Die biologischen Voraussetzungen für einen guten Dorschnachwuchs verbesserten sich 1994 in der westlichen Ostsee

The investigations on the fecundity of cod from different areas of the Baltic Sea started in 1992. The samples were collected in ICES Sub-divisions 25 (Bornholm Sea). 24 (Arkona Sea) and 22 (Mecklenburg and Kiel Bay). This article surnmarizes the results of 435 analysed gonads from females of age groups 1 to 8 with total length of 24 - 116 cm of the years 1992 to 1995. The gonads were prepared and analysed according to the methods which were deseribed in Bleil and Oeberst (1993). The aim of the investigations is to estimate the reproduction potential of cod for different areas and years. For this reason the absolute and relative fecundity were analysed for estimating the dependence on the total length, for age groups and the weight of females. These data were estimated for the populations Gadus morhua morhua and Gadus morhua callarias. Preliminary results have shown that the absolute fecundity (fabs) is dependent on whole weight of the females. The influence of sub-divisions (SD) and years to the fecundity are very low. Additional to this data was calculated the population fecundity for the western Baltic Sea stock (SD 22 and 24). The numbers of produced ripe eggs within the western Baltic were estimated with 4055.59 x 10(9) for 1993 and 6949.85 x 10(9) for 1994.

Deutsche Rotbarschfischerei im NW-Atlantik (Reykjanes Rücken - Irminger See - Ostgrönlandschelf) in den Jahren 1993 und 1994 und ihre möglichen Zukunftsaussichten

Die Rotbarschfänge der deutschen Hochseefischerei in der Irminger See (ICES Gebiet XII und XIV) weisen in den beiden letzten Jahren, verglichen mit anderen kommerziellen Arten ( z.B. Kabeljau) hohe Steigerungsraten auf. Sie sind einerseits durch die Wiedervereinigung (Eingliederung der damaligen Rostocker Hochseefischerei in die BRD-Flotte), anderseits durch Fangsteigerungen der DFFU (Deutsche Fisch-Fang-Union) auf den historischen Fanggründen des Ostgrönlandschelf bedingt. Über diese Fischereien, sowie über ihre Zukunftsaussichten, soll im Folgenden berichtet werden.

1994: Optimismus nur für den Nordseesprottenbestand

The new German R.V. "Walther Herwig III" joined the International North Sea Bottom Trawl Survey (IBTS) coordinated in the frame or ICES from February 18 to March 22 1994. A total of 354 valid half hour tows were made by seven research vessels from the different ICES members in order to determine the strength of incoming year classes of commercially most important fish species. Preliminary index figures for the stocks under observation of all participating vessels show that only the North Sea sprat stock developed a substantial year class in 1993. In addition, hydrographic data were collected during the survey. These data show the temperatures and salinities of the northern and central North Sea in most parts beneath the mean values during the period under investigation.

Auswirkungen der Salzeinströme 1993/1994 auf die ozeanographischen Bedingungen in der zentralen Ostsee

The effects of both the major Baltic inflow in January 1993 and two smaller inflows in December 1993 and March 1994 on the environnmental conditions in the Bornholm, Gdansk and eastern Gotland Basins are described. These inflows terminated the 16-year stagnation of the central Baltic deepwater and led to a moderate increase in salinity, but to the highest oxygen concentrations in the Gotland Deep since the 30ies.

Development and collapse of an Oscillatoria bloom in Loch Leven during July 1994

During 1994, weekly spot-sampling of open water sites on Loch Leven took place from 16th March onwards. Very little difference between spot-sampling sites was observed from 16th March to 5th July. Throughout April and May there was a slow increase in levels of chlorophyll-a, followed by a rapid increase through June, reaching a maximum of 230 micrograms per litre. On 8th July there was a very rapid rise in water temperature, with a corresponding increase in dissolved oxygen and pH. At 0915 hours on 9th July there was a drop in all three variables. These changes were coincident with a marked reduction in chlorophyll-a values falling to 70 micrograms per litre on 12th July. On 16th July evidence of a resurgence of photosynthesis was observed.

Report of the Inter-American Tropical Tuna Commission for the year 1994

ENGLISH: The Inter-American Tropical Tuna Commission (IATTC) operates under the authority and direction of a convention originally entered into by Costa Rica and the United States. The convention, which came into force in 1950, is open to adherence by other governments whose nationals fish for tropical tunas and tuna-like species in the eastern Pacific Ocean. Under this provision Panama adhered in 1953, Ecuador in 1961, Mexico in 1964, Canada in 1968, Japan in 1970, France and Nicaragua in 1973, Vanuatu in 1990, and Venezuela in 1992. Ecuador withdrew from the IATTC in 1968, Mexico in 1978, and Canada in 1984. The Commission held its 53rd meeting in Cumaná, Venezuela, on June 7-8, 1994. SPANISH: La Comisión Interamericana del Atún Tropical (CIAT) funciona bajo la autoridad ydirección de un convenio suscrito originalmente por Costa Rica y los Estados Unidos de América. El convenio, vigente desde 1950, está abierto a la afiliación de cualquier país cuyos ciudadanos pesquen atunes tropicales y especies afines en el Océano Pacífico oriental. Bajo esta estipulación, la República de Panamá seafilióen 1953, Ecuadoren 1961, México en 1964, Canadáen 1968,Japónen 1970, FranciayNicaragua en 1973, Vanuatu en 1990, y Venezuela en 1992. Ecuador se retiró de la CIAT en 1968, México en 1978, y Canadá en 1984. La Comisión celebró su 53a reunión en Cumaná (Venezuela) el 7 y 8 de junio de 1994. (PDF contains 296 pages.)