effect of density-dependent catchability is well-taken to account for the nature that the required effort level to remove one … highly depend on the degree of asymmetry in migration as well as the sensitivity of catchability in response to a change in …

standard Schaefer-type models that have one innovation: they allow the water hyacinth abundance to affect catchability. We … and on catchability coefficients. The results shows that while fish stocks have fallen since 1990, this decline appears to … have been at least temporarily halted by the declining catchability of fish due to the growing abundance of water hyacinths …

effect of density-dependent catchability is well-taken to account for the nature that required effort level to remove one … highly depend on the degree of asymmetry in migration as well as the sensitivity of catchability in response to a change in …

of catchability in a situation where a series of controlling actions incurs operational costs that derive from the fact … that catchability depends on the current stock size of invasive species. We analytically demonstrate that the optimal … policy sequence can drastically change, depending on the sensitivity of catchability in response to a change in the stock …

catchability coefficients of Gordon-Schaefer or Fox models should also increase over time. We estimated both models using annual … catchability coefficients have decreased significantly over time in all four fisheries. We suggest that one important source of … aggregate annual catch and effort data can introduce spurious trends in annual catch per unit effort, and hence in catchability …

catch, are not directly observable. Simplifying assumptions are generally required, such as the assumption that catchability … imposes a less restrictive pattern (than constancy) on catchability, yet does so in an econometrically acceptable fashion. It …