WorldFish is an international, nonprofit research and innovation institution that creates, advances and translates aquatic food systems science into scalable solutions for healthy people and planet. Our research data, evidence and insights shape practices, policies and investment decisions to end hunger and advance sustainable development in low- and middle-income countries. Our publications database contains WorldFish publications and references to WorldFish research published in various journals and periodicals.
A time series of catch and effort data (1970-78) of the Ivorian purse seine fishery in Sierra Leone waters was analyzed using the Schaefer production model. The regression of C/f on effort was significant and the resulting estimates of MSY was 14640 tonnes with F msy=1734 boat days.
Very preliminary bioeconomic assessments are reported in respect to fishery situation in Kenya. In the case of the shrimp fishery, it is concluded that the contemporary trawler fleet is substantially in excess of that required to maximise fishery profits. The second situation concerns the presently unexploited stock of quality demersal species on the North Kenya Bank.
It is proposed that the "recruitment pattern" routine of the ELEFAN II program can be modified to allow, in addition to length-frequency data, the use of "restructured" data files. An example, based on Oreochromis niloticus in Lake Itasy, Madagascar, is given to show that this results in recruitment patterns that have less temporal spread and hence better reflect the actual seasonality of recruitment.