Candy, 2004) and setting month.ns to its average value of 5.4. This means that different BSSMUs ... of predictions and simple annual means of actual data of the three CPUE indices for the whole of Area 48 across ... compared to the other two CPUE indices. The inter annual trends in actual mean values showed different ... patterns from those of the standardised indices. However, since the trends observed in the simple mean ... critical level of krill availability which is just enough to maintain the best factory performance. In this ... analysis the status of fishing in Subareas 48.1 and 48.2 was not clear. A linear correlation was observed ... Paper Title:  Analysis of trends in Japanese krill fishery CPUE data, and its possible use as a ... Japanese krill fishery for the 1980/81 to 2003/04 fishing seasons were analysed. For a number of ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 1–28 : Author(s): Kawaguchi, S., S. Candy, S. Nicol, K. Taki and M. Naganobu

5. An assessment of toothfish in Subarea 48.3 using CASAL

   to estimate population size, was calcu- lated by taking the total catch by licensed vessels divided by mean ... ., 2006a) to be between 5 and 11%. A conservative value of 10% (i.e. immediate tagging survivorship of 90 ... , with mean proportional to the model-predicted vulnerable biomass, and variance consisting of two ... of toothfish and its relatively low growth rate. One means of comparing values of different biological ... Paper Title:  An assessment of toothfish in Subarea 48.3 using CASAL Abstract / Description:  This ... paper presents an assessment of the stock of toothfish around South Georgia (Subarea 48.3) using the ... CASAL stock assessment software (Bull et al., 2005). Detailed attention is given to the incorporation of ... as much of the available tuning data as possible, as well as a whole range of assessment ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 65–95 : Author(s): Hillary, R.M., G.P. Kirkwood and D.J. Agnew

6. Calibration of an acoustic echo-integration system in a deep tank, with system gain comparisons over standard sphere material, water temperature and time

   of temperature, standard sphere and time, is 2.1 dB, i.e., 0.8 dB less than the total range ofTS gain ... Foote et al. (1984a and b) stated that precision calibrations to within 0.5 dB are possible by means ... , the error of estimating mean target strength will be 1 dB (Tesler, 1989). Robinson and Hood (1984) asserted ... , a commonly used echosounder and a short pulse length, the error in mean target strength estimates of animals ... Paper Title:  Calibration of an acoustic echo-integration system in a deep tank, with system gain ... sphere. It presents the results of an extensive calibration of a Simrad EK500 scientific echosounder with ... length (0.1, 0.3 and 1.0 ms), target depth (0.8 to 7.5 m), and time (149 days). The total range in TS ... gain, including the effects of temperature, standard sphere and time, is 2.9 dB. Gain values calibrated ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 127–144 : Author(s): Demer, D.A. and R.P. Hewitt

7. Differences in distribution and population structure of krill (Euphausia superba) between penguin and fur seal foraging areas near Seal Island

   cercanas a la costa. 1. IN1RODUCTION The Seal Island area is one of the active sites in the Antarctic ... Distribution ofKrill In the inshore foraging areas krill undertook diurnal vertical migrations, tending ... in the region. 3.5 Size and Maturity ofKrill As shown by accumulated size composition data for each foraging ... . This means that for penguins, the amount of energy delivered to the chick per trip is limited, i.e ... the surface throughout the day. With regard to body size and maturity of krill in the inshore foraging ... dominant with occasional occurrences of juveniles (modal length 21 mm). In contrast, in the offshore ... Paper Title:  Differences in distribution and population structure of krill (Euphausia superba ... in inshore regions where krill frequently occurred but higher density areas of krill (~250 g/m 2 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 273–285 : Author(s): Ichii, T., H. Ishii, J.L. Bengtson, P. Boveng, J.K. Jansen and M. Naganobu

8. Preliminary results of a bottom trawl survey around Elephant Island in October and December 1987

   determinations in Notothenia rossii were carried out by means of scales following methods and results of Freytag ... proportion of larger (= older) fish in the catches increased. Composition of the catches of C. gunnari ... Paper Title:  Preliminary results of a bottom trawl survey around Elephant Island in October and ... Chaenocephalus aceratus, Notothenia gibberifrons and N. neglecta at least since February 1985. In N. rossii the ... other shelf areas of the Peninsula region. File:  09-Kock.pdf ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 185-200 : Author(s): Kock, K.-H.

9. Areas of seabed within selected depth ranges in CCAMLR Subarea 48.3, South Georgia

   Paper Title:  Areas of seabed within selected depth ranges in CCAMLR Subarea 48.3, South Georgia ... Abstract / Description:  Areas of seabed within 50 m depth contours down to 250 m, between 250 and 500 m ... and deeper than 500 m have been estimated from nautical charts. The results are presented by CCAMLR ... . INTRODUCTION During the 1989 Meeting of the Working Group on Fish Stock Assessment in Hobart, it was agreed ... has been designated by '(S)' in the longitude (W) column of the tables. 3. RESULTS Areas of ... within selected depth ranges in the south-west Atlantic and Antarctic Peninsula regions of the Southern ... RANGES IN CCAMLR SUBAREA 48.3, SOUTH GEORGIA 1. Everson and S. Campbell* Abstract Areas of seabed ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 459–466 : Author(s): Everson, I. and S. Campbell

10. Significant intra-annual variability in krill distribution and abundance at South Georgia revealed by multiple acoustic surveys during 2000/01

    revealed no significant difference in the mean krill density derived from only those four transects ... in the midseason survey revealed no significant difference in the mean krill density derived from only those four ... obtained in the western box in the mid- season survey revealed no signifi cant difference in the mean krill ... . In order to facilitate continued time series comparisons of some individual transect means, we chose ... became 133.33 km wide with eight transects, a mean transect effort of one per 16.66 km survey box width ... ) such that the fi ve transects we were to run would also be at a mean density of one per 16.66 km. A new central ...

    Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 71–82 : Author(s): Brierley, A.S., C. Goss, S.A. Grant, J.L. Watkins, K. Reid, M. Belchier, I. Everson, M.J. Jessop, V. Afanasyev and J. Robst