Fishing tactics and fish abundance, and their influence on catch rates

Influence of environment and fleet dynamics on catch rates of eastern Scotian Shelf cod through the early 1980s

“…The high VIF values in this multiple regression, however, demanded that caution be employed in the interpretation of its parameter values, which may be poorly estimated by these data. Nevertheless, these observations suggest a trade-off between fixed costs (such as travel) and variable costs (such as risk of poor weather or damage) between the two regions similar to expectations of the relationship between distance to port and profitability predicted by economic models in the literature (Lynde, 1981;Sampson, 1991).…”

Modeling performance and information exchange between fishing vessels with artificial neural networks

“…The search preference in fishing grounds closer to port in this model has been described previously in ANN models (Dreyfus-Leon, 1999), in bio-economical model accounting for fishing costs (Sampson, 1991), as well as in real fisheries (Eales and Wilen, 1986;Salas, 2000;Van Oostenbrugge et al, 2001).…”

Functional response of fishers in the Isle of Man scallop fishery

“…Simply using mean fleet CPUE does not provide a good index of abundance, as CPUE may become equalised over fished areas as fishers move to maintain catches (Gillis et al 1993, Gillis 2003. Therefore, it is essential that CPUE is standardised to account for the spatial distribution of the fishing fleet (Sampson 1991). Moreover, fishery-dependent estimates of CPUE may be dependent on the fleet composition at any given time due to variability in fishing efficiency between vessels.…”