Cuetzalán del Progreso, Mexico
Cuetzalán del Progreso, Mexico

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Shell length frequency distribution (SLFD) and sex ratio of a subpopulation of the mangrove cockles Anadara tuberculosa and Anadara similis were analyzed from natural beds in the Cayapas-Mataje Ecological Mangrove Reserve, Ecuador. The SLFD was different between sexes for both species; females were larger than males. Subpopulations of A. tuberculosa and A. similis were dominated by females throughout the year. The overall sex ratio was 2.6:1 (female: male), although with variations in the monthly samples, from 1.2:1 to 5.9:1 in A. tuberculosa and 1.9:1 to 5.3:1 in A. similis. Possibly, these results may be due to differential growth rate between sexes and environmental factors along the year.


Nevarez-Martinez M.O.,Instituto Nacional Of Pesca
Fisheries Research | Year: 2010

We analyzed the catch-at-size data for Dosidicus gigas from the fishing seasons 1996-1997 to 2001-2002. We were interested in alternative methods for stock assessment for this species because of the variability in recruitment and harvest rate. The catch-at-size model (CASA) could be fitted to the catch-at-size data for the different fishing seasons. The CASA model was able to mimic the different size-frequency distributions for jumbo squid. Our estimates of recruitment showed high variability. We estimated the highest recruitment in the time-series to be 8×107 recruits during 1996-1997. During the 1997-1998 fishing season, the recruitment fell to a low level during the 1997-1998 El Niño. We estimated the harvest rate-at-size to be between 0.2 and 0.6 for squid between 30 and 58cm mantle length. The results show that the CASA model can be applied to the available fishery data for the jumbo squid. © 2010 Elsevier B.V.


Juveniles (3.5 ± 0.3 g) of the white shrimp Litopenaeus vannamei were grown during 40 days with no water exchanges, no food addition and four initial densities (25, 50, 75 and 100 g m-3, corresponding to between 8 and 32 shrimp m-2), to determine growth rates, which could be achieved using the periphyton growing on artificial substrates as the only food source. The experimental culture units were 12 polyethylene 1 m3 cylindrical tanks with 4.8 m2 of total submerged surface (bottom and walls), provided with 7.2 m2 of artificial substrate (Aquamats™). There were no significant differences in the ammonia and nitrite concentrations determined in the four treatments (0.17-0.19 and 0.10-0.11 mg L-1, respectively), which remained below the respective levels of concern for shrimp cultures. Mean survival was similar, and ranged from close to 91 to 97%, whereas there were significant differences in mean individual weight, which ranged from 11.9-10.6 g shrimp-1 for the two low initial densities (25 y 50 g m-3), to 8.3-7.7 g shrimp-1 for the other treatments. However, because of the high survival and of the higher initial density, the best biomass yield was with 100 g m-3. The final nitrogen contents of sediment and water were lower than the initial values, and between 36 and 60% of the difference was converted into shrimp biomass.


Wakida-Kusunoki A.T.,Instituto Nacional Of Pesca
Revista de Biologia Marina y Oceanografia | Year: 2015

This paper describes the first record of total albinism in the southern stingray Dasyatis americana. The disc width of the albino sub adult female specimen was 640 mm and the total weight was 9,850 g. It was captured in the coast of Tabasco, southeastern Mexico. © 2015, Universidad de Valparaiso. All rights reserved.


Growth is one of the key processes in the dynamic of exploited resources, since it provides part of the information required for structured population models. Growth of mangrove cockle, Anadara tuberculosa was estimated through length-based methods (ELEFAN I y NSLCA) and using diverse shell length intervals (SLI). The variability of L ∞, k and phi prime (Φ') estimates and the effect of each sample were quantified by jackknife techniques. Results showed the same L ∞ estimates from ELEFAN I and NSLCA across each SLI used, and all L ∞ were within the expected range. On the contrary, k estimates differed between methods. Jackknife estimations uncovered the tendency of ELEFAN I to overestimate k with increases in SLI, and allowed the identification of differences in uncertainty (PE and CV) between both methods. The average values of Φ' derived from NSCLA1.5 and length-age sources were similar and corresponded to ranges reported by other authors. Estimates of L ∞, k and Φ' from NSCLA1.5 were 85.97mm, 0.124/year and 2.953 with jackknife and 86.36mm de L ∞, 0.110/year de k and 2.914 de Φ' without jackknife, respectively. Based on the observed evidence and according to the biology of the species, NSCLA is suggested to be used with jackknife and a SLI of 1.5mm as an ad hoc approach to estimate the growth parameters of mangrove cockle.


Wakida-Kusunoki A.T.,Instituto Nacional Of Pesca | Amador-del-Angel L.E.,Autonomous University of Carmen
Aquatic Invasions | Year: 2011

Cyprinus carpio is known to be established in most of Mexico. Only the Mexican Gulf states were free of this species until recently. This paper reports the first record of the common carp in Tabasco, Mexico. Seven specimens of Cyprinus carpio var. communis and one specimen of Cyprinus carpio var. specularis were detected in a small scale fishing landing site near Frontera, Tabasco on January 24, 2011. Further sampling and monitoring is required to assess the ecological impacts of this exotic species on the native fauna. © 2011 The Author(s).


Schaefer K.M.,Inter American Tropical Tuna Commission | Fuller D.W.,Inter American Tropical Tuna Commission | Aldana G.,Instituto Nacional Of Pesca
Fisheries Oceanography | Year: 2014

The movements, behavior, and habitat utilization of yellowfin tuna, Thunnus albacares, following capture and release with archival tags in the Revillagigedo Islands Archipelago Biosphere Reserve (RIABR), Mexico, are described from analyses of 16 578 days of time-series data, downloaded from 52 archival tags recovered from yellowfin (78-173 cm in length and 1.7-8.0 yr of age) at liberty from 93 to 1773 days (x- = 411 days), collected during 2006-2012. An unscented Kalman filter model with sea-surface temperature measurements integrated (UKFsst) was used to process the archival tag data sets to obtain improved estimates of geographic positions, most probable tracks (MPTs), and movement parameters. The MPTs indicate restricted movements, low levels of dispersion, and fidelity of yellowfin tuna to the RIABR. The median parameter estimates from the UKFsst model for errors in longitude (σx) and latitude (σy) were 0.46° and 1.84°, respectively, for directed movements (u and v) -0.05 NM day-1 and -0.05 NM day-1, respectively, and for dispersive movement (D) 117.99 NM2 day-1. Analyses of daily timed depth and temperature records resulted in the classification of the data into four distinct behaviors. There are significant differences among ages in the durations of Type I and Type II diving behaviors and in the daytime and nighttime vertical habitat utilization distributions. The oceanography surrounding the RIABR appears to have a profound influence on the movements, behavior, and habitat utilization of yellowfin in this area. © 2013 John Wiley & Sons Ltd.


Ourens R.,University of La Coruña | Flores L.,Instituto Nacional Of Pesca | Fernandez L.,University of La Coruña | Freire J.,University of La Coruña
Journal of Sea Research | Year: 2013

We studied the small-scale spatial variability in the growth of Paracentrotus lividus in two populations in Galicia (NW Spain) by reading growth rings. A tetracycline marking experiment was carried out to verify that the rings form annually. The growth rings were read by two independent readers in order to estimate the uncertainty involved in assigning the age. Of the six growth models evaluated (Tanaka, von Bertalanffy, Gompertz, Richards, logistic and Jolicoeur) the Tanaka function obtained the best fit to the data. This function predicts unlimited growth and a maximum growth rate of 15.00 (±0.97 SE) mm·year-1 at 3.09±0.10years old, which progressively decreases at older ages. However, habitat characteristics lead to intrapopulation variations in this general function. Recruitment seems to occur mainly in shallow waters (≤4m) and when the sea urchins reach 50mm (approximately 4years old) they migrate to deeper areas. Sea urchins larger than 50mm that stayed in shallow waters grew at a rate between 0.41 and 0.43mm·year-1 less than the sea urchins that moved to depths of 8 and 12m. The population density also influenced the growth, and individuals older than 4years had higher growth rates in high-density patches than in low-density areas. This could be due to the better environmental conditions in aggregation areas, that is, better protection against waves and predators and/or more abundant food. © 2012 Elsevier B.V..


Wakida-Kusunoki A.T.,Instituto Nacional Of Pesca | Amador-del-Angel L.E.,Autonomous University of Carmen
Revista de Biologia Marina y Oceanografia | Year: 2013

This paper describes the first record of albinism in the gafftopsail catfish, Bagre marinus, on the coast of Tabasco, Mexico. The standard length of the albino specimen was 311 mm and the gutted weight was 962 g. It is not only the first record of albinism of the Bagre genus, but of any kind of fish in the southeastern Gulf of Mexico.


Poot-Salazar A.,CINVESTAV | Poot-Salazar A.,Instituto Nacional Of Pesca | Hernandez-Flores A.,Instituto Nacional Of Pesca | Ardisson P.-L.,CINVESTAV
Scientific Reports | Year: 2014

Age and growth analysis is essential to fisheries management. Indirect methods to calculate growth are widely used; however, length frequency data analysis in sea cucumbers is complicated by high data variability caused by body wall elasticity. Here we calculated Isostichopus badionotus parameters of the von Bertalanffy growth function. In order to address bias produced by body wall elasticity, we compared the performance of four measurements and one compound index that combines different biometric parameters: the square root of the length-width product (SLW). Results showed that variability in length data due to body wall elasticity was controlled by using body length (Le) from the SLW compound index. Growth in I. badionotus follows a negative allometric tendency. Slow or zero growth periods were observed during October and November, when weather conditions were adverse. © 2014 Macmillan Publishers Limited. All rights reserved.

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