Uwe asked the class what the importance of studying fish behavior was. An exclusive copyright gives all rights of the image to the buyer and does not permit the original owner use of the image. A one production only copyright will sell for less than an exclusive copyright because the buyer has only limited usage but the original owner still owns the image and can sell it again for another use.
Crustaceans see the way humans see.
As we discussed the colorful fish are found mostly in the tropics and not in opened waters and are allowed to be colorful. The fish in opened waters are camouflaged because they have to be, they do not have coral reefs around that they can hide in. The function of aggression is because of territoriality. Aggression is found among species and not between them. Aggression is necessary because of competition of food.