But it is a repetitive story and painted in only one colour. To be read if you are trying to get depressed. Another way to criticize whaling is Cachelot where the heros follow a quest over a water planet inhabited by intelligent cetaceans. Refugees from earth that tell stories of historic mistreatments. A simple straightforward story good to read while resting to treat a cold.
Dolphins are also good if one wants to illustrate how evil a great evil empire is.
In Hyperion another space opera book a pastoral planet is invaded by the larger part of humanity in one of the numerous subplots. The dolphins in the subplot who are somewhat un-human complain and are massacred with depth charges. That was some fictitious dolphins, written to show hopes and wishes about how dolphins ought to be or to show how humans behave in fables. This subgenre of science fiction probably contain about 100 books of witch I have found about 23. It is fun to try to understand the biology of real dolphins.