This is commonly known as a Long-Horned Cowfish (Lactoria cornuta). Because they are such slow swimmers cowfish are easily caught by hand, making a grunting noise when captured. Their bodies are very stiff, since their scales are fused together to form a solid shell which covers almost the entire body. This one was photographed in about 20 feet of water on a night dive.
To cite this page:
Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2014. The Animal Diversity Web (online). Accessed at http://animaldiversity.org.
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