A brief history of demersal trawling in Southeast Asia (here: Philippines, Thailand Malaysia, and Indonesia) is given. It is argued that this fishery, through its overwhelming emphasis on penaeid shrimps, imported the concept of "trash fish," which had been previously alien in this region, and which still generates considerable unease. In the long term, and for reasons not necessarily related t...

Fisheries management agencies and fishing industry representatives depend on reliable estimates of fish biomass and mortality for the determination of sustainable catch levels. Lack of data or misreporting may be reasons for unreliable stock assessment, which, in turn, may result in advice that does not reflect the availability of fisheries resources. It has been suggested that the mixed pelagi...

Comparative methods are presented which allow for quick and relatively reliable growth parameter estimates when growth data are not at hand. One of these methods involves the use of a newly developed "au ximetric grid.". An empirical equation for the estimation of natural mortality of any fish stock, given a set of growth parameters, is briefly reviewed. . . The methods are applied to data from...

In order to protect and sustainably manage fishery resource species, it is essential to understand their movements and habitat use. To detect the hypothesised migration of maturing veined squid Loligo forbesi from the west coast of Scotland (UK) to the North Sea and identify possible inshore-offshore movements, we analysed seasonal, spatial and environmental patterns in abundance and size distr...

A procedure is proposed by which recruit numbers and parental biomass of shrimps stocks can be derived, given a series of catch-per-effort data and estimates of a few ancillary variables. In the Gulf of Thailand, shrimp recruitment decreased with decreasing egg production, but increased with decreasing total (mainly fish) standing stock. The net result of these counteracting effects was an over...