Le gobie Discordipinna filamentosa, pr & eacute;c & eacute;demment connu uniquement du Pacifique nord-ouest (Japon et Malaisie), est signal & eacute; pour la premi & egrave;re fois & agrave; l'ile de Mayotte, sud-ouest de l'oc & eacute;an Indien. Ce nouveau signalement correspond & agrave; une extension de l'aire de r & eacute;partition de l'esp & egrave;ce d'environ 7000 km au sud-ouest de la Malaisie et confirme la pr & eacute;dilection de l'esp & egrave;ce pour la zone m & eacute;sophotique. Cette observation souligne l'importance d'augmenter l'effort de prospection sur les zones peu & eacute;tudi & eacute;es et les habitats r & eacute;cifaux de la zone cr & eacute;pusculaire afin de mieux appr & eacute;hender leur biodiversit & eacute; et leurs fonctionnalit & eacute;s & eacute;cologiques.
The Chiapas killifish (Tlaloc hildebrandi) is an endangered freshwater fish endemic to the highlands of Chiapas, Mexico. This highly restricted species faces ongoing habitat decline and degradation, principally caused by urbanization and pollution, as well as the threat posed by invasive species. The otolith has long been recognized as one of the structures in fish anatomy most useful as a powerful tool for use in fish aging because of its accretionary growth and species-specific shape. The present study analysed annual T. hildebrandi otolith rings, documenting the growth pattern to describe the age and population structure of the species of interest. Otolith analysis revealed that T. hildebrandi range from 0 to 7 years in age, while the frequency distribution of T. hildebrandi length presented seven modes corresponding to seven age classes or cohorts. The length-weight relationship (LWR) equation showed positive-allometric growth (b > 3), with no differences between sexes observed. Additionally, the von Bertalanffy growth equation was expressed as SL: Lt = 142.5(1-e(-0.161(t - 0.264))) and TL: Lt = 169.4 (1-e(-0.155(t - 0.199))). These findings contribute to the understanding of Chiapas killifish age and growth patterns, thus emphasizing the continuous need for research and monitoring to support the management and conservation efforts for this species.
- We describe here for the first time the full mitochondrial genome of two specimens of Pycnochromis nigrurus (Smith, 1960), until recently (Tang et al., 2021) placed in the genus Chromis, a planktivorous fish abundant on coral reef outer slopes in the Indian Ocean, including Reunion Island. The mitochondrial genome is 17,164 bp long and contains 13 protein-coding genes along with 22 tRNA and two rRNA genes and a D-loop region, arranged similarly to other Chrominae species. Distance analyses of complete mitogenomes of representatives of four Pomacentridae genera indicated a closer proximity to the genus Dascyllus, consistent with the last revision of the Pomacentridae by Tang et al. (2021). These mitogenomes are available through GenBank (Accession: OR616239-40).
An annotated and illustrated account of the species of the family Soleidae from the Canary Islands is presented. Solea senegalensis Kaup, 1858 is observed for the first time from this archipelago, bringing the total number of soleid species in the region to five. Erroneous or insufficiently documented records of Soleidae in the Canary Islands are also discussed. The absence of Microchirus hexophthalmus (Bennett, 1831), Solea solea (Linnaeus, 1758), Bathysolea profundicola (Vaillant, 1888), and Dicologlossa cuneata (Moreau, 1881) from the Canaries is confirmed. Additional information on the ecology, biology, and bathymetric distribution of the Canarian species is provided and updated. The study also provides English and Canarian Spanish common names to enhance public awareness and support recognition and conservation of these species.
