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Opisthonema oglinum is one of the most important fish species from an artisanal beach seine fishery that operates on the Campeche Bank. Growth parameters, age structure, seasonal variation of reproduction and diet were studied from October 1986 to December 1987. Estimates of von Bertalanffy growth parameters were: L∝ = 177.5 mm, K = 0.249 year−¹ and t0 = − 1.07 years. Individuals with ripe eggs were found throughout the year, although the proportion was highest from July to December. Sexual maturity in 50% of females and males was attained at a fork length of about 154.8 mm and 151.2 mm, respectively (5 years old). The diet of this herring is mainly benthic micro-crustaceans, but it varies with season, reproductive stage and age. Immature thread herring feed on prey with a lower energy content than that of maturing O. oglinum. Español