Task: Sentence Expansion
Input (English): The shrimp and the surface mucus layer and eggs of the catfish contain carotenoid pigments which seem to cause the golden colour of the shark .
Output (English): The shrimp and the surface mucus layer and eggs of the catfish contain carotenoid pigments that appear to be the source of the sharks ' golden color ; whether the pigments in the catfish also ultimately come from the shrimp is uncertain .