<p>This paper discusses biology reproductive aspects of the yellow fish <em>G. multiradiatus </em>in the reservoir of Villa Victoria located in the State of Mexico, Mexico. Monthly samplings were carried from November, 2005 to October, 2006. 657 organisms were collected using a baitwell net. The sex ratio of females/males was 2.27:1 (p <0.05) and the size at first maturation for the females was 32 mm of standard length. The spawning season occurred between March and November, corresponding to the highest values of the gonadosomatic index. For the fecundity pattern, only the fecundated eggs and embryos were considered, which were adjusted to potential model (F = 0.0001L<sup>3.331</sup>, p <0.05). The basic biology studies on this species are important because <em>G. multiradiatus</em> is endemic and literature on the species is insufficient.</p>
The sexual maturity, age at first maturation and fecundity in females of the yellow fish Girardinichthys multiradiatus were analyzed in the Huapango reservoir located in the State of Mexico, Mexico. From July 2007 to May 2008 bimonthly samplings were carried out and, using a bait well net, 407 individuals were collected (245 females and 162 males). Overall, the sex ratio between females/males was 1.51:1 (P <0.05). The age of first maturation in the females was 33 mm of standard length. The spawning period occurred in July and accounted for the highest values in the gonadosomatic index. For the fertility model only fertilized eggs and embryos were considered, and those were adjusted to the potential model F=1E-08L 5.6144 (P <0.05). This study contributes to the understanding of the reproductive biology of the yellow fish, which takes place in the reservoirs of the State of Mexico.
The morphology of Diogenidae megalopa collected in the southwestern Gulf of Mexico was analyzed; the characters considered were: number of segments from the flagellum of the antenna, size and shape of the carapace, number of setae of the scaphognathite of the maxilla, abdomen size, size and number of setae of the endopod and exopod of uropods and number of setae in the posterior margin of telson. A total of 4023 megalopae were obtained and eight species were identified: Calcinus tibicen, Clibanarius antillensis, C. vittatus, C. cubensis, Dardanus insignis, Paguristes sericeus, P. spinipes and Petrochirus diogenes. The species of genus Clibanarius are distinguished by the suboval shape of the telson and have less than nine setae in their posterior margin. The difference between Clibanarius species is given by the number of setae on the scaphognathite of the maxilla and the number of segments in the flagellum of the antenna. The scaphognathite of D. insignis and P. diogenes have more than 70 setae; the difference between these two species is the number of setae on exopods of the uropods. The megalopa of P. sericeus presented six segments on the antenna, P. spinipes and C. tibicen have 10 segments, the difference between these two species is that P. spinipes has 26 setae in the scaphognathite and C. tibicen has 65. With a morphological analysis it was possible to structure a key for genus and species identification. These keys are the first contribution for the identification of Diogenidae megalopae in the southwestern Gulf of Mexico.
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