Based on the clue 'aquatic critter of the genus hippocampus', what is the answer?

Based on the clue 'aquarelle is a transparent rather than opaque type...', what is the answer? Based on the clue 'aquarium fish include the fighting fish this one ...', what is the answer? What is referred to by 'aquarius translated from latin'? What is referred to by 'aquarius'? Based on the clue 'aquila chrysaetos is the golden type of this majes...', what is the answer? Which performer is associated with 'aquila'? What is referred to by 'aquiline'? What is referred to by 'ar ar'?