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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 "auximetric 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 the Gulf of Thailand trawl fishery, and the mortality caused by this fishery is estimated.
The following parameter values are derived for a West Kalimantan (West Borneo) stock of the threadfin bream, Nemipterus marginatus : L infinity = 24.5 cm (L.T.), W infinity = 210 g, K = 0.42, t = -0.41 and M = 1.73. Yield-per-recruit for N. marginatus are presented. Catch per hour of N. marginatus is very low, even in the area of highest density ( approximately equals 3.5 kg/h at 45 m depth). Single-species exploitation of a stock of the type represented by N.
A new computer-based method is presented for the "tracing" of growth curves through fish length-frequency samples sequentially arranged in time. The method allows for an objective extraction of growth parameters whenever representative samples are available from a fish population. The method is suited both to the analysis of growth in tropical stocks and in temperate stocks, where growth oscillates seasonally.