WG-KRILL-91/01 Rev. 1
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Agenda
CCAMLR Secretariat
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WG-KRILL-91/02
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List of participants
CCAMLR Secretariat
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WG-KRILL-91/03
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List of documents
CCAMLR Secretariat
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WG-KRILL-91/04
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The Anthropogenic evolution of Antarctica’s pelagic communities
Voronina, N.M.
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WG-KRILL-91/05
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On the consequences of large-scale harvesting of mesopelagic fish and Antarctic krill
Kashkin, N.I.
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WG-KRILL-91/06
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Resolution of the all-union symposium “Ecosystems of the Pelagic Waters of the Southern Ocean”
Delegation of the USSR
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WG-KRILL-91/07
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Characteristics of krill swarms from Prydz Bay
D.J. Agnew (Secretariat) and I.R. Higginbottom (Australia)
Resumen:
The CCAMLR.AUS dataset available to the Subgroup on Survey Design was derived from a survey of Prydz Bay, Antarctica, in December 1990. Swarm length, depth, thickness, MVBS and interswarm length was calculated for swarms of euphausids encountered along a 78 km transect over the continental shelf close to the CEMP study site at Magnetic Island. The euphausid species was probably Euphausia Read More
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/08
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Definition of the problem of estimating fish abundance over an area from acoustic line-transect measurements of density
Foote, K.G. and G. Stefánsson
Resumen:
The problem of acoustic abundance estimation is briefly reviewed. Under proper conditions, fish density can be measured with high accuracy along line transects. Observed variations in fish density consequently reflect biological variations, or inhomogeneity in spatial distribution. The particular problem of estimating fish abundance over an area from line-transect measurements of fish density Read More
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Admin Admin (Secretaría de la CCRVMA)
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/09
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Fine-scale catches of krill in Area 48 reported to CCAMLR 1988 to 1990
CCAMLR Secretariat
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WG-KRILL-91/10
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On construction of complex and stock assessment surveys as well as on collection of material on Euphausia superba and environmental conditions in the fishing areas and adjacent waters
Makarov, R.R. and V.V. Maslennikov
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WG-KRILL-91/11
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Peculiarities of Euphausia superba size composition in Statistical Subarea 48.2 (South Orkney Islands)
Latogursky, V.I. and R.R. Makarov
Resumen:
Clarification of main tendencies of spatial changeability of size composition of E.superba was undertaken by means of comparision of various size groups of curstacean distribution in the region of the South Orkney islands and adjacent waters. Materials of 14 separte expeditions were used (Table 1), which cover 20-years period (from 1965 to 1985). Data on size composition of E.superba for each Read More
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Admin Admin (Secretaría de la CCRVMA)
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/12
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Report of the biologist-observer from the commercial trawler Grigory Kovtun, season 1989/90
Vagin, A.V.
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WG-KRILL-91/13
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Target strength of Antarctic krill
Hewitt, R.P. and D.A. Demer
Resumen:
In-situ measurements of individual krill target strength are presented (modal value = -69db). Net samples obtained immediately before the experiment indicate that the animals were reproductively mature and averaged 47.44mm in length. Results agree well with recent predictions of acoustic target strength based on extrapolations of other field experiments using the bent cylinder model of sound Read More
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Admin Admin (Secretaría de la CCRVMA)
Aprobado por:
Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/14
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Oceanic condition and zooplankton distribution/ abundance in Bransfield Strait during austral summer 1989/1990
Kim, S. and M.S. Suk
Resumen:
To delineate zooplankton distribution and abundance in Bransfield Strait, in relation to hydrographic condition, a total of 29 sampling stations was occupied for the CTD casts and plankton towings in a systematic grid from December 29, 1989 to January 7, 1990. Comparisons of temperature and salinity distributions and T-S diagrams suggest that the cold and saline Weddell Sea water entered from Read More
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Admin Admin (Secretaría de la CCRVMA)
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/15
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Estimation of krill (Euphausia superba) mortality and production rate in the Antarctic peninsula region
Siegel, V.
Resumen:
A net sampling survey for krill was carried out by RV ‘Meteor’ along the Antarctic Peninsula from 26 December 1989 to 14 January 1990. Results were compared with data of an identical survey with RV ‘Polarstern’ in 1987/88. Seasonal variation between summer and winter abundance/biomass data exceeded a factor of 35 times, while interannual variability between available surveys reached only a Read More
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Admin Admin (Secretaría de la CCRVMA)
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/16
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Estimation of distribution characteristics of the fishing objects from shoal linear cross sections (methodical directions)
Kadilnikov, Y.V.
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WG-KRILL-91/17
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Automated data collection and processing system relevant to fishing object distribution
Kadilnikov, Yu.V., O.M. Khandros and Yu.A. Starovoyt
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WG-KRILL-91/18
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Brief program and methods of investigations on krill damage by midwater trawl sections
Zimarev, Yu.V.
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WG-KRILL-91/19
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Small scale krill surveys: simulations based on observed euphausiid distributions
D.J. Agnew (Secretariat) and S. Nicol (Australia)
Resumen:
An observed distribution of Meganyctiphanes norvegica aggregations is used to examine the effects of krill swarm orientation and shape on the success of two proposed survey designs. The simulation involves a number of random paths of parallel or radially arranged transects passing through three distributions each of which is given 4 rotations. The results indicate that the coefficient of Read More
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/20
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Note on estimating abundance from acoustic data on individual krill aggregations
Hampton, I. and D.G.M. Miller
Resumen:
The theoretical basis underlying estimation of krill abundance using echo-integration and aggregation information 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, requires less data analysis and does not Read More
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Admin Admin (Secretaría de la CCRVMA)
Aprobado por:
Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/21
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Some comments on the procedure for testing estimators of krill abundance which utilise survey data
Butterworth, D.S., D.L. Borchers and D.G.M. Miller
Resumen:
Since krill distributional data do show evidence of spatial correlation, estimators of abundance which attempt to model such effects (such as those based on Kriging) may provide improved abundance estimates from survey data. However, computer simulation studies are first required to test whether such estimators, and alternative possible survey designs, are indeed likely to provide improved Read More
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Admin Admin (Secretaría de la CCRVMA)
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/22
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Krill (Euphausia superba) distribution in relation to water movement and phytoplankton distribution off the northern South Shetland Islands
Delegation of Japan
Resumen:
The waters in the vicinity of the South Shetland Islands and Elephant Island were surveyed to investigate mechanisms for the formation of krill concentrations and to estimate acoustic biomass of krill in the 1990/91 austral summer. Main krill concentrations occurred in the shelf waters north of the islands, as usual. Tracks of drifting buoys (with curtain drogues at 30 m depth where krill Read More
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/23
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Brief report of the sixth Antarctic survey cruise of JFA R/V Kaiyo Maru
Naganobu, M., T. Ichii and H. Ishii
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WG-KRILL-91/24
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A simple approach for calculating the potential yield of krill from biomass survey results
D.S. Butterworth (South Africa) and M. Basson (United Kingdom)
Resumen:
Estimates are calculated for the parameter λ in the yield equation Y = λ M B0 for a kri11 fishery in which both the fishery and kri11 growth are seasonal. The criterion used for the calculations is that the probability that the kri11 spawning biomass drops below 20% of its average pre-exploitation level over a 20 year period of harvesting should not exceed l0%. The value of λ depends strongly Read More
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/25
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By-catch of fish in the krill fishery
I. Everson (United Kingdom), A. Neyelov and Y. Permitin (USSR)
Resumen:
Observations are reported of icefish being taken as bycatch during krill fishing operations from a research vessel. The results indicate that the bycatch of fish in the commercial krill fishery may be significant in some areas of the South Georgia shelf. The problem is thought to be least in open ocean krill fishing.
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/26
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When will the information required for rational management of the krill fishery become available and what should CCAMLR do in the meantime?
Nicol, S. and A. Constable
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WG-KRILL-91/27
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Krill aggregation characteristics in South Orkney Island area in April 1990
Fedulov,P.P., V.V. Devicin, E.N. Timohin and N.B. Shishin
Resumen:
Physical characteristics of 437 krill aggregations detected acoustically in the area o£ S.0rkney are discribed.All swarm parameters were registered and processed automatically.The aggregations thickness and length (2.5 m and 10.4 m)were considerably smaller, then those published by. other authers. The aggregations were on average 2.2 km apart. It is shown that aggregation parameters depend in Read More
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Admin Admin (Secretaría de la CCRVMA)
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/28
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Possible approach to krill movement estimation by hydroacoustic observations
Fedulov, P.P.
Resumen:
Method of estimation of krill drift velocity in water current,using repeated acoustic transects on rectangular polygon is discribed.Dimensions of polygon and frequency of acoustic observations have to be determined with taking into account distribution patterns of krill,its patchiness, between-swarm distance (BSD) and between-clusters distance (BCD).For ocean current velocity- 20 sm/sec,ship Read More
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Admin Admin (Secretaría de la CCRVMA)
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/29
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Target strengths of krill at 136 and 20 kHz (available in Russian only)
Kasatkina, S.M.
Resumen:
Estimation of krill target strength was made by ensonification of encaged live krill and using trawling-acoustic method . Ensonification of encaged live krill. For aggregations with mean lengths in the range (45,50) mm the mean single-krill target strengths are in the range (-68, -69) dB at 136 kHz. For aggregations with mean lengths in the range (43,47)mm the mean single-krill target Read More
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Admin Admin (Secretaría de la CCRVMA)
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/30
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Analyses of acoustic line-transect data from the waters around South Georgia: estimation of krill (Euphausia superba Dana) biomass
Murphy, E., I. Everson and A. Murray
Resumen:
A large-scale acoustic survey of zooplankton stocks of the waters around South Georgia was carried out during November and December 1981. The data have been analysed as a survey using various definitions of strata. The total biomass in the area of 155 786 km2 was estimated to be 1.8225 x 106 t (Coefficient of Variation = 9.5%). This gives an estimate of mean density throughout the region of 11 Read More
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Admin Admin (Secretaría de la CCRVMA)
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/31
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Krill aggregation characteristics: spatial distribution patterns from hydroacoustic observations
Miller, D.G.M. and I. Hampton
Presentado por:
Admin Admin (Secretaría de la CCRVMA)
Aprobado por:
Admin Admin (Secretaría de la CCRVMA)
Publicación:
Miller, D.G.M. and I. Hampton. 1989. Krill aggregation characteristics: spatial distribution patterns from hydroacoustic observations. Polar Biol., 10: 125-134. https://doi.org/10.1007/BF00239157.
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WG-KRILL-91/32
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Midwater trawl catchability regarding quantitative estimation of krill biomass using the method of trawling surveys on abundance (available in Russian only)
Kasatkina, S.M.
Resumen:
Midwater trawl catchability is variable depending both on fishing object behaviour and distributional pattern end trawl parameters. Data on trawl catchability distribution parameters and krill distributional pattern in the surveyed area enable to increase reliability of the biomass estimates.
Comparative analysis for catchability of fishery midwater trawls and small research trawls, when Read More
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Admin Admin (Secretaría de la CCRVMA)
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/33
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Some statistical properties of krill acoustical data from SIBEX and ice edge zone surveys
Godlewska, M.
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WG-KRILL-91/34
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Krill distributions and their diurnal changes
Godlewska, M. and Z. Klusek
Resumen:
Krill swarms were recorded acoustically along a 2340 Nm of the ice edge between Elephant Island and South Orkney Islands. Depth distributions and migration pattern were different for the three distinguished regions. It has been sugested that physical factors are the most important in both :horizontal and vertical krill distributions.
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Admin Admin (Secretaría de la CCRVMA)
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/35
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Report of the Working Group on Krill Subgroup on Survey Design
(Yalta, USSR, 18 to 20 July 1991)
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WG-KRILL-91/36
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Preliminary results of the Polish commercial krill fishery in the Antarctic during 1990/91 season
Wójcik, I. and R. Zaporowski
Resumen:
Four Polish commercial trawlers participated in the krill fishery in 1990/91 season on the fishing grounds in statistical Sub-areas 48.2 and 48.3. In total 9 333.7 tonnes of krill were harvested. As the fishery data were not fully analysed yet no clear trends in catch-per-unit-effort for different fishing grounds during the season could be detected.
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Admin Admin (Secretaría de la CCRVMA)
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/37
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CPUEs and body length of Antarctic krill within commercial hauls of polish trawler FV Lepus in the fishing ground off South Orkneys in January and February 1991
Wójcik, I. and R. Zaporowski
Resumen:
Length composition of krill in diurnal and night hauls of FV Lepus, off S. Orkneys in January and February 1991, generally show similar pattern. The proportion of bigger individuals of krill in night hauls was slightly higher than within diurnal hauls. CPUE values in February were higher than those in January. No larval fish were recorded in krill catches. Only few specimens of Electrona Read More
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Admin Admin (Secretaría de la CCRVMA)
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/38
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Volumetric analyses of Antarctic marine ecosystem data
Sexton, S.N., J.E. Rosenberg and D.A. Demer
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WG-KRILL-91/39
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Chilean krill fishery: analysis of the 1991 season
Marín, V.H., A. Mujica and P. Eberhard
Resumen:
This paper summarized the chilean catch data for 1991. Especial emphasis is given to the analysis of haul-by-haul data and its use in understanding small scale spatial distribution of fishing grounds. The results show that the krill fishery in subarea 48.1 is particularly intense near CEMP sites. Other uses of haul-by-haul data are suggestted.
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Admin Admin (Secretaría de la CCRVMA)
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Admin Admin (Secretaría de la CCRVMA)
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WG-KRILL-91/40
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Krill target strength estimated by underwater photography and acoustics
Watkins, J.L.
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WG-KRILL-91/41
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Report on discussions on krill target strength
K.G. Foote (Norway), D. Chu and T.K. Stanton (USA)
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WG-KRILL-91/42
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A proposal for stock biomass estimate of Euphausia superba Dana by the environmental index Q200 in comparison with Hampton’s method (extended abstract)
Naganobu, M.
Presentado por:
Admin Admin (Secretaría de la CCRVMA)
Aprobado por:
Admin Admin (Secretaría de la CCRVMA)
Publicación:
Naganobu, M. 1986. A proposal for stock biomass estimate of Euphausia superba Dana by the environmental index Q200 in comparison with Hampton’s method (extended abstract). Mem. Natl Inst. Polar Res., Spec. Issue, 40: 194-196.
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WG-KRILL-91/43
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Hydrometeorological basis for forecasting biomass and some fishery indices of Antarctic krill in the Sodruzhestva Sea
V.A. Bryantsev (USSR)
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