Two males of the cichlid fish Astatotilapia burtoni, the model organism used to study spine and soft-ray development in Hoech et al. (Credit: Joost Woltering) (CN) --- Fins on a fish are used for a ...

As fin spines serve the purpose to make the fish less edible, they offer a strong evolutionary advantage. With over 18.000 members, the spiny-rayed fish are the most species-rich fish lineage.

Scans show that the spine and ribs of Tiktaalik, one of the first fish to crawl on land, had features that are more like those of early land animals than fish By Michael Le Page 20 February 2023 ...