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Number of results: 6
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Abstract

The material obtained between 1977 and 1979 has allowed to compare body length, age and sex of South Georgia fish caught in the region of South Georgia Island. The growth rate of body length and weight of individuals have been determined. According to results the South Georgia icefish at the time of investigations did not form a homogenous, stable stock in the region of South Georgia Island.

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Authors and Affiliations

Mirosław Mucha
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Abstract

In material collected from birds (Aves, Procellariiformes) in the South Georgia region by Polish Antarctic Marine Research Expedition in 1976 the following mallophagan species were found: Docophoroides brevis (Duf.), Naubates fuliginosus (Tasch.), Pseudonirmus gurlti (Tasch.) and Trabeculus hexacon (Wat.). These are the first records from this region.

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Authors and Affiliations

Jadwiga Złotorzycka
Maria Modrzejewska
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Abstract

Schistidium urnulaceum (C. Muell.) B. G. Bell, a species hitherto known from the sub-Antarctic island of South Georgia, is reported for the first time from King George Island, South Shetland Islands, in the Antarctic botanical zone. A description of the species together with illustrations, notes on habitat and a distribution map are provided. Taxonomic notes to assist in the identification of S. urnulaceum are also given.

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Ryszard Ochyra
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Abstract

Results of Polish biological investigations and surveys on the state of mackerel icefish (Champsocephalus gunnari Lonnberg, 1905) stock served to undertake an attempt at an independent estimation of some of its biological parameters as well as at the assessment of its biomass and fishing mortality during 1975/76—1991/92 fishing seasons with virtual population analysis (VPA) method (using MAFFVPA programme). Laurec-Shepherd and hybrid methods were applied for the VPA tuning. Von Bertalanffy equation parameters were estimated and compared with those published earlier. F0l and F max values were assessed

using Beverton and Holt model and Thompson and Bell method. Based on data from available literature the coefficient of natural mortality (M) was assumed to be 0.5. VPA results indicate that the total stock biomass (TSB) during the last 1991/92 season amounted to 34,818 tonnes and was approximately 10 times lower than in 1975/76 season. Spawning stock biomass (SSB) declined to a minimum of 7,396 tonnes in 1989/90 season. The assessment results point out to the recruitment as a major factor contributing to the stock fluctuations.

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Authors and Affiliations

Józef Sosiński
Andrzej Paciorkowski
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Abstract

In the summer of 1977/78, materials for determining the age and growth rate of Pseudochaenichthys georgianus Norman, 1937 were obtained in the South Georgia region. The 11—51 cm long fishes were of the age 1+ to 13+. The curvilinear relationship between the body length and the otolith radius took an S shape. In the first four years annual increments are almost identical and start to decrease in the following years. Spawning may occur in the 5th or 6th year of life, and hatching of larvae from eggs laid in autumn (IV—VI) takes place at the end of winter (IX of X). Larvae and juvenile fish lead an exclusively pelagic life, while older fish feed in near-bottom layers: when resources are scare there they seek food in the pelagial.

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Authors and Affiliations

Juliusz Chojnacki
Piotr Palczewski
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Abstract

The paper presents the results of biomass estimates of commercial fishes in the South Georgia region made by "swept area" method on the basis of catch statistics of a B-22 Polish trawler in the 1980/1981 season. Total biomass was estimated on about 11 x 104 t.

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Authors and Affiliations

Mirosław Mucha

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