An old duality between the fishing effort exerted and the resulting fishing mortality rate, needs some discussion on the proportionality between the 2 variables, since the catchability coefficient cannot usually be assumed constant. This is the argument I make for modelling fisheries, where possible, using mortality rates rather than fishing effort.
in inverse chronological order.
Background document to: Workshop on measurement and standardization of fishing effort. Malaga, Spain, 30-31 May 2006.
J.F. Caddy, Consultant to GFCM.
Some common definitions of fishing effort and its potential use in assessment and management of GFCM resources in the OU context.
Background document to Workshop on measurement and standardization of fishing effort. Malaga, Spain, 30-31 May 2006. J.F. Caddy, Consultant to GFCM.
Indirect approaches to regulation of fishing effort.
Caddy, J. F. (1983). (Abstract) p 6. In: Expert Consultation on the regulation of fishing effort (fishing mortality). Abstracts of papers. FAO Fish. Rep. 289, Suppl 1. P 6.
Some considerations underlying definitions of catchability and fishing effort in shellfish fisheries, and their relevance for stock assessment purposes.
Caddy, J.F. (1979). Fish. Mar. Serv. MS Rep. 1489, 18 pp.
A simple approach for dealing with dynamics and uncertainty in fisheries with heterogeneous resource and effort distribution.
Seijo, J.C., E.P. Perez and J.F. Caddy. (2004). Mar. FW: Res. 55, pp 249-256.
Also in Spatial Issues.