Se capturaron un total de 2 014 individuos con un peso de 10 393.42 g, pertenecientes a 31 especies y 20 familias. Barra de Nexpa registró la mayor riqueza con S= 21 y el mayor porcentaje de especies raras con 22.6%. La especies con mayor abundancia fueron Agonostomus monticola y Mugil curema, mientras que Dormitator latifrons y Lutjanus novemfasciatus registraron la mayor biomasa. La salinidad, temperatura, oxígeno disuelto y transparencia mostraron diferencias significativas por temporadas, influidas por la variación estacional de la precipitación. La composición y especies dominantes fueron distintas en cada sitio y en cada temporada, mientras que la abundancia, biomasa y riqueza no mostraron variación significativa. La comunidad de peces estuvo compuesta por especies marinas y dulceacuícolas que utilizan los estuarios como zonas de crianza, especies marinas que se integran al estuario de manera ocasional y especies estuarinas que forman parte de estos ecosistemas durante la mayor parte de su ciclo de vida.
(Günther, 1862). Values of b ranged from 2.912 to 3.432. The results revealed that length-weight relations for all species were highly correlated; likewise, length-length relations for all fi shes also showed high correlation. This study presents for the fi rst time, length-weight parameters for two species and length-length relations for six species.Keywords: Actinopterygii, ichthyofauna, estuaries, Michoacán, LWR, regression models, Mexico Length-weight relations (LWR) studies are used to predict the mean weight of fi sh when it is not possible to estimate it in fi eld. They are also used to calculate the standing stock biomass, to analyse the ontogenetic changes, and to study other aspects of fi sh population dynamics like growth rates and age structure (Quist et al. 2012). This type of information is not available for fi sh species inhabiting the coastal zone of the state of Michoacán, Mexico. Thus, the goal of this study was to report data of the length-weight (LWR) and standard length-total length (L-L) relations, for 14 fi sh species caught in estuaries from Michoacán (central Mexican Pacifi c).Fish specimens were collected in four estuaries from the south-eastern coast of Michoacán: Barra de Nexpa (18°05′07′′N, 102°47′18′′W), Teolán (18°4′19′′N, 102°43′51′′W), Mexcalhuacán (18°3′16′′N, 102°39′28′′W), and Barra de Pichi (17°58′28′′N, 102°19′33′′W). The fi shes were sampled bimonthly, from February 2010 through February 2011, using beach seines, cast nets, and trammel nets. Fish specimens, were deposited in the Aquatic Biology Laboratory of the Universidad Michoacana de San Nicolás de Hidalgo (UMSNH) to be identifi ed using specialized keys. Standard (SL) and total (TL) lengths were measured to the nearest 1 mm using a digital calliper and weights were determined to the nearest 0.01 g with an electronic balance.LWR was calculated from linear regression:log W = log a + b log SL Table 1, including number of specimens (n), size range, and b values. Estimations revealed that length-weight for all species were highly correlated, with the coeffi cient of determination (r 2 ) ranging from 0.94 to 0.99 (P < 0.001). The most represented family in our study was Eleotridae (three species). It was followed by Mugilidae and Gobiidae (two species each) while the remaining seven families were represented by a single species only (Table 2).Results were compared with those reported in other studies taken place in the Mexican Pacifi c coast (González-Acosta et al. 2004, Rojas-Herrera et al. 2009, Velázquez-Velázquez et al. 2009). Four of 14 LWRs (Lile nigrofasciata, Mugil curema, Lutjanus novemfasciatus, and Eucinostomus currani) and one of L-L relations (E. currani) were not within the expected range. The differences in the expected ranges when compared with the estimates provided by other studies may be due to the variation in the sample sizes and the size ranges. The high number of individuals with small length was because estuaries are used as nurseries for fi shes such as L. nigrofasciata, Agonostomus monticola, M. c...
En la desembocadura del río Coahuayana, al noroeste del estado de Michoacán fue registrada la presencia del plecostoma rayado, Pterygoplichthys disjunctivus (Loricariidae). Se describe e ilustra un ejemplar adulto de sexo indeterminado, con longitud total de 386 mm, recolectado el 4 de julio de 2010.
This study is the first to complete an intensive and comprehensive list of the ichthyofauna of nearly all ecosystems of the Michoacán coast, Mexico. The resulting systematic checklist, supplemented with information from the literature and scientific collections, comprises 440 species belonging to two classes, 31 orders, 104 families, and 264 genera. The families with the highest number of species were Sciaenidae (30 spp.), Carangidae (26), Haemulidae (24), Serranidae (21), Paralichthyidae, and Gobiidae (13). Of the total species list, 134 represent first records for the Michoacán State, and one is a first record for Mexico. The results expand the number of known fish species of the Michoacán coast by almost one third and will help to develop conservation and management plans for this coastal zone.
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