If you are looking for gluten sources the maize or rice plants are not good choices. Resources which would be high in gluten would be bread wheats because gluten is the protein used to give good raising ability of wheat based doughs. For your shrimp you will have to experiment which do the best for shrimp reaction by experiment.
Rice gluten meal is the dried residue from rice after the removal of starch, and separation of the bran by the process employed in the wet milling manufacture of rice starch or syrup or glucose. Rice gluten meal has an above average amino acid profile, added vitamins and high protein content. Thus is an excellent option for animal feeds for reducing ration cost, replacing portions of expensive soybean meal, corn and di-calcium phosphate, and hence reducing the feed cost for farmers and feed manufacturers.
It provides livestock with high protein content and is rich in amino acids as compared to soy meal, GNE, Maize etc. Rice gluten is a popular animal feed source and excellent alternate for soy meal which reduces cost production of animal feed by 10 to 20 %. It has high amount of amino acids and proteins and is ideal for livestock having corn and wheat allergies. Rice gluten meal has a higher biological worth than either wheat gluten or corn gluten because of its low cost and great results.