Sea Urchin, Purple Sea Urchin, Rock Sea Urchin

Sea urchins are spiny, globular echinoderms. They lack a centralized brain but possess a complex nervous system. Their spines are used for protection and movement. They have a mouth on the underside and an anus on the top. They play an important role in marine ecosystems by controlling algae growth. Their bodies are largely water and therefore extremely fragile.

Sea urchins are commonly found on rocky seabeds, often attached to rocks or crevices. They prefer areas with moderate currents and good water quality. They're commonly found in intertidal zones and down to depths of 50-100 meters.

Sea urchins begin as larvae, free-swimming plankton. They undergo metamorphosis, developing into the adult, spiny form. They are grazers, feeding on algae and other organic matter. Reproduction is typically sexual, with females releasing eggs and males releasing sperm into the water. They are preyed upon by fish, sea otters, and other marine animals. Sea urchins can reproduce both sexually (releasing eggs and sperm) and asexually (through regeneration of body parts – a severed spine can regrow into a new urchin).

The gonads (often referred to as 'uni') are considered a delicacy in many cultures, particularly in Japan where they are highly prized. They have a creamy, briny flavor. They are often served raw as sushi or sashimi. *Note: Consumption should be done responsibly and sustainably, and from trusted sources to avoid toxins.*