Gosida Dark sea catfish — Wikipedia These differences may be associated with the smaller body sizes, on average, attained by the species of Cathorops. The living marine resources of the Western Central Atlantic. One pair of small, narrow and elongated accessory tooth plates, quite distant from one another. Description of Cathorops mapalea new species of sea catfish Siluriformes: Pectoral-fin spine thick and short; anterior margin without granules or serrations; posterior margin with long and conspicuous serrations along almost its entire length. Lips wide, lower lip thicker than upper lip.

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Del Hueso , Col. Abstract 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 to February a total of 19, specimens were collected using a trawl net at 37 sampling stations along the west coast of Campeche.

The highest mean abundance values were recorded in May 1. The relative condition factor showed a major pulse in July 2. The female:male ratio was Total mortality was 1. Recruitment patterns showed a significant pulse between July and August, which together contributed Key words: Campeche, catfish, Cathorops melanopus, growth, mortality, trophic spectrum. De una submuestra, se midieron y pesaron individualmente 14, organismos. La mortalidad total fue de 1. This activity siete barbas Xiphopenaeus kroyeri Heller En esta Ciencias Marinas, Vol.

El bagre C. This study therefore aimed to: a analyze Galindo-Cortes Estos trabajos coinciden en que C. At each station, dissolved oxygen, pH, salin- una red de 37 sitios de muestreo que cubren los diversos ity, and bottom and surface water temperature were measured ambientes identificados en la zona, considerando aspectos with a Hydrolab H20 probe Hach Co.

Abundance una red de arrastre de 5 m de largo y 2. Sampling stations in the study area. Distribution models were generated for the spatial representation by the Kriging interpolation technique using donde PT es el peso total y LT la longitud total Ricker Surfer software Smith et al.

La mortalidad total se slowest; Sparre and Venema Total mortality was quantified using the talidad total. For y Prejs y Colomine Prejs and Colomine To establish the food preference of C. Las tallas de los organismos oscilaron entre 35 y mm de longi- where F is the frequency percentage, N is the numeric percent- tud total, con una moda en la marca de clase Of these, 14, indi- vias. They had a combined weight Usumacinta y Palizada-Del Este fig.

En octubre y diciem- of El comportamiento ing to the rainy season. The highest abun- primero entre mayo y julio, y el segundo, menor, en diciembre dance values were recorded in October and December, but the fig. Figure 6 shows a discontinuous version of La mortalidad total estimada Z mediante la curva de captura the KDE per size, where a length mode of La mortalidad natural estimada entered into the FiSAT program to search for the parameters mediante el algoritmo de Pauly es de 0.

The best fit was media de Total mortality Z estimated De organismos que fueron seleccionados en forma by the size-converted catch curve was 1. Natural mortality de junio, agosto, octubre, noviembre y diciembre de y estimated by the Pauly algorithm was 0. Spatial model of the density distribution by regional climatic season: a dry season, b rainy season, and c winter storm Nortes season. Figura 2. Finally, the recruitment model revealed claramente el sexo.

Las tallas de los organismos seleccionados a pulse between July and August, with a combined percentage oscilaron entre 43 y mm LT, y se encontraron hembras of De los stages II and VI fig. Temporal pattern of the condition factor of Cathorops melanopus. Figura 5. Time months Figure 3. Temporal pattern of biomass, density, and average weight of Cathorops melanopus.

Figura 3. Figure 6. Figura 6. Estructura de longitud de Cathorops melanopus. Weight-length relationship of Cathorops melanopus. Figura 4. Numerically, amphipods were the best represented lar en los sistemas Palizada-Del Este y Grijalva-Usumacinta trophic group De acuerdo con los modelos de remains 4. The index of relative importance retrasado del incremento en el volumen de la descarga de los Pinkas et al.

Growth lines adjusted to length frequency data, capture curve, and recruitment model of Cathorops melanopus. Figura 7. La presencia de C. Figure 8. Mientras que Figura 8. Nev- El bagre C. According to the spatial distribution models of the abundance, its habitat extends during the dry and winter Nortes seasons and reduces during the rainy season. This pattern is explained by the delayed effect of the increase in river discharges, given the extent of the coastal plain.

Maximum river discharge occurs between October and December, and minimum in May and June. It has been reported that C. This indicates a temporal expansion of its habitat and ability to move and tolerate environmental variations. The relative abundance of C. Regarding the biomass variation ranges, these also increased from 0.

Cathorops melanopus showed a negative allometric growth 2. The mean condition factor was 0. This indicates a better condition of the organ- isms in the inner part of the lagoon, which is understandable given the high availability of food and wide variety of refuge habitats within it. The monthly mean condition factor reflects two important moments for the population during the year, one between May and July and another, although not as major, in December.

It can thus be assumed that Figure 9. Trophic spectrum of Cathorops melanopus. Figura 9. The population consisted of organisms ranging in size from 35 to mm TL, with a mode at La of C. These values are comparable with those y mm de longitud total, con una moda en la marca de clase obtained in the growth model developed here. It is also worth La talla de primera recorded a maximum size of These data are proportionally guatemalensis, H. Para el caso del punto de and amphipods represented At this same site, Vega-Cendejas et al.

Estos datos son propor- observed that polychaetes constituted Because C. Mar 3. Limusa, pp. FAO, Rome, pp. FAO Species identification sheets for fishery la respuesta natural a modificaciones en los patrones de carga purposes. Western Central Atlantic Fishing Area Froese R, Pauly D.

En este sentido esta especie pudiera funcionar como un indica- Galindo-Cortes G. Metropolitana, Unidad Xochimilco, pp. Jaina 11 2 Mar Limnol. Rosenblatt M. Remarks on some nonparametric estimates of a Nikolsky GV. The Ecology of Fishes.


Especie: Cathorops melanopus, Bagre prieto



Species: Cathorops melanopus, Dark sea-catfish


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