Результаты поиска

1. Composition and characteristics of ichthyofauna in pelagic waters of South Georgia (Subarea 48.3)

   (Subarea 48.3) Abstract / Description:  This paper presents the results of randomly stratified pelagic ... studying the vertical migrations of some of the most abundant species were carried out during the six ... pelagic surveys. Horizontal distribution and length composition of fish, as well as the comparative ... distribution of krill and juvenile Champsocephalus gunnari were studied. The pelagic component of the ... hours virtually no juvenile fish were pelagic hauls. Most fish were in the range of caught in pelagic ... various depths during the day and at night: A - BMRT Gizhiga (No. 1: 6-7 June 1986; No. 2: 24-26 June ... ) 5 Dmitry Donskoy St. Kaliningrad 236000, Russia Abstract This paper presents the results of ... sampling stations aimed at studying the vertical migrations of some of the most abundant species were ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 125–164 : Автор(ы): Frolkina, G.A., M.P. Konstantinova and I.A Trunov

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

   / 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 ... different guidelines under more realistic population models, taking account of the objectives set out in ... Article II of the CCAMLR Convention. The criteria will depend on whether the main concern is with ... , because there is no longer a simple one to one relation between the amount of fishing and population ... particular objectives. The general uncertainties surrounding the other Antarctic stocks are certainly no ... decision tree. 1. Is the spawning stock below the safety level? Yes; close the fishery. No; go to 2 ... . 2. Is the value of F in the next season likely to reach the target F if no measures are applied ...

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

3. Note on estimating krill abundance from acoustic data on individual aggregations

   Abstract / Description:  The fundamental equations and assumptions underlying estimation of krill abundance ... using echo-integration information and aggregation parameters are briefly described. The chief ... differences of the two approaches are highlighted. It is concluded that the echo-integration approach is ... superior for the estimation of regional krill abundance and its variance since it is easier to apply ... ) involves the handling of much smaller volumes of data; (c) requires no assumptions regarding aggregation ... ACOUSTIC DATA ON INDIVIDUAL AGGREGATIONS I. Hampton and D.G.M. Miller* Abstract The fundamental ... aggregation parameters are briefly described. The chief differences of the two approaches are highlighted ... . It is concluded that the echo-integration approach is superior for the estimation of regional kriU ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 219–223 : Автор(ы): Hampton, I. and D.G.M. Miller

4. Seal mitigation measures on trawl vessels fishing for krill in CCAMLR Subarea 48.3

   Abstract / Description:  At the 2004 meeting of the Working Group on Ecosystem Monitoring and Management ... (WG-EMM) in Siena, Italy, the UK reported on the by-catch of fur seals (Arctocephalus gazella) in the ... avoid fur seal deaths in the fishery. WG-EMM requested that the UK provide further details of the ... methods employed for consideration by the ad hoc Working Group on Incidental Mortality Arising from ... net rather than the roof. After this modifi cation, no further captures were reported. The vessel ... allow the seals to escape alive and unharmed. Therefore no further measures were developed ... those on the Esperanza, in that no specifi c mitigation measures were deployed. However, the front ... the nets used on the Koyo Maru No. 8 (Figure 8). The NISSUI system was developed by Nippon Suisan ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 195–205 : Автор(ы): Hooper, J., J.M. Clark, C. Charman and D. Agnew

5. Fishing for toothfish using pots: results of trials undertaken around South Georgia, March–May 2000

   , March–May 2000 Abstract / Description:  During the period March to May 2000, the UK undertook trials of ... (Subarea 48.3). This method has the potential to minimise, or eliminate, incidental bird mortality when ... compared to the standard longline method. This paper describes the trial and the results, and discusses the ... commercial viability of this fishing method for toothfish fisheries in the CCAMLR Convention Area. While the ... entangled in the fishing gear was also very low; no bird mortalities were witnessed during the trial. Due ... , no birds were observed in the direct vicinity of sinking pots. This may result from tlie fact that ... observed in the vicinity of tlie vessel, but showed no interest in hauling operations. The fourth aim of ... , which may have affected their condition. No crabs had vitality stage 3 after the experiment; all ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 93–105 : Автор(ы): Agnew, D.J., T.M. Daw, G.M. Pilling and M.G. Purves

6. Preliminary model of krill fishery behaviour in Subarea 48.1

   :  A simple model of the behaviour of the krill fishery in FAO Statistical Subarea 48.1 (South Shetland ... Islands and Antarctic Peninsula) is described. Parameters of the model are calculated from Chilean fishery ... data over the period 1989 to 1992. The distribution of catches predicted by the model, which is ... restricted to the four months December to March, compares favourably with the historical distribution of ... effectively unlimited compared to the size of the catch and thus there was no limit to catch in any fine ... simple model of the behaviour of the krill fishery in FAO Statistical Subarea 48.1 (South Shetland ... Islands and Antarctic Peninsula) is described. Parameters of the model are calculated from Chilean ... fishery data over the period 1989 to 1992. The distribution of catches predicted by the model, which is ...

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

7. Protecting young fish and spawning aggregations of Champsocephalus gunnari in Subarea 48.3 (South Georgia): a review

   Subarea 48.3 (South Georgia): a review Abstract / Description:  The need to protect young fish and ... spawning aggregations in fisheries generally, and specifically in the Champsocephalus gunnari fishery in ... Subarea 48.3, is reviewed. Mechanisms available to achieve these objectives are discussed, including the ... measures put in place by CCAMLR to date. These measures are re-examined in the light of new information ... approximately with the start of the spawning season, and there is no evidence of a time of year when a closed ... , b u t the Commit tee w a s no t i n a position at its 1999 meet ing t o provide unequivocal ... . gzuznnri benefit in restoring depleted stocks through the protection of juvenile fish. There was no ... Conservation Measure 1/III had no fixed lifespan, it has not been in force since the 1989/90 season (see ...

   Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 75–86 : Автор(ы): Parkes, G.B

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

   instruments Abstract / Description:  The limited capabilities of existing hydroacoustic instruments in ... in areas surveyed. The task of detecting surface concentrations of krill can be solved with the help ... of towed acoustic antennae. The practical possibility of detecting dispersed krill by hydroacoustic ... instruments was established on board the research vessel Odissey during the international expedition under the ... condition ensures reliable reception and registration by the recorder and integrator of no less than one ... ESTIMATION OF KRILL CONCENTRATIONS BY HYDROACOUSTIC INSTRUMENTS K.I. Yudanov (U.S.S.R.) Abstract The ... concentrations of krill lead to considerable underestimates of krill biomass in areas surveyed. The task of ... detecting surface concentrations of krill can be solved with the help of towed acoustic antennae. The ...

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

9. Midwater trawl catchability as an aspect of a quantitative assessment of krill biomass conducted using a trawl census survey

   variable which depends on both the behavioural and distributional characteristics of the target species and ... midwater trawls and small research trawls, in this case using an Isaacs-Kidd trawl, demonstrated the ... futility of using the latter for trawl census survey biomass assessments due to their highly variable ... catchability over the survey area and also because the biomass estimates thus obtained were characterised by ... contains no errors, the relative error in the biomass estimate from formulas 1 and 2 will be calculated as ... catchability no less than ~ x(P) = 0.1, it would be necessary to carry out over the study area 20 hauls with a ... . Kasatkina* Abstract Midwater trawl catchability is a variable which depends on both the behavioural and ... distributional characteristics of the target species and trawl parameters. Reliability of biomass assessments ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 257–272 : Автор(ы): Kasatkina, S.M.

10. Target strengths of krill at 136 and 20 kHz

    . Ensonification of encaged live krill. For aggregations with mean lengths from 45 to 50 mm the mean single-krill ... the mean single-krill target strengths range from-71 to-77 dB at 20 kHz. Trawl hydroacoustic method ... . For aggregations with mean lengths from 47 to 50 mm the mean target strengths ranged from-71 to-75 dB ... . At the same frequency for aggregations with mean lengths in the range 41 to 47 mm the mean single ... in order to guarantee that the cage had become completely saturated and that there was no air ... . 1985. Report of the Post-FIBEX Workshop in August 1984. BIOMASS Report Series No. 40. ANON. 1986 ... No.ofKriU TS (cage + krlll), Krill Krill Parameters No. in the Cage dB TS,dB L (mm) sd P 1 100 -45.99 ... aggregations with mean lengths from 45 to 50 mm the mean single-kriU target strengths range from -68 to -69 dB ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 141–157 : Автор(ы): Kasatkina, S.M.

Страницы