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This selection of methods is based on lecture notes used at a FAO/DANIDA training course held in Mombasa, Kenya, in May-June 1980. The methods presented are: regression and correlation, estimation of growth parameters from length-frequency data, estimation of mortalities (total, natural, fishing mortality) and analysis of catch and effort data. A brief annotated bibliography of tropical fish stock assessment is included.
The problems of controlling fishing effort are reviewed. Any method should satisfy certain criteria - maintaining the productivity of the resource, economic performance and equity (or social needs). The methods of achieving these objectives are reviewed; they include the setting of catch limits, direct control of fleet capacity (e.g. restricting the number of fishing units), indirect measures (mesh size, closed areas), financial measures and the establishment of property rights to fishing areas or quantities of fish. The advantages and disadvantages of each approach are discussed in the light of the established criteria and appropriate techniques are given for six specific types of fisheries.
The genesis of this conference was on a quay of the port of Bergen in March 1985. Ragnar Amason suggested to Phil Neher a small, mid-Atlantic conference on recent developments in fishery management. In the event, more than twenty papers were scheduled and over one hundred and fifty conferees were registered. Logistical complications were sorted through for a summer 1988 conference in Iceland. The really innovative management programs were in the South Pacific; Aus tralia and New Zealand had introduced Individual Transferable Quotas (ITQs); and Iceland, Norway and Canada were also experimenting with quotas. It seemed to the program committee (Rognvaldur Hannesson and Geoffrey Waugh were soon on board) that these quotas had more or less characteristics of property rights. Property rights were also taking other forms in other places (time and area licenses, restrictive licensing of vessels and gear, traditional use rights). The idea of rights based fishing became the theme of the conference.