How Can Morphological Characteristics Be Used to Differentiate Species of Rockfish?

Overview

Southern California is a very biodiverse region when it comes to rockfishes of the genus Sebastes, with around 60 species present. Due to low genetic divergence in certain species groups, some are very difficult to tell apart, notably the Greenblotched and Pink Rockfish, Sebastes rosenblatti and Sebastes eos, and the Vermilion and Sunset Rockfish, Sebastes miniatus and Sebastes crocotulus. Morphological characters are often difficult to see in both live and preserved specimens. Fishes were collected by hook-and-line in 2023 at 11 locations, and specimens were identified and studied for additional distinguishing characters. While the latter group could not be properly analyzed due to low sample size, the 34 specimens of the former group yielded promising results. New characters, such as a dark green pigmentation at the pectoral fin base of S. rosenblatti and a notable difference in overall body coloration between both species, were discovered. Both of these characters were consistent in over 60% of individuals of their respective species.

Competition history

• AJAS 2025 Category not listed

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