Otolith-fish length relationships in mesopelagic myctophids from the Southwestern Atlantic Ocean
DOI:
https://doi.org/10.1590/Keywords:
Sagittae, Mesopelagic fishes, Lanternfishes, Otolith-fish body relationships, Linear regressionAbstract
Mesopelagic fishes play a central role in marine carbon export and trophic dynamics, with lanternfishes (Myctophidae) representing one of the most abundant and diverse vertebrate groups in the worldʼs oceans. Despite their ecological significance, quantitative relationships between otolith size and body size remain poorly documented for many mesopelagic taxa, limiting their application in dietary studies and palaeontological reconstructions. In this study, we examined sagittal otoliths from nine Myctophidae species (Ceratoscopelus warmingii, Dasyscopelus obtusirostris, Diaphus dumerilii, D. hudsoni, D. perspicillatus, Hygophum hygomii, Lepidophanes guentheri, Notoscopelus caudispinosus, and N. resplendens) collected along the Southeastern Brazilian continental margin between 1996 and 1999. Otoliths were digitally imaged, and morphometric parameters, including otolith length (OL) and width (OW), were measured to assess their relationship with total length (TL) and standard length (SL) using linear regression analyses. Significant positive correlations were observed between otolith dimensions and fish length for most species. Both OL and OW were reliable predictors of TL and SL, except for L. guentheri and N. resplendens. This study provides new regression data that are likely to greatly facilitate the estimation of myctophid size in dietary and paleontological studies.
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