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VM244: Diagnostic Methods for the Comprehensive Health Assessment of the Long-Spined Sea Urchin, Diadema antillarum

Figure 7. A healthy urchin is shown on the left. Spines are erect, and the animal is firmly attached to the substrate. A moribund animal, or one that has just died, is shown on the right. Spines are flat on the bottom of the tank. It begins to float just off the bottom as it detaches from the substrate.

Credit: R. Francis-Floyd, UF/IFAS