3 resultados para German periodicals
em Aquatic Commons
Resumo:
The paper highlighted the overall goal and purpose of the Nigerian German Kainji Lake Fisheries Promotion Project. The main goal is to increase the standard of living of fishing communities in the project area. The target groups are the fishermen and fisherwomen in the area. The project also developed in effective extension delivery system in the basin. Also developed at the project headquarters are facilities for the execution of the project. The project are able to carry out frame, gear and stock assessment surveys on the Lake and able to formulate a fisheries management plan for the fisheries of Kainji Lake
Resumo:
The fetal and larval development of many freshwater fish is already relatively well covered. Coverage of the morphology of fish-species' eggs is very sparse. For this reason the authors have attempted to prepare a key on fish eggs which covers the bulk of German Teleostei fish. The key also includes a discussion of problems of categorization and terminology.
Resumo:
The eel, Anguilla anguilla (L.), stock of the river Elbe severely decreased during the last decades. Detailed knowledge of the stock dynamics in freshwater and especially of the impact factors is necessary to take effective measures for stock conservation and improvement. The dynamics of the eel stock are modelled based on immigration, stocking, natural mortality and mortalities caused by fishing, angling, cormorants and hydropower plants. The model estimates the number of emigrating eel. Moreover, it enables to study the sensitivity of the estimates related to the uncertainty of the source data of the different influencing factors. The model may be used to develop management strategies and to assess the effi ciency of different management options. Zusammenfassung Der Aalbestand im Elbesystem ist in den letzten Jahrzehnten stark zur