Search results

1. Catch per unit effort and proportional recruitment indices from Japanese krill fishery data in Subarea 48.1

   Total effort (x109in3) 1985/86 7 2538-3608 244-1225 13, 15 1316 1.66 1993/94 3 2903-4991 ... 2+ components (proportion, mean size and standard deviation) are summarised in Table 2. These components ... al., 1988). Since the CPUE and Proportional Krill Recruitment Indices Table 2: Proportion, mean ... . Livingston Island Area Proportion Mean SD 0.336 37.3 6.3 0.000 0.462 42.5 5.8 0.585 42.6 5.7 0.156 ... period. The use of different fishing strategies in response to a demand for higher product quality and a ... . CPUE (catch/towing volume) in the Livingston Island area showed a decreasing trend during the study ... general decrease in krill density in the study area were considered as possible reasons for this. On the ... other hand, CPUE in the Elephant Island area showed greater interannual variation without any trend ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 47–63 : Author(s): Kawaguchi, S., T. Ichii and M. Naganobu

2. Determination of Antarctic krill acoustic back-scattering cross-section

   signal from one specimen resolved by the hydroacoustic instrument. By calculating the mean level ... of the directivity diagramme of the antenna and the mean level of the standardized echo signal, it is possible ... signal from one specimen resolved by the hydroacoustic instrument. By calculating the mean level ... of the directivity diagramme of the antenna and the mean level of the standardized echo signal, it is possible ... signal from one specimen resolved by the hydroacoustic instrument. By calculating the mean level ... of the directivity diagramme of the antenna and the mean level of the standardized echo signal, it is possible ... , it is necessary to know the mean acoustical cross-section of back-scattering from an individual object CGJ ... -4 - G ·ao (3) mean acoustic back-scattering section for the given concentration mean level ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 141-152 : Author(s): Protaschuk, V.A. and T.A. Lukashova

3. Beyond MSY: a consideration of definitions of management objectives

   , if the mean value of R/S changes appreciably with stock size, be somewhat - 311 - conservative ... is contained in the Convention for the Conservation of Antarctic Marine Living Resources. This gives ... a maximum, but this will rarely be the point corresponding to MSY or GNAI.The difference is most easily ... in determining the underlying relation between mean~recruitment and adult stock are well known. In addition ... different guidelines under more realistic population models, taking account of the objectives set out in ... / Description:  The concept of ‘Maximum Sustainable Yield’ (MSY) has provided a useful guideline for resource ... management under the assumptions of a simple population model and simple objectives. This paper explores ... Article II of the CCAMLR Convention. The criteria will depend on whether the main concern is with ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 299-322 : Author(s): Gulland, J.A.

4. The Kerguelen database

   . Conservation measures established for this species have been in force for several years. In recent years ... . A decrease of the mean length is obvious. The actual mean length is less than the length at first maturity ... IIlITlALE IIIU/"~ lu= 313~3 nAl!.FINALE j1/12/R~ 11= 3107. LIHI1ES ET ~AILLAGE OF·LA ZONE 5fLECTJO~NEE ... and biological data for the Kerguelen EEZ has been operating in France since 1979. At the end of the ... representation of these data is presented for several parameters including a distribution of the fishing effort ... , Notothenia squamifrons, N. rossii and Dissostichus eleginoides) represent about 99% of the total catches ... . Length frequency distributions of the species are also provided for the period 1979/80–1985/86. File:  02 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 23-54 : Author(s): Duhamel, G.

5. Results of fish stock assessment survey, South Georgia, December 1987 - January 1988

   ). The Commission for the Conservation of Antarctic Marine Living Resources has adopted a set of measures aimed ... of the catch was from stratum 2 (15/31/1 *)(Table 1). The stratified mean catch per tow was 27.7 kg ... and the population was estimated to be 15086 mT at South Georgia. At Shag rocks the mean catch per tow was 18.2 kg ... 1). The stratified mean catch per tow was 20.9 kg and the population was estimated to be 11412 mT. This estimate ... complements earlier surveys in the same area and showed that most of the stocks are continuing to decline ... Paper Title:  Results of fish stock assessment survey, South Georgia, December 1987- January 1988 ... Abstract / Description:  Commercial fish stocks around South Georgia have been declining since the early ... . Notothenia rossii is showing no signs of recovery and Champsocephalus gunnari is likely to continue declining ...

   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

6. A hybrid approach to acoustic classification and length estimation of krill

   components are the mean ratios of the volume backscattering coefficients, measured at two different ... components are the mean ratios of the volume backscattering coefficients, measured at two different ... are the mean ratios of the volume backscattering coeffi cients, measured at two different frequencies ... (Δfj / fi ) of mean volume backscattering coeffi cients measured at two different frequencies (fj, fi ... /c) j if f is the geometric mean of the acoustic wave number (c = speed of sound in m/s; fj , fi = selected frequencies ... %, for a given dΔ. The mean length (L) of a euphausiid with equivalent radius (afj / fi ) can be estimated ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 33–58 : Author(s): Azzali, M., I. Leonori and G. Lanciani

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

   interactiva para esta pesquerfa. 1. INTRODUCTION The need to establish conservation measures ... of the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR, 1991). The Commission has ... of the Convention Area as well as the establishment of conservation measures to ensure that sufficient k:rill ... to be affected by krill harvesting. The Commission then can formulate or alter conservation measures based ... attributable to loss of prey through fishing activities. The principal fishery in the CCAMLR Convention Area is ... the krill fishery and this paper examines ways in which the information being obtained from the ... / Description:  The CCAMLR Ecosystem Monitoring Program has been developing a technique which might detect short ... -term declines in land-based predator performance (e.g., reproductive performance) that may be ...

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

8. Trawl selectivity for Champsocephalus gunnari

   selectivity for mackerel icefish (Champsocephalus gunnari L.), were collected in 1981 in the South Georgia ... area. The trawl bags tested were made of net webbing with 3.1 mm twine and 88.2 mm mesh size. Trawling ... speed was 3.5 knots. Icefish comprised 90 to 100% of catches. The logistic selectivity curves were ... calculated using the collected data. It was found that the selectivity factor for 88.2 mm mesh size was 2.81 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 69–75 : Author(s): Efanov, S.F., G.E. Bidenko and V.A. Boronin

9. Estimating confidence intervals for fish stock abundance estimates from trawl surveys

   for estimates of abundance obtained from trawl surveys conducted by means of the swept area method, using ... obtained from trawl surveys conducted by means of the swept area method, using likelihood ratios from ... by means of the swept area method, using likelihood ratios from Aitchison's delta distribution. Simulation ... unbiased estimate of the mean density is: where and s2 are the sample mean and sample variance ... and: m- l G,(t)= l+----t m Pennington (1983) gives the following unbiased estimator for the variance of the mean density: The usual ... sample statistics for the mean and variance are not minimum variance estimators for this distribution ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 203–207 : Author(s): de la Mare, W.K

10. 1989/90 stock status and TAC assessment for Champsocephalus gunnari in Subarea 48.3 (South Georgia)

    gunnari in South Georgia Subarea (48.3) has been made using the biostatistic material for 1982/83 to 1987 ... ) using standardized fishing effort. For the beginning of the 1989/90 fishing season, the stock was ... Paper Title:  1989/90 stock status and TAC assessment for Champsocephalus gunnari in Subarea 48.3 ... (South Georgia) Abstract / Description:  The 1989/90 stock status and TAC assessment for Champsocephalus ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 15–27 : Author(s): Frolkina, Zh.A. and P. Gasyukov

Pages