Résultats de la recherche

1. Biological parameters for icefish (Chionobathyscus dewitti) in the Ross Sea, Antarctica

   consistent with previous research. Regression equations for converting standard length to total length and ... . Gonad maturity stage data showed that most fish were either immature or resting (mature). Gonadosomatic ... the data. Length-at-maturity and age-at-maturity ogives indicated that 50% of the fish sampled were ... mature at about 340–360 mm total length (TL) and about 3–4 years of age, and that 95% were mature at ... et al. (2006). CCAMLR has recommended that a number of research activities be undertaken by Member ... proved to be unnecessary due to the high pro- portion of fish with empty stomachs. The GSI was plotted ... of this model and the corresponding model with the same error structure (that did not assume ... colour with those produced by C. dewitti. It is possible that they may have been accidentally ingested ...

   Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 139–165 : Auteur(s): Sutton, C.P., M.J. Manning, D.W. Stevens and P.M. Marriott

2. Revised age and growth estimates for Antarctic starry skate (Amblyraja georgiana) from the Ross Sea

   been generated that suggest much slower growth, greater ages-at-maturity (about 20 years compared with ... georgiana in the Ross Sea suggested that these skates initially grow very rapidly for about five years ... and growth in A. georgiana that is radically different from the published interpretation is presented ... 6–11 years) and greater maximum ages (28–37 years compared with 14 years). Several pieces of ... was 37 years compared with 28 years by reader 2. Reader 2’s ages increased for all eight skates that ... . Validation or verification techniques that have some promise include injec- tion with fluorochemical markers ... ): is there an upper limit to ages that can be determined from shark vertebrae? Mar. Freshw. Res., 58 ... georgiana in the Ross Sea suggested that these skates initially grow very rapidly for about five years ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 211–220 : Auteur(s): Francis, M.P. and M.J. Gallagher

3. Sexing of adult Adélie penguins by discriminant analysis of morphometric measurements

   been determined earlier by means of observing the birds' breeding behaviour (first incubation ... shift). It was found that the combination of flipper breadth, bill depth and length of the middle toe ... incubation shift). It was found that the combination of flipper breadth, bill depth and length of the middle ... are very useful but during the breeding season they can be applied only after egg-laying. In many ... studies it would be necessary to know the sex of penguins on their arrival at the breeding colony. A ... "Standard of Birds' Measurements" proposed by Baldwin et al. (1931) with some modifications suggested by ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 543–549 : Auteur(s): Scolaro, J.A., Z.B. Stanganelli, H. Gallelli and D.F. Vergani

4. Some thoughts on precautionary measures for the krill fishery

   the potential yield model developed by the CCAMLR Scientific Committee's Working Group on Krill ... (WG-Krill) is discussed and it is concluded that such a method is appropriate in setting an overall ... predators. A major difficulty with this approach is that CCAMLR subareas, such as 48.3, are known to be ... estimator of B when P, T and M are replaced with estimated values. The bias can be approximately corrected ... measures for a harvested resource is to ensure that harvesting is conducted at a level which can be ... . However, a fishery could be allowed to exist only if there is enough information to ensure that the ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 1–11 : Auteur(s): Everson, I. and W.K. de la Mare

5. CCAMLR ecosystem monitoring and a feedback management procedure for krill

   -term declines in land-based predator performance (e.g., reproductive performance) that may be ... Ecosystem Monitoring Program might be incorporated into a feedback management strategy for this fishery ... performance (e.g., reproductive performance) that may be attributable to loss of prey through fishing ... -based predator performance (e.g., reproductive performance) that may be attributable to loss of prey ... . This paper examines some of the issues that need to be addressed by the Scientific Committee in ... the ecosystem needs to be one that minimises errors in interpretation and action by the Commission ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 345–350 : Auteur(s): Constable, A.J.

6. Surface water circulation in krill fishing areas near the South Shetland Islands

   Abstract / Description:  This paper describes tracks followed by six surface drifting buoys that were ... with a drogue attached at a depth of 30 m to assess flow patterns at the depth range where krill tended ... to be most abundant. The buoys were tracked using the ARGOS satellite positioning system. Based on ... sluggish southwest current with a series of small-scale circular and semi-circular flows in the shelf ... offshore waters appear to be associated with these currents. Sprong and Schalk (1992) reported that krill ... regions. It was also emphasised that analyses of data to determine regions of rapid water transport with ... region moved north-east with a meandering current (Figures l(a) and l(c)) that travelled generally ... oceanic region between these island groups were found to be in association with the currents revealed by ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 125–136 : Auteur(s): Ichii, T. and M. Naganobu

7. By-catch, growth and feeding of Antarctic juvenile fish taken in krill (Euphausia superba Dana) fisheries in the South Georgia area, in 1992

   93 mm in late July. The mean growth rate of this species over this period is estimated to be 0.37 mm ... mm. The mean daily length increase in N. larseni is estimated to be 0.08 mm. The diet, by mass, of ... area from May to August 1992, the total removals of C. gunnari and N. larseni resulting from by-catches ... are estimated to be 34.3 ±  8.0 and 19.8 ±  3.7 million individuals, respectively. File:  09pakhomov ... may be associated with higher abundances of juvenile fish found off the LONGITUDE (W) Figure 1 ... during the investigation. The data presented in Figure 6 suggest that there may be a tendency for the ... (1992) that the problem of the by-catch of juvenile fish could be reduced by shifting krill fishing to ... total by-catch of juvenile fish may be smaller than the statistical error associated with the ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 129–142 : Auteur(s): Pakhomov, E.A. and S.A. Pankratov

8. Bias in the estimation of krill yield from using a deterministic formulation of the median unexploited spawning biomass

   yield model and the generalised yield model (GYM), are currently available to CCAMLR that can be used ... biomass is known prior to a projection so that in each trial a direct assessment can be made of (i ... needs to be estimated prior to each trial in order for it to be based on the parameters for that trial ... for estimating yields according to decision rules that relate spawning stock status to the median ... variability will mean that this will not be achieved but it should be very closely approximated with a very ... generalised yield model (GYM), are currently available to CCAMLR that can be used for estimating yields ... projection so that in each trial a direct assessment can be made of (i) whether the stock became critically ... be based on the parameters for that trial. The krill yield model uses a biased estimate of the ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 1–8 : Auteur(s): Constable, A.J. and W.K. de la Mare

9. Detection and quantitative estimation of krill concentrations by hydroacoustic instruments

   in areas surveyed. The task of detecting surface concentrations of krill can be solved with the help ... FIBEX program. It was shown that the hydroacoustic device Simrad SK-120, with TVG switched off, is ... theoretical calculations, the range of detection of individual specimens can be considerably increased at the ... detecting surface concentrations of krill can be solved with the help of towed acoustic antennae. The ... shown that the hydroacoustic device Simrad SK-120, with TVG switched off, is capable of registering ... is very likely that the frequency dependence of krill is similar. However, in order to be sure of ... difficult to detect with the existing hydroacoustic instruments and although such concentrations can be ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 123-139 : Auteur(s): Yudanov, K.I.

10. Growth and age/length structure of populations of Notothenia (Lepidonotothen) squamifrons (Nototheniidae) in various areas of the Indian sector of the Southern Ocean

    paper. It was found that during the first years of life the linear growth rate is 3 to 5 cm per year. It ... earlier by Duhamel (1981), however it should be noted that Duhamel used total length (L) for calculating ... Kerguelen Island area (155 to 188 g/year). It must be noted that retardation of the weight growth rate on ... (Table 2). 126 When comparing the data obtained it can be seen that while the growth rate for all ... each of the areas studied over different years and to note changes that may be occurring. N ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 123–139 : Auteur(s): Zaitsev, A.K.

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