Freshwater crayfish are damaging invaders across southern Africa; however, monitoring techniques and efforts disparate the region as different sampling methods have been used. To develop a standard method for assessing redclaw Cherax quadricarinatus abundance, survey was conducted to assess differences in detection catch per unit effort (CPUE) Lake Kariba. Two approaches were compared: opera tr...

Brackish lagoons are highly productive systems that support fishing and aquaculture activities with important revenue. At the same time, they function as fundamental habitats for conservation of a number species use reproduction feeding. The present study aims at describing seasonal structural functional variations fish communities in Fattibello lagoon, small but nursery ground Po River delta (...

The Mozambique Channel region in East Africa has diverse marine ecosystems and serves as a migratory corridor for economically important species. Local foreign industrial fisheries operate the Channel, but regional small-scale are crucially that provide food security, livelihoods, economic opportunities rural coastal communities. This study reconstructed investigated trends fishing effort catch...

Abstract Standardized catch per unit effort (CPUE) is frequently used to represent annual fish-stock abundance trends. In multispecies fisheries, the catchability coefficient differs depending on target strategy. Consideration of strategy in CPUE standardization therefore crucial improving accuracy and precision estimates. This study focuses potential a finite mixture model (FMM), where species...

This paper examines the correlation between biomass and catchability (q) of yellowfin tuna and the NAO index. Biomass estimates are obtained from a biomass dynamic model fitted to catch and cpue for the period 1950-1999. Several assessment scenarios are investigated. Scenarios are defined by the combination of indices used in the biomass dynamic model and the assumptions made about the variance...