Search results
-
Krill biomass assessment in Statistical Area 48 from the RV AtlantNIRO data - Autumn 1989/90
consisting of two parts; the northern (55° to 600 S; 32° to 18°W) and southern (60° to 67°S; 20° to 18 ... was 60 miles by latitude and longitude and during the second survey it was 30 miles by latitude and 40 ... for mean weighted biomass (not including areas of high biomass density) did not exceed 30 mg/m3 in the ACC ... the years, despite intensive commercial exploitation, may indicate a continued relative stability ... Paper Title: Krill biomass assessment in Statistical Area 48 from the RV AtlantNIRO data- Autumn ... in the South Sandwich and South Orkney Islands areas during a cruise by RV AtlantNIRO in March/April ... 1990. The survey was conducted in the upper 100 m layer using a modified Isaacs-Kidd trawl. Trawling ... Islands was assessed at 3.8 million tonnes, most of which was concentrated in the waters of the Weddell ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 115–121 : Author(s): Fedotov, A.C.
-
An alternative method for estimating the level of illegal fishing using simulated scaling methods on detected effort
the year all vessels in the area which could have detected the illegal activity. This can be illu ... every 30 days and lasting for 16 days. All dates are given in number of days from some arbitrary ... . Vessel Starting date Ending date One 30 44 Two 60 74 Three 90 104 Four 120 134 Five 150 164 Six ... and the number of detections. The ranges in the ‘New method’ column covers the cases of 1 to 20 detections. When ... performs better in the case of zero detections and can potentially better handle the evasion of detection ... method used directly affects the system. This is the prevention/detection problem, in which the greater ... fishing (in the simulation datasets) for a given estimated level of fishing is very large. This range of ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 143–161 : Author(s): Ball, I
-
Assessments of the stocks of Notothenia rossii marmorata and Champsocephalus gunnari in the South Georgia area
marmorata M Champsocephalus qunnari B paHOHe IOJKHOH feOpI'MH C Hcno~ h30BaHHeM AaHHhrx CCCP no npo6aM ... Working Group meeting, this paper presents some refinements on the previous year's analyses. Although ... rate to the stock in each year implied by the age data. The catch at age data themselves do ... to underestimation of the strength of year classes recruited before the start of the fishery compared to later ... in the South Georgia area Abstract / Description: The stocks of Notothenia rossii marmorata and ... Champsocephalus gunnari in the South Georgia area are assessed using USSR age sample data and recent biomass ... estimates from surveys by the FRG. These data indicate that the stock of N. rossii in 1985 was about 2.5% of ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 1-21 : Author(s): Cooke, J.G.
-
Otolith and body size relationships in the mackerel icefish (Champsocephalus gunnari)
regression model allowing for parallel lines for each year (F4.846 = 30.57, p < 0.001); including extra ... , designated by the year in which the samples were obtained, for the research surveys were: 6 to 26 January ... data, and analyses of covariance were used to assess variability in model fits between years. Note ... to all years (1.79 to 3.75 mm) showed that the loglo-transformed data were best described by a linear ... Paper Title: Otolith and body size relationships in the mackerel icefish (Champsocephalus gunnari ...
Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 117–123 : Author(s): Everson, I., B. Bendall and A. Murray
-
Distribution and abundance of Macrourus carinatus on BANZARE Bank in the southern Indian Ocean
of the family Macrouridae (rat tails and grenadiers) have become common by-catch species in recent years due ... was between 670 and 1 540 m. The average tow speed was 3 knots and standard haul duration was 30 minutes ... Ocean Basin Projection: Lambert Conic Conformal Scale 1 : 20 000 000 Standard Parallels: 52-33 ... and weight of females. Vopr. Ikhtiol., 20: 954-956. MacPherson, E. 1979. Ecological overlap between ... Paper Title: Distribution and abundance of Macrourus carinatus on BANZARE Bank in the southern ... of Macrourus carinatus on BANZARE Bank in the southern Indian Ocean (Divisions 58.4.1 and 58.4.3 ... ) based on results from a trawl survey in 1999. This is the first quantitative assessment of M. carinatus ... in this region. M. carinatus was the most common species caught in each haul, comprising on average ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 171–178 : Author(s): van Wijk, E.M., A.J. Constable, R. Williams and T. Lamb
-
Seabird by-catch by autoline vessels: do line setters increase the sink rate of integrated weight longlines?
every second. The TDRs were attached to the longline on 30 cm long snoods made from 9 mm rope ... of the TDRs. Sink times from the surface were evaluated to five target depths: 2, 3, 5, 10 and 20 ... (m) 0–2 0–3 0–5 0–10 0–20 With 7.9 12.1 20.4 38.6 76.9 Without 7.4 12.9 20.7 38.6 76.7 Robertson et al. 112 ... with Løkkeborg (2000) who found that UW longlines set with a line setter in the Norwegian longline fishery did ... m –1 lead core) longlines by some autoline vessels in the Kerguelen and Crozet Islands Patagonian ... . A trial was conducted in the Ross Sea to determine the effectiveness of line setters in increasing ... were identical, including in the first few metres of the water column where seabird interactions are ... depth of longlines for given distances astern. This increase in depth is minor and unlikely to result in ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 107–114 : Author(s): Robertson, G., J. Williamson, M. McNeill, S.G. Candy and N. Smith
-
Catch-at-age analysis applied to new fisheries: the case of Dissostichus eleginoides
); and • fishing mortality is separable by age (Doubleday, 1976). Catch-at-age for all recruited year classes ... survey duration (in years) R = recruitment t r = age at recruitment t m = terminal age L\ = time ... between the beginning of the year and the beginning of the research survey ... available for two years (1991 and 1992), which could be analysed independently, extending the evaluation ... Abstract / Description: Traditionally, the approach used in the assessment of new fisheries has been based ... resource by coarse methods. The main aim of such surveys is to monitor fishing operations in order to ... develop a comprehensive sampling design which will provide data in line with assessment procedures that ... are quite similar to those commonly used in the statistical sampling theory. These procedures are, to ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 3–9 : Author(s): Zuleta, A.V. and C.A. Moreno
-
Results of the CCAMLR Antarctic fish otoliths/scales/bones exchange system
12.0 deviation = 1 year (%) 2 60.0 X 26.2 25.6 7.0 3 54.2 47.6 X 16.7 6.0 4 71.2 50.0 55.3 X 20 ... experienced readers existed in 20.8% of all samples. Allowing for one year of deviation, agreement increased ... /08/85 39.1 29 23/08/85 37.0 30 08/09/85 37.6 31 20/09/85 38.0 32 20/11/85 38.0 33 25/12/85 43.0 ... M - 5 5? 7 4 29 15.5 32.0 F - 5 5 5 3 30 14.5 24.0 M - 5 - - - 31 20.5 89.0 F - 9 7 8 7 32 14.5 26.0 ... same species among different laboratories. Four species were included in the exchange: Notothenia ... agreement in age determination was highest for scales of juvenile N. rossii and for otoliths of juvenile C ... . antarcticum. Agreement between otoliths and scales of individual N. gibberifrons was in the order of 50 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 197–226 : Author(s): Kock, K.-H.
-
Differentiation of independent populations of Antarctic krill
- DIFFERENTIATION OF INDEPENDENT POPULATIONS OF THE ANTARCTIC KRILL In recent years, several countries (Poland ... and in the waters of the coastal current between the zero meridian and 30 o E. The larvae hatched in the Weddell ... of krill stock in each of the sUbpopulations and study of its year-to-year and seasonal fluctuations ... zooplankton Euphausia superba. Limnology and Oceanography, vol. 20, N 4, p. 635-640. Beklemishev K.V. 1969 ... : Several countries have recently shown an interest in commercial krill fishing. An understanding of krill ... of recent studies in genetic and morphophysiological variability of krill and Antarctic water ... . superba in the Southern Ocean subdivided into several independent sub-populations. The number of these sub ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 275-281 : Author(s): USSR
-
A risk-management framework for avoiding significant adverse impacts of bottom fishing gear on Vulnerable Marine Ecosystems
. (2008) and implemented each year since 1997 by the ad hoc Working Group on Incidental Mortality ... species. 5–25 Months–one year 3 Major Measurable effects on ecosystem structure or function. Large ... changes in abundance of many species and/or some extirpations. 25–50 One–few years 4 Severe ... Substantial loss to structure or function of ecosystem. Many species extirpated. 50–90 Years–decades ... measure in 2007 to ensure that significant adverse impacts of bottom fishing gear on Vulnerable Marine ... fine-scale rectangles (0.5° latitude by 1.0° longitude) or smaller can be used in the first instance ... . Temporal scales must be matched to the recovery scale of VMEs, which are probably in the order of many ... scientific research and data collection plans are in place and that risk mitigation measures are successful ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 177–193 : Author(s): Martin-Smith, K