Fishing mortality and population size of the spotted sea trout Cynoscion nebulosus (Cuvier) from Holbox, Quintana Roo, Mexico
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Abstract
Estimates of fishing mortality were obtained for the spotted sea trout Cynoscion nebulosus, which is exploited around Holbox Island off the northeast coast of Yucatán. Fishing mortality as a function of length follows the same pattern for the period of 1983 to 1985, showing a tendency to increase with size. Biomass estimates of the average population vary between 47 to 146 tonnes, probably due to differences in accessibility to the stock between years. The weighted average values of fishing mortality (F) and exploitation rate (F/Z) for the whole population vary within the range 0.358 ≤ F ≤ 0.528 and 0.416 ≤ E ≤ 0.512. Consequences of changes in the length at first capture and catch rate are discussed; however, because C. nebulosus is obtained from a multispecies fishery, non-target species should be considered for management purposes.
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