Atlas of marine bony fish otoliths of Southeastern-Southern Brazil Part VIII: Siluriformes (Ariidae) and Pleuronectiformes (Achiridae, Paralichthyidae, Cynoglossidae)

Abstract

To complement the series of manuscripts published as "Atlas of Teleostei Otoliths of the Southeastern-Southern Brazil", in this volume we present results for species of Siluriformes (two species) and Pleuronectiformes (thirteen species) orders. Considering that the sagittae of Siluriformes are very small we analyzed the left lapillus. Due to the asymmetry of the Pleuronectiformes otoliths, were analysed both left and right structures, being the circumsulcal depression the most important feature to diagnose these species. AbstrActDescriptors: Sagittae, Lapilli, Morphology, Morphometry, Siluriformes, Pleuronectiformes.Em complemento à série de manuscritos publicados como "Atlas de Otólitos para os Teleósteos da região Sudeste-Sul do Brasil", neste volume apresentamos os resultados obtidos para espécies das ordens Siluriformes (duas espécies) e Pleuronectiformes (treze espécies). Tendo em vista que os sagittae dos Siluriformes são muito pequenos, foram analisados os lapilli esquerdos. Devido a assimetria dos Pleuronectiformes, foram analisados tanto sagittae esquerdos quanto direitos, sendo a depressão circumsulcal a feição mais importante para diagnosticar as espécies desta ordem.

Otoliths as taxonomic tool to identify catfishes of the genus Mystus (Teleostei: Bagridae) from India

“…Similarly, Ladroit et al (2017) utilised F-value for roundness (117.07), ellipticity (120.286), rectangularity (194.259), form factor (20.256) and circularity (360.67) in stock discrimination of cusk eel. However, F-ratio for roundness (14.58), ellipticity (28.735), form factor (49.223) and circularity (4.154), recorded in the present study were lower than those reported in other species, except rectangularity (30.621) (Ladroit et al, 2017;Santificetur et al, 2017). The difference recorded in otolith morphometric variables among various species (Table 1) may be attributed to the environmental condition, demography (Hoff and Fuiman, 1993;Bostanci et al, 2015), variation in fish growth rate (Campana and Casselman, 1993), food availability and type, niches, river flow, current speed (Vignon and Morat, 2010), biological and behavioural characteristics like swimming activity (Aguirre and Lombarte, 1999) and ontogenetic and genetic factors (Lord et al, 2012;Hussy et al, 2016).…”

“…A significant difference (p<0.05) was observed in the shape indices of the species when ad hoc comparison (Duncan's multiple range test) was applied. Santificetur et al (2017) reported different F-values of circularity (14.07) and rectangularity (0.70) for Genidus barbus and circularity (14.26) and rectangularity (0.69) for Genidus genidus as differentiating traits. Similarly, Ladroit et al (2017) utilised F-value for roundness (117.07), ellipticity (120.286), rectangularity (194.259), form factor (20.256) and circularity (360.67) in stock discrimination of cusk eel.…”

Otoliths morphology and age-record in Bagre panamensis (Siluriformes: Ariidae) inhabiting at the southeast of Gulf of California

“…The descriptions made on Bagre panamensis otoliths correspond to that reported for freshwater catfishes (Martínez & Monasterio de Gonzo, 1988, 1991 and sea catfishes (Volpedo & Echeverría, 2000, Acero & Betancur 2007, Chen et al 2011, Aguilera et al 2013, Santificetur et al 2017, Volpedo et al 2017, in which the lapilli exceed in size the sagitta and asteriscus. The lapilli of the Ariidae is larger than the lapilli found in the Plotosidae, Horabagrus, and Archariidae catfishes (Oliveira et al 2001, Diogo 2005.…”

“…The three pairs of otoliths (lapillus, sagitta, and asteriscus) from 10 individuals were extracted, photographed, and identified in order to describe their external morphology according to Martínez & Monasterio de Gonzo (1991), Volpedo & Echeverría (2000), Acero & Betancur (2007), Chen et al (2011), Aguilera et al (2013), Santificetur et al (2017) and Volpedo et al (2017). Also, these lapilli otoliths were prepared to observe their microstructure using a Tescan MIRA 3 LMU scanning electron microscope; this procedure consisted of embedding the lapillus otolith in resin and cutting them transversely across the core with a circular diamond-tipped blade.…”

Analysis of the 90º and 150º angles for increment counting in otoliths of estuarine catfish

“…In fish from the Ostariophysi superorder, such as ariids, the Lapilli otoliths are the most used in age-estimation studies. These structures are larger and more robust than the sagitta otoliths and, therefore, are preferential for growth and age estimation in these taxa (Assis, 2005;Santificetur et al, 2017). It has already been observed that, in the lapillus otolith, the narrow opaque zones represent slow growth, while the wide hyaline or translucent zones represent rapid growth.…”