The determination of the growth and exploitation parameters of Liza dumerili is carried out by the length frequency analysis method. Samples are either obtained from landings from the Joal Fadiouth artisanal fishery supplemented by catches made in experimental fishing by a purse seine. The measurements included total length, total weight, eviscerated weight and gonad weight. The data were analyzed by the FISAT II software for biometric analysis which include asymptotic length and growth coefficient (K) among others. For statistical analysis we used Past software for naturalists. The results obtained showed isometric isometry with b = 3. The growth parameters estimated using the von Bertallanfy equation gave the following results for the asymmetric length L∞ = 39.55 cm and a growth coefficient k = 0.37 year-1. According to the methods used, the instantaneous mortality is Z = 2.61an-1, the fishing mortality F = 1.99 yr-1 and the natural mortality M = 0.62 yr-1. Virtual population analysis showed that L. dumerili is overexploited in the area with an exploitation rate E = 0.76. Juveniles are the most affected by fishing pressure. In the management of local fisheries, management measures specific to the species are required.

The objective of this study is to have a real knowledge by locality of dynamics and the propagation mode of the bush fires in time in space. To achieve our goal a methodological approach was adopted by a use on the one hand satellite images and software of SIG for the image processing and on the other hand cards of investigations for the talks, the GPS for the localization of the CVD (Village Committee of Development), of the mowings for the collection of herbaceous biomass and of the compasses for the determination of the transect. This work was supplemented by investigations into the ground and that made it possible to determine on average 10000 hectares which burn each season is to say October to May with reduction (controlled fire) for the period from October at November. The study highlighted on the one hand that late fires intervene in second half of the dry season to reach significant proportions in February and Mars and on the other hand that the occurrences of fire are observed in the South of the district where is the classified field.The estimate of the vegetable biomass is obtained starting from a correlation of the data to the level satelitte to extract the Index from Vegetation by the Standardized Difference (NDVI) of the channels red and near infra-red to the imagery of the year corresponding and the data of ground for the determination of the herbaceous and woody production to the level of the sites of control on the ground. Each more than 60% of the total production of the vegetable biomass disappears under the action of fires.

The objectives of the study were to determine the specific richness and abundance of the fish population of Joal Fadiouth's Protected Marine Area (MPA) in Senegal. To obtain a representative view of the spatial distribution of the fish fauna of the Joal-Fadiouth MPA, we chose to sample at three sites in particular the Gaskel, Church and Mbar Assane stations. Experimental fisheries are conducted between 2014 and 2015 during the four hydrological seasons of each year, including cold (April), cold warm (June), warm (August) and cold (November). Three types of fishing gear, namely a purse seine (ST), an encircling mesh (FME) mesh 12 mm stretched and a longline (P) were used separately from one station to another, each station. It allowed us to identify the different species and their distribution in the MPA. A total of 70 species were recorded between the different experimental fishing stations in both zones. These species are divided into 60 genera belonging to 38 families. The species of Sciaenidae and Carangidae are the most numerous with respectively 9 and 7 species, followed by Sparidae, Clupeidae and Tetraodontidae with 5 species for the first and 3 species for each of the other two.