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Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010

192. (74.) Fahrt des FFS "Anton Dohrn" vom 15.7. - 18.8.1976 Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010

Tagung des ICNAF-Assessments Subcommittee vom 19. bis 27. April 1977 in Dartmouth/KANADA Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010

Composition, abundance and environmental characteristics of the sea-weed resources of Mozambique were investigated along the whole Mozambican sea shore between May, 1979 and November, 1980. The limits of distribution of tropical algae were identified and located close to parallel 21 degree 00'S. Important concentrations of sea-weeds were found in the southern region, but only the Euchema resource in the coast of Cabo Delgado looked promising for commercial exploitation. Biological studies of Euchema were undertaken, the results of which permit the recommendation of a strategy for immediate harvesting which could yield 400-500 tons annually. Further proposals for the culture of sea-weeds are also included.

Este artículo se basa en que las nuevas tecnologías representan una alternativa para la enseñanza y el aprendizaje de las matemáticas; las calculadoras simples, las calculadoras gráficas y las computadoras han ido desplazando a la tiza y a la pizarra, pues los temas pueden ser mostrados con mayor dinamismo y agilidad. Sin embargo, un problema muy común entre los profesores es que cuentan con la tecnología para innovar, pero no saben como hacerlo, en el artículo se sugieren algunas formas de utilizar la tecnología para introducir el concepto de derivada, algunos modos de aproximarla y, por último, cómo obtener reglas generales.

Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010

Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010

Spiny lobsters of the family Palinuridae are known to exist in parts of Asia such as India, Japan, Indonesia and Malaya. In Ceylon spiny lobsters are caught chiefly by a primitive type of gear designed to catch these species and incidentally by nets set to catch fish. The limitations of these types of gear and the results of experimental fishing in Ceylon with different designs of lobster traps have been discussed earlier. As a result of these experiments a very effective trap for capturing spiny lobsters was developed and it was shown that spiny lobsters were present in large quantities (De Bruin 1960). This created great interest among skin-divers who found lobster fishing very remunerative. Department of Fisheries, Fisheries Research Station, Ceylon now incorporated in: National Aquatic Resources Research and Development Agency, Sri Lanka

The fishery products represent one of the most important resources in Vietnam. The paper focuses on distribution, fishing gears, fishing seasons and current use of commercial fish species. Reprinted as: Institut Océanographique de Nha Trang Vietnam, Contribution, nr 79. Full text in French and Vietnamese.

Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010

This paper deals with the dehydration of prawns in a tunnel dryer. Conditions required to produce an end-product of desired colour, shape and texture as well as good reconstitution and organoleptic properties which are not obtained in the normal hot air drying, have been worked out. An initial temperature and relative humidity of 90°C. and 85%-90% respectively and an air velocity not more than 1 metre/second are the essential conditions required. Both temperature and relative humidity are to be reduced to 70°C and 40% respectively after about an hour's operation, till the drying is complete. Flavour of the reconstituted product is close to that of the fresh cooked prawns and the texture is judged to be soft. Drying time required to reduce the moisture content of fresh prawns to 15% level is about 7 hours compared to 6-7 hours in normal hot air drying and more than 36 hours in sun-drying.

Juvenile food and game fish were sampled in all bay areas with 60-foot bag seines; adults were sampled with trammel nets and drag seines. Juvenile redfish, Sciaenops ocellata, were more abundant in 1965 than in 1964 in the Galveston Bay, Matagorda Bay, and Lower Laguna Madre areas, but were less abundant in Corpus Christi Bay and th Upper Lanuna Madre. Juvenile trout, Cynoscion nebulosus, numbers declined in Galveston Bay and the Laguna Madre and were more abundant in Aransas Bay and San Antonio Bay. Juvenile black drum, Pogonias cromis, were less abundant in all areas, while young flounder Paralichthys lethostigma, were generally more abundant. No increases were noted for adult black drum, and there was a decline in most areas. Redfish and trout became more numerous in the fresher water bays (Galveston, Matagorda, San Antonio), but generally decreased along the lower coasts, where sheepshead increased in numbers.

The main results of the institute in 1938 are coverd. The institute's structure for that period is described. Annual financing and accounting are presented. Observations on the commercial fish in the Azov and Black Seas basin, as well as hydrology and plankton surveys are analysed. Published

Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010

Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010

Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010

Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010

The French project "Morest", coordinated by IFREMER, aims to understand the causes of the summer mortalities in Crassostrea gigas. In 2001, three sets of families were bred following a nested half-sib mating design. 17 half-sib families (HSF) were obtained in this first generation (G1) and reared in 3 sites. Significant differences in survival were observed among HSF, and some HSF showed high levels of mortality in all sites, clearly indicating a genetic basis for survival. In 2002, a second generation (G2), including divergent selection and inbred lines, was constituted. Monitoring of survival and growth of G2s were the same as in 2001. Significant differences in survival were found between the offspring of the "high" and "low" selected groups and between inbred lines. The high realized heritability for survival indicates that selective breeding programs could efficiently improve survival of juvenile oysters.

Bi-parental families were produced in hatchery and tested in the field in 2001. Two sets of 5 families were constituted, selected on their high (R) and low (S) survival. These two sets were reared in Brittany from March to November 2002. Samplings were performed twice a month to obtain data on biometry, survival, reproductive cycle, biochemical composition, adenylate energy charge, hemolymph parameters (ions and defense system) and muscle strength. "R" and "S" oysters exhibited different reproductive effort and spawning strategy. "R" oysters allocated less energy in gonad than "S" ones and presented a complete spawning at the end of August contrary to the "S" which spawns partially. Mortality started in July when the seawater temperature reached 19 degree C and affected mainly "S" oysters. Concentrations of Na and Cl ions in hemolymph were different for "S" and "R" from May to June. A bacterial increase in hemolymph (R and S) was observed during the same period. The adenylate energy charge was more lowered for "R" than for "S" oysters, just before the spawning event However, other physiological and immunological parameters were similar between the two sets during the phases of maturation and mortality but discriminated groups after the spawning peak.