The best definition for the word devoted as it is used in the first paragraph of this passage would be: D) set apart for a special use .
All the options presented in this question contain a valid definition of the word "devoted". However, we must take the context into consideration before choosing one of them. In this excerpt, the "hooks, rods, flies, and reels" have a specific purpose: they were manufactured to catch unshelled fish. That is because, unlike shell-fish, unshelled fish are much more difficult to catch. Thus, we may conclude that that gear is devoted to catching them - is manufacture and set apart for the special use of catching unshelled fish.