Search results
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A fine-scale model of the overlap between penguin foraging demands and the krill fishery in the South Shetland Islands and Antarctic Peninsula
Paper Title: A fine-scale model of the overlap between penguin foraging demands and the krill ... using the total catch of krill taken within 100 km of penguin colonies in their breeding season ... (December to March) as an index of overlap between the potential foraging areas of penguins and the ... distribution of the krill fishery in Subarea 48.1 (South Shetland Islands). As this index has proven unsuitable ... distances of 11 to 24 km at bearings between 330" and 033" for chinstrap penguins, and 20 to 40 km at ... to be foraging within the minor unit at any time was determined as where P, is the total number of ... pairs in colony t of colonies (only one bird from a pair is assumed to be foraging at any one time ... unit and z is the area of the arc of angle theta which contains the M, defined as being at distances ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 99–110 : Author(s): Agnew, D.J. and G. Phegan
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On reproduction of Electrona carlsbergi (Tåning)
. 1981. Results of the research cruises ofFRV Waiter Herwig to South America. Family Myctophidae ... Paper Title: On reproduction of Electrona carlsbergi (Tåning) Abstract / Description: This paper ... presents results from histological examinations of gonads of Electrona carlsbergi from the Atlantic sector ... of the Southern Ocean. From materials available it has been ascertained that E. carlsbergi spawns in ... the notal waters. Maturation of females begins when body length reaches 76 to 78 mm. Vitellogenesis is ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 397–409 : Author(s): Mazhirina, G.P.
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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 ... 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 ... gain, including the effects of temperature, standard sphere and time, is 2.9 dB. Gain values calibrated ... with the Cu sphere are, with the exception of the long pulse length, lower than those from the WC ...
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
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An index of per capita recruitment
Paper Title: An index of per capita recruitment Abstract / Description: An index of per capita ... recruitment (PCR) is proposed such that where R 1 is the proportion of age-l animals sampled in year y and M ... is the post-recruit mortality rate. The intent of the index is to facilitate investigation of ... reproductive success and the factors postulated to affect it. The formulation of PCR is based on the ... , 1 000 values were drawn at random and PCR calculated for several levels of M. When R1 followed a ... growth. Small changes in the assumed value of M, particularly at high levels, will not greatly affect ... the value of PCR over the normal range of RI. The effect will become greater, however, at very high ... mortality (M) of krill was between 0.88 and 0.96 from catch-at-age data. Priddle et al. (1988) estimated M ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 179–196 : Author(s): Hewitt, R
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Review of length-weight relationships for Antarctic krill
Regression Coefficient Size Range Number Dominant Adult Reference a b (mm) ofKrill Maturity Stages October ... Coefficient Size Range Number Dominant Adult Reference a b (mm) ofKrill Maturity Stages Feb/Mar 0.00010 ... Size Range Number Dominant Adult Reference a b (mm) ofKrilI Maturity Stages M 0.0034 3.1761 3-61 all ... (1980). Month Regression Coefficient Size Range Number Dominant Adult Reference a b (mm) of ... Paper Title: Review of length-weight relationships for Antarctic krill Abstract / Description ... euphausiid species), are listed for ash-free dry weight, dry weight, and wet weight. The accuracy of length ... taken into account. The influence of seasonal changes on length-weight relationship parameters is ... discussed. Recommendations for possible uses of reviewed length-weight relationships are presented. File ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 145–155 : Author(s): Siegel, V.
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The choice of procedure for deciding when to close fisheries regulated by CCAMLR: a simulation model
=O.5% of T AC par day • 1% ofTAC/day O.S J:I 2"10 of TAC par day Cl C . 'c:;~ -;:f- C3 '" ~ = 0.6 ... , and show local minima which occur at different values ofL with different catch rates. 90 Tableau ... Paper Title: The choice of procedure for deciding when to close fisheries regulated by CCAMLR: a ... deciding the closure date for fisheries monitored by the Secretariat of CCAMLR, have been difficult to ... implement because of the variation in catch rates shown by the fisheries. Non-fluctuating random and ... fluctuating random catch histories are simulated and the performance of four models for making closure ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 81–97 : Author(s): Agnew, D.J.
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Results of fish stock assessment survey, South Georgia, December 1987 - January 1988
Paper Title: Results of fish stock assessment survey, South Georgia, December 1987- January 1988 ... complements earlier surveys in the same area and showed that most of the stocks are continuing to decline ... . Notothenia rossii is showing no signs of recovery and Champsocephalus gunnari is likely to continue declining ... measures aimed at rebuilding the stocks of N. rossii and maintaining the other fish resources in the ... largest tow was at station 86, yielding 428 kg. This represents 13% of the catch of this species. Most of ... form a smaller mode at about 32 cm in 1987/88. Fifty percent of the fish in the 22 - 25 cm size range ... are mature (Lso) (Kock et al. 1985). based on survey catches 44% of the population was at or below ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 19-52 : Author(s): McKenna, Jr., J.E. and S.B. Saila
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Length-based assessments revisited – why stock status and fishing mortality of long-lived species such as toothfish cannot be inferred from length-frequency data alone
Paper Title: Length-based assessments revisited – why stock status and fishing mortality of long ... / Description: In many of CCAMLR’s new and exploratory fisheries, stock assessment techniques are still in ... development. The failure of the tag-recapture program to provide robust assessments in many areas and doubts ... and fishing mortality from length-frequency data alone. In this paper, a number of length-based stock ... over two or three decades (Constable et al., 2000). At the core of this approach are rules for ... the length at first capture Lc and an esti- mate of L∞ are required. In addition to steady-state ... of weight-at-age and numbers-at-age under zero fish- ing mortality is maximised. Cope and Punt ... could theoretically be fished at a target spawning biomass of 40% relative to an unfished population ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 57–73 : Author(s): Ziegler, P.E., D.C. Welsford and A.J. Constable
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Management and uncertainty: the example of South Georgia
Paper Title: Management and uncertainty: the example of South Georgia Abstract / Description ... : Decisions on fishery management are often made with some degree of uncertainty in scientific advice. Such ... to consider ways in which CCAMLR can improve its ability to take decisions in the face of uncertainty ... . From an examination of Articles IX 2(f) and XV 2(e, d) of the CCAMLR Convention it follows that a ... the stock of Notothenia rossii is at an extremely low level. Proposals have been made in both the ... level at which they could provide sustained yields of y thousand tons per year, and that any other ... Figure 2 of the working party report it appears that mortality has increased from 0.11 to 0.76, i.e. at ... view would be to challenge the general interpretation, and look at some of the inconsistencies of ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 341-353 : Author(s): Gulland, J.A.
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Low genetic diversity and temporal stability in the Antarctic toothfish (Dissostichus mawsoni) from near-continental seas of Antarctica
(Dissostichus mawsoni) from near-continental seas of Antarctica Abstract / Description: This study presents ... data on the DNA analysis of recent (2011–2013) samplings of Antarctic toothfish (Dissostichus mawsoni ... analysis of the most informative subset of nuclear genetic markers of SNP variation presented in Kuhn and ... Gaffney (2008), do not support genetic differentiation of samples from the Ross Sea. Discrepancies in the ... late 1990s and the fleet use mainly bottom-set longlines at depths of 1 200–1 800 m. Defining the ... -water) stage occurs when fish reach 100 cm in length and migrate to deep waters and stay at a depth of ... cycle protocol: a pre- liminary denaturation of DNA at 94°C for 1 min was followed by syntheses of DNA ... products: melt- ing at 92°C for 20 sec, annealing of primers at 55°C for 40 sec, DNA syntheses at 72°C for ...
Science Journal Paper : CCAMLR Science, Volume 21 (CCAMLR Science, Volume 21) : 1–9 : Author(s): Mugue, N.S., A.F. Petrov, D.A. Zelenina, I.I. Gordeev and A.A. Sergeev