1. AOAC International (2006a) Protein (crude) in animal feed. In: Horowitz W (ed) Official Methods of Analysis. Association of Official Analytical Chemists Inc., Arlington, pp 30–31
2. AOAC International (2006b) Crude fat in feeds, cereal grains, and forages. In: Horowitz W (ed) Official Methods of Analysis. Association of Official Analytical Chemists Inc., Arlington, pp 40–42
3. AOAC International (2005) Ash of animal feed. In: Horowitz W (ed) Official Methods of Analysis. Association of Official Analytical Chemists Inc., Arlington, p 8
4. Azad AK, Pearce CM, McKinley RS (2011) Effects of diet and temperature on ingestion, absorption, assimilation, gonad yield, and gonad quality of the purple sea urchin (Strongylocentrotus purpuratus). Aquaculture 317:187–196
5. Baiao LF, Rocha F, Costa M, Sa T, Oliveira A, Maia MRG, Fonseca AJM, Pintado M, Valente LMP (2019) Effects of protein and lipid levels in diets for adult sea urchins Paracentrotus lividus (Lamarck, 1816). Aquaculture 506:127–138