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Cathorops melanopus is the most abundant fish on the west coast of Campeche, Mexico. Its distribution is influenced by water temperature, salinity, and transparency, and it is frequently found in river outlets. To analyze the main biological and ecological patterns of this species, from February 2003 to February 2004 a total of 19,048 specimens were collected using a trawl net at 37 sampling stations along the west coast of Campeche. A subsample was formed of 14,446 randomly selected specimens, and each one was measured and weighed (length range = 35–302 mm, mode = 90 mm; weight range = 0.1–224 g, mode = 6 g). The highest mean abundance values were recorded in May (1.24 ind m–2, 15.31 g m–2, and 12.26 g ind–1), and the lowest in April (0.25 ind m–2, 2.5 g m–2, and 9.9 g ind–1). The parameters of the weight/length model were a = 1 × 10–5 and b = 2.96, with a correlation coefficient of 0.95. The relative condition factor showed a major pulse in July (2.1 × 10–5). The female:male ratio was 1:0.69. Of the 159 females collected, 111 had gonads at maturity stages II and III, and only one was in stage IV. The most common food item was unidentified organic matter, which represented 79% of the total stomach content weight and 92.1% of the encountered food types; the second most abundant food item was crustacean remains (4.8% of the total weight and 10% of the encountered contents). Growth parameters were: L∞ = 317.5 mm, K = 0.45, C = 0.7, WP = 0.16, and t0 = 7.5 × 10–12. Total mortality was 1.22, while natural mortality was 0.65. Recruitment patterns showed a significant pulse between July and August, which together contributed 47.65% of the total number of specimens collected.   Cathorops melanopus es la especie de pez mas abundante en la region occidental de la costa de Campeche. Su distribucion esta influenciada por la temperatura, la salinidad y la turbidez, mostrando preferencia por las desembocaduras de rios. De febrero de 2003 a febrero de 2004 se recolectaron con una red de arrastre un total de 19,048 organismos en 37 estaciones ubicadas en la porcion occidental de la costa de Campeche. De una submuestra, se midieron y pesaron individualmente 14,446 organismos. La longitud total de los organismos vario entre 35 y 302 mm, con una moda de 90 mm, y un intervalo de peso de 0.1 a 224 g, con una moda de 6 g. La mayor abundancia de organismos se registro en mayo, con valores de 1.24 ind m–2, 15.31 g m–2 y 12.26 g ind–1, y la menor en abril con 0.25 ind m–2, 2.5 g m–2 y 9.9 g ind–1. El modelo peso/talla se integro con los parametros a = 1 × 10–5, b = 2.96 con una correlacion de 0.95. El valor del factor de condicion relativo presenta un pulso mayor en julio de 2.1 × 10–5. La proporcion de sexos hembras:machos fue de 1:0.69. La mayoria de las hembras (111) de un total de 159 se encontraron en las fases II y III y solo una en fase IV. El grupo alimenticio que mas se encontro fue material organico no identificado con 79% de peso y 92.1% de frecuencia, seguido por restos de crustaceos, con 4.8% de peso y 10% de frecuencia. Los parametros de crecimiento encontrados fueron L∞ = 317.5 mm, K = 0.45, C = 0.7, WP = 0.16 y t0 = –0.2163. La mortalidad total fue de 1.22 y la natural de 0.65. El reclutamiento se presenta con un pulso significativo entre julio y agosto con una aportacion conjunta del 47.65%.

Biological and ecological characterization of the catfish Cathorops melanopus off the west coast of Campeche, Mexico